，模具材料及热处理技术，
模具材料及热处理技术
Cr17型马氏体不锈钢大截面锻材淬火工艺的研究
刘宝石，汝亚彬，刘明，秋立鹏，王琳
抚顺特殊钢股份有限公司技术中心（辽宁抚顺113006）
【摘要】通过实验室热处理试验，摸索出Cr17型马氏体不锈钢的漳火温度及回火温度。在 Φ500mm锻制大圆材实际调质时，通过3种不同淬火工艺得到了硬度、组织及室温横向机械性能对比结果。最终确定采用水-空气交替冷却为最佳淬火冷却工艺，钢材一次回火后整体硬度偏差≤2.5HRC，心部组织为均匀的回火索氏体组织+少量的残余奥氏体，钢材心部的室温横向拉伸性能最高。泽火时采用水-空交替冷却，总泽火时间最短，生产效率最高。同时水做为泽火介质，具有价格低、无污染和性能稳定等优点，为调质厂首选的淬火冷却介质。
关键词：马氏体不锈钢；泽火；水-空交替冷却；回火索氏体
中图分类号：TG162
文献标识码：B
Study on Quenching Process of Large Section Forgingof Crl7Martensitic Stainless Steel
[Abstract] The quenching and tempering temperature of Cr17 martensitic stainless steel were studied under the heat treatment test in laboratory. When 50Omm forged round steel was treated by hardening and tempering, hardness, microstructure and horizontal mechanical properties in room temperature were compared by three different quenching processes, The results showed that the best quenching process was to cool steel with water and air altermate, HRC of steel after onetime tempering was less than or equal to 2.5, microstructure in center was uniform tempered sorbite along with a little residual austenite, and horizontal tensile properties in room temperature was the highest. Once the waterair cooling method was adopted, the quenching time was the shortest but its production efficiency was the highest. Meanwhile, water, a preferred quenching medium, had the advantages of low price, nopollution and stable properties.
Key words : martensitic stainless steel; quenching; waterair alternate cooling; tempering sorbite
1引言
近年来，期料模具行业发展迅速，尤其是在生产聚氯乙烯、氟塑料、阻燃性ABS等为原料的塑料制品时，塑料在熔融状态下会分解出氯化氢、氟化氢和二氧化硫等气体，对模具型腔有腐蚀作用，因此要求成型模具不但具有高的强韧性，应具有一定的耐蚀性能"。 Cr17型马氏体不锈钢具有优良的强韧性和较高的耐蚀性而获得广泛的应用，由于Cr17型马氏体不锈钢合金含量高、成品材截面尺寸大，应选择适合的淬火工
《模具制造》2018年第5期万方数据
艺，使成品材调质后得到最佳的组织及机械性能。本文主要对Cr17型马氏体不锈钢大截面材率火工艺进行研究。
2试验材料与方法
试验材料
2.1
试验用Cr17型马氏体不锈钢生产工艺流程为：电炉+LF+VD+电渣重熔+35MN快锻机成材→+调质处理，成品材截面尺寸为Φ500mm，其化学成分如表1所示。
·85.