A.60Si2MnA B.ZGMn13 C.Cr12MoV D.3Cr13
A.冷變形模具鋼 B.低合金刃具鋼 C.特殊性能鋼 D.高速鋼
A.合金調(diào)質(zhì)鋼 B.不銹鋼 C.碳素工具鋼 D.高錳耐磨鋼