L245Q seamless steel pipe

 L245Q seamless steel tube is a hollow section, no seams around the strip steel. Steel pipe has a hollow section, a large number of used for conveying fluid pipe, such as oil, natural gas, coal gas, water and some solid materials, such as pipelines. Compared to the steel pipe and round steel solid steel bending torsional strength phase at the same time, the weight is lighter, is a kind of economic cross section steel, widely used in the manufacture of structural and mechanical parts, such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel scaffolding is used. With steel pipe manufacturing annular parts, can improve material utilization, simplifying the manufacturing process, material saving and processing time, such as rolling bearing ring, jack sets, at present has been widely made from carbon steel pipe. Steel pipe or all kinds of conventional weapons indispensable materials, gun, gun barrel to steel pipe manufacturing. Steel pipe according to the cross-sectional area in the shape of different can be divided into circular tube and special pipe. Due to the equal conditions, the circumference circle area is the largest, with circular tube can deliver more fluid. In addition, the circle cross section under radial pressure, the internal or external stress is relatively uniform, therefore, the vast majority of steel tube is round tube. But, pipe also has some limitations, such as in the plane bending condition, the pipe is not square, rectangular tube bending strength is big, some agricultural machinery and skeleton, rectangular tube, steel wood furniture is commonly used. According to the different USES also needs to have other cross section shape of profiled steel pipe. Classification of seamless steel tube Seamless steel pipe according to the manufacturing methods are divided into hot rolling and cold drawing (rolling) tube. Cold drawing (rolling) tube maximum nominal diameter is 200 mm, maximum nominal diameter is 600 mm hot rolling pipe. In pipeline engineering, more than 57 mm diameter, often choose hot-rolled tube, pipe diameter less than 57 mm often used pipe cold drawing (rolling). Pipeline engineering commonly used seamless steel pipe has the following three kinds: 2.1 the general seamless steel tube General seamless steel tube or seamless steel tube, using ordinary carbon steel, quality carbon steel, low alloy steel and alloy steel manufacturing, used for conveying liquid pipe or production structure, parts made with. Seamless steel pipe according to outer diameter and wall thickness of supply, a variety of wall thickness under the same outer diameter, pressure range is larger. Usually mild steel pipe length, hot-rolled tube is 3-12.5 m, cold drawing (rolling) tube is 1.5 to 9 m. 2.2 low medium pressure boiler seamless steel tube medium pressure boiler seamless steel tube is made of 10, 20 quality carbon steel, the working temperature.

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High frequency welded pipe ERW roll machine

Roller unit in high frequency welded steel pipe (ERW), and other various roll machine is make (rolling) produce plastic deformation of metal tools, is important in determining the quality of efficiency and rolling mill consumption parts. Roll is one of the important parts on the rolling mill rolling mills, the use of a pair or a group of roll rolling pressure generated by rolling grinding steel. It mainly bear the movement when the rolling load, the influence of wear and temperature changes. Roll a lot of more phyletic, the current commonly used roll cast steel, cast iron roll and variety of roll forging roll three categories, the profile and a small amount of carbide roll mill. (a) molding methods: casting roll and roll forging; Carbon steel pipe casting roll refers to the smelting or melting molten iron directly pouring the kinds of roll forming the mode of production manufacturing. The casting roll according to the material and can be divided into two categories, cast iron roll and cast iron roll; According to the manufacturing methods and can be divided into the overall casting roll and casting roll. Forging roll according to the material classification is as follows: (1) the forged alloy steel roll; (2) forging semisteel roller; (3) forging semi high speed steel roll; (4) forged white cast iron roll. (2) according to the process: the overall composite roll and roll, metallurgical combination roll 1. The whole roll is relative to the compound roll, the roll of the roll and roll neck of outer layer and the core adopts single material casting or forging, roll the outer roll neck and different organizations, the performance by casting or forging process and heat treatment process to control and adjust. Static casting forging roll and roll all belong to the whole roll. The whole roll into the whole casting and forging of the whole roll two; 2. Metallurgy composite casting roll are mainly half flush composite casting, the overflow (irrigation) composite casting, the centrifugal composite casting three, in addition to Continuous casting coated (CPC - Continuous PouringProcess for Cladding), spray deposition, Hot isostatic pressing (HIP - Hot Isostatically Pressed), electroslag welding and other special manufacture compound roll type composite method. Composite roll roll is mainly set set of combinations. (3) according to the manufacturing material: cast steel roll series, series of cast iron roll and roll forging series (4) roll type is the most often used heat treatment: to stress annealing, isothermal spheroidizing annealing, normalizing, tempering, diffusion annealing, quenching, cryogenic treatment. Cangzhou vibration of roll have different classified method. According to the roll shape into the cylinder and the cylinder, the former is mainly used for plate, strip, profiles and wire production, high-frequency steel roll which is mainly used for structural steel pipe production unit.

