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Polishing 42CrMo4 ASTM 4140 JIS SCM440 BS 708M40 NF 42CD4 High Speed Tool Steels Round Bars Descrition: Special alloy steel, engineering steel supplied in quenched and tempered conditions. Very good machinability. High toughness, creep strength, repeated impact resistance. 1) Round bar: Dia 16mm-800mm , Length can be customized. 2) Flat bar: Thickness: 16-500mm Width: 200-1300mm , Length can be customized. 3) Shaping: Hot forged / Hot rolled 4) Surface condition: Black