steel pipe

    Advantages of straight seam resistance welded pipe compared with seamless steel pipe are following below:     A) Good mechanical properties. As the welded steel pipe with easy control of rolling, with the welding technology and on-line heat treatment technology, the performance of the weld can be controlled, so straight seam welded steel pipe elongation than seamless steel pipe 8% -10% higher, which Is because the straight seam electric-welded pipe carbon content of less than 12% lower than the seamless tube.     B) High dimensional accuracy. Welded steel pipe diameter and wall thickness than the seamless steel pipe deviation is much smaller, because the strip rolling and pipe forming easy to control, so high dimensional accuracy.     C) Straight seam welded steel pipe with high concentricity, uniform wall thickness. Weld after heat treatment, microstructure uniform, with a strong ability to collapse collapse.     D) As the ...

    Inspection requirements for seamless steel tube     1, Chemical composition     In order to improve the uniformity of chemical composition in steel and the purity of steel, to reduce the non-metallic inclusions in the tube and to improve the distribution state, it is often used to improve the chemical composition of the steel, such as As Sn Sb Bi Pb and gas NHO. External refining equipment for refining of molten steel, and even the use of electroslag furnace on the tube re-melting refining.     2, Dimensional accuracy and shape     The geometry of the seamless steel pipe mainly includes the outer diameter, wall thickness, ellipticity, length, curvature, pipe end face inclination, groove angle and the blunt edge, cross-sectional size of the steel pipe.     3, Surface quality     The standard specifies the requirements for the "smooth surface" of seamless steel tubes. Common defects include: cracks, hai...

    Resistance welding (ERW) is a low-cost, high-efficiency pipeline manufacturing technology, which produces a variety of steel pipe called ERW pipe. ERW welded pipe is made of steel plate or strip after crimping and then welded by high frequency resistance welding. The welded pipe with longitudinal weld has been widely used in oil and natural gas transmission pipeline, oil well casing, coiled tubing and soil (Such as a scaffold).     In recent years, the ERW technology has also been used to produce economical petroleum-grade pipes, partly because of the low cost of ERW technology; on the other hand, the petroleum-made pipes are made of inexpensive carbon steel to reduce pipeline costs. Since the ERW process is a localized heating and pressurizing process, the heat dissipates rapidly along the metal pipe and the crimped steel plate after welding under pressure. The cooling rate can reach the critical cooling rate of the steel. In the ERW pipe, Welding area of its...

    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 ...

    Finishing tube is also called cold rolled precision tube, it is one of the types of seamless steel tube production process. The characteristics of the fine rolling tube:     1. The comprehensive performance of cold rolled precision tube is good, can bear high pressure, cold bending, flaring, flattening not crack, not wrinkled skin, can do all kinds of complex deformation and mechanical processing.     2. The cold rolled precision tube tolerance dimension precision is high, the product accuracy control in the plus or minus 5 mm, inside and outside wall finish good, surface oxide layer.     3. The popularization and application of precision seamless steel pipe steel can save and improve processing efficiency and reduce machining process and equipment investment, can save cost and save machining time, greatly improve the production capacity and material utilization, at the same time to improve product quality, reduce the cost.   ...

    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.     AP...

    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 b...

    An important principle is that all steel pipes, whatever their size, are inevitably limited in their coverage. So except seamless steel pipe, welded steel pipe, galvanized steel pipe, we cannot ignore the necessity of pipe fittings.     we can manufacture multifarious pipe fittings from elbows, tees, reducers, flanges, cap to mechanical processing machines of elbows push-type forming. Taking steel elbow for instance, we can see the product details here:     Steel Elbow:     Material: Carbon Steel, Stainless Steel.     Size: 1/2"-124"     WT: sch10-sch160     Standard: ANSI, ASME API5L, OCT, DIN and JIS, etc.     Packaging Detail: Wooden case or wooden pallets or as customer's request.     http://www.xysteelpipe.com/info/ASTM-A795-Pipe-997-1.htm

    The API 5CT standard covers seamless and welded casing and tubing pipes for oil and gas transportation. Casing pipes are available in the following materials: H-40, J-55, K-55, N-80, L-80, C-90,T-95 ,P-110, Q-125.     Depending on the different condition and depth of the well, we use the different steel grades. The casing is required anti-corrosion under the corrosive environment. In the case of complex geological conditions, the casing has to be resistant to collapse. Most casing steel grades have the same chemical composition. What makes grade different is the heat treatment applied. Casing grades mainly differ in their yield strength, tensile strength, and hardness.     According to API 5CT, there are four groups of products to API SPEC 5CT is applicable include the following grades of pipe:     Group 1: Grades H, J, K,M, N and R;     Group 2: Grades C, L and T;     Group 3: Grade P;     Group 4: Gr...

    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 speed...

    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 dif...

    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 ...

    In order to give customers secure steel products, such as seamless steel pipe, ERW steel pipe and so on, Tianjin Xinyue Steel Group would do various tests before the finally step of selling.     Our steel pipes’ tests covers from Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test to X-ray Test. Today, we would like to have a details introduction to Hydrostatic Pressure Testing.     Hydrostatic Pressure Testing:     Hydrostatic test is a test which coming after the pressure vessel is manufactured. Manufacturers would add appropriate amount of water to the vessel in order to test the macroscopic strength of the vessel (if it is deformed too much) and the sealing point and welding before the newly installed vessel 3 is used or entered.     http://www.xys...

    a. Oiling and marking: The steel pipe qualified by the hydrostatic testing machine is oiled to prevent corrosion, and marking is performed according to the user's requirements.     b. Straightening milling: The original curled steel plate is flattened by an anvil press, and then the two edges of the steel plate are double-faced by a milling machine to achieve the required plate width, plate edge parallelism, and groove shape.     c. Shear forming: In the production line, the steel plate is spirally curled into a tube along the outer edge.     d. Butt welding: The seamless steel tube equipment market adopts advanced double-sided submerged arc welding technology for pre-welding, internal welding and external welding. The welded steel pipe was cut to a gauge length using a plasma ruler.     e. Visual inspection: Professional technicians check some basic parameters.     f. Ultrasonic flaw detection: The development of...

    The method for quality inspection of LSAW pipe, in which the physical method is the most commonly used inspection method, physical examination is a physical phenomenon to determine or check the application of the method.     Magnetic force     Magnetic flaw detection can only find the shortcomings of the appearance and appearance of the magnetic straight seam welded pipe. The disadvantages can only be quantitatively analyzed. The nature and depth of the flaw can only be estimated based on experience. Magnetic flaw detection is the use of magnetic field to discover the leakage of magnetic longitudinal weld seams. According to the method of measuring magnetic flux leakage, it can be divided into magnetic powder method, magnetic induction method and magnetic recording method, in which the magnetic powder method is the most widely used.     Soak inspection     Penetration testing is the use of some liquid physical properties suc...