Compared of seamless steel pipe and ERW steel pipe 2

8, impact test

Several times due to the impact toughness of ERW steel pipe to seamless steel tube, the impact toughness of welds is the key of ERW steel pipe, by controlling the impurity content of raw material, slitting, molding of edge burr height and direction form, Angle of welding, welding speed, heating power and frequency, welding extrusion amount, intermediate frequency withdraws from the depth, temperature and air cooling length of process parameters to ensure the weld to that of the parent metal of more than 60%, further optimization, such as can realize welding seam impact energy is close to the parent metal, so as to achieve performance as seamlessly.

9, the blasting test

ERW steel pipe blasting test performance is much higher than standard requirements, mainly is the result of ERW steel pipe wall thickness uniform high uniformity and outside diameter size.

10, straightness,

ERW steel pipe belongs to cold working, and under the conditions of reducing on-line straightening, plus is infinite times ruler, so the straightness is good; Seamless steel tube in the condition of plastic molding and haploid feet (rolling for 3 ~ 4 times feet) pipe straightness is relatively difficult to control.

11, appearance

Seamless steel tube used in billet surface defects cannot be eliminated by hot rolling process, only in the completion of the finished product, burnish drops defects; For screw hole left behind, in the process of reduction of wall, can only get part to eliminate. ERW welded steel pipe with hot rolled plate as raw material, rolled plate surface quality is ERW steel tube surface quality, and the surface quality of hot-rolled coil plate is easy to control and the quality is higher, so the surface quality of the ERW steel tube is far better than that of seamless steel tube.

12, thousands of meters of penetration casing steel consumption

Uniform of ERW steel pipe wall thickness, the wall thickness tolerance is negligible, and seamless steel tube wall thickness difference of control accuracy limit for plus or minus 5% t, general control in the plus or minus 5 ~ 10% t. In order to guarantee the minimum wall thickness can meet the standard requirements and the use of performance, only the appropriate increase wall thickness to solve. So in the same specification, same weight of casing, 5 ~ 10% longer than carbon steel pipe, and even more, this reduces the thousands of meters of penetration casing steel consumption 5 ~ 10%. Even under the same price, ERW casing effect for the user to save the five to 10% of the purchasing cost.

9-5/8 "x 8.94 mm casing, for example, every meters can save 26.8 ~ 53.6 tons, an average savings of $300000.

In 2007, my company's major foreign users is given priority to with Russia's state oil company, oil production area distribution in Siberia in Russia. J55 steel grade oil, casing well depth of 2400 m or so. N80 steel grade oil, casing well depth of 4800 m or so. Part belongs to the production areas and high sulfur, low temperature well geological conditions, the product has no any quality problem happens.

2008 foreign users are mainly composed of Texas oil fields and Russian oil field. Mainly in domestic oilfield, huabei oilfield, daqing oilfield is given priority to. Product scope mainly J55 and N80 steel grade Φ 73.02 mm, 139.7 mm Φ series oil and casing. P110 steel grade slant ladder type fastener Φ 139.7 x 7.72 mm casing in the oilfield using Texas also get good effect, the P110 steel grade slant ladder buckle type casing under the well depth of 5400 m.

Carbon steel pipe should be galvanized anti-corrosion or use the product anti-corrosion coating steel pipe directly buried pipeline

Due to pipe anticorrosion technology lag behind even some carbon steel pipe before no treatment done by corrosion of experience wind and rain, there are a lot of water, gas, natural gas and other metal pipe rust, near the interface is particularly serious, many years of metal pipe is used, is now "with" rotting, interface and the distance between the place of anti-corrosion steel pipe little rust.

Metal pipe joints, about 30 centimeters rust obviously serious, its service life more than any other place in the same period installation of the pipe at least by half, which in turn increases the change of frequency, not only the economic burden, increase users construction also affect people's normal life. Near the interface rust heavily in other places, the main reason is that when cutting thread, processing and installation, destroyed the rust layer on the surface of the galvanized tube, it not only shorten the service life of the metal tube, also laid the security hidden danger. Such as coal gas and natural gas pipelines, serious rust near the interface, easy to cause gas leakage cause safety accidents. Pipe due to rust and blowout, will affect public life. At the top of metal rust, may also hurt people.

China's current of zinc reserves of natural resources in accordance with the existing production capacity, guarantee the mining life is shorter. In today's increasingly scarce resources, zinc is so scarce, we should cherish it with it. Advocate low carbon life, is to make full use of resources. Mild steel pipe caused by man-made destruction, its service life, it's not "low carbon". Zinc has excellent atmospheric corrosion resistance, so the zinc is mainly used for steel and steel structure of the surface coating. According to data shows, since 2003, China's zinc production for 12 years, consumption for six years the highest in the world.

Extend the service life of metal tube near interface of is. Installation of pipes, for surface rust layer of the damaged place, in a timely manner after the completion of coated with antirust paint or glass glue, regular maintenance in the future. This work, it is best done by the contractor, because involves aerial work, user is difficult to operate. Above is a small project, general big engineering will use finished anti-corrosion steel pipe buried pipeline, the pipeline anticorrosion technology is more advanced, anti-corrosion steel pipe use fixed number of year up to 50 years.

Hunan Great Steel Pipe Co.,ltd  is good supplier of coating steel pipe.

Difference of Q345A, Q345B, Q345C Q345D, Q345E

Q is representative of the material yield, 345 refers to the material yield value, minimum to achieve 345 mpa. Q345A, Q345B, Q345C Q345D, Q345E carbon steel pipe. And this is the distinction between grade, represents the main impact of temperature is different,

Q345A, don't do impact;

Grade Q345B, impact is 20 degrees at room temperature;

Grade Q345C, impact is 0 degrees;

Q345D grade, is to rush - 20 degrees;

Q345E level, it is - hit 40 degrees.

In the impact of different temperature, impact value is also different. In the sheet, is a low alloy series. In low alloy material, this material is the most common.

From the point of view of ingredients, the more resistance to low temperature,, P, S control demands were relatively high.

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3 PE anticorrosive steel pipe generally consists of three layers structure

3PE coating steel pipe generally consists of three layers structure:

A layer of epoxy powder di (FBE > 100 um)

Pretreatment quality greatly influence on the performance of the coating. Because of his bad pretreatment in the process of actual coating anticorrosive effect examples of many amounted to less than expected. Especially many excellent anti-corrosion coatings, only strictly according to the requirements of their respective can form normal coating, achieve the desired corrosion protection.

Steel base material must be after cleaning, degreasing, phosphating treatment.

Anti-corrosion coating thickness must be more than the critical thickness, to play a protective role, general is 150 microns to 200 microns.

After such as primer is placed too long to apply paint, will be difficult to adhesion and affect the overall protective effect.

Epoxy powder was coated by electrostatic spraying technology. Due to epoxy powder jinsu processing by adhesion problems, epoxy powder jinsu never can be widely used. In recent years, along with three special coconut epoxy powder jinsu phosphating liquid development success, for the first time the adhesive force of epoxy powder jinsu processing to overcome the difficulties, epoxy powder jinsu began promoting this new process.

Epoxy powder is a kind of thermosetting, non-toxic paint, formation of high molecular weight after curing coating crosslinked structure, with excellent chemical resistance and high mechanical properties, especially abrasion resistance and adhesion best. The coating is 100% solid, no solvent, no pollution, utilization rate of powder can reach more than 95%, is a good anticorrosive coating of buried steel pipeline.

