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Stainless steel elbow won’t produce corrosion, pitting, corrosion or wear and tear. Stainless steel or building one of the highest strength of metal materials in the material. Because the stainless steel has good corrosion resistance, so it can make structure parts permanently maintain the integrity of engineering design. Chromium stainless steel also has high mechanical strength and extensibility, easy processing and manufacturing of parts and can meet the needs of architects and structural designers. All metal and atmospheric oxygen in the reaction, formed in the surface oxide film. Unfortunately, in the ordinary carbon steel formed on the oxidation of iron oxide to continue, kept expanding rust, eventually forming holes. Can use paint or resistant to oxidation of the metal (for example, zinc, chromium and nickel) on plating to ensure that the surface of carbon steel, but, as we know, the protection is only a thin film. If the cover was damaged, the following steel began to rust. Weak corrosive medium such as air, steam, water resistance and acid, alkali, salt and other chemical etching medium corrosion of the steel. Also called acid-proof stainless steel. In practical application, often called the weak corrosive medium corrosion resistant steel stainless steel, and called the resistance to chemical corrosion medium steel acid-resistant steel. Due to the chemical composition on the difference between the two, the former does not necessarily medium resistance to chemical corrosion, while the latter are generally not rust. The corrosion resistance of stainless steel depends on the alloy element content in the steel. Chromium is the basic element to stainless steel for corrosion resistance, while about 1.2% chromium content in steel, chromium and oxygen effect of corrosive medium, in the steel surface to form a thin layer of oxide film (since the passivation film), but to prevent further corrosion of steel substrate. Commonly used alloying elements except chromium and nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., in order to meet the requirements of various applications on the microstructure and mechanical properties of stainless steel. Stainless steel usually according to the matrix was pided into: 1, ferritic stainless steel. Chromium containing 12% ~ 30%. Its corrosion resistance, toughness and weldability with chromium content increases with the increase of chloride stress corrosion resistance is superior to other types of stainless steel. 2, austenitic stainless steel. Chromium is more than 18%, still contain about 8% of the nickel and small amounts of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, corrosion resistant to a variety of media. 3, austenitic, ferritic duplex stainless steel. The advantages of both austenitic and ferritic stainless steel, and has the superplasticity. 4, martensite stainless steel. High strength, but the plasticity and poor weldability. The butt welding elbow calculation formula The calculating formula of butt welding elbow: 1. The outer diameter X – wall thickness wall thickness X0.0387 X 1000 = 90 ° elbow bending radius present theoretical weight For example: 426 x 90 ° 10 R = 1.5 D (426-10) * 0.387 * 10 R600 present 1000 = 96.59 Kg The 180 ° elbow on table 2 times, 45 ° calculated at 1/2; 2. – wall thickness (diameter) X thickness X0.02466 XR multiples X1.57 X = 90 ° bend the theoretical weight of nominal diameter Example: for example: 426 x 90 ° 10 R = 1.5 D (426-10 * 10 * 0.02466 * 1.5 * 1.57 * 400 D = 1.5 Kg The 180 ° elbow on table 2 times, 45 ° calculated at 1/2. Stamping welding elbow is to use the same as the pipe material of sheet in stamping die stamping into half a piece of ring elbow, then two and a half ring bend group for welding. Differ as a result of all kinds of pipe welding standard, usually by groups of some solid semi-finished products factory, site construction according to the welding pipe weld grade, therefore, also known as the butt welding elbow. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

