HPM75无磁模具钢价格，HPM75无磁模具钢，HPM75无磁模具钢密度，HPM75无磁模具钢锻件，HPM75无磁模具钢圆钢 HPM75模具钢HPM75模具钢HPM75模具钢HPM75模具钢HPM75模具钢 日本日立HPM75无磁模具钢 化学成分:C:0.65～0.75Si:≤0.80Mn:14.5～16.0Cr:2.0～2.5Mo:0.5～0.8W:0.5～0.8V:1.5～2.0Al:2
