Seamless or welded steel pipe, the standard is API 5L (petroleum pipeline pipe). PSL2 is the level of one, the other level is PSL1. comparatively speaking, the requirements of PSL2 are higher than those of PSL1.
API 5L is the specification for pipeline steel pipe formulated by the American Petroleum Institute, and B is a kind of steel grade for pipeline pipe. the main steel grades in API 5L are A, B. X42, X46, X52, X56, X60, X65, X70, X80, X90, X100, X100, and so on, X42, X46, X52, X56, X60, X65, X70, X80, X90, X100, X120 and so on. Different steel grades of steel pipe with different manufacturing processes, different chemical compositions, different physical properties, different inspection methods and so on.
Expanded Information
Seamless steel pipe has a wide range of uses, seamless steel pipe for general purposes is rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the highest output, mainly used as pipelines for the transportation of fluids or structural parts.
Supplied in three categories according to different uses:
a, supplied according to chemical composition and mechanical properties;
b, supplied according to mechanical properties;
c, supplied according to hydraulic test. Steel pipe supplied according to category a and b, such as for bearing liquid pressure, also need to carry out hydraulic test.
Seamless tubes for specialized purposes include seamless tubes for boilers, seamless tubes for chemical and electric power, seamless tubes for geological purposes and seamless tubes for petroleum purposes, among many others.
Seamless steel pipe has a hollow cross-section and is used in large quantities as a pipeline for the transportation of fluids, such as pipelines for the transportation of oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when the bending and torsion strength is the same, and it is a kind of economic cross-section steel.
Widely used in the manufacture of structural and mechanical parts, such as automobile driveshafts, bicycle frames and steel scaffolding used in building construction, etc. Use steel pipe to manufacture annular parts, can improve material utilization, simplify the manufacturing process, save materials and processing time, has been widely used in the manufacture of steel pipe.
Baidu Encyclopedia - API5L Seamless Steel Pipe