Our colleagues communicate with many customers face to face and get orders.
If you want,don't hesitate,we wait for your still:(Booth No:226-4).
2016年11月28日星期一
Expo Oil and Gas Colombia 2016 is opening
Expo Oil and Gas Colombia 2016 is opening.
Our colleagues communicate with many customers face to face and get orders.
If you want,don't hesitate,we wait for your still:(Booth No:226-4).
Our colleagues communicate with many customers face to face and get orders.
If you want,don't hesitate,we wait for your still:(Booth No:226-4).
2016年11月27日星期日
Forms and Characteristics of Truss Structural Steel Pipe
Truss structural steel pipe is the important one kind of steel structure, it is a truss structure in the form of a structure composed of steel pipe materials, also known as the steel girder structure, pipe truss and structure, etc. Due to the stronger adaptability, in recent years has been widely used in large-span spatial structure. Pipe truss structure system of plane or space truss structure, and the difference between general truss connecting nodes in a different way: space truss structure with bolt ball or hollow node. Roof truss of the past are often USES plate type node, and pipe truss structure in the node using the direct welding rods are node (or nodes). In the nozzle-vessel junction node, only on the same axis by two executives. The rest of the bar (branch) by the curve ends after processing, direct welding in linking bar (the head) not well versed in the appearance of bar in the node area may have certain gap (gap type node), may also overlap (overlapping nodes). Nozzle-vessel junction wire-cutting manufacturing process has been seen as more difficult. Because intersection in the number of steel pipe, Angle and size of the curve has different forms, and groove processing difficult. But with the development of multi-dimensional numerical control cutting technology. These difficulties have been overcome. At present domestic some enterprise equipped with the technology, pipe truss structure are nodes in the application of the construction of large span unprecedented.
(1) the classification of pipe truss. According to the mechanical characteristics and layout of the bar is different, can be divided into flat pipe truss structure and spatial truss structure. Plane of top chord and bottom chord of pipe truss structure and CHS in the same plane, out-of-plane stiffness is poorer. General need through the lateral support guarantee the lateral stability of the structure. In existing tube truss structure engineering, with Warren truss and Pratt truss forms, Warren truss is generally the most economical arrangement, compared with Pratt truss Warren truss only half its number of CHS and node, and diagonal cutting length is unified, which can greatly save material and processing time. Vierendeel truss is mainly used in building, function or use of the function is not allow to support the diagonal of the situation, spatial pipe truss structure is usually triangular cross section, compared with the planar truss structure, it can has a large span, good stability, and triangle truss torsional rigidity is big and beautiful. Decorate in the don't or can't decorated surface outside support, triangle truss can provide larger span space. A set of triangle truss is similar to a space rigid frame structure, and more economical. Can reduce the lateral support components and improve the lateral stability and torsional rigidity. For small span structure, can not decorate lateral support.
(2) the cross-section form of fittings. Commonly used form of bar section for circle, rectangle, square, etc. Line connection components of different cross section can be divided into the following several kinds of truss forms: C: C type truss chord and are circular tube are CHS truss structure; R - R type truss: namely, chord and CHS are square steel tube or rectangular tubes are of truss structures; R - c type truss: rectangular section chord with circular cross section direct penetration welding of CHS truss structure.
(3) the advantages of pipe truss. With the development of large public buildings, more and more high to the requirement of structure and span of space, space steel truss with the stable properties and good bearing has been widely used. Spatial mild steel pipe truss structure form in accordance with the truss section form can be divided into triangular space truss, quadrilateral space truss, polygonal space truss and variable cross-section space truss, etc. Steel structure because of its beautiful appearance, reasonable mechanical characteristics and superior economy, in the modern industrial workshop, warehouse, gymnasium, exhibition hall, the venue, terminal, railway stations and office buildings, commerce-residence building, hotel, etc has been widely used in construction.
The Application of Structural Steel Pipe in Construction Structure
The application of structural steel pipe in construction structure
In recent years, the steel structure in Marine engineering, not only has been widely used in bridge engineering, and has been used increasingly in industrial and civil construction, steel structure in our country, building structure, the application of more and more, such as used in the third phase of baosteel pipe truss, jilin skating practice pavilion, Harbin ice and snow exhibition center, Shanghai Oriental pearl TV tower and changchun nanling ten thousand stadium adopts square steel tube as the main structural components. In the field of public building, steel structure of the unique structure emerge in endlessly, such as water sports center in Sydney, the United States and dengue roaf crystal church; Single field of large space building, in addition to continue to widely used in supermarkets, warehouse and warehouse, also appeared some very large structures, such as Singapore chapter here airport hangar, Osaka international airport lounge; Another light large-span structure, such as pedestrian bridge and the crane structural mild steel pipe; Other special use structure, such as antenna masts and space launchers.
2016年11月25日星期五
Preheating Process of DSAW Steel Pipe
Preheating DSAW steel pipe external coating process essential step, there are two general equipment selection, that is, gas heating type and frequency heating type.
Pipe treatment of the surfaces: Combustible gas type preheating furnace to burn the outer surface of the tube is likely stick a small amount of dye grunge, grunge to play a role.
Flayer: Using skin effect frequency heating of the scrap steel through an intermediate frequency coil, steel surface coating can be quickly softened Flayer convenient.
Equipment costs: equipment costs not much comparable, but the overall cost is higher than the intermediate frequency furnace gas furnace of LSAW steel pipe.
Environmental protection: gas heating general use of green fuel gas; and frequency heating uses electricity during operation will produce harsh noise, at the same time, if not better frequency power supply pretreatment, intermediate frequency power supply but also on the odd harmonics grid pollution.
If you would like to know more about coating steel pipe,pls contact us:www.great-pipe.com
Processing Techniques of Large Diameter LSAW Steel Pipe
Processing techniques of large-diameter LSAW steel pipe:
① Thread processing steel wire head large diameter pipe, tooth shape, pitch and so it is necessary to link up with the sleeve-shaped teeth, pitch together, and by supporting the gauge view qualified.
② When processing steel thread should be used in water-soluble cutting fluid lubrication; when the temperature is below 0 ℃, should be incorporated into the 15% -20% of large diameter pipe sodium nitrite, do not use oil lubrication fluid or without lubricating fluid threading.
③ Each operator should view the appearance of quality steel wire head and make the operator symbol.
④ Self-qualified by the head of steel wire, each standard response processing capacity of large diameter pipe, Jiangsu random sampling of 10%, and not less than 10, if a failure that the batch processing of the full view, he failed wire head should be re-processed after passing through the inspection can use it again.
⑤ Silk has been the identification of eligible head wear should be preserved to maintain the cap, according to the standard classification of regular stand-by.
If you would like to know more information about LSAW or DSAW steel pipe,pls contact Hunan Great Steel Pipe Co,ltd.
① Thread processing steel wire head large diameter pipe, tooth shape, pitch and so it is necessary to link up with the sleeve-shaped teeth, pitch together, and by supporting the gauge view qualified.
② When processing steel thread should be used in water-soluble cutting fluid lubrication; when the temperature is below 0 ℃, should be incorporated into the 15% -20% of large diameter pipe sodium nitrite, do not use oil lubrication fluid or without lubricating fluid threading.
③ Each operator should view the appearance of quality steel wire head and make the operator symbol.
④ Self-qualified by the head of steel wire, each standard response processing capacity of large diameter pipe, Jiangsu random sampling of 10%, and not less than 10, if a failure that the batch processing of the full view, he failed wire head should be re-processed after passing through the inspection can use it again.
⑤ Silk has been the identification of eligible head wear should be preserved to maintain the cap, according to the standard classification of regular stand-by.
