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16MnCr520crmnti 6542高速钢 M220crmnti 20CRMNTI 9SICR 38CRMOA
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16MnCr520crmnti 6542高速钢 M220crmnti 20CRMNTI 9SICR 38CRMOA
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8620H 20CrMnTi 板材65mn 40CrNiMo圆棒60Si2Mn扁条16MnCr520crmn
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