Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe 1. API 5L ... M-PI-190(2), 3. NACE MR-0175. Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe 323Design and manufacture many ... seamless carbon steel pipe and tube, JCOE technology Large Diameter, Thick Wall Steel Pipes and Tubes, ERW/LSAW welded carbon steel ... 1-1997, GB/T13793-92,GB/T6728-2002. Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe