SCM440. 4140. 42 Cr Mo 4. 1.7225. 42 CD 4. Manganese Steel 錳鋼 ... (具體用途) ... SCM440 4140 0.38~0.43 0.15~0.35 0.60~0.85 0.030 Max. 0.030 Max. 0.30 Max.
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