If you would like to know more information about LSAW or DSAW steel pipe,pls contact Hunan Great Steel Pipe Co,ltd.
Iron and steel industry prices fell, what is the reason?
As we all know, often drop large iron and steel industry, the price is extremely unstable, so what is the cause of this phenomenon?Shinestar Steel Research Institute found through research, technology and the characteristics of the iron and steel industry, the cost structure resulted in the imbalance between supply and demand environment quantity adjustment special difficulties.
Specifically, the characteristics of modern steel production technology determines that the industry has a strong scale effect.This means that the iron and steel enterprises need to spend a huge amount of money to buy equipment and equipment to build production systems, resulting in a higher proportion of fixed capital amortization of depreciation in the total cost.Shinestar Steel Group attaches great importance to R & D investment, its R & D production of carbon steel pipe, welded steel pipe, line pipe, galvanized pipe and other excellent products, the market was highly recognized.
Under normal market conditions, the characteristics of the industry makes the steel enterprises with the average cost per unit of output with the output scale and reduce the advantages, is conducive to enhancing the competitiveness of enterprises by expanding the scale, so the rapid growth in market demand under the environment of enterprises with strong expansion impulse.However, the demand for reverse change and under the conditions of excess capacity, the objective needs of sales compensation huge cost sharing, will lead to reduced production enterprises facing special difficulties,makes an ordinary enterprise may have to accept the price is far below the average cost, the formation of the iron and steel industry seems to be more willing to price competition and regardless of the loss of the phenomenon.
Specifically, the characteristics of modern steel production technology determines that the industry has a strong scale effect.This means that the iron and steel enterprises need to spend a huge amount of money to buy equipment and equipment to build production systems, resulting in a higher proportion of fixed capital amortization of depreciation in the total cost.Shinestar Steel Group attaches great importance to R & D investment, its R & D production of carbon steel pipe, welded steel pipe, line pipe, galvanized pipe and other excellent products, the market was highly recognized.
Under normal market conditions, the characteristics of the industry makes the steel enterprises with the average cost per unit of output with the output scale and reduce the advantages, is conducive to enhancing the competitiveness of enterprises by expanding the scale, so the rapid growth in market demand under the environment of enterprises with strong expansion impulse.However, the demand for reverse change and under the conditions of excess capacity, the objective needs of sales compensation huge cost sharing, will lead to reduced production enterprises facing special difficulties,makes an ordinary enterprise may have to accept the price is far below the average cost, the formation of the iron and steel industry seems to be more willing to price competition and regardless of the loss of the phenomenon.
DSAW Steel Pipe
DSAW Steel Pipe is one kind of welded steel pipe. Generally ,it include LSAW Steel Pipe and SSAW steel pipe.
It's the abbreviations of Double Sized Longitudinal arc welding steel pipe. Often used in construction ,transporting Liquid include water, oil and other.
Hunan great steel pipe co.,ltd would like to supply good quality with competitive price for you.
Hunan great steel pipe co.,ltd would like to supply good quality with competitive price for you.
2016年11月24日星期四
Applications and Technical of Black Steel Pipe
Black steel pipe’s strength makes it ideal for transporting water and gas in rural and urban areas and for conduits that protect electrical wiring and for delivering high pressure steam and air. The oil and petroleum industries use black steel pipe for moving large quantities of oil through remote areas. This is beneficial, since black carbon steel pipe requires very little maintenance. Other uses for black steel pipes include gas distribution inside and outside homes, water wells and sewage systems. Black steel pipes are never used for transporting potable water.
Modern Techniques of black steel pipe
Scientific advancement has greatly improved on the butt-weld method of pipe making invented by Whitehouse. His technique is still the primary method used in making pipes, but modern manufacturing equipment that can produce extremely high temperatures and pressure has made pipe making far more efficient. Depending upon its diameter, some processes can produce welded steel pipe at the incredible rate of 1,100 feet per minute. Along with this tremendous increase in the rate of production of DSAW steel pipe came improvements in the quality of the final product.
Modern Techniques of black steel pipe
Scientific advancement has greatly improved on the butt-weld method of pipe making invented by Whitehouse. His technique is still the primary method used in making pipes, but modern manufacturing equipment that can produce extremely high temperatures and pressure has made pipe making far more efficient. Depending upon its diameter, some processes can produce welded steel pipe at the incredible rate of 1,100 feet per minute. Along with this tremendous increase in the rate of production of DSAW steel pipe came improvements in the quality of the final product.
Hunan Great Steel Pipe Co.,Ltd will attend Expo Oil and Gas Colombia 2016
Our Main products include: LSAW steel pipe,ERW steel pipe, ,seamless steel pipe, SSAW steel pipe and all kinds of carbon steel pipe.
More information about us,pls visit: www.hunantube.com.
2016年11月23日星期三
Black steel pipe, non-galvanized steel pipe
Black steel pipe is a non-galvanized steel pipe. Black steel pipe is used in applications that do not require the pipe to be galvanized. This non galvanized black steel pipe acquired its name because of its dark coloured iron oxide coating on its surface. Because of the strength of black steel pipe it is used for transporting gas and water to rural areas and for conduits that protect electrical wiring and deliver high pressure steam and air. The oil field industry also uses black pipes for piping large quantities of oil through remote areas.
Black steel pipes and tubes can be cut and threaded to fit your project. Fittings for this type of pipe are of black malleable (soft) cast iron. They connected by screwing onto the threaded pipe, after applying a small amount of pipe joint compound on the threads. Larger diameter pipe is welded on rather than threaded. Black steel pipe is cut either with a heavy-duty tube cutter, cut-off saw or by a hacksaw. You can also get Mild Steel ERW Black Pipes that are extensively used for gas distribution inside & outside of the home, and for hot water circulation in boiler systems. Can also be used in usage in potable water or drains waste or vent lines. Please browse our construction pipe and tube directory for a supplier to meet your needs.
History of black steel pipe
William Murdock made the breakthrough leading to the modern process of pipe welding. In 1815 he invented a coal burning lamp system and wanted to make it available to all of London. Using barrels from discarded muskets he formed a continuous pipe delivering the coal gas to the lamps. In 1824 James Russell patented a method for making metal tubes that was fast and inexpensive. He joined the ends of flat iron pieces together to make a tube then welded the joints with heat. In 1825 Comelius Whitehouse developed the “butt-weld” process, the basis for modern pipe making.
Developments of black carbon steel pipe
Whitehouse’s method was improved upon in 1911 by John Moon. His technique allowed manufacturers to create continuous streams of pipe. He built machinery that employed his technique and many manufacturing plants adopted it. Then the need arose for seamless metal pipes. Seamless pipe was initially formed by drilling a hole through the center of a cylinder. However, it was difficult to drill holes with the precision needed to ensure uniformity in wall thickness. An 1888 improvement allowed for greater efficiency by casting the billet around a fire-proof brick core. After cooling, the brick was removed, leaving a hole in the middle.
Applications of black steel pipe
Black steel pipe’s strength makes it ideal for transporting water and gas in rural and urban areas and for conduits that protect electrical wiring and for delivering high pressure steam and air. The oil and petroleum industries use black steel pipe for moving large quantities of oil through remote areas. This is beneficial, since black steel pipe requires very little maintenance. Other uses for black mild steel pipe include gas distribution inside and outside homes, water wells and sewage systems. Black steel pipes are never used for transporting potable water.
Modern Techniques of black steel pipe
Scientific advancement has greatly improved on the butt-weld method of pipe making invented by Whitehouse. His technique is still the primary method used in making pipes, but modern manufacturing equipment that can produce extremely high temperatures and pressure has made pipe making far more efficient. Depending upon its diameter, some processes can produce welded seam pipe at the incredible rate of 1,100 feet per minute. Along with this tremendous increase in the rate of production of steel pipes came improvements in the quality of the final product.
