SSAW Pipe

　　Production process of oil casing pipe 　　 Cold drawing: 　　Tube billet - inspection - shearing - heating - hot perforation - heading - capillary tube storage - pickling, phosphating, saponification - cold drawing - heat treatment - physical and chemical experiments - straightening - cutting head and tail - surface and size inspection - eddy current testing - ultrasonic testing -Turning wire and tube end processing 　 　Hot rolled: 　　Tube billet- inspection - cutting - ring furnace heating - perforation - tube rolling - micro tension reduction - straightening - cutting head and tail - inspection - non-destructive testing - hydraulic test - Turning wire and tube end processing 　　Quality Inspection: 　　Conventional non-destructive testing + hydrostatic test (magnetic particle testing MPI, eddy current testing ET, ultrasonic testing UT, radiographic testing RT.) 　　 http://www.xysteelpipe.com/info/Production-Process-of-Oil-Casing-Pipe-1562-1.htm

　　 Scaffolding products , one of the most widely used engineering equipment in construction. No matter scaffolding plank, or other relative products, they are mainly made by main frame, diagonal rod, connecting pin, foot plate and other components. Nowadays, we figure out that it has more and more importance for our various building projects. 　　Compared with ancient helpers for engineering project, we will find out that scaffolding products would have its special places. 　　First of all, lightweight is its obvious advantage which makes it is convenient for workers to carry and build. 　　Second, if we use scaffolding products like door structure, this is very easy for workers to pass or climb. Under this situation, it would save time for workers. 　　Third, with its special construction, it will provide customer fast construction speed once used among various engineering projects. 　　Forth, high cost performance would make it best sell among the market. With small space, and long u...

　　 Weld pipe weld porosity affects not only the pipeline denseness, resulting pipeline leakage and corrosion will be induced point seriously reduce the weld strength and toughness. Factors weld porosity are: the flux in the water, dirt, oxide and iron filings, welding ingredients and cover thickness, surface quality steel and steel side plates processing, welding technology and steel molding processes. 　　 Related prevention measures: 　　1. Flux ingredients. CaF2 and SiO2 containing an appropriate amount of welding, the reaction will absorb large amounts of H2, generating a high stability of the HF insoluble in the liquid metal, thereby preventing the formation of hydrogen gas holes. 　　2. The bulk thickness of the flux is generally 25-45mm, large solder particle size, bulk density hour take the maximum thickness, whereas the minimum value; high current, low welding speed accumulation take the maximum thickness, whereas the minimum value addition, summer or air humidity, flux recov...

　　Fillet weld joints are a type of weld joint. The fatigue damage has local characteristics. Based on the basic idea of the stress field strength method, through the analysis of the field diameter of the diagonal welded joint, the elastoplastic finite element calculation of the stress concentration area of the flange fillet joint and the numerical solution of the stress field strength The local stress field strength at the weld toe region of the joint was obtained. 　　1. There are only two types of welds: 1. Butt welds; 2. Fillet welds 　　2. There are five kinds of joints: one, butt joint, two, T-type joint (cross joint), three, corner joint, four, lock bottom joint, five, lap joint; 　　Fillet joints are not necessarily fillet welds. If the fillet joint is opened, the full penetration is called the butt weld of the fillet joint; if the fillet is not opened, the fillet joint is not called the fillet weld. 　　 Check www.tjxysteel.com for more info

　　In the processing of seamless steel pipes, there is often a problem that cannot be ignored, which is the weld seam. In order to ensure the performance of seamless steel pipes, we need to take some measures to control the distance between their welds. Otherwise, if the gap is not reasonable, it will affect its use performance. Next, let's learn the main content together. 　　In general, in order to ensure the performance of seamless steel pipes as much as possible, we will control its weld gap to an appropriate range, this range is 1 ~ 3mm, and at the same time ensure that the ends of the weld are flush. And if the gap is not well controlled, what negative effects will it bring? If it is too large, it will easily cause the proximity effect to be reduced, which will eventually lead to poor connection and cracking. 　　If the remaining gap is too small, it is easy to affect the surface quality of the seamless steel pipe under the action of extrusion. So we need to take some measures...

