Tianjin Xinyue Steel

A grade of   stainless steel,   304 steel is the most widely used steel because it's easy to weld and work. It is available in a wider range of stock forms and finishes than any other steel product. The 304 stainless steel is classified as a T 300 series austenitic stainless steel alloy, containing a minimum of 8 percent nickel and 18 percent chromium with a maximum of 0.08 percent carbon. This grade of steel also has excellent drawing properties and can be formed into bar, rod or sheet stock. It comes in a low-carbon version, commonly used in heavy-gauge equipment because it does not require annealing. There is also a high-carbon version, suited to applications in which the steel may be exposed to high temperatures. The heat resistance of 304 steel is good in ranges up to 925 degrees C for continuous use, and it also can withstand extreme cryogenic temperatures. It is very corrosion-resistant and can be exposed to a variety of atmospheric conditions and a wide range of...

Steel tube   is used in a variety of structural and industrial applications, such as automobile transport, architecture, and construction. These steel tubes are made of different steel structures, from stainless steel, carbon, zinc or soft steel, depending on the application requirements. Steel tubing is divided into two classes: mechanical and structural, depending on its design. So what is the difference between mechanical and structural steel tube? Below are some points to consider while differentiating the two types of steel tubing. The comparison is made on the basis of application, specification, and shape. Comparison between mechanical and structural steel tube Application: Mechanical tubing is used in low stress and light gauge structural applications. These applications include conveyor belt components, solar panel supports, greenhouse structures, kitchens and restaurants, hospitals and medical equipment, and various types of industrial machinery. Structural tubin...

Seamless stainless steel pipes are the preferred choice for high-temperature applications across industries due to their several superior properties. They possess greater strength under loading, exhibit exceptional corrosion resistance, can withstand shocks and vibrations, and offer reliable performance even under the toughest and harsh conditions. Due to these benefits, seamless stainless steel tubes and pipes are used in heating-pipelines, containers, coal-saving devices, super-heaters and repeaters, high press boiler, heat exchanger and condenser tubes, mechanical and structural tubing, among several others. This post discusses the various material grades of stainless steel used for producing these   seamless pipes   and tubes. Grades of Stainless Steel Used in Producing Seamless Tubes and Pipes Steel tubes and pipes used for the high-temperature applications must be of superior quality to resist high temperatures ranging from 400 degree Celsius to 1100 degree Celsiu...

Standard would be an important factor for customers when they choose steel pipe no matter   seamless steel pipe , or welded steel pipe. And for every order, we'll provide a MTC to you before delivery. Here is it: ASTM A252 LSAW steel pipe-Fluid Transportation Pipes: Additions: Thickness: 6-60MM Size: 310-1420mm Material: Q195,Q215,Q235,Q345(B,C,D,E) Certification: API ABS CE ASTM A671 / A672 CL10-CL13-Fluid Transportation Pipes: Out Diameter: 323.9mm -1820mm(12''-72'') Wall Thickness:5.0 - 50mm Length:6 – 12m ASTM A53 LSAW steel pipe-Fluid Transportation Pipes: Out Diameter: 323.9mm -1820mm(12''-72'') Wall Thickness:5.0-50mm Length:6–12m ASTM A179, ASTM A192, ASTM A210 of Seamless Steel Pipe-Carbon Steel Pipe: Standard: American society of mechanical engineers ASME SA 179,ASME SA 192,ASME SA 210; American society for Testing and Materials ASTM A179M,ASTM A192M,ASTM A210M Uses: For manufacture wall panel, eco...

In the hydrostatic test of erw tube, it is often found that the bursting opening breaks from the weld of the erw tube, which indicates that the strength of the weld site is lower than that of the base metal. Through experimental analysis, it has been found that if an internal scratch groove is formed on the inner surface of the   steel pipe   during the removal of the burr in the weld, the wall thickness of the sample at the weld site is reduced. In the tensile test, the sample can easily break from this point. . The water pressure test of the water supply pipeline is the means for the final quality assessment of the erw tube laying. Generally, we have two requirements for the hydrostatic pressure test: First, it must be able to correctly reflect the pipeline leakage; second, pressure test when there is no problem, nor can the interface suffer damage due to pressure test. Instead, it will affect the quality of the project, or rework to retry, resulting in waste, and even ...