seamless carbon steel pipe is used in industrial applications involving high heat, including process piping, boiling plants, compression stations and refineries. Available Specification API SPEC 5CTProduct nameExecutive standardDimension (mm)Steel code/ Steel gradeCastingAPI 5CT114~219 x 5.2~22.2J55, K55, N80, L80, P110TubingAPI 5CT48.3~114.3 x 3.2~16J55, K55, N80, L80, H40 API SPEC 5L  Product nameExecutive standardDimension (mm)Steel code/ Steel gradeCastingAPI 5L10.3~1200 x1.0~120A, B, X42, X46, X52, X60, X70, X80, PSL1 / PSL2 ASTM / ASME Product nameExecutive standardDimension (mm)Steel code/ Steel gradeBlack and Hot-dipped Zinc-coated Steel Pipes SeamlessASTM A530.3~1200 x 1.0~150GR.A, GR.B, GR.CSeamless Carbon Steel for High Temperature ServiceASTM A10610.3~1200 x 1.0~150GR.B, GR.CSeamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser TubesASTM A17910.3~426 x 1.0~36Low Carbon SteelSeamless Carbon Steel Boiler Tubes for High PressureASTM A19210.3~426 x 1.0~36Low Carbon SteelSeamless Cold-drawn Intermediate Alloy Steel Heat-exchanger and Condenser TubesASTM A19910.3~426 x 1.0~36T5, T22Seamless Medium-carbon Steel Boiler and Superheater TubesASTM A21010.3~426 x 1.0~36A1, CSeamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger TubesASTM A21310.3~426 x 1.0~36T5, T9, T11, T12, T22, T91Seamless Carbon and Alloy Steel for Mechanical TubingASTM A3331/4″~42″ x SCH20~XXSGr1, Gr3, Gr6Seamless and Welded Carbon Steel Pipes and Alloy Steel Pipes for Low Temperature UseASTM A3341/4″~4″ x SCH20~SCH80Gr1, Gr6Seamless Cold-drawn Carbon Steel Feedwater Heater TubesASTM A55610.3~426 x 1.0~36A2, B2 GS Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade eamless Steel Tubes for Elevated Temperature DIN 17175 10~762 x 1.0~120 St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36 Seamless Steel Tubes DIN 1629 / DIN 2391 13.5~762 x 1.8~120 St37.0, St44.0, St52.0, St52.3 Seamless Steel Tubes DIN 2440 13.5~165.1 x 1.8~4.85 St33.2 Seamless Steel Pipes for Structural Purpose DIN 2393 16~426 x 1.0~36 RSt34-2, RSt37-2,  RSt44-2,St52 GS/ DINProduct nameExecutive standardDimension (mm)Steel code/ Steel gradeSeamless Steel Tubes for Elevated TemperatureDIN 1717510~762 x 1.0~120St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36Seamless Steel TubesDIN 162913.5~762 x 1.8~120St37.0, St44.0, St52.0Seamless Precision Steel TubeDIN 23914.0~60.0 x 0.5~8St35, St45, St52Seamless Steel TubesDIN 244013.5~165.1 x 1.8~4.85St33.2

Titanium sponge production process often used stainless steel tube cooler for cooling four titanium tetrachloride, and four titanium tetrachloride contact material for austenitic stainless steel (1Cr18Ni9Ti), and the cooling medium contact material for Q235A steel. The hot side of the casing pipe cooler is welded by 180 degrees stainless steel elbow. In the production process, the casing pipe cooler is often blocked. When removing the cleaning and dredging, it is found that there are many cracks in the inner side of the inner edge of the stainless steel elbow. Causes of cracking: 1, residual stress: stainless steel elbow residual stress is not eliminated, stress in addition to the working stress generated by the load, the residual stress is more from the manufacturing process. Under the action of internal pressure and thermal stress and welding residual stress, the casing tube heat exchanger will have a certain level of tensile stress condition. 2, corrosion environment: in the casing for titanium tetrachloride liquid heat exchanger pipeline, the major media, which also contains ferric chloride, sodium chloride. Due to the double pipe heat exchanger without blowing and discharging device, in the long term parking cause into the air and water droplets, lead to pipeline gathered in the hydrolysis of titanium tetrachloride and blockage of the pipeline, the lower and because chloride containing chloride ions of the material corrosion resistance, led to the acceleration of corrosion. 3, material: tube plate’s pipe material for the 1Cr18Ni9Ti, in the chloride environment is easy to produce stress corrosion, and generally wear crystal fracture. Control measures: 1, the choice of high stress corrosion material: in recent years for the development of a variety of should endure the stress corrosion of stainless steel: high purity austenitic chromium nickel steel, high silicon austenitic chromium nickel steel, high chromium iron prime steel and iron ferrite – austenite dual phase steel. Among them, the resistance to stress corrosion resistance of ferrite austenite dual phase steel is the best. 2, the control of stress: by stabilization after solid solution treatment can eliminate stress, also can obviously improve the material resistance to chloride cracking performance, but consider adopting this method to eliminate the stress should be a good trade-off by sensitization may cause all sorts of problems. 3, strictly comply with the operating procedures: process operation, process conditions on the corrosion of austenitic stainless steel has a huge impact. Therefore, it is necessary to strictly control the media composition, flow rate, temperature, pressure, pH value and other technical indicators. Adding corrosion inhibitor to the range of process conditions. 4, maintenance and management: to ensure the long-term safe operation of the heat exchanger casing type heat exchanger should be strict implementation of regulations and laws and regulations related to heat exchanger, the defects must be reexamined, timely grasp the operation of defects in the development of the situation, take appropriate measures, reduce equipment corrosion. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

