1/4''-24'',13mm-610mm,carbon steel pipe welded pipe galvanized pipe, seamless steel pipe spiral ... /ASTMA53GRB DIN ANSI GB SH HG APIMaterialGRB20#STEEL,A3,A234,ASTM,Q235,Q345,10#,45#,12CrMo, ,ST37 ,16Mn,Cr5Mo,15CrMoOD1/4 ... is long, high security, highly pressurized, widely usedMin order3 tons ASTM carbon steel pipe