... TP430,TP901L,TP904L,S31803,S32750,S32760Executive StandardASTM/ASME A312/SA312,ASTM/ASME A269/SA269,ASTM/ASME A249/SA249,DIN 17458-85,DIN 17456 ... Electric Test,Intergranular Corrosion Test,Flaring Test,Flattening Test,Flange Test,Grain Size Test,and so onCertificateISO9001:2008,PED ... General – springs, fasteners (bolts, nuts and washers), wire.5.Manufacturing process :1) seamless pipe 2)Welded pipe :6. ...