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Structural Mechanical Alloy Steel 1.7225 SCM440 SAE4140 42CrMo Perform Standard: GB/T 3077-1999 Grade:1.7225, SCM440, SAE4140, 42CrMo Chemical Composition (%) C Si Mn Cr Mo P S Ni 0.38~0.45 0.17~0.37 ...