Quality Control of black steel pipe such as LSAW steel pipe:
The development of modern manufacturing equipment and inventions in electronics allowed for marked increases in efficiency and quality control. Modern manufacturers employ special X-ray gauges to ensure uniformity in wall thickness. The strength of the pipe is tested with a machine that fills the pipe with water under high pressure to make sure the pipe holds. Pipes that fail are scrapped.
Black steel pipes and tubes can be cut and threaded to fit your project. Fittings for this type of pipe are of black malleable (soft) cast iron. They connected by screwing onto the threaded pipe, after applying a small amount of pipe joint compound on the threads. Larger diameter pipe is welded on rather than threaded. Black steel pipe is cut either with a heavy-duty tube cutter, cut-off saw or by a hacksaw. You can also get Mild Steel ERW Black Pipes that are extensively used for gas distribution inside & outside of the home, and for hot water circulation in boiler systems. Can also be used in usage in potable water or drains waste or vent lines. Please browse our construction pipe and tube directory for a supplier to meet your needs.
History of black steel pipe
William Murdock made the breakthrough leading to the modern process of pipe welding. In 1815 he invented a coal burning lamp system and wanted to make it available to all of London. Using barrels from discarded muskets he formed a continuous pipe delivering the coal gas to the lamps. In 1824 James Russell patented a method for making metal tubes that was fast and inexpensive. He joined the ends of flat iron pieces together to make a tube then welded the joints with heat. In 1825 Comelius Whitehouse developed the “butt-weld” process, the basis for modern pipe making.
Developments of black carbon steel pipe
Whitehouse’s method was improved upon in 1911 by John Moon. His technique allowed manufacturers to create continuous streams of pipe. He built machinery that employed his technique and many manufacturing plants adopted it. Then the need arose for seamless metal pipes. Seamless pipe was initially formed by drilling a hole through the center of a cylinder. However, it was difficult to drill holes with the precision needed to ensure uniformity in wall thickness. An 1888 improvement allowed for greater efficiency by casting the billet around a fire-proof brick core. After cooling, the brick was removed, leaving a hole in the middle.
Applications of black steel pipe
Black steel pipe’s strength makes it ideal for transporting water and gas in rural and urban areas and for conduits that protect electrical wiring and for delivering high pressure steam and air. The oil and petroleum industries use black steel pipe for moving large quantities of oil through remote areas. This is beneficial, since black steel pipe requires very little maintenance. Other uses for black mild steel pipe include gas distribution inside and outside homes, water wells and sewage systems. Black steel pipes are never used for transporting potable water.
Modern Techniques of black steel pipe
Scientific advancement has greatly improved on the butt-weld method of pipe making invented by Whitehouse. His technique is still the primary method used in making pipes, but modern manufacturing equipment that can produce extremely high temperatures and pressure has made pipe making far more efficient. Depending upon its diameter, some processes can produce welded seam pipe at the incredible rate of 1,100 feet per minute. Along with this tremendous increase in the rate of production of steel pipes came improvements in the quality of the final product.
Quality Control of black steel pipe such as LSAW steel pipe:
The development of modern manufacturing equipment and inventions in electronics allowed for marked increases in efficiency and quality control. Modern manufacturers employ special X-ray gauges to ensure uniformity in wall thickness. The strength of the pipe is tested with a machine that fills the pipe with water under high pressure to make sure the pipe holds. Pipes that fail are scrapped.
Type of anti-corrosion steel pipe
Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe.Anti layer structure
Anti layer structure
Anti-corrosion steel pipe in the country is mainly used for petroleum, chemical, gas, heat, sewage treatment, water, bridges, carbon steel pipe and other engineering fields.anti-corrosion steel pipe is divided into the following categories:
IPN8710 corrosion
When the corrosion of steel in more types of media, such as acids, alkalis, salts, oxidants and water vapor, etc., the coating must be chemically inert, acid salt corrosion, the coating should be compact structure, water permeability, adhesion, tough fullness. Such cases for IPN8710 corrosion.
IPN8710 anti-corrosion primer: from polyurethane, polyethylene, modified epoxy resin, non-toxic anti-corrosion pigments, additives and other components, room temperature curing to form interpenetrating networks, dense coating structure, acid, alkali, salt, rust performance, strong adhesion for water supply pipeline wall corrosion primer paint. IPN8710 anti-corrosion finish: from the epoxy, rubber, resin-modified, non-toxic anti-corrosion pigments, additives and other components. Excellent chemical resistance, non-toxic, anti-microbial corrosion, corrosion protection for water supply pipeline wall finish.
FBE epoxy powder corrosion
FBE epoxy powder anti-corrosion structure: electrostatic spraying the surface of the steel epoxy powder coating, a film. The coating has a coating operation is simple, clean, coating impact resistance and bending properties, temperature resistance advantages.
2PE/3PE corrosion
2PE/3PE corrosion structure: the surface of the steel and epoxy powder electrostatic spraying adhesive side wound, lateral wound polyethylene coating, combined with the excellent performance of the three, thus significantly improving the overall quality of pipeline corrosion. Resistant to chemical corrosion, resistance to cathodic disbondment resistance, mechanical damage to properties.
Coal tar epoxy anticorrosive of Hunan Great Steel Pipe Co.,ltd:
Coal tar epoxy anticorrosive structure: from the epoxy resin + filler made of coal tar pitch + anti-corrosion coatings on steel surface coated with glass cloth to strengthen the formation of a coating, commonly used in the pipe wall corrosion. Thickness of 0.5 ~ 1.0mm.
High-density polyethylene jacket corrosion
High density polyethylene jacket corrosion structure: the outer surface of pipe wrapped in high-density polyethylene material, with a high mechanical strength and excellent corrosion resistance, can protect the steel in the transportation, installation and use of the process to avoid external factors the damage.
Manufacture of stent should be added antioxidants, UV stabilizers and carbon black, etc. Polyethylene jacket tube easy to aging, such as open storage tarpaulin and other items appropriate to cover, dumps should stay away from high heat and fire, anti-corrosion coating steel pipe made after the ban exposure, sudden cold, or polyethylene jacket tube easy to crack, the impact product performance and service life.
Processing standard:
1.The petroleum natural gas uses three polyethylene (3PE) Steel pipe anticorrosion
Standard: SY/T0413-2002\DIN30670-1999
2. fluming water, oil, gas Medium and so on use two, three polypropylene (PP) anticorrosion
Standard: DEP 31.40.30.31
3. The petroleum natural gas uses FBE(Single-layer nodulizing epoxy powder anticorrosion) 2FBE(Double-decked nodulizing epoxy powder anticorrosion)
Standard: SY/T0315-2005；Q/CNPC38—2002
4. In the liquid epoxy coating guards against corrosion the steel pipe to be suitable for transportation crude oil, water, natural gas medium and so on
Standard: SY/T0457—2000
5. 8701 tap water antiseptic paint mainly uses in drinking the water conduct, the vessel, its hygienic target achieves tap water Q/12TG3663-2006
6. Epoxy coal tar winding glass cloth mild steel pipe anticorrosion
Standard: SY/T0447-96
Anti layer structure
Anti-corrosion steel pipe in the country is mainly used for petroleum, chemical, gas, heat, sewage treatment, water, bridges, carbon steel pipe and other engineering fields.anti-corrosion steel pipe is divided into the following categories:
IPN8710 corrosion
When the corrosion of steel in more types of media, such as acids, alkalis, salts, oxidants and water vapor, etc., the coating must be chemically inert, acid salt corrosion, the coating should be compact structure, water permeability, adhesion, tough fullness. Such cases for IPN8710 corrosion.
