4Cr13H模具钢SKD61 CR12MoV精板dc53 s136 nak80 h13圆棒p20 440C

金属材料及制品^钢板^^^江苏 徐州^4Cr13H模具钢SKD61 CR12MoV精板dc53 s136 nak80 h(咨询特价)棒p20 440C