Cr17型马氏体不锈钢大截面锻材淬火工艺的研究

Study on Quenching Process of Large Section Forging of Cr17 Martensitic Stainless Steel

通过实验室热处理试验,摸索出Cr17型马氏体不锈钢的淬火温度及回火温度。在?500mm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。淬火时采用水-空交替冷却,总淬火时间最短,生产效率最高。同时水做为淬火介质,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。

The quenching and tempering temperature of Cr17 martensitic stainless steel werestudied under the heat treatment test in laboratory. When ？500mm forged round steel was treatedby hardening and tempering, hardness, microstructure and horizontal mechanical properties inroom temperature were compared by three different quenching processes. The results showed thatthe best quenching process was to cool steel with water and air alternate, HRC of steel after one-time tempering was less than or equal to 2.5, microstructure in center was uniform temperedsorbite along with a little residual austenite, and horizontal tensile properties in room temperaturewas the highest. Once the water-air cooling method was adopted, the quenching time was theshortest but its production efficiency was the highest. Meanwhile, water, a preferred quenchingmedium, had the advantages of low price, no-pollution and stable properties.