Steel Pipe Steel Pipe :ASTM A53, BS1387,GB/T3091 ,JIS3452 Grade ... pipe:20mm-325mm 2.W.T.of erw steel pipe:0.8mm-12.75mm3. ASTM A53,ASTM A500,ASTM A252 ... , EN10219 BS1387 ERW Steel Pipe O.DO ... according to customers'requirementsInternationalStandardISO 9001 2008StandardASTM A53,ASTM A500,ASTM A252,EN10219 BS1387Steel GradeS275JR S355,SS400,Q235, ...