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40cr钢板40CrV 1Cr17Ni2 50CrV 50CrVA MN13 12L14 1214 12L15 1215 20MnCr5 1Cr13 2Cr13 3Cr13 4Cr13 9Cr18 9Cr18Mo 9Cr18MoV SAE8620H 8620H 25CR2MOV 65MN 12Cr1MoV钢板/12Cr1MoVG 12Cr1MoV圆钢20CrNiMo/20CrNiMoA 40CrNiMo/40CrNiMoA 65Si2MnA 15CrMoR 16MnCr5 1