When it comes to the steel pipe, we know little knowledge on how to measuring the hardness of steel pipe whatever the types of pipe are. The hardness is an important factor when customers are willing to purchasing steel pipe. Today, our technical team will teach you some methods how to measure the hardness. How To Measure Hardness Of Steel Pipe? The hardness testing is based on the mechanical properties including the feedstock on performance and quality for the steel pipe deformed by stamping or cutting. There are two ways for the mechanical properties test of steel pipe: tensile test and durometer hardness test.  Tensile test is generally measured the tensile strength and elongation and necking rate of the steel pipe. The steel pipe sample is pulled to fracture on tensile testing machine to check one or several mechanical properties. Metal raw material is determined the basic mechanical properties. As long as the mechanical properties required, the metal material has predetermined the tensile test of the steel tube. The tensile test is very inconvenient for the hardness measurement of the work piece, but it is only way to test mechanical properties.  The durometer hardness test requires pushing the pressure head of hard conditions into the workpiece surface slowly to measure indentation depth and size that is the hardness of material subsequently. electronic cigarette manufacturers The hardness test is not only the most convenient means in the detection of mechanical properties but also non-destructive testing. Due to inconvenient tensile test, the hardness conversion to strength is very easy. So you only test the hardness of the material of the steel pipe.

A bevel is a surface that is not at a right angle (perpendicular) to another surface. The standard angle on a pipe bevel is 37.5° but other non standard angles can be produced. Beveling of pipe or tubing is to prepare the ends for welding. However, it can also be used for deburring the cut ends for safety or aesthetic reasons. Bevel End is abbreviated on drawings as BE. This is the most commonly used end and is used on pipe, pipe nipples, and swage nipples. Why bevel a pipe? Beveling of pipe or tubing is most commonly used to prepare the ends for welding.  It can also be used for deburring the cut ends for safety and aesthetic reasons.

Bright annealing tube under a reducing atmosphere or in a vacuum protection, after high temperature solid melting and rapid cooling to get the stainless steel tube, requiring the inner surface has a very good surface roughness and cleanliness, is a comprehensive consideration of organizational stability corrosion resistance and workability of the pipe. Bright annealed tube inner surface roughness Ra values ​​and their own cleanliness is extremely demanding, so the particles can occur during transport and accumulation of fluid retention has been effectively curbed. In addition, the chemical composition of the pipe and the base material dimensional tolerances need to be strictly controlled to ensure the weldability of steel and the welding quality in the welding fumes, which can reduce the occurrence of particle generation and improving the corrosion resistance of welded parts, and smoothness.  Bright annealing tube production control: Smelting raw materials must have good control, the level required to meet the microstructure times better level. Cold rolling volume control and reasonable within the organization in order to avoid defects. Mold control, to ensure the inner and outer surface roughness R a ≤ 0.3μm. Bright annealing control to ensure reasonable mechanical properties and surface brightness, and eliminate the pass mechanical polishing (MP), to ensure the smoothness of the inner surface under microscopic state, to avoid transmission fluid residues. Cleaning the control surfaces should have the products delivered better cleanliness and cleanliness, with metallic colors, no oil adhesion, oxide adhesion. Single hats loss prevention bagging, overall braid or wooden packaging. The material of the stainless steel round bar is from Jiuli and Baosteel China, we control the quality from the very start. We polished three times to make sure the surface is perfect bright and smooth, and without any deficiency in quality. We have precision equipment to test according to the standard required and PMI test to check the material before delivery.

