... steel pipe spiral steel pipe alloy pipe Typecarbon steel pipe welded pipe galvanized pipe, seamless steel pipe spiral steel pipe alloy pipe StandardASTM A106 GRB/API5LGRB/ASTMA53GRB DIN ANSI GB SH HG APIMaterialGRB20#STEEL,A3,A234,ASTM ... ,Q235,Q345,10#,45#,12CrMo, ,ST37 ,16Mn,Cr5Mo,15CrMoOD1/4''-24'',13mm-610mmWTSCH20,SCH40,SCH60,SCH80 ...