Carbon steel pipe pickling method currently are used in the construction and management of two trough pickling pickling inner loop.
(1) trough pickling. The installed piping removed after decomposition into pickling bath soak treatment after passing their secondary installation. This method is suitable for larger diameter tube short, straight, easy to disassemble, piping and a small amount of on-site piping system hydraulics hydraulic piping construction of small amounts of occasions, such as pumping stations, valve stations inside, can be used trough pickling method.
(2) structural steel pipe loop pickling. In the installed hydraulic components in the hydraulic lines disconnected or removed with a hose, receivership, rinse cover joints, constitute rinse loop. Acid pump acid into the circulating loop pickling. The pickling method is more advanced construction technology in recent years, with the pickling speed, good effect, the process is simple, easy to operate, reducing pollution on the human body and the environment, reduce labor intensity and shorten the pipeline installation period, resolve long lines and complex piping pickling difficult problem, and to avoid secondary pollution problems trough pickling easy assembly occurs, has been widely used in the construction of large hydraulic system piping.
Pickling formula and process piping will cause unreasonable tube wall can not be completely ex oxide, wall over corrosion, corrosion of the coating steel pipe wall and the tube again residual chemical reactions sediment and other phenomena.
2016年12月23日星期五
Lamination Defect Control Measures of LSAW and DSAW Steel Pipe
Lamination defect control measures of DSAW steel pipe is following below:
1, to improve the toughness of plastic tube
Improve the cleanliness of molten steel, to reduce the harmful inclusions; increase the proportion of the slab crystal axis, to reduce the center segregation and center porosity; the use of reasonable cooling system to avoid cracks occur within the slab; billet or rolling slab to be taken offline slow cooling process, reduce internal stress, thus ensuring the microstructure and mechanical properties of the finished tube and pipe meet the technical standards.
2, the reasonable control of the heating temperature
By measuring the thermoplastic curve, choose the best heating temperature. Note also that there is enough heating tube holding time, in order to reduce and improve plastic deformation resistance and toughness.
3, lower roll speed
Roll speed is a key parameter piercing process, the roll speed from low to high variations in the process, there is a critical stratification began the roll speed. Lower roll speed, easy to form tube bore; higher roll speed, tube and capillary easily form a layered defects. In order to eliminate delamination defects and capillary tube, roll speed should be reduced to the beginning of the critical delamination roll speed of these mild steel pipe.
1, to improve the toughness of plastic tube
Improve the cleanliness of molten steel, to reduce the harmful inclusions; increase the proportion of the slab crystal axis, to reduce the center segregation and center porosity; the use of reasonable cooling system to avoid cracks occur within the slab; billet or rolling slab to be taken offline slow cooling process, reduce internal stress, thus ensuring the microstructure and mechanical properties of the finished tube and pipe meet the technical standards.
2, the reasonable control of the heating temperature
By measuring the thermoplastic curve, choose the best heating temperature. Note also that there is enough heating tube holding time, in order to reduce and improve plastic deformation resistance and toughness.
3, lower roll speed
Roll speed is a key parameter piercing process, the roll speed from low to high variations in the process, there is a critical stratification began the roll speed. Lower roll speed, easy to form tube bore; higher roll speed, tube and capillary easily form a layered defects. In order to eliminate delamination defects and capillary tube, roll speed should be reduced to the beginning of the critical delamination roll speed of these mild steel pipe.
2016年12月21日星期三
Limitations of DSAW Steel Pipe
DSAW steel pipe also has its own shortcomings, spiral steel hollow section is used as a large number of pipeline fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding.
Structural steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe.
However, the mild steel pipe also has some limitations, such as under the conditions by plane bending, tube as good as square, rectangular tube large flexural strength, the skeleton of some farm machinery, steel and wood furniture on the popular square, rectangular tube. According to different uses should also have other special-shaped pipe cross-sectional shape.
Structural steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe.
However, the mild steel pipe also has some limitations, such as under the conditions by plane bending, tube as good as square, rectangular tube large flexural strength, the skeleton of some farm machinery, steel and wood furniture on the popular square, rectangular tube. According to different uses should also have other special-shaped pipe cross-sectional shape.
Solutions of Oil Casing Folding Defects
Casing mild steel pipe in the production prone to outer folding defects, affect product quality improvement, it needs to be controlled.
There are several outer folding edge oxide particles cause segregation of elements, with a folding, an oxide middle folding, the presence of an excess of Al, Mg, Ca, S, P, Mn, Si outer folding element, particularly at the grain boundaries have 20μm so brittle inclusions SiO2 and silicates, intergranular fracture occurs, and said brittle inclusions is the main reason for the formation of the outer fold.
Smelting process:
1) To ensure that a pull carbon hit, after avoiding blowing carbon control endpoint> 0.10%;
2) Increase the effect of converter slag, slag under strict control, the departure process using slag, a steel ladle slag after thickness <50mm;
3) Double slag operation, control phosphorus content of the molten steel.