The alloy steel pipe adopts high quality carbon steel, alloy structural steel and stainless & heat resisting steel as raw material through hot rolling or cold drawn to be made. The main applications of alloy steel pipe is power station, nuclear power plant, high pressure boiler, high temperature superheater and re-heater coil etc. of high temperature pipeline and equipments. The material of alloy steel pipe is roughly: 16-50 mn, 27 simn, 40 cr, 12-42 crmo 16 mn 12 cr1mov T91 27 simn 30 crmo 15 crmo 20 g Cr9Mo 10 crmo910 15 mo3 15 35 crmov 45 crmov crmo, 15 crmog, 12 crmov, 45 crnimo 45 50 cr, cr, etc. Heat Resistance Some nickel alloys can endure extreme conditions and high temperatures. For example, nickel-chromium alloys that are comprised of over 15% chromium have been used at temperatures that can exceed 760 celsius. This ability to withstand heat makes nickel alloy pipe a go-to material in machines or structures that produce extreme temperatures. Corrosion Resistance When metals encounter oxygen, they can undergo oxidation reactions. This, in turn, causes corrosion. Nickel, however, has a slow rate of oxidation, making nickel alloys more resistant to corrosion than most metals. This allows them to maintain their integrity for longer than other metals, especially in marine environments where corrosion is particularly problematic. Low-Expansion Some nickel-iron alloys have an extremely low rate of thermal expansion or a very consistent and predictable pattern of expansion in specific temperature ranges. This makes them useful when you need a pipe that can maintain a uniform shape and size despite hot environments. For example, Iron-36% nickel alloy almost doesn’t expand at all during moderate changes in temperatures. And when you add cobalt to the nickel and iron, you get a high-strength alloy that has a constant modulus of elasticity and a low coefficient of expansion. Shape Memory Sometimes, a metallic material is needed that can return to its previous shape when it experiences heat. This type of material is called a shape memory alloy, and there are very few available on the market. Some nickel alloys, however, have this characteristic, with nickel-titanium alloys being one of the most prominent shape memory alloys. Magnetic Permeability Nickel-iron alloys also have unique and interesting magnetic permeability characteristics. This has allowed them to become an integral component in designs for switchgear as well as direct current motors and generators. These advantages have made nickel alloys a popular material in a number of applications, including: • The petrochemical industry • Aircraft turbines • Medical engineering • Steam turbine power plants • Nuclear power plants The advantages of alloy steel pipe: 100% recycled, it is suitable for the national strategy of environmental protection, energy-saving and resource-saving. Therefore, the national policy encourages the expansion of the high pressure alloy steel pipe applications. At present, the proportion of the total alloy steel tube is half of the developed countries. The applications of alloy steel pipe provide a broad space for the industry development. According to the research of the China association of special steel alloy pipe expert group, our country’s high pressure alloy steel pipe material demand grows by an average of up to 10-12%.