IPN8710 anti-corrosion primer: from polyurethane, polyethylene, modified epoxy resin, non-toxic anti-corrosion pigments, additives and other components, room temperature curing to form interpenetrating networks, dense coating structure, acid, alkali, salt, rust performance, strong adhesion for water supply pipeline wall corrosion primer paint. IPN8710 anti-corrosion finish: from the epoxy, rubber, resin-modified, non-toxic anti-corrosion pigments, additives and other components. Excellent chemical resistance, non-toxic, anti-microbial corrosion, corrosion protection for water supply pipeline wall finish.
FBE epoxy powder corrosion
FBE epoxy powder anti-corrosion structure: electrostatic spraying the surface of the steel epoxy powder coating, a film. The coating has a coating operation is simple, clean, coating impact resistance and bending properties, temperature resistance advantages.
2PE/3PE corrosion
2PE/3PE corrosion structure: the surface of the steel and epoxy powder electrostatic spraying adhesive side wound, lateral wound polyethylene coating, combined with the excellent performance of the three, thus significantly improving the overall quality of pipeline corrosion. Resistant to chemical corrosion, resistance to cathodic disbondment resistance, mechanical damage to properties.
Coal tar epoxy anticorrosive of Hunan Great Steel Pipe Co.,ltd:
Coal tar epoxy anticorrosive structure: from the epoxy resin + filler made of coal tar pitch + anti-corrosion coatings on steel surface coated with glass cloth to strengthen the formation of a coating, commonly used in the pipe wall corrosion. Thickness of 0.5 ~ 1.0mm.
High-density polyethylene jacket corrosion
High density polyethylene jacket corrosion structure: the outer surface of pipe wrapped in high-density polyethylene material, with a high mechanical strength and excellent corrosion resistance, can protect the steel in the transportation, installation and use of the process to avoid external factors the damage.
Manufacture of stent should be added antioxidants, UV stabilizers and carbon black, etc. Polyethylene jacket tube easy to aging, such as open storage tarpaulin and other items appropriate to cover, dumps should stay away from high heat and fire, anti-corrosion coating steel pipe made after the ban exposure, sudden cold, or polyethylene jacket tube easy to crack, the impact product performance and service life.
Processing standard:
1.The petroleum natural gas uses three polyethylene (3PE) Steel pipe anticorrosion
Standard: SY/T0413-2002\DIN30670-1999
2. fluming water, oil, gas Medium and so on use two, three polypropylene (PP) anticorrosion
Standard: DEP 31.40.30.31
3. The petroleum natural gas uses FBE(Single-layer nodulizing epoxy powder anticorrosion) 2FBE(Double-decked nodulizing epoxy powder anticorrosion)
Standard: SY/T0315-2005；Q/CNPC38—2002
4. In the liquid epoxy coating guards against corrosion the steel pipe to be suitable for transportation crude oil, water, natural gas medium and so on
Standard: SY/T0457—2000
5. 8701 tap water antiseptic paint mainly uses in drinking the water conduct, the vessel, its hygienic target achieves tap water Q/12TG3663-2006
6. Epoxy coal tar winding glass cloth mild steel pipe anticorrosion
Standard: SY/T0447-96
The Purpose Guidance Of Welded Steel Pipe
Generally speaking, the welded steel pipes are divided into general welded pipe, galvanized welded pipe, oxygen welding tube, metric system welded tube, transformer tube, welding thin wall pipe and spiral welded pipe etc.
General welded pipe:
General welded pipe adopts Q195A, Q215A and Q235A or mild steel as raw materials. It is used to transfer the low pressure fluid. In addition, the pipes need water pressure, bending and flattening test etc. Usually, it has some certain requirements on the surface quality. The length of delivery is often from 4 to 10mm. The specifications of welded pipe in nominal diameter are different from actual size. Depending on the wall thickness, welded pipe are also divided into common steel pipe and thicken steel pipe.
Galvanized welded pipe:
In order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrical-galvanized pipe with low cost.
Metric system welded tube:
The metric system welded pipe is made from the common carbon steel pipe, quality carbon steel or low alloy steel with the hot and cold welding or after hot welded by the cold again. The specification adopts the seamless steel pipe form with outside diameter*wall thickness (mm). The common metric system welded tube is usually used as structural elements like axis of rotation or transporting the fluid etc. The thin-walled tube is utilized for processing furniture, lamps and lanterns. But the manufacturers need to guarantee the strength and bending of steel pipe in the processing.
Spiral welded tube:
The spiral welded tube uses low carbon structural steel or low alloy structural steel strip according to certain helix angle (forming angle) rolled into a tube billet, then welded the pipe joints to be made. The spiral welded tube can use narrow strip steel to produce large diameter steel pipe. It is broadly applied as oil or natural gas pipeline. Moreover, spiral structural steel pipe has one side welding and double sided welding.
General welded pipe:
General welded pipe adopts Q195A, Q215A and Q235A or mild steel as raw materials. It is used to transfer the low pressure fluid. In addition, the pipes need water pressure, bending and flattening test etc. Usually, it has some certain requirements on the surface quality. The length of delivery is often from 4 to 10mm. The specifications of welded pipe in nominal diameter are different from actual size. Depending on the wall thickness, welded pipe are also divided into common steel pipe and thicken steel pipe.
Galvanized welded pipe:
In order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrical-galvanized pipe with low cost.
Metric system welded tube:
The metric system welded pipe is made from the common carbon steel pipe, quality carbon steel or low alloy steel with the hot and cold welding or after hot welded by the cold again. The specification adopts the seamless steel pipe form with outside diameter*wall thickness (mm). The common metric system welded tube is usually used as structural elements like axis of rotation or transporting the fluid etc. The thin-walled tube is utilized for processing furniture, lamps and lanterns. But the manufacturers need to guarantee the strength and bending of steel pipe in the processing.
Spiral welded tube:
The spiral welded tube uses low carbon structural steel or low alloy structural steel strip according to certain helix angle (forming angle) rolled into a tube billet, then welded the pipe joints to be made. The spiral welded tube can use narrow strip steel to produce large diameter steel pipe. It is broadly applied as oil or natural gas pipeline. Moreover, spiral structural steel pipe has one side welding and double sided welding.
2016年11月22日星期二
DSAW Steel Pipe used in Piling
Piling press with straight seam mild steel pipe production process can be divided into high frequency straight seam submerged arc weld steel pipe and straight seam steel pipe. Submerged arc welding and straight seam steel pipe according to the different forming methods is divided into UOE, RBE, JCOE steel pipes, etc. According to purpose is different, and different production working procedure, after. (can be roughly divided into the scaffold tube, fluid pipe, wire casing, stent tube, guardrail tube etc) DSAW steel pipe of the main processing methods are:
Forging steel: use the reciprocating impact or press pressure forging hammer to make blank as we need to change shape and size of a pressure processing method.
Extrusion: steel metal is placed within the closed extrusion Jane, pressure on the side, make the metal from rules of extrusion die and have same shape and size of the finished product processing method, used in the production of non-ferrous metal material products.
Rolling: steel metal blank through a pair of rotating roll gap (shape), due to the compression of roll reduce material section, the length of the increase of pressure processing method.
Drawn steel: it is already rolling metal blank (type, tube, products, etc.) through the die drawn into section reduced length increased processing methods are mostly used in cold working.
