Products: api 5l grade b erw tube/pipe Size: 1/4"-24" Thickness: 2mm-60mm Certificate: ISO, API material:carbon api 5l grade b erw tube/pipeSpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, 20, 35, 45, 40Mn2, 45Mn2, 27SiMn, 20Cr, 40Cr, 20CrMo, 35CrMo, 38CrMoA1, 50CrV, 30CrMnSiASTM A500-98and pipesASTM A501-98for structural purposeASTN A519-98 JIS G3441-1994 JIS ...