How to identify the authenticity of stainless steel pipe? There are four ways to identify the authenticity of stainless steel pipe. One, Magnetic test is the most simple way to distinguish between annealed austenitic stainless steel pipe and ferrite stainless steel pipe. Non magnetic steel is austenitic stainless steel, but the high pressure after cold working with mild magnetic; and pure chromium steels and low alloy steels is strong magnetic steel. Two, One of the remarkable characteristics of the stainless steel pipe is that the corrosion resistance of concentrated nitric acid and dilute nitric acid is inherent. This property makes it easy to distinguish from most other metals or alloys. However, the high carbon type 420 and 440 steel in the nitric acid point test is slightly affected by corrosion, non-ferrous metals encountered when concentrated nitric acid will be corroded. And dilute nitric acid has strong corrosive to carbon steel. Third, sulfuric acid copper sulfate test copper test is fast to distinguish between ordinary carbon steel and all kinds of stainless steel is the most simple method. The concentration of copper sulfate solution was 5~10%. Before the test, the test area should be thoroughly cleaned of oil or various impurities, and polishing cloth polishing a small region, then dropping to clean up after the regional drop note copper sulfate solution. Ordinary carbon steel or iron within a few seconds will form a layer on the surface of copper, and the surface of the stainless steel pipe does not produce copper precipitation or copper color. Four, sulfuric acid test sulfuric acid immersion stainless steel pipe test can be 302 and 316 and 317 and 304 to distinguish. The cutting edge of the sample should be finely ground, then the volume concentration of 20~30%, temperature of 60~66 c c c (1.42) in the proportion of clean and passivation for half an hour. The volume concentration of sulfuric acid test solution was 10%, heated to 71 degrees when.302 and 304 stainless steel immersed in the hot solution, rapid corrosion and a large number of bubbles, sample within a few minutes of black; and 316 and 317 stainless steel specimens is not subject to corrosion or reaction is very slow (bubble) sample in 10 to 15 minutes do not change color. It can make the test more accurate if the test specimen with known composition is used to make an approximate comparison. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel pipe is a hollow round steel, mainly widely used in petroleum, chemical, medical, food, light industry, machinery and instruments and other industrial transportation pipeline and mechanical components, etc.. In addition, the bending and torsion strength of the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structure. Also used for production of various conventional weapons, artillery barrel, etc.. Safety, health, environmental protection, economy applicable, the successful development of thin wall of the pipe and new, reliable, simple and convenient connection method the with more other pipe irreplaceable advantages of stainless steel tube, the engineering application will be more and more, the use will become increasingly popular, a good prospect. With the implementation of China’s reform and opening up policy, the rapid growth of the national economy, urban residential, public buildings and tourism facilities to build a large number of hot water supply and domestic water supply put forward new requirements. In particular, water quality problems, people pay more and more attention to, the requirements are also constantly improving. Galvanized steel pipe is a common pipe because of its easy corrosion, under the influence of the relevant national policies, will gradually withdraw from the stage of history, plastic pipe, composite pipe and copper pipe into a common pipe system. But in many cases, more superior stainless steel tube, especially wall thickness of only 0.6 ~ 1.2mm thin-walled stainless steel tube placed in the priority of the water supply system in the high quality drinking water system, hot water systems and the safety, health, has the characteristics of safety, health, environmental protection, economical and applicable. Engineering practice at home and abroad has been proved to is one of the water system performance best, a new, energy saving and environmental protection type of the pipe, but also a very competitive in the water supply pipe is bound to improve water quality, improve the living standards of people to play an incomparable role. In building water supply pipe system, due to the galvanization steel tube is over a hundred years of glorious history, a variety of new plastic pipe and composite pipe obtained rapid development, but all tubing also different degrees exist some deficiencies, far can not fully meet the needs and the State Department of drinking water and the water quality requirements of water supply pipe. Therefore, the experts predict: building water supply pipe will eventually return to the era of metal. According to foreign experience, in the metal tube in the determination of thin-walled stainless steel pipe as one of the best performance of the pipe.