Big Diameter Welded Steel Pipe
Big diameter straight welded steel pipe generally refers to more than 500 mm diameter straight seam steel pipe, is now the biggest diameter 2020 mm, double seam weld maximum diameter is 1220 mm. Mouth straight seam steel pipe domestic general use of GB/T3091-2008, GB/T9711.1-1997, API 5 l standard. Big diameter straight seam steel pipe mainly double-sided LSAW steel pipe production technology, product by the bending, joint, welding, welding, straightening, flat head, such as multi-channel processes, to fulfill the requirements of relevant standards.
Big diameter straight seam steel pipe mainly double-sided submerged arc welding production technology, product by the bending, joint, welding, welding, straightening, flat head, such as multi-channel processes, to fulfill the requirements of relevant standards.
Big diameter straight seam carbon steel pipe is a large water conveyance pipeline engineering, gas engineering, the best choice of the urban pipeline construction, wide prospect of market.
Steel Structure of Spiral Steel Pipe
Spiral welded steel pipe production technology: based on strip steel coil plate for raw materials, through extrusion, with automatic double wire welding double-sided submerged arc welding technology with the spiral seam pipe. Spiral steel pipe for steel structure material classification: 16 mn material spiral steel pipe, Q345B spiral steel pipe, L245 spiral steel pipe, L360 spiral steel pipe, X40 - X80 spiral steel pipe. Commonly used standards of the spiral steel pipe can be divided into: the SY/T5037-2008 (solid, also known as the common fluid conveying pipe with spiral seam submerged arc welding steel pipe), GB/T9711.1-2008 (national standard, also known as oil and gas industry conveying pipe delivery technical conditions in the first part: grade A steel pipe (demanding with GB/T9711.2 grade B steel pipe)), API 5 l (American petroleum institute, also known as the pipeline steel pipe; which can be divided into PSL1 and PSL2 two levels), SY/T5040-2008 (with spiral weld steel pipe pile).
Spiral structural steel pipe in strip steel coil plate for raw materials, often warm extrusion molding, with automatic double wire welding double-sided submerged arc welding technology with the spiral seam pipe.
(1) the raw material is steel strip coil, wire, flux. Have to pass strict physical and chemical inspection before investment.
(2) the strip head to tail docking, use single or double wire submerged arc welding, after rolled DSAW steel pipe adopts automatic submerged arc welding repair welding.
(3) before shaping, strip after flattening, cutting edge, edge planing, transmission and cleaning the surface to the flanging process.
(4) on both sides of the electric contact pressure gauge control conveyor under the pressure of oil cylinder pressure, ensure the smooth delivery of strip steel.
(5) the use of external control or internal control roll forming.
(6) the weld gap control device to ensure that meet the requirements of welding seam clearance, pipe diameter, and quantity of the wrong side of weld gap are tightly controlled.
(7) welding and welding are used within the United States Lincoln welding machine for single or double wire submerged arc welding, to obtain the stable welding specification.
(8) after welding the weld passes the online continuous ultrasonic automatic meter check, ensure the spiral weld nondestructive testing coverage of 100%. If there are defects, automatic alarm and spray tags, production workers to adjust process parameters, in a timely manner to eliminate defects.
(9) by air plasma cutting machine to cut the steel tube into single.
After cut into single pole (10), the head of every batch of steel pipe should be strictly check system, check the weld mechanical properties, chemical composition, amalgamation, steel tube surface quality and the nondestructive flaw detection, ensure that qualified pipe process, can be formally put into production.
(11) have continuous acoustic detection of weld mark parts, after manual ultrasonic and X-ray check, if there are defects, after repair, again through the nondestructive inspection, until defects have been eliminated.
(12) strip steel butt weld and fellowship with spiral weld d joint in the tube, all pass X-ray films and television inspection. (13) each steel pipe after hydrostatic pressure test, radial sealing for the pressure. Test pressure and time are controlled strictly by mild steel pipe hydraulic microcomputer testing device. The parameters automatically printed out.
(14) pipe end machining, make the end verticality, slope Angle and the blunt edge to get accurate control.
2016年11月21日星期一
Could I use welded steel pipe instead of seamless steel pipe in Structural using?
Structural steel pipe in theory should be the same between welded steel pipe and seamless steel pipe, the difference is not very big, straight seam welded steel pipe is better than rules, centroid welded pipe may not in the center, pay particular attention to, when used as a compression member so welded pipe relatively high probability of weld defects, for important parts of the seamless pipe, seamless pipe in the wall thickness not limited by the processing technology can do is very thin (same diameter seamless pipe wall thickness on average than welded pipe thickness), in many cases efficiency than welded pipe seamless tube material, especially the large diameter pipe.
Seamless pipe and welded steel pipe is the biggest difference in the pressure on the gas or liquid transmission (DN).
2016年11月15日星期二
Epoxy Coating Steel Pipe
Epoxy resin coating steel pipe internal and external coating epoxy resin model steel tube of some technical parameters, coating material, epoxy resin general color: white coating thickness: 200 um um - 500 coating way: internal and external coating inside or outside galvanized coating product specifications: DN15-48 ") temperature: - 30 ℃ to 80 ℃ conventional pressure: 0.1 Mpa to 2.5 Mpa (note: according to customer requirements for steel pipe material, wall thickness, size and pressure on customized) connection mode: thread, thread, socket, grooves, flange connection application fields such as: municipal, water supply and drainage, sewage, chemical, thermal power, such as recycled water pipeline steel pipe coating epoxy resin product features: the inside and outside the composite pipe is thermosetting fusion bonded epoxy powder coating on steel pipe surface, the surface is smooth, beautiful, coating itself has stronger corrosion resistance and water resistance. Due to the lining is smooth in use process to prevent microbes breeding, reduce the transmission fluid resistance. The composite pipe (epoxy resin coating, can polyethylene coating, etc.) can effectively prevent the long buried underground plant roots and soil environmental stress brought by the damage.
After the frost on the surface treatment can be used in a - 30 ℃ environment. Life is 1 ~ 2 times more than other similar products. Inspecting &controlling (epoxy resin coating, can polyethylene coating, etc.) can - internal and external coating epoxy composite pipe news with the ministry of construction issued a notice, it is prohibited to use galvanized carbon steel pipe as a feed pipe, extension and application of new plastic pipe material, there are many different kinds of plastic service pipe on the market, through years of engineering application, the plastic pipe is more or less exposed some problems and defects. Due to the linear expansion coefficient of plastic pipe is bigger, some soft plastic tube is not suitable for indoor Ming fu, heat bilges cold shrink bending deformation, affect beautiful; The withstand voltage of heat-resistant ability as being transmission medium temperatures increase gradually decline and use fixed number of year; Plastic service pipe should not be outside the Ming fu, susceptible to ultraviolet sunlight, accelerated aging; Some large diameter mild steel pipe for consumables and connection quality is not easy to control, is neither suitable nor the economy. Inspecting &controlling in water supply in the field of application, has the outstanding advantages. Inspecting &controlling (epoxy resin coating, can polyethylene coating, etc.) can in developed countries has been relatively mature, has been widely used in petroleum, chemical, construction, shipbuilding, communications, electricity and underground gas pipeline, and many other areas, such as the United States, Japan and other countries of the water pipe has a 80% - 90% of the pipe by inspecting &controlling, is currently the alternatives to traditional galvanized pipe better products, was regarded as green environmental protection pipe. inspecting &controlling inspecting &controlling and species is one of the world in recent years the development of a new type of pipe materials, it with steel pipe or steel skeleton as the substrate, and various types of plastic (such as polypropylene, polyethylene, PVC, teflon, etc.) by the compound and into. According to the basic materials and manufacturing process there are three main: steel wire mesh steel strip inspecting &controlling inspecting &controlling, full steel welding inspecting &controlling; According to the combination of technology and plastic and matrix can be divided into lining plastic composite pipe and plastic coated composite pipe two kinds.
