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供应P20H模具钢板材料4Cr13HS136H预硬圆钢718HNAK80精光板
现货P20718H模具钢Cr12Cr12MoV板料4Cr13HS136H圆棒SKD11DC53
模具钢NAK80SKD61S136HS136H13CR12CR12MOV4Cr13圆钢精板e
模具钢NAK80SKD61S136HS136H13CR12CR12MOV4Cr13圆钢精板