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-corrosion steel pipe in the country is mainly used for petroleum, chemical, gas, heat, sewage treatment, water, bridges, steel pipes and other engineering fields. Anti-corrosion steel pipe is divided into the following categories: IPN8710 corrosion, FBE epoxy powder corrosion, 2PE/3PE corrosion, Coal tar epoxy anticorrosive, High-density polyethylene jacket corrosion The 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. In the liquid epoxy coating guards against corrosion the steel pipe to be suitable for transportation crude oil, wate...

What are the possible causes of stress concentration in welded joints? a. Process defects in the weld, such as pores, slag inclusions, cracks, and incomplete penetration, where the stress concentration caused by cracks and incomplete penetration is severe. b. Unreasonable weld seams, such as butt weld seams that are thicker and oversized, can create significant stress concentrations. c. Unreasonable design of welded joints, such as abrupt changes in the cross section of the joints, butt joints with cover plates, etc., can cause serious stress concentrations. Improper welds may also cause stress concentration. What are the adverse effects of stress concentration on the welded structure? how to improve? 1. Excessive stress may even cause cracks in the solder joints, causing potential safety hazards. 2. Deformation of components, such as the rack of some equipment, will be processed before the stress is not eliminated. In the subsequent use process, it cannot be used due to...

Submerged arc welded pipe welds are butt joint welds. If you do not control the weld height and corner radius, the stress at the weld toe is so great that the welded pipe is in service, especially in corrosive media such as H2S aqueous solution. , seawater, marine atmosphere, etc., easy to produce stress corrosion cracks at the weld toe. In the process of forming and welding, the welded pipe inevitably generates residual stress, so the residual stress is eliminated after the pipe blank is formed and welded. The expansion can eliminate the residual stress, but the residual stress is difficult to eliminate completely, and the residual stress at the weld toe cannot be eliminated. In order to prevent stress corrosion cracking at the weld toe, it is necessary to control the residual stress during molding and welding, especially the residual stress at the weld toe. Check www.tjxysteel.com for more info. Contact Email: marketing@xysteelpipe.com .

The total zinc coating condition applied depends mainly on the mass and thickness of the galvanized steel tubing. Usually the surface of the galvanized layer should be complete and uniform and with a standard thickness. The evaluation of the appearance quality of the galvanized layer is very important. The following listed the common surface conditions of the galvanizing layer for   galvanized steel pipe . 1. Gray and dark-gray cobwebbing The chemical elements of the steel tube such as C, Si, P and Mn will cause Fe-Zn alloy reaction with the increase of the content, produced zinc-iron alloy layer on the coating surface, especially with Si increased, which accelerate the reaction of iron-zinc melt mutually, formed on the surface of gray even the black net. The black coating layer is thicker than the bright coating, the corrosion protection and prevention ability completely inferior to the bright coating, but will be more resistant to corrosion but may not pretty sensually. Ho...

According to the API, the oil and gas industry can have reference standards for its industry.Under the general standards, there are some subordinated specifications drafted for each specific OCTG product, such as API 5B, API 5CT, API 5D, API 5L and so on. API 5L covers seamless and welded steel line pipe. It provide specification for pipe used in conveying gas, water, and oil in both the oil and natural gas industries. It includes standard-weight and extra-strong threaded line pipe; and standard-weight plain-end, regular-weight plain-end, special plain-end, extra-strong plain-end, special plain-end, extra-strong plain-end pipe; as as well as bell and spigot and through-the-flow line(TFL) pipe. Grades covered by API 5L are A25, A, B (and the following "X" Grades), X42, X46, X52, X56, X60, X65, X70, X80. The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade. API 5B and 5CT are mainly used...

