DN500mm 508mm 20 inch S355jrh 36 Inch LSAW Steel Pipe ISO 3183

Straight Seam Submerged Arc Welding Pipe Production LSAW Steel Pipe

in API 5 l, the terms of the contract in addition to indicate the specifications and grade of steel usually indicators, must also indicate the level of product specification, namely PSL1 or PSL2. PSL2 in chemical composition, tensile properties, impact energy, and nondestructive testing which strict in PSL1 indicators. PSL1 does not require impact performance, PSL2 all except x80 grade steel, full size 0 ℃ average Akv: longitudinal p j, 41 lateral acuity 27 j.Average grade X80 steel, full size 0 ℃ Akv: longitudinal 101 j, or lateral acuity 68 j.3, line pipe should do water pressure test, and the standards are not allowed to nondestructive generation of hydraulic pressure, which is also the API standard and one big difference between our country standard.

Straight seam submerged arc welding pipe production cost is high than high-frequency steel pipe, spiral steel pipe, but compared with seamless pipe price space is very large.High frequency straight seam submerged arc welding pipe can produce the material of steel pipe and spiral steel pipe can't production, such as high-frequency steel pipe is usually in domestic commonly used specifications, and batch production inventory, usually made of Q235B, Q345B, high frequency equipment and other hard steel material spiral equipment domestic can't production.

Straight seam submerged arc welding pipe in domestic heavy steel structure engineering and fluid pipeline engineering, wide application in the foundation pile engineering.Petroleum pipeline, natural gas, city pipe network, mine water slurry pipeline, high voltage transmission line, wind power, bridge1, PSL is short for product specification level.Line pipe product specification level is divided into PSL1 and PSL2, also can say quality grades are divided into PSL1 and PSL2. PSL2 above PSL1, these two levels is not only different inspection requirements, and chemical composition, mechanical performance requirements are different, so the order