Refining process:
1) LF refining processing time ≥20min;
2) Strengthening deoxy go mixed results. Requirements refining slag basicity ≥2.5, slag ≤1%, white residue retention time ≥15min;
3) After the end of the bottom blowing argon refining to ensure soft blowing time ≥10min, to facilitate removal of molten structural steel pipe inclusions.
Casting process:
1) Using a ladle, tundish, protective casting and seal argon, oxidation-free protective casting;
2) Casting temperature: tundish superheat less than 20 ℃;
3) The use of mold level brake control, electromagnetic stirring;
4) Using special flux, to ensure the quality of the slab surface.
Finishing processes:
To reduce the white spots caused by hydrogen induced cracking deal billets and bars the use of slow cooling process with carbon steel pipe.
There are several outer folding edge oxide particles cause segregation of elements, with a folding, an oxide middle folding, the presence of an excess of Al, Mg, Ca, S, P, Mn, Si outer folding element, particularly at the grain boundaries have 20μm so brittle inclusions SiO2 and silicates, intergranular fracture occurs, and said brittle inclusions is the main reason for the formation of the outer fold.
Smelting process:
1) To ensure that a pull carbon hit, after avoiding blowing carbon control endpoint> 0.10%;
2) Increase the effect of converter slag, slag under strict control, the departure process using slag, a steel ladle slag after thickness <50mm;
3) Double slag operation, control phosphorus content of the molten steel.
Refining process:
1) LF refining processing time ≥20min;
2) Strengthening deoxy go mixed results. Requirements refining slag basicity ≥2.5, slag ≤1%, white residue retention time ≥15min;
3) After the end of the bottom blowing argon refining to ensure soft blowing time ≥10min, to facilitate removal of molten structural steel pipe inclusions.
Casting process:
1) Using a ladle, tundish, protective casting and seal argon, oxidation-free protective casting;
2) Casting temperature: tundish superheat less than 20 ℃;
3) The use of mold level brake control, electromagnetic stirring;
4) Using special flux, to ensure the quality of the slab surface.
Finishing processes:
To reduce the white spots caused by hydrogen induced cracking deal billets and bars the use of slow cooling process with carbon steel pipe.
2016年12月19日星期一
The Basic Information of Steel Pipe ASTM Standards
As known to all that steel pipes contains API carbon steel pipe, black steel pipe ,welded steel pipe,but whether you know the knowledge of ASTM Steel Pipe Standards. Today,we can discuss the problem of ASTM Steel Pipe Standards.
When it comes to ASTM Steel Pipe Standards,the first thing we need to consider is that what is ASTM. From the wiki,we can find that ASTM is a large organization that develops standards for different materials which are manufactured and generally used in construction or industry. And the organization is what is called a voluntary standards development company and they are independent of the manufacturers. Standards for each type of pipe can be downloaded or purchased in print from ASTM and several other website which host their documentation.
The mild steel pipe grading will be divided Depends on ASTM standards and ASME standards. And ASTM's steel standards are instrumental in classifying, evaluating, and specifying the material, chemical, mechanical, and metallurgical properties of the different types of steels, which are primarily used in the production of mechanical components, industrial parts, and construction elements, and other accessories related to them. The steels can be of the carbon, structural steel pipe, stainless, ferritic, austenitic, and alloy types. These steel standards are helpful in guiding metallurgical laboratories and refineries, product manufacturers, and other end-users of steel and its variants in their proper processing and application procedures to ensure quality towards safe use.
There are a lot of category of ASTM standards available,such as A514 steel,ASTM A325,ASTM A354,ASTM A490,ASTM A500,ASTM A53,ASTM C 1112 and so on. However,how to decide a steel pipe's grade? And ASTM conducts testing in controlled conditions, such as mechanical tests that include bending, hydrostatic and flattening by machine. When testing welded steel pipe for welding purposes, the ASTM takes into consideration standard, tungsten arc welding techniques.
When it comes to ASTM Steel Pipe Standards,the first thing we need to consider is that what is ASTM. From the wiki,we can find that ASTM is a large organization that develops standards for different materials which are manufactured and generally used in construction or industry. And the organization is what is called a voluntary standards development company and they are independent of the manufacturers. Standards for each type of pipe can be downloaded or purchased in print from ASTM and several other website which host their documentation.
The mild steel pipe grading will be divided Depends on ASTM standards and ASME standards. And ASTM's steel standards are instrumental in classifying, evaluating, and specifying the material, chemical, mechanical, and metallurgical properties of the different types of steels, which are primarily used in the production of mechanical components, industrial parts, and construction elements, and other accessories related to them. The steels can be of the carbon, structural steel pipe, stainless, ferritic, austenitic, and alloy types. These steel standards are helpful in guiding metallurgical laboratories and refineries, product manufacturers, and other end-users of steel and its variants in their proper processing and application procedures to ensure quality towards safe use.
There are a lot of category of ASTM standards available,such as A514 steel,ASTM A325,ASTM A354,ASTM A490,ASTM A500,ASTM A53,ASTM C 1112 and so on. However,how to decide a steel pipe's grade? And ASTM conducts testing in controlled conditions, such as mechanical tests that include bending, hydrostatic and flattening by machine. When testing welded steel pipe for welding purposes, the ASTM takes into consideration standard, tungsten arc welding techniques.
