... ,STD,XS,XXS Standard: ASTM,DIN,BS Material:ASTM A234 WPB ASTM A106 seamless pipe with good quality :high quality,low ... BS,DIN,ASME,API,GB,ectProcess: Cold Draen,Cold Rolled,EFW,ERW,Hot Rolled,SAW.and so on.Structure type: seamless pipe,straight steel pipe ... ,square pipe,spiral pipe ...