Development of low alloy NM400 wear-resistant steel strip based on 2 250 mm hot continuous rolling mill
SU Cheng1,2, FENG Guang-hong1, YUAN Xiao-ming2, WANG Shao-bing2, LI Zhao2
1. Metallurgical Technology Institute, Central Iron and Steel Research Institute, Beijing 100081, China; 2. Technology Center, Baotou Iron and Steel (Group) Co., Ltd., Baotou 014010, Nei Mongol, China
Abstract:In order to develop low-alloy high-strength thin-gauge wear-resistant coils with cost advantages,the current domestic advanced 2 250 mm hot continuous rolling mill process characteristics are adopted,after two-stage controlled rolling,three types of front concentration,front dispersion and segment cooling are used respectively controlled cooling process,systematically studied the effect of different cooling rates and cooling paths on the microstructure and mechanical properties of the product at the same start cooling temperature. The results show that the use of segmented cooling in the three cooling modes is more reasonable,and the specific key control process the intermediate temperature is 650 ℃,the waiting time is 10 s,the two-stage cooling rate is 40 ℃/s,and the coiling temperature is 170 ℃. The microstructure of products at room temperature is comprise mainly bainite and little of lath martensite and ferrite,which has the advantages of high strength and toughness and low yield ratio,the various performance meet the requirements of GB/T 24186—2009 and user conditions.
宿成, 冯光宏, 袁晓鸣, 王少炳, 李钊. 基于2 250 mm热连轧产线开发低合金NM400耐磨钢卷板[J]. 钢铁, 2021, 56(2): 126-131.
SU Cheng, FENG Guang-hong, YUAN Xiao-ming, WANG Shao-bing, LI Zhao. Development of low alloy NM400 wear-resistant steel strip based on 2 250 mm hot continuous rolling mill[J]. Iron and Steel, 2021, 56(2): 126-131.
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