Due to the different amount of zinc, there are three types of   galvanized steel pipe   which divided into Pre-painted, Cold-dipped galvanized and Hot-dipped galvanized. And which kind of influence for the different amount of zinc in galvanized steel pipe? The specific zinc amount in galvanized steel pipe: 1. Pre-painted (zinc: 60-120G/M2); 2. Cold-dipped galvanized(zinc:10-50G/M2). 3. Hot-dipped galvanized (zinc: 120-500G/M2); From the list above, we can see that details for zinc amount in galvanized steel pipes. Generally speaking, if there is low zinc content, and scattered capacity is good, but the current efficiency decline. Under this situation, we should decide the zinc amount carefully for the consideration of the function for different types of galvanized steel pipe. Check www.tjxysteel.com for more info. Contact Email: marketing@xysteelpipe.com .

Corrosion is the main factor affecting the life and reliability of offshore and onshore pipelines. Epoxy coatings offer excellent resistance to high temperatures, chemicals and corrosion. Oil and gas protective coatings can be divided into two separate categories, each with its own unique and demanding requirements: external coatings and internal coatings. When referred to anti-corrosion, people naturally think of the external anti-corrosion, such as three layer polyethylene systems(3LPE) and three polypropylene layer(3LPP), but the internal pipeline coating is as the same important as external coating for protection of the pipeline. Oil and gas fluids contain solid particulates such as sodium chloride, potassium chloride, other salts, carbonates, sulfates, partially polymerized oils, including waxes silicas as well as dirt .Some of these particulates dissolve in the fluid while some remain in suspension. Traveling through pipelines at speeds approaching 200 mph, these particula...

OCTG pipe refers to Oil Country Tubular Goods, a collection of rolled metal products, more commonly known as drill pipe, casing and tubing which are manufactured according to API specification. It used both onshore and offshoreiIn petroleum industry. Drill pipe is a seamless tube that rotates the drill bit and circulates drilling fluid. It is hollow to allow drilling fluid to be pumped down the hole through the bit and back up the annulus. The annulus of an oil well is the space between any piping tubing or casing and the piping, tubing or casing immediately surrounding it. The presence of an annulus gives the ability to circulate fluid in the well. Drill pipe is subjected to high torque by drilling, axial tension by its dead weight and internal pressure by purging of drilling fluid. Tubing is the pipe that goes inside the   casing pipe . This is the pipe that the oil itself will eventually make its way out of. The most simplistic of the OCTG family, tubing pipes can usually...

In long distance conveyance of crude oil, natural gas or refined oil, the pipeline usually need to be buried underground. When steel pipes or pipe fittings are in contact with soil and waters, we must consider its external anti-corrosion performance to ensure a durable lifespan of the pipeline. The three layers Polyethylene(3PE/3LPE) external coating perfectly solves this problem. It consists of a high performance fusion bonded epoxy(FBE) layer, an adhesive layer and an outer layer of high density polyethylene. The three layers external coating has excellent resistance to abrasion, wear, acid, alkali and cathodic disbonding, etc. It is the preferred choice for transmission of oil and gas around the world. It can withstand varied temperatures and enviroments ranging from dessert dry lands to deep underwater regions. 3lpe coated steel pipe are uesd for transportation of drinking water. Oil and gas and other fluids. The 3LPE coated pipes can be used in the high temperatures as high a...

In long distance conveyance of crude oil, natural gas or refined oil, the pipeline usually need to be buried underground. When steel pipes or pipe fittings are in contact with soil and waters, we must consider its external anti-corrosion performance to ensure a durable lifespan of the pipeline. The three layers Polyethylene( 3PE /3LPE) external coating perfectly solves this problem. It consists of a high performance fusion bonded epoxy(FBE) layer, an adhesive layer and an outer layer of high density polyethylene. The three layers external coating has excellent resistance to abrasion, wear, acid, alkali and cathodic disbonding, etc. 3LPE coated pipes consist of 3layers for pipeline coating. Layer 1(FBE>100um consists of fusion bonded epoxy. This layer protection against corrosion and is fusion with the blasted steel surface. Layer 2 (170～250um) is copolymer adhesive which has excellent chemical bonding to the inner layer and the top layer of polythylene Layer 3 (2.5～3....

