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SS400/S20C/1018 cold drawn flat bar /Hex steel bar Square steel bar/flats bar/hexagonal steel 1. Main grade:Carbon:S20C S45C SS400 Q235B 1020 1045 CK45 S35C S235JR S355JR Alloy grade:4130 4140 4150 5140 ML40Cr SCr440 GR8.8 alloy steel round bar 1. Main standard GB JIS DIN ASTM/AISI/SAE 40Cr SCr40 41Cr4 5140 3.
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