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SCM440 Alloy Steel Forged Gear Blanks 42CrMo4 1.7225 AISI4140 Quenching And Tempering Rough Machining Material:42CrMo4 Standards: GB42CrMo ASTM4140/4142 AISI4140/4142 JIS SCM4 DIN 41CrMo4 NF40CD/42CD4 ...