How to Choose Coating Steel Pipe
Coating steel pipe can also be called tu plastic tube, its raw material is made of high quality seamless steel pipe, spiral pipe, straight seam welded pipe, the plastic layer using epoxy resin, polyethylene and other plastic. Plastic coated process has coating, plastic, plastic-lining technology has internal expanding type, drawing style, etc. Coating steel pipe are through strict quality system certification and inspection in each process, and its production technology in our country has been very mature, and application market is to develop into all walks of life, over the years by the consensus of the various circles of society, so we can be at ease completely to use it, it is rated "multi-functional multi-purpose" products.
We need to suit the remedy to the case in coating of choose and buy steel pipe, we often hear some people say that a pipe is good, the good is only on one side, it only unilateral performance is outstanding, without taking into account other factors. Household water mild steel pipe, for example, we often use PVC plastic pipe, coated plastic pipe is of the best selling now pipe, household paint will appear big mara car phenomenon, can household pipe need to pipe material has certain corrosion and health, general PVC pipes can meet, if using coated plastic tube is greatly improved, cost is not very economic, so choose pipeline needs to suit the remedy to the case in combination with the practical to choose the most suitable for the purpose of the pipe. Again such as fire tube, fire tube countries are specified using plastic coated steel composite pipes, if you use unilateral pursue cheap plastic pipe, one thousand fires, plastic pipe not resistant to high temperature fuel combustion will occur, the consequences did not dare to imagine, here we should consider the pipe needs to be flame retardant performance, consider other factors, rather than a single to pursue cheap price.
Coated steel pipe is not only the continuation of the carbon steel pipe, the advantages of its high mechanical strength, the impact, bending and other foreign influences have very strong bear ability; It has excellent corrosion resistance, plastic coating has a strong acid and alkali resistance, soil corrosion and corrosion resistance, and other suitable for the use of harsh environment, greatly improve the service life of the product; Good electrical insulation, polyethylene coating has good electrical insulation, need not worry about the electric erosion; Coating adhesion, good weatherability, can be widely used in various fields.
2016年11月14日星期一
Production Machine of DSAW Steel Pipe
Production Machine of DSAW Steel Pipe
Internal weld
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
External weld
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
Finishing machine
Circular tube finishing machine——Adopt three control methods such as automatic pressure control, automatic position control and manual control. Be operated neatly and conveniently. The roundness of the pipes can be ensured for that the carbon steel pipe are formed with relevant arc mould as per various pecifications.
Straightening machine
The machine possesses the accurate micro-inching function, can adjust the micro-inching devices and V-shaped former block as per different specification. Besides, through removing the movable framework to the relevant position to press the pipe asper the curve situation can ensure the straightness.
Ultrasonic online flaw inspection
Controlled automatically by the micro-computer, the inspection blind area is less than 200mm; it can automatically identify the flaw in the weld and the heat effect area, give alarm and locate and mark the flaw, besides, determine the flaw grade and print the inspection report forms as well.
Hydrostatic test
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
X-Ray flaw detect
Radial Generator is imported from America, is used for 100% inspection of the internal & external weld with industrial TV, the image data is stored in real time, the part within 200mm of the pipe ends is taken picture with X-ray. The inspection result is traceable and the quality of mild steel pipe can be ensured.
Pipe end chamfering machine
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
Expanding mill
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
Internal weld
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
External weld
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
Finishing machine
Circular tube finishing machine——Adopt three control methods such as automatic pressure control, automatic position control and manual control. Be operated neatly and conveniently. The roundness of the pipes can be ensured for that the carbon steel pipe are formed with relevant arc mould as per various pecifications.
Straightening machine
The machine possesses the accurate micro-inching function, can adjust the micro-inching devices and V-shaped former block as per different specification. Besides, through removing the movable framework to the relevant position to press the pipe asper the curve situation can ensure the straightness.
Ultrasonic online flaw inspection
Controlled automatically by the micro-computer, the inspection blind area is less than 200mm; it can automatically identify the flaw in the weld and the heat effect area, give alarm and locate and mark the flaw, besides, determine the flaw grade and print the inspection report forms as well.
Hydrostatic test
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
X-Ray flaw detect
Radial Generator is imported from America, is used for 100% inspection of the internal & external weld with industrial TV, the image data is stored in real time, the part within 200mm of the pipe ends is taken picture with X-ray. The inspection result is traceable and the quality of mild steel pipe can be ensured.
Pipe end chamfering machine
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
Expanding mill
The device is controlled by microcomputer, which can automatically identify the flaw in the steel plate, give alarm, locate and mark according to the set standard of flaw detect and inspection; besides, it can comprehensively evaluate the inspection result, determine the flaw grade and print the inspection report forms as well. It has the characteristics such as easy operation and high inspection efficiency.
Development Tendency of Seamless Steel Pipes in 2017
The situation of domestic carbon steel pipe was negative in 2016. Even has the positive currency policy, the funds was still a headache for steel pipe factories. What’s worse, the slowdown economic growth and frequently blocked export environment deteriorated the harsh situation of domestic market. In 2016, the market will be mingled hope and fear. The hope is due to the negative situation in 2015, the market will accelerate the adjustment of production structure and form a new pattern for steel pipe; besides, the policy will also promote the demands for pipes. The fear is that, the steel pipe industry has large production base and long sustained consumption time, with the heavy industrial shadow; it’s difficult to make advancement in a short time. All in all, the mainstream of domestic market is still in depression and the rebound ability is incapable to withstand the downward tendency.
According to statistic, from January to September in 2016, the sales income of large steel pipes factories was 2.24 trillion RMB, a decrease of 19.26 % compare with the same period in last year. The total profit loss was 28.122 billion RMB, the major business loss was 55.271 billion RMB. The experts reached consensus that the steel pipes has entered a harsh state, the oversupply was obvious and the key measurement to solve the problem is to control the production. In addition, in the next two to four years, the steel pipe industry will still in sluggish state, it will take a long time to consume the million tons of production.
Review the steel pipes market in 2016, no matter from aspect of loss and bankruptcy, was the most serious in the history. However, when a thing reaches its extreme, it reverses its course. It’s predictable that the steel pipe market in 2017 will be better than 2015, but the whole industry still face many challenge such as adjusting the industrial structure and upgrading products. In a word, the industry of steel pipe in 2016 is still not so optimistic, the decrease rate will slow down, but the whole trend is difficult to change.
If you also would like to know the news of LSAW steel pipe, pls contact:hunan great steel pipe co.,ltd
Galvanized Coating Steel Pipe Will Be Replaced by Plastic Pipe
For a long time, hot and cold water supply within architecture is adopted the traditional galvanized coating steel pipe. Traditional galvanized steel pipe has been adopted for hot and cold water supply within architecture for a long time.With the continuous development of economy, people's values and concept of life have taken place great changes, the pursuit of health and environmental protection becomes the first choice, so people also pay more and more attention to the tap water quality requirements.
According to the survey, the main cause of deterioration of water quality is pipeline corrosion. Therefore, the construction sector vigorously promotes and adopts new plastic pipe without corrosion problems to take the place of the galvanized pipe in recent years. Random copolymerization polypropylene (PP-R) pipe, cross linked polyethylene cable (PE-x) tube, aluminum plastic clad tube, polybutylene (PB) tube and other new building water supply pipes become the first choice of the market.
Notes for the Connection Method.
When PP-R pipe adopts the hot melting or electric smelting, PP-R pipe and its pipe fittings must be the same material. The specialized installation machines and tools must be approved by material suppliers in the process of installation.When connecting PP-R pipe fittings and metal pipe, we should adopt PP-R tube fittings as a transition item. When it is the hot melt connection with PP-R pipe fittings, it should be connected by threaded connection. For large diameter pipes, it also can be used flange connection.
