低合金工具钢CrWMn(0.90～1.05%C、0.9～1.2%Cr、0.8～1.10%Mn、1.20 ～1.60%W),具有高的淬透性和耐磨性,淬火变形小,广泛用于制造模具,但是这种钢冶炼时液析倾向大,轧制后带状偏析较重,加热时易形成网状碳化物等缺陷,模具在淬火、磨削加工或生产应用时,常产生裂纹或脆断如图1。带状偏析只能通过锻造加工予以改善。对于网状碳化物的改善与消除可通过正火处理。但CrWMn钢通常的正火工艺采用970 Low alloy tool steel CrWMn (0.90 ~ 1.05% C, 0.9 ~ 1.2% Cr, 0.8 ~ 1.10% Mn, 1.20 ~ 1.60% W), high hardenability and wear resistance, quenching deformation is small, widely used in the manufacture Mold, but this steel smelting tend to be large when liquid-liquid separation, heavy strip segregation after rolling, easy to form mesh carbides and other defects when heated, the mold quenching, grinding or production applications often crack or brittle Broken as shown in Figure 1. Band segregation can only be improved by forging. Mesh carbide for the improvement and elimination can be normalized. However, the normal normalizing process of CrWMn steel uses 970