Seamless steel pipes are mainly used in oil pipeline and gas pipeline, but seldom used in oil pipelines with long-distance. Most long distance pipeline applied  ERW pipes ,  SSAW pipes  and LSAW pipes. Here are comparisons of technological features and performance of these pipes. 1. Spiral Submerged-Arc Welding Pipes Spiral submerged arc welded (SSAW) pipes has spiral welding joints and the pipes are welded and formed at the same time. The strip steel with the same specification can produce SSAW pipes with various diameters. The welding joints can avoid major stress and have better force resistance. Disadvantages are poor geometrical diameters; longer welding joints and joints are easily to have cracks, porosity and other welding defects. According to the design specification of oil and gas pipeline, SSAW pipes only can be used in the third and fourth class areas. Developed countries have improved the technology, apart forming and welding, and have pre-welding and ...

Galvanized steel pipe  is steel with a protective zinc coating. This coating has many advantages over other ways used to protect steel, and it makes galvanized steel pipe, fittings and other structures more desirable in many situations. Here are some of the advantages associated with using galvanized steel. 1. Low Initial Cost The galvanization process usually costs less than other popular methods of protecting steel. This is because the other methods are often labor intensive, and the cost of labor is always increasing. Galvanization requires less manual labor, and therefore has not been been affected by this increase. 2. Long Life The main benefit of galvanized steel is its long life. Galvanized steel pipe, fittings and other structures can last more than 50 years in many rural areas, and more than 25 years in severely exposed urban and coastal environments. 3. Toughness The unique metallurgical composition of a galvanized coating makes it very rugged. Therefore, g...

The difference between seamless steel tube and straight seam welded pipe in hot tension is as follows: 1, The quality of the weld directly determines the quality of the welded pipe, but also the biggest difference between the welded pipe and the seamless steel tube. After the high-frequency welding of straight seam welded pipe, the carbon in the straight seam cannot be eliminated. The weld seam and the parent body are only joined together. They are not completely melted and cannot stand the test of time and high pressure. After the high-frequency welding, the hot tension reducing steel pipe also undergoes an overall heating of 800 degrees and the whole annealing, and then carries out the open-change treatment. After this series of processes, the properties of the weld and the mother structure are the same and completely melted into one body. , well done from the seam to the seamless transition. 2, The difference in the process caused the difference in product quality, hot tensio...

With the same condition of alloy composition for a steel pipe, the good quality or bad quality of steel pipe, to some extent, would depend on the corrosion resistance. Today, as supplier of  seamless steel pipe ,  ERW steel pipe , Xinyue Steel would have an analysis for steel pipe. First, same chemical composition, same heat treatment, with same standard of steel pipe, the corrosion resistance would be consistent. Second, tests shows that the steel pipe welding has the equal or better corrosion resistant compared to the metal to be welded. In addition, in acid circumstance, incomplete heat treatment accelerates corrosion at the weld, but this only requires a corrosion test. Final, for bending and tensile test. We know that they are important for bending and tensile in engineering project. Weld seam extension can be verified by the following tests: ASTM 45 degree bending followed by 90 degree and then flattening along the weld seam. Check www.tjxysteel.com for...

With the improvement on technology of   ERW steel pipe   making and   SMLS steel pipe   production, we know the difference is narrow down. However, there is still detailed difference we should focus on when we purchase it. Precision: ERW steel pipe has smaller deviation than seamless steel pipe in diameter and wall thickness in precision. Due to the rolling difference and pipe forming technology. Thus we should choose the steel pipe according the precision requirement. Mechanical properties: Talking about the heating treatment, controlled rolling, we should figure out that welded steel pipe has advantages to achieve those demands during the production. For example, Longitudinal welded pipe’s elongation of 8% to 10% which is higher than the seamless pipe, mainly vertical welded pipe carbon ratio of about 1/2 of seamless steel pipe. Check www.tjxysteel.com for more info. Contact Email: marketing@xysteelpipe.com .

