Transactions of Materials and Heat Treatment

Title：Optimization on rolling process for steel 42CrMo

Authors： Li Xiaolong Zhou Dunshi Zhou Lixin Cheng Weiguo Zou Hui

Unit： Daye Special Steel Co. Ltd. Hubei Province Key Laboratory of High Quality Special Steel

KeyWords： steel 42CrMo normal rolling process process of controlled rolling and controlled cooling finishing rolling temperature hardness

ClassificationCode：TG335.6

year,vol(issue):pagenumber：2017,42(1):71-74

Abstract：

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.

Funds：

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

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