　　Based on the analysis of fracture morphology, chemical composition, mechanical properties, microstructure and corrosion product composition, the causes of cracking of casing collar of an oil well were analyzed. 　　The results show that the coupling cracking is mainly caused by the stress corrosion cracking caused by hydrogen sulfide; the casing is exposed to the hydrogen sulfide corrosion medium after entering the well, which causes serious pitting corrosion on the outer surface of the coupling, forming corrosion pits, and the pulling of the coupling. The stress is large, and the interaction between the tensile stress and the corrosive medium eventually leads to stress corrosion cracking of the coupling. To prevent the accident from happening again, it is recommended to use the sulfur-resistant coupling material and connect the special thread to the casing.

　　Operation method: The quenched seamless steel pipe is cooled to -60 to -80 degrees or lower in a low temperature medium (such as dry ice, liquid nitrogen), and the temperature is uniform and then the temperature is taken to room temperature. 　　 Objective: 　　1. Convert all or most of the retained austenite in the quenched seamless steel pipe to martensite, thereby improving the hardness, strength, wear resistance and fatigue limit of the seamless steel pipe; 　　2. Stabilize the structure of the steel to stabilize the shape and size of the seamless steel pipe. 　　 Application points: 　　1. After quenching, the seamless steel tube should be cold-treated immediately, and then tempered at low temperature to eliminate the internal stress during low-temperature cooling. 　　2. Cold treatment is mainly applied to compact tools, gauges and compact parts made of alloy steel. 　　 http://www.xysteelpipe.com/info/Objective-and-method-of-cold-treatment-of-seamless-steel-tube-1552-1.htm

　　Cold expansion of straight seam steel pipe has the following purposes: 　　(1) Improve LSAW steel pipe and pipe end the geometric dimensional accuracy, so that the diameter of the steel tube and pipe end, roundness, and the diameter of the pipe ends Poor meet the standard requirements, facilitate field welding construction. 　　(2) Reduce inhomogeneous deformation of LSAW steel pipe forming and welding process, to reduce the residual stress of forming and welding of tube, and improve its distribution, improve the overall mechanical properties of the steel pipe. 　　(3) Steel Pipe overall performance of a comprehensive and effective inspection. 　　(4) Cold expansion also improve LSAW the tube straightness role, especially for the smaller diameter LSAW pipe straight is more obvious. 　　Straight seam submerged arc welded pipe cold flaring, steel tube and pipe end diameter will increase by about one percent difference in diameter of the diameter, roundness, and the pipe ends are great...

　　What are the advantages of square tube hardness testing: the workpiece with a metal material manufacturing quality inspection before and after heat treatment, is usually achieved by hardness testing, hardness refers to the metal resist other more hard object pressed into its surface capacity, and therefore hardness is a very important mechanical properties. He somehow reflect the mechanical properties of the workpiece, and other performance tests (such as tensile, impact, torsion test, etc.), compared with a simple, practical and convenient features, specific induction has the following advantages: 　　1) The hardness of the workpiece and other mechanical properties (hardness, ductility, toughness, etc.) there is a certain relationship. The higher the hardness of the material, the greater the strength, ductility and toughness smaller. The hardness and strength of metal there is a certain relationship, when the hardness of greater than carbon structural steel 175HB; 　　2) Hardness t...

　　(1) Chemical properties 　　Refers to the chemical or electrochemical reaction of the shaped tube metal material against the surrounding medium, including: 　　1. Corrosion resistance: refers to the ability of metal materials to resist various media erosion; 　　2. Antioxidant: refers to the ability of the shaped tube material to resist the generation of scale at high temperatures. 　　(2) process performance 　　Refers to those properties of materials that withstand a variety of processing and processing capabilities, including: 　　1. Casting performance: Refers to whether the metal or alloy is suitable for casting. It mainly includes flow properties, full moldability; shrinkage, ability to shrink volume when the casting solidifies; segregation refers to chemical composition unevenness. 　　2. Welding performance: refers to the welding of two or more kinds of metal materials by heating or heating and pressure welding methods, and the interface can meet the purpose of use. 　　3. To...