... Carbon steel and alloy steel Rounds and Squares and Flats. Good price and high quality Hot Forged steel round barSteel grade:Carbon steel:Chinese ... Standard:20#,25#,35#,45#,50#,60#;Japan Standard:S20C,S25C, ... Europe Standard:CK15,C.22,C45,CK45,C60,CK60;C45E;Alloy Steel:Chinese Standad:16Mn,20Mn,30Mn2,30Mn5,40Cr,Q345D,Q345E,Q390 ...