ASTM Alloy steel tube 1),standard :ASTM A53 BS1387 BG/T3091 2)Thickness: 1mm to 60mm 3)Outer Diameter:6mm to 1080mm The Description of ASTMAlloy Steel Pipe SpecificationsChina 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 ...