A hydrostatic test is a way in which pressure vessels such as pipelines, plumbing, gas cylinders, boilers and fuel tanks can be tested for strength and leaks. The test involves filling the vessel or pipe system with a liquid, usually water, which may be dyed to aid in visual leak detection, and pressurization of the vessel to the specified test pressure. For hydrostatic testing purposes, there are two: one is the process of hydraulic test to test whether the leaking pipe, that test tube sealing performance; Another is confirmatory hydrostatic test to test the strength of steel adequacy. In general, low and medium pressure boiler pipe hydrostatic test is part of the process of the hydrostatic test, which is the density of material testing and inspect and whether the material is a continuous dense; it is not verify the strength tests. From the intensity of mechanics of materials theory, seamless steel components are thin and long, and its diameter is very small, even for thin-walled capillary tubes can withstand great pressure. That is to say, when low and medium pressure boiler tubes test pressure, even when there are deep cracks, can not happen leaking. Hydrostatic test is that many product specification test methods are available. This test can detect leakage of liquid from the inner wall of the case outward can be observed with the naked eye or with a pressure drop to determine. Hydrostatic test can not be found through-wall defects but very close or very close to the wall thickness in depth but not yet fully penetrated defects. Conducted for each pipe eddy current inspection after the low and medium pressure boiler pipe hydrostatic testing is not necessary to replace the hydrostatic test eddy current testing. Hydrostatic testing of Steel pipe is as follows: test section at the end of block, slow water injection, the tube gas discharge. after the steel tube filled with water, water tightness checks. made slow progress in steel pressure appropriate USES manual pump, booster time should not less than 10 min. stop pressure after test pressure, observe the 10 min, must not exceed 0.02 MPa pressure drop; Then put the testing pressure drop to the working pressure, steel pipe for visual inspection, leak-proof is not qualified. after arrival, steel pipe pressure, leakage and pressure drop more than a specified value, check the steel tube, after the reason to discharge the leakage, as stipulated in the above to test again, until it meets the requirements. the temperature is lower than 5 ℃ under the environment of water pressure and water capacity, reliable antifreezing measures should be taken, after the test, water should be put. Hydrostatic testing of Pipeline Hydrotesting of pipes, pipelines and vessels is performed to expose defective materials that have missed prior detection, ensure that any remaining defects are insignificant enough to allow operation at design pressures, expose possible leaks and serve as a final validation of the integrity of the constructed system. ASME B31.3 requires this testing to ensure tightness and strength. Buried high pressure oil and gas pipelines are tested for strength by pressurizing them to at least 125% of their maximum allowable working pressure (MAWP) at any point along their length. Since many long distance transmission pipelines are designed to have a steel hoop stress of 80% of specified minimum yield strength (SMYS) at MAOP, this means that the steel is stressed to SMYS and above during the testing, and test sections must be selected to ensure that excessive plastic deformation does not occur. Test pressures need not exceed a value that would produce a stress higher than yield stress at test temperature. ASME B31.3 section 345.4.2 (c) Other codes require a more onerous approach. BS PD 8010-2 requires testing to 150% of the design pressure – which should not be less than the MAOP plus surge and other incidental effects that will occur during normal operation. Leak testing is performed by balancing changes in the measured pressure in the test section against the theoretical pressure changes calculated from changes in the measured temperature of the test section. Australian standard AS2885.5 “Pipelines—Gas and liquid petroleum: Part 5: Field pressure testing” gives an excellent explanation of the factors involved.

