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Chemical Composition of M42 Tool Steel Material ASTM A681 C Si Mn P S Cr Mo V w Co M42/ T11342 1.05~1.15 0.15~0.65 0.15~0.40 0.030 Max 0.030 Max 3.50~4.25 9.00~10.00 0.95~1.35 1.15~1.85 7.75~8.75 DIN ...