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Hot Rolled Steel Flat Bar SCM440 4140 1.7225 42CrMo For Mechanical Gear Bolt Use 1. Chemical Composition (%) C Si Mn Cr Mo P S Ni 0.38~0.45 0.17~0.37 0.50-0.80 0.90~1.20 0.15-0.25 ≤0.03 ≤0.03 ≤0.25 2. ...