基于2250mm热连轧产线开发低合金NM400耐磨钢卷板  

Development of low alloy NM400 wear-resistant steel strip based on 2 250 mm hot continuous rolling mill

作　　者：宿成 冯光宏[1] 袁晓鸣 王少炳 李钊 SU Cheng;FENG Guang-hong;YUAN Xiao-ming;WANG Shao-bing;LI Zhao(Metallurgical Technology Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Technology Center,Baotou Iron and Steel(Group)Co.,Ltd..Baotou 014010,Nei Mongol,China)

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081 [2]包头钢联股份有限责任公司技术中心,内蒙古包头014010

出　　处：《钢铁》2021年第2期126-131,共6页Iron and Steel

基　　金：国家重点研发计划资助项目(2017YFB0305103)。

摘　　要：为了开发具有成本优势的低合金高强薄规格耐磨钢卷板,利用目前国内先进的2 250mm热连轧产线的工艺特征,采用两阶段控制轧制后,分别采用前集中、前分散以及分段冷却3种控冷工艺,系统研究了在相同开冷温度下不同冷却速率和冷却路径对产品显微组织和力学性能的影响。结果表明,3种冷却模式中采用分段冷却较为合理,具体关键控制工艺为中间温度650℃、待温时间10s、两段冷速40℃/s以及卷取温度170℃,产品室温组织为以贝氏体为主、板条马氏体和铁素体为辅的混合组织,具有高强韧性和低屈强比的优势,各项性能满足GB/T 24186—2009要求和用户使用条件。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.

关 键 词：低合金耐磨钢 NM400 TMCP 冷却方式 组织与性能 

分 类 号：TG335.11[金属学及工艺—金属压力加工]