The second floor adhesive (AD) 170 ~ 250 um

Glue (glue, glue, cementation, adhesive) refers to the homogeneous or heterogeneous surfaces connected with adhesive technology, has the stress distribution of continuous, light weight, or seal, most of the low temperature process. Cementing is particularly suited to different material, different thickness, ultra-thin specification and connection of complex components. Adhesive close to generation, the fastest growing industries, and the high and new science and technology progress and improve People's Daily life have a significant impact. Therefore, the research, development and production of various kinds of adhesive is very important.

As solid adsorption of adhesive is to connect the main reason of theory, known as cementing theory of adsorption. Theory is that: the main source of sticky relay is molecular reaction bonding system, namely Fan Dehua gravitational force and hydrogen bond. When the adhesive and glued the distance between the molecules up to 10 to 5 & Aring; Produces mutual attraction, interface between molecules, further shortened the distance between molecules in the da steady state.

According to the calculation, due to the effect of van der Waals force, when two ideal plane distance of 10 & Aring; When the strength of gravity between them can be up to 10-1000 mpa; When the distance is 3-4 & Aring; When can reach 100-100 mpa. This value is much more than modern the strength of the adhesive can achieve the best structure. As a result, some people think that as long as when two objects in contact with good, the adhesive for bonding interface fully wetting, assume that the two values are closely contact plane, and ensure the interface layer on the damage at the same time, the function of intermolecular also can not be guaranteed all the forces between molecules.

The polarity of the adhesive is too high, sometimes can seriously interfere with the wet process and reduce the stick relay. Molecular inter-atomic forces is to provide stick relay factors, but it is not the only factor. In some special cases, other factors can also play a leading role.

Anti-corrosion steel pipe is used adhesive is the use of it between the metal and can produce strong adsorption.

The third layer of polyethylene (PE) 2.5 ~ 3.7 mm

Polyethylene (PE) plastic one, we often mention the convenience bag is polyethylene (PE). Polyethylene is one of the most simple polymer structure, also is the most widely used polymer materials. It is composed of repeat - CH2 - unit connection. Polyethylene is through ethylene (CH2 = CH2) addition polymerization reaction.

Actual operation will be mixed together, three kinds of material processed to that of the steel pipe firmly to form excellent anticorrosive coating. The processing methods of general points spiral wound and circular mould coated type two kinds.

3 PE anticorrosive steel pipe coating (three layers of polyethylene anticorrosive coating), 2 PE anticorrosive coating is to Europe and North America widely used epoxy powder anticorrosive steel pipe coating (FBE) ingenious combination of a new kind of anticorrosive coating steel pipe. Has been recognized and used all over the world already has more than ten years.

3 PE anticorrosive coating of steel pipe is the bottom is in contact with the steel tube surface by epoxy powder anticorrosive coating, the middle layer copolymer adhesive for branching structure with functional groups. Surface for high density polyethylene anticorrosive coatings.

3 PE anticorrosive coating of epoxy resin and polyethylene material high permeability, high mechanical properties, etc. So far, is the world recognized the use effect of the best, the best performance pipeline anticorrosion coating, which has been applied in many engineering.

In three layer structure, the main function of fusion bonded epoxy powder coating is: to form a continuous film, directly bonded with structural steel pipe surface, has the very good resistance to chemical corrosion and cathodic disbonding resistance; Reactive response to form chemical bonding with the middle layer adhesive, ensure that the overall coating has good caking at higher temperatures. The middle layer is usually copolymer adhesive, its main composition is polyolefin, is currently widely used vinyl copolymer adhesive. Copolymer adhesive part polar functional groups and fusion bonded epoxy powder coating epoxy groups can react to generate hydrogen bond or bonds, middle layer and the bottom to form a good bond; Rather than polyethylene vinyl section and surface polarity has the very good close cooperation with, so the middle layer and the surface also has the very good performance. Polyethylene surface is the main function of mechanical protection and anti-corrosion effect, with the traditional polyethylene anticorrosive coating layer structure has the same effect.

3PE COATING STEEL PIPE

3PE COATING steel pipe is a main kind of Anti-corrosion steel pipe,it could protect the surface of steel pipe in avoid of  corrosion of air and water.

3PE coating steel pipe is our advantage product of Hunan great steel pipe co.,ltd.