Marine Seamless Steel Pipe is very common in marine engineering. Two systems of ship and marine engineering demand roughly in three types of steel pipe: steel pipe in the conventional system, constructed with steel pipes and special purpose steel pipes. Steel pipe in the conventional system Different ship and marine engineering, both conventional systems have a dedicated system. Ship service life of 20 years. Many of the conventional system, bilge water, ballast, dewater sewage, air, measurement, injection, domestic water, fire, cargo oil stripping, breathable, inert gas, heating, washing, foam extinguishing sprinkler, vapor, liquid level telemetry, valve remote control systems, special ships also include a dedicated system for the transportation of liquefied petroleum gas (LPG), liquefied natural gas (LNG). Marine engineering service life of up to 30 years, or even longer. Marine engineering in addition to the conventional system, special drilling equipment systems, crude oil / LPG / LNG processing workflow system, special mooring system, flare system, and so on. It has been statistics, ship pipe annual consumption of 450 million tons, about 440,000, its standards are GB, YB, CB, 70% of the steel pipe connection. Only a 30-ton very large crude oil pipes for the amount of up to tens of kilometers, only steel pipe usage (including), there are about 1,500 tons, of course, the amount of 40,000 tons relative to the hull structure or limited. In addition, taking into account the same ship, to the construction of ships, as well as many other ships, so the cumulative dosage is also a lot of. And a 300,000 tons-class number of large FPSO pipe over 30,000, more than 90 km in length, which is the same tonnage level 2 to 3 times. Therefore, the shipbuilding industry has become a big user of steel pipe market. Steel pipe in construct Steel tube marine engineering applications, in addition to the above conventional system with a dedicated system, many constructed a large number of steel pipes, such as jacket, underwater steel piles, Casing, mooring bracket, helicopter platform, torch tower. Type of steel pipe, material specifications, with the same diameter, reducers, different wall thickness, as well as a large number of Y, K, T-managed nodes. Such as jacket, steel piles, wellhead impermeable sleeve, mostly large diameter steel pipe sizes, are generally made of rolled steel. Their material for E36-Z35, D36-Z35, E36, D36. Such steel pipe standards have not with YB, CB, and mainly is GB712-2000. The production of steel pipe structure steel pipe manufacturing practice SY/T10002-2000 developed by China’s Petroleum Industry Standards and Technology Commission (CPSC). Since China does not have the specialized enterprises, are usually the purchase of steel plate from construction units, self-molding process. Steel pipe for special purpose Special purpose steel special steel pipe used in the specific working environment and the working medium. Undersea pipeline is typical specialty steel pipe, the demand for larger, high strength, small tolerances, good corrosion resistance. Currently, the pipeline production is only in its infancy, because the welding materials, corrosion resistance or less Specifications (diameter and wall thickness), expensive, etc. China’s offshore crude oil need insulation transport. The past, using the double pipe insulation structure, safe and reliable. But as a protective pipe steel pipe is very economical, and offshore pipe laying ago, have to carry out internal and external pipe welding, greatly reducing the efficiency of the pipe laying, to cause installation costs increase exponentially. Into the 21st century, it has launched a concrete counterweight steel pipe. Its structure is (from inside to outside): anti-corrosion layer of steel, epoxy powder (FBE), polyurethane insulation, polyethylene (PE) jacket tube, reinforced concrete counterweight layer (the internal configuration of the steel mesh). This type of special steel, China has imported from abroad, such as the Bohai Penglai 19-3 oil field, a project using Malaysian BREDEROPRICE company products. China after research and testing, and in 2002 built in Tanggu, China’s first concrete with heavy steel pipe production line, has thousands of kilometers of pipelines for offshore oilfield products. It is reported that, using this steel per kilometer subsea pipeline to reduce the cost of 50 million to 100 million, and greatly reduce the cost of offshore oilfield development, so that a number of marginal oil fields to be cost-effective to develop.

Stainless steel angle bar is mainly pided into sides stainless steel angle bars and sides stainless steel angle bars two categories, which not sides stainless steel angles and pided into equal thickness and equal unequal thickness two. Stainless steel angle bar specifications expressed by the side and edge thickness size. At present domestic stainless steel angle bar specifications for 2 – 20, to the length of a few centimeters to unsigned, with stainless steel angle bars often 2 – 7 kinds of different edge thickness. The actual size and edge imported stainless steel angle bar marked on both sides of the thickness and indicate the relevant standards. General length of 12.5 cm above for large stainless steel angle bars and medium-sized stainless steel angle bar between 12.5 cm, 5 cm, length 5cm below for small stainless steel angle bars. The import and export of stainless steel angle bar orders to use commonly required in the specification, the steel is carbon steel steel corresponding. The stainless steel angle bar in addition to standard number, no specific composition and performance series. Stainless steel angle bar delivery length. Length, double length two, domestic stainless steel angle bars set feet range 3 – 9m, 4 – 12M, 4 – 19m, 6 – 19m four range according to different specifications, respectively. The Japanese production of stainless steel angle bar length ranges from 6 to 15m. Scalene stainless steel angle bar section height according to the long side of the equilateral angle bar to calculate the width of stainless steel.