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高合金模具钢与普通的钢材不同,具有如下特点:①变形抗力大;②导热性低;③塑性低;④锻造温度范围窄;⑤组织缺陷严重;⑥淬透性高;⑦变形发热效应较大。高合金模具钢锻裂报废率高,碳化物级别不易达到要求。锻造的目的主要是将粗大的共晶碳化物击碎,使其均匀,以便加工和提高模具寿命。 1.高合金模具钢的种类及备料检查常用的高合金模具钢有高速钢(W18Cr
High alloy die steel and ordinary steel are different, has the following characteristics: ① large deformation resistance; ② low thermal conductivity; ③ low plasticity; ④ forging temperature range narrow; ⑤ serious tissue defects; ⑥ high hardenability; ⑦ deformation heating effect than Big. High alloy die steel forging scrap rejection rate, carbide grade is not easy to meet the requirements. The main purpose of forging is to crush the coarse eutectic carbides to make them uniform so as to process and improve the life of the die. 1. High alloy die steel types and preparation of materials commonly used high-alloy die steel high-speed steel (W18Cr