What Should You Know About API Steel Pipe?
There are various kinds of steel pipes both in domestic and international markets for your selection. For example, the API steel pipe is one of the popular steel pipes actually. They are widely used to transport gas, oil or water. The API pipe can be classified into seamless steel pipe, ERW steel pipe, submerged arc welded steel pipe and so forth.
The API is short for American Petroleum Institute actually. The API pipe is very popular among oil and gas exporters across the world for their reliability. There are also various kinds of API pipes which are designed to satisfy different kinds of requirements in diverse areas.
The API pipe is different per size, length, thickness and so forth. They are created to satisfy different petroleum industry requirements, like production, refinement, distribution and so forth. It is the ideal choice for use in gas lines actually. Such kind of mild stee pipe is very popular among gas and oil exporters for their reliability. The pipe should be provided with high quality, robustness and mechanical toughness actually. And API pipe should be strong enough to withstand all kinds of harsh weather and the temperature conditions in the petroleum industry for production, distribution and so forth.
Nowadays, with the development of science and technology, and with the development of communication, it is not difficult for you to find a reliable API carbon steel pipe supplier. You can choose it from physical suppliers and online suppliers actually. There are various kinds of steel pipes every nook and corner of the world. And most of the suppliers or manufacturers provide added services like cutting, beveling, threading, sand blasting, coating, testing and so forth.
The API is short for American Petroleum Institute actually. The API pipe is very popular among oil and gas exporters across the world for their reliability. There are also various kinds of API pipes which are designed to satisfy different kinds of requirements in diverse areas.
The API pipe is different per size, length, thickness and so forth. They are created to satisfy different petroleum industry requirements, like production, refinement, distribution and so forth. It is the ideal choice for use in gas lines actually. Such kind of mild stee pipe is very popular among gas and oil exporters for their reliability. The pipe should be provided with high quality, robustness and mechanical toughness actually. And API pipe should be strong enough to withstand all kinds of harsh weather and the temperature conditions in the petroleum industry for production, distribution and so forth.
Nowadays, with the development of science and technology, and with the development of communication, it is not difficult for you to find a reliable API carbon steel pipe supplier. You can choose it from physical suppliers and online suppliers actually. There are various kinds of steel pipes every nook and corner of the world. And most of the suppliers or manufacturers provide added services like cutting, beveling, threading, sand blasting, coating, testing and so forth.
How to Prevent Steel Pipe From Rust
As we all know that mild steel pipe is widely used in homes and constructions as railings, or guardrails for different purposes. There are various kinds of steel pipe, like API steel pipe, or American Petroleum Institute steel pipe. Like other steel products, the steel pipe will rust after exposure to moisture for long time. So, to prevent steel pipe from rust, some measures should be taken, like painting the surface with an exterior paint that seals out moisture. Follow me to get more details.
First of all, prepare things you will need, like cleaner, rags, mineral spirits, primer, rustproof exterior paint, 200-grit sandpaper. Then clean the pipe thoroughly to remove grease, dirt, grime and salt deposits. Clean the pipe by using a heavy-duty cleaner and rags. Then use mineral spirits and rag to clean it again to remove remaining grease left on the pipe.
Second, if the carbon steel pipe has a sheeny surface that may affect the adhesion, you are advised to rough sand it. Rough the steel pipe surface lightly with metal abrasive sandpaper. A towel will be needed to wipe away all residue from sanding.
Third, add a primer to the steel pipe surface. Spray the primer to the pipe and allow it to dry naturally. The primer is not required if you are using a metal spray-paint system designed specially for steel. Then, apply the final coat of paint to the steel pipe as directed by the instructions. The welded steel pipe and structural steel pipe are also available. For more detailed information about steel pipe, you can visit Hunan Great Steel Pipe Co.,ltd. We are dependable manufacturer of steel pipe and we have great reputation among consumers both at home and abroad for high quality and competitive price.
First of all, prepare things you will need, like cleaner, rags, mineral spirits, primer, rustproof exterior paint, 200-grit sandpaper. Then clean the pipe thoroughly to remove grease, dirt, grime and salt deposits. Clean the pipe by using a heavy-duty cleaner and rags. Then use mineral spirits and rag to clean it again to remove remaining grease left on the pipe.
Second, if the carbon steel pipe has a sheeny surface that may affect the adhesion, you are advised to rough sand it. Rough the steel pipe surface lightly with metal abrasive sandpaper. A towel will be needed to wipe away all residue from sanding.
Third, add a primer to the steel pipe surface. Spray the primer to the pipe and allow it to dry naturally. The primer is not required if you are using a metal spray-paint system designed specially for steel. Then, apply the final coat of paint to the steel pipe as directed by the instructions. The welded steel pipe and structural steel pipe are also available. For more detailed information about steel pipe, you can visit Hunan Great Steel Pipe Co.,ltd. We are dependable manufacturer of steel pipe and we have great reputation among consumers both at home and abroad for high quality and competitive price.
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