Generally speaking, API 5L refers to API 5L line pipe,which is out of the ground the oil, gas, water, transported by pipeline to pipe oil and gas industry companies.

according to the manufacture process and the tube bloom used different shapes, api 5l can be divided into api 5l seamless steel pipe and api welded steel pipe, among the usage quantity of welded steel pipe is more than seamless steel pipe.

Line pipe grade and chemical components

API 5L can be divided into API 5L PSL 1 and API 5L PSL 2, including API 5L PSL 1 level and the categories are: A, B, x42, x46, x52, x56, x60, x65, x70, API 5L PSL 2 level and the category is B, x42, x46, x52, x56, x60, x65, xx70, x80. the higher the level the stronger mechanical properties.

Application: used for oil and gas industry, gas, water, oil transportation.

API 5L PSL 1 Chemical composition and mechanical properties

Steel grade  C(max)  Mn(max)  P(max)  S(max)  Tensile strength  Yield strength

B  0.28  1.20    0.030  0.030  414  241

X42  0.28  1.30  0.030  0.030  414  290

X46  0.28  1.40  0.030  0.030  434  317

X52  0.28  1.40  0.030  0.030  455  359

X56  0.28  1.40  0.030  0.030  490  386

X60  0.28  1.40  0.030  0.030  517  414

X65  0.28  1.40  0.030  0.030  531  448

X70  0.28  1.40  0.030  0.030  565  483

API 5L PSL 2 Chemical composition and mechanical properties

Steel grade  C(max)  Mn(max)  P(max)  S(max)  Tensile strength  Yield strength

B  0.24  1.20  0.025  0.015  414-758  241-758

X42  0.24  1.30  0.025  0.015  414-758  290-758

X46  0.24  1.40  0.025  0.015  434-758  317-758

X52  0.24  1.40  0.025  0.015  455-758  359-758

X56  0.24  1.40  0.025  0.015  490-758  386-758

X60  0.24  1.40  0.025  0.015  517-758  414-758

X65  0.24  1.40  0.025  0.015  531-758  448-758

X70  0.24  1.40  0.025  0.015  565-758  483-758

API SPEC 5L Line Pipe

API SPEC 5L line pipe production process is divided into seamless steel pipe, ERW steel pipe, submerged arc welded pipe. But the main use of seamless steel pipe (the Seamless), straight seam high frequency resistance welding steel pipe (Electric-Resistance Arc Welding, abbreviated as ERW), LSAW (Longigudinally Submerged Arc Welding short LSAW), spiral submerged arc welded pipe (Spirally Submerged Arc Welding, short of SSAW) four.

LSAW pipe divided into UO (forming method of UOE), RB (RBE), the JCO (JCOE) and other kinds. Steel plate in the molding would be pressed into a U-shaped, and then pressed into the O-, and then the inside and outside submerged arc welding, after welding, usually at the end of the full length of the expander (Expanding) called UOE welded pipe, not expanding known as the UO pipe. Pressure steel plate roll bending (Roll Bending), and then the inside and outside submerged arc welding, after welding, expanding the RBE pipe, or not expanding the RB pipe. Molding plate according to the type J-O-C-order expanding JCOE pipe or not expanding JCO pipe after welding. LSAW pipes above, the use of common of UOE. The high frequency resistance welding tube ERW tube embryo through the skin effect and proximity effect in high-frequency current to the edge of the melt, and then squeeze rollers under pressure welding, which is characterized by no external filler metal, heat affected zone, high production efficiency. Spiral seam pipe the SSAW for long-distance line pipe has a long history, the pipeline in China is mainly used.