锻压技术

42CrMo钢轧制工艺优化

英文标题：Optimization on rolling process for steel 42CrMo

作者：李小龙周敦世周立新程卫国邹晖

分类号：TG335.6

出版年,卷(期):页码：2017,42(1):71-74

摘要：

针对某轧钢厂生产的Φ100 mm以下规格42CrMo钢热轧态硬度超标现象，研究了常规轧制工艺和控轧控冷工艺，分析了不同工艺参数对42CrMo钢金相组织与硬度的影响。通过优化工艺参数，将终轧温度控制在830~850 ℃，轧后保温罩冷却速率控制在0.1~0.2 ℃·s-1，出保温罩温度控制在400~500 ℃。结果表明：采用常规轧制工艺，42CrMo钢的硬度值普遍在290～330 HBW之间，金相组织主要为贝氏体；采用控轧控冷工艺，42CrMo钢的硬度值可控制在220~260 HBW之间，金相组织为铁素体与珠光体；通过优化在线轧制工艺参数，42CrMo钢热轧态硬度满足了标准要求，降低了生产成本，提高了钢材的市场竞争力。

For the hardness of steel 42CrMo with less than Φ100 mm produced by a rolling mill under hot rolling state exceeding the standard phenomenon, the normal rolling process and controlled rolling and controlled cooling process were researched, and the influences of different process parameters on the microstructure and hardness of steel 42CrMo were analyzed. According to the optimized process parameters, the finishing rolling temperature was controlled within 830-850 ℃, the cooling rate of insulated hood after rolling was controlled within 0.1-0.2 ℃·s-1 , and the exit insulated hood temperature was controlled within 400-500 ℃. The results indicate that based on process parameters of the normal rolling process, the hardness of steel 42CrMo universally is 290-330 HBW, and the metallographic microstructure is mainly Bainite. Therefore, according to process parameters of the controlled rolling and controlled cooling process, the hardness of steel 42CrMo is 220-260 HBW, and the metallographic microstructure is Ferrite and Pearlite. Thus, the hardness of steel 42CrMo meets the standard requirements by optimized process parameters, the production cost is reduced, and the market competitiveness is improved.

基金项目：

李小龙(1983-)，男，硕士，工程师 E-mail：lixiaolong0520@163.com

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