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AISI 4140/4130/1018/1020/1045 S45c Sm45c Sae 1035 Hard Chrome Carbon Steel Round Bar Material GB: Q195, Q215, Q235A, Q235B, Q235C, Q235D, Q255A, 255B, Q275, Q295A, Q295B, Q345B, Q345C, Q345D, Q345E, ...