When the pipe adopts the hot melt connection, we should do according to the following steps:
(1) Plug in the melt tools. Commence operation until the working temperature indicator is light.
(2) Make end face perpendicular to the axis of the tube when cutting pipes. Mild steel pipe cutting generally uses pipe cutting machine. We can use hacksaw if necessary, but we should remove flash and burr after cutting pipe end.
(3) Pipes and pipe fittings junction surface should be clean, dry and oil free.
(4) Use an appropriate pen to plot out the hot melt depth.
(5) According to the requirement of design drawing, we need to pay attention to the direction of the tube when welding elbow or tee joints.
Welcome to visit Hunan Great Steel Pipe Co.,ltd to know more about steel products.
According to the survey, the main cause of deterioration of water quality is pipeline corrosion. Therefore, the construction sector vigorously promotes and adopts new plastic pipe without corrosion problems to take the place of the galvanized pipe in recent years. Random copolymerization polypropylene (PP-R) pipe, cross linked polyethylene cable (PE-x) tube, aluminum plastic clad tube, polybutylene (PB) tube and other new building water supply pipes become the first choice of the market.
Notes for the Connection Method.
When PP-R pipe adopts the hot melting or electric smelting, PP-R pipe and its pipe fittings must be the same material. The specialized installation machines and tools must be approved by material suppliers in the process of installation.When connecting PP-R pipe fittings and metal pipe, we should adopt PP-R tube fittings as a transition item. When it is the hot melt connection with PP-R pipe fittings, it should be connected by threaded connection. For large diameter pipes, it also can be used flange connection.
When the pipe adopts the hot melt connection, we should do according to the following steps:
(1) Plug in the melt tools. Commence operation until the working temperature indicator is light.
(2) Make end face perpendicular to the axis of the tube when cutting pipes. Mild steel pipe cutting generally uses pipe cutting machine. We can use hacksaw if necessary, but we should remove flash and burr after cutting pipe end.
(3) Pipes and pipe fittings junction surface should be clean, dry and oil free.
(4) Use an appropriate pen to plot out the hot melt depth.
(5) According to the requirement of design drawing, we need to pay attention to the direction of the tube when welding elbow or tee joints.
Welcome to visit Hunan Great Steel Pipe Co.,ltd to know more about steel products.
China Welded Steel Pipe Market Has Good Prospects
Welded steel pipe is made of steel belt or steel plate and bended into deformation shapes such as round, square and so on, whose surface is jointed. Since the 30s of last century, with the rapid development of high-quality strip steel rolling production and technology of welding and inspection, welding quality improves constantly. Welded steel pipe was developed with increasing specifications and replaced seamless steel tube in more and more fields because welded steel pipe has lower cost and higher production efficiency.
Statistics in Production and Marketing Demand and Investment Forecast Analysis Report of China Welded Steel Pipe in 2014-2018 released by Forward-looking Industry Research Institute showed that the welded steel pipe output in Tianjin was 1.326 million tons in October 2013, increasing by 7.10% compared with last year earlier. The welded steel pipe production in Hebei was 1.081 million tons, increasing by 6.40% than a year earlier. The welded steel pipe output in Tianjin and Hebei reached 23.176 million tons from January 1, 2013, to October 1, 2013. The two places produce large amount of welded steel pipe in China.
Forward-looking Industry Research Institute analyses that the demand market of welded steel pipe industry in China is oil and gas exploitation and transportation, water, water conservancy construction, metal pressure vessel, construction steel structural steel pipe, etc., in which oil and gas exploitation and transportation is the main demand market.
The total length of the second line of West-East natural gas transmission project, for example, is 9035 kilometers. The application amount of welded steel pipe is 4.326 million tons, in other words, the average application amount of welded steel pipe is 478.8 tons per kilometer. China will strive to develop the oil and gas pipeline during the 12th Five-Year Plan period. The government has clearly put forward in the 12th Five-Year Plan outline that they will set in the construction of the second phrase of oil pipeline between China and Kazakhstan, the territory passage of China and Myanmar oil, the second phrase of central Asia gas pipeline, the third line and the fourth line of West-East natural gas transmission project and other backbone engineering. They will build the suitable lines and a complete set of regional and urban pipe network. The total length of oil and gas pipelines will exceed 150000 km until 2015.
Under the relevant development planning, it faces better development prospects for oil and gas pipe network, coal-gas pipeline, deep sea oil and gas pipeline, etc in the future, effectively promoting the development of carbon steel pipe industry in China.
Statistics in Production and Marketing Demand and Investment Forecast Analysis Report of China Welded Steel Pipe in 2014-2018 released by Forward-looking Industry Research Institute showed that the welded steel pipe output in Tianjin was 1.326 million tons in October 2013, increasing by 7.10% compared with last year earlier. The welded steel pipe production in Hebei was 1.081 million tons, increasing by 6.40% than a year earlier. The welded steel pipe output in Tianjin and Hebei reached 23.176 million tons from January 1, 2013, to October 1, 2013. The two places produce large amount of welded steel pipe in China.
Forward-looking Industry Research Institute analyses that the demand market of welded steel pipe industry in China is oil and gas exploitation and transportation, water, water conservancy construction, metal pressure vessel, construction steel structural steel pipe, etc., in which oil and gas exploitation and transportation is the main demand market.
The total length of the second line of West-East natural gas transmission project, for example, is 9035 kilometers. The application amount of welded steel pipe is 4.326 million tons, in other words, the average application amount of welded steel pipe is 478.8 tons per kilometer. China will strive to develop the oil and gas pipeline during the 12th Five-Year Plan period. The government has clearly put forward in the 12th Five-Year Plan outline that they will set in the construction of the second phrase of oil pipeline between China and Kazakhstan, the territory passage of China and Myanmar oil, the second phrase of central Asia gas pipeline, the third line and the fourth line of West-East natural gas transmission project and other backbone engineering. They will build the suitable lines and a complete set of regional and urban pipe network. The total length of oil and gas pipelines will exceed 150000 km until 2015.
Under the relevant development planning, it faces better development prospects for oil and gas pipe network, coal-gas pipeline, deep sea oil and gas pipeline, etc in the future, effectively promoting the development of carbon steel pipe industry in China.
2016年11月11日星期五
Quality Control Skills in Welding of LSAW Steel Pipe
LSAW Steel Pipe to control the quality, in order to safely carry out production operations, but also to protect the operator an essential element of personal safety. The main application areas are: large span grid project, building steel structure project, electric power and EHV transmission and distribution project, mechanical engineering, bridge, bridge, railway station, airport, stadium steel structure project, municipal pipe network, Foundation piling, water gas pipeline and highway construction and other supporting facilities.
1, According to the welding process specification review wire and flux specifications are correct, to prevent the wrong use of welding wire and flux caused by welding quality accidents.
2, The welding environment to monitor, when the welding environment is not good (temperature below 0 ℃, relative humidity greater than 90%) should be taken after the appropriate measures for welding.
3, Before the first test groove size, including the gap, blunt edge, angle and the wrong mouth, etc. whether the process requirements.
4, In the submerged arc welding process automatically selected inside and outside the welding current, welding voltage, welding speed and other process parameters are correct.
5, Supervise the welding personnel in the submerged arc welding inside and outside the full use of steel tube side of the arc plate length to strengthen the arc inside and outside the welding of the use of efficiency, which helps to improve the quality of the pipe end welding.
6, Supervise the welding personnel in the welding when the first slag clean up, whether it has been completely handled joints, groove at whether oil, rust, slag, water, paint and other dirt.
