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<p>我们厂做Cr12MoV冲压模，碳化物偏析导致崩刃吃了不少亏。后来总结出三条经验：1）原材料采购指定电渣重熔料（含碳化物级别保证3级以内），贵10%但模具寿命翻倍；2）锻造必须三镦三拔，锻造比4以上；3）热处理前做超细化处理——1050C加热油淬+750C回火，之后再按正常工艺淬回火。三步下来碳化物均匀度明显改善，冲切模寿命从3万冲次提升到8万冲次。</p>