Boiler tube includes medium pressure boiler tube and high pressure boiler tube. It is usually made of seamless process and welded steel tube is not applicable.It has been widely used at heat exchanger pipe and tubing services, tube exchanger bundle, high pressure boiler, economizer, super heater, petrochemical industry pipes, etc. Based on different working temperature, the medium or high pressure boiler pipe shall be used. Normally classified as below cases: 1. The operation temperature of general boiler pipe is lower than 450℃. The medium pressure boiler pipeline mainly adopts hot rolling process or cold drawing process. 2. High pressure boiler pipes are often used in high temperature and high pressure conditions. Under the action of high temperature flue gas and steam, the pipe will occur oxidation and corrosion. It is required high pressure boiler pipe that has high durable strength, high oxidation corrosion resistance and good tissue stability. Check www.tjxysteel.com...

Metallographic analysis of the seamless tube includes high magnification test and low magnification test. High magnification test A high magnification test is a method of evaluating the internal structure and defects of a material through a microscope. The high-power test items that are usually performed on seamless tubes include: microscopic evaluation of non-metallic inclusions in steel; determination of average grain size; determination of decarburized layer depth; micro-structure inspection. Seamless tubes Currently, the assessment of non-metallic inclusions in steel is generally performed at a magnification of 100 times the field of view. The seamless steel tube compares the most serious field of inclusions in the sample with the standard level map to evaluate inclusions in the steel. The level of things. Non-metallic inclusions are graded according to the A method in GBIP 10561, which can be classified as: Type A monosulfide type; Type B-aluminum oxide type: Type 17 mo...

Requirements of high pressure steel pipes' installation is similar with low pressure pipe's. However, as steel pipes supplier, for instance,  SSAW steel pipe ,  seamless steel pipe , ERW steel pipe, Tianjin Xinyue Steel Group knows that there are detailed difference should be pay attention to for the installation of high pressure pipe's installation. First of all, fittings, fasteners and valves should be checked before the steel pipe’s installation. As far as concerned, we know that these parts may be ignored, however, they are important part during the whole installation. Second, relative technical files should be transported properly to the scene for guidance of the installation. As we all know, even for engineers, they should follow the instruction in the explanation to have the right installation in special places. In addition, inner and out surface should be clean up before the installation. Clear parts would have a better adhesiveness for the steel pipes. ...

Prepainted galvanized steel coil made of hot-dip galvanized sheet, hot-dip aluminum zinc plate, electro-galvanized sheet, after surface pretreatment (chemical degreasing and chemical conversion treatment). Prepainted galvanized steel coil is coated with layers of organic paint, and then baked, through the curing process. This steel plate has bright appearance, which has good performance of a variety of materials. Pre-painted galvanized steel coils not only greatly improve the chemical stability of the material, but also have more effective anti-rust and anti-corrosion properties. The extensive applications of pre-painted galvanized steel coil also depends on its good performance, high quality pre-painted galvanized steel coil is coated with high strength steel materials, and easy to shape. It is worth to mention that all the raw materials used in the production of pre-painted galvanized steel coils are environmentally friendly materials, whether it is the production or later use...

We know that steel pipe surface treatment is one of the key factors determine the service life of the pipeline corrosion, it is a precondition for whether the anti-corrosion layer and steel tube can be combined. It is verified by the research institutions that the life of the coating depends on the quality of coating types, coating quality and environmental factors such as construction. The steel tube surface treatment effects on coating life accounted for about 50%, therefore, we should be strictly accordance with the specification on the coating on the surface of steel pipe requirements, continuously explore and summary, continuously improve steel pipe surface treatment. 1. Cleaning Using solvent and emulsion to clean the steel surface, to remove oil, grease, dirt, lubricants, and similar organic matters, but it cannot remove rust, scale, such as welding flux on the surface of the steel, so only as auxiliary in the anti-corrosion production. 2. Rust cleaning by tools Mainl...