If you would like to know more about LSAW or DSAW steel pipe,pls contact:Hunan great steel pipe co.,ltd
1, According to the welding process specification review wire and flux specifications are correct, to prevent the wrong use of welding wire and flux caused by welding quality accidents.
2, The welding environment to monitor, when the welding environment is not good (temperature below 0 ℃, relative humidity greater than 90%) should be taken after the appropriate measures for welding.
3, Before the first test groove size, including the gap, blunt edge, angle and the wrong mouth, etc. whether the process requirements.
4, In the submerged arc welding process automatically selected inside and outside the welding current, welding voltage, welding speed and other process parameters are correct.
5, Supervise the welding personnel in the submerged arc welding inside and outside the full use of steel tube side of the arc plate length to strengthen the arc inside and outside the welding of the use of efficiency, which helps to improve the quality of the pipe end welding.
6, Supervise the welding personnel in the welding when the first slag clean up, whether it has been completely handled joints, groove at whether oil, rust, slag, water, paint and other dirt.
If you would like to know more about LSAW or DSAW steel pipe,pls contact:Hunan great steel pipe co.,ltd
Advantages of Submerged Arc Welding Spiral Steel Pipe
In the spiral welded steel pipe production process and the use, there are invented a lot of excellent welding and methods of production, greatly contributed to the steady and rapid development of the industry, but also makes this industry has been optimized in development. Which submerged arc welding is a welding method in a new invention in 1940, it and the front of the place is the same manual welding or the use of slag to protect it, but this is not the slag electrode coating steel pipe, is designed smelting flux out. Changed after the wire, the wire delivery device with a plate and the wire, the wire is continuously sent, this welding wire is fed continuously in a granular fusible flux covering ignition arc welding wire, base material and part of the melting and evaporation flux forms a cavity, the arc is stable combustion in the cavity inside, so call it submerged arc welding. Arc is buried in the inside of the cavity. The welding flux hopper loading system consists of a drug delivery through a pipe to be welded to the front of the second type of welding is used, the use of wire, since the wire can be continuously sent; Rod, a rod that we must have a burn a welding head gave the throw, and the operation was stopped, and then change electrode welding.
And such welding method compared with other methods is the great advantage, the first advantage is fully automated; the second advantage, which is buried Under arc welding, so it's the heat exchange and protection of relatively strong performance, high quality welding out; third advantage, because the LSAW steel pipe buried in the flux, so it can be used a large current, welding efficiency relatively high.
And such welding method compared with other methods is the great advantage, the first advantage is fully automated; the second advantage, which is buried Under arc welding, so it's the heat exchange and protection of relatively strong performance, high quality welding out; third advantage, because the LSAW steel pipe buried in the flux, so it can be used a large current, welding efficiency relatively high.
Hunan Great Steel Pipe Co.,ltd wait for you in Expo Oil and Gas Colombia 2016
Expo Oil and Gas Colombia 2016 is coming!!! We have prepare everything to welcome our respect customer.
If you are interested in our product and our company,we wait for you in 226-4(Booth No).
More information about Hunan Great Steel Pipe Co.,ltd,pls visit:www.great-pipe.com
2016年11月8日星期二
ERW Pipe VS HFW Pipe
ERW steel pipe refers to electric resistance welded steel pipe.It's one kind of welded steel pipe without flux. ERW pipe is manufactured from the DSAW steel pipe. The welding process for ERW/HFW pipe is continous as apposed to welding of dinstinct sections at intervals.
ERW process uses steel coil as feedstock. In steel pipe field,we usually regard these two name as the same thing.
ERW process uses steel coil as feedstock. In steel pipe field,we usually regard these two name as the same thing.
ASTM A252 GR 2 Steel Piling Pipe
ASTM A252 GR 2 mild steel pipes are widely used for various projects and construction building,just because it's cheap but the steel pipe properties are also acceptable for projects application.Mild steel contains approximately 0.05-0.32% carbon making it malleable and ductile.Mild steel pipe has a relatively low tensile strength,but it is cheap and malleable;surface hardness can be increased through carburizing.
A252 GR2 mild steel pipe are mainly for piling tubes and structural steel pipe purpose.Large diameter steel pipe piles could be used in cross sea bridge,cross mountain bridge,building foundation,building backbones application.
Hunan great steel pipe co.,ltd is pleased to contribute to the construction of economy of worldwide.
Tensile Tests of EN10219 ERW Mild Steel Pipe
The tensile tests of EN10219 S355J0/JR/J2 ERW mild steel pipe shall be carried out in accordance with EN10002-1.
For the specified yield strengths of EN10219 S355J0/JR/J2 ERW mild steel pipe in Tables A.3,B,4 and B.5, the upper yield strength(ReH) shall be determined.
If a yield phenomenon is not present,the 0,2% proof strengh non-proportional extension(Rp0.2) or the 0,5%proof strength total extension shall be determined.In cases of dispute,the 0.2% proof strenght shall apply.
For EN10219 S355J0/JR/J2 ERW welded steel pipe with thickness less than 3mm the percentage elongation may be reported for a guage length of 80mm or 50mm.
ASTM A53 Structural Steel Pipe
It's common in the STD ERW structural steel pipe field that the max.diameter is 660mm.But the technology is developed and some mill even can produce OD 720 STD ERW pipes for large diameter application pipes in engineering fields as per ASTM A53 spec,API 5L standard etc.
Hunan great steel pipe co.,ltd is advanced equipped and is able to manufacturer 660mm schedule STD ERW steel pipe in mature technology and very standard product procedure.
Large diameter 660mm ERW pipe schedule in SCH20,SCH30,SCH40 STD could be more widely used in gas and oil line pipe transportaion,construction of bridge or building. As ERW pipe is more cost saved than LSAW steel pipe and have better properties than SSAW steel pipe.Large diameter ERW pipe and tube will be in large demand in applications like gas&oil fields,piling piles,constructions etc.
Hunan great steel pipe co.,ltd is advanced equipped and is able to manufacturer 660mm schedule STD ERW steel pipe in mature technology and very standard product procedure.
Large diameter 660mm ERW pipe schedule in SCH20,SCH30,SCH40 STD could be more widely used in gas and oil line pipe transportaion,construction of bridge or building. As ERW pipe is more cost saved than LSAW steel pipe and have better properties than SSAW steel pipe.Large diameter ERW pipe and tube will be in large demand in applications like gas&oil fields,piling piles,constructions etc.
2016年11月6日星期日
Heavy Anti-Dumping Duties Hit Chinese Anti-Corrosive Steel Imports
The Department of Commerce found that imports of corrosion-resistant steel products from China, India, Italy, and Korea, had been illegally dumped in the US, in violation of international law, and also announced a negative preliminary determination in the anti-dumping investigation of imports of corrosion-resistant carbon steel pipe from Taiwan.
Corrosion-resistant steel is the latest to receive anti-dumping protection. Source: AdobeStock/icarmen3.
All other producers/exporters in China received the China-wide rate of 255.80%. This
As a result of the preliminary affirmative determinations, Commerce will instruct U.S. Customs and Border Protection (CBP) to require cash deposits based on these preliminary rates.
Many of these producers are already paying countervailing duties on their imports of hot-dipped galvanized and other anti-corrosive coating steel pipe.
Corrosion-resistant steel is the latest to receive anti-dumping protection. Source: AdobeStock/icarmen3.
All other producers/exporters in China received the China-wide rate of 255.80%. This
As a result of the preliminary affirmative determinations, Commerce will instruct U.S. Customs and Border Protection (CBP) to require cash deposits based on these preliminary rates.
Many of these producers are already paying countervailing duties on their imports of hot-dipped galvanized and other anti-corrosive coating steel pipe.
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