高强韧热轧贝氏体大H型钢性能及工艺研究  

Research on characteristics and process of hot rolled bainitic large H-beam steel with high strength and toughness

作　　者：周继顺 杨璐 潘红波[1,2] 刘伟明[1,2] 魏海莲 刘永刚[5] ZHOU Jishun;YANG Lu;PAN Hongbo;LIU Weiming;WEI Hailian;LIU Yonggang(Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education,Anhui University of Technology,Ma'anshan 243002,Anhui,China;Anhui Key Laboratory of Low Carbon Metallurgy and Solid Waste Resource Utilization,Anhui University of Technology,Ma'anshan 243002,Anhui,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education,Anhui University of Technology,Ma'anshan 243002,Anhui,China;School of Material Science and Engineering,Anhui University of Technology,Ma'anshan 243032,Anhui,China;Technology Center,Ma'anshan Iron and Steel Co.,Ltd.,Ma'anshan 243003,Anhui,China)

机构地区：[1]安徽工业大学冶金减排与资源综合利用教育部重点实验室,安徽马鞍山243002 [2]安徽工业大学安徽省低碳冶金与固废资源化利用重点实验室,安徽马鞍山243002 [3]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [4]安徽工业大学材料科学与工程学院,安徽马鞍山243032 [5]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243003

出　　处：《钢铁研究学报》2024年第8期1050-1059,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(U1860105,51774006);安徽省重点研发计划资助项目(202304a05020026)。

摘　　要：设计了一种含Nb低CSiMnCuNi合金热轧贝氏体大H型钢。结合H型钢生产工艺,探讨了轧制温度、压下率与冷却方式对大H型钢组织及力学性能影响。结果表明:空冷条件下厚规格大H型钢获得粗大粒状贝氏体与少量铁素体、板条贝氏体,铁素体晶粒10~15μm,M/A岛尺寸3~5μm,屈服强度为531MPa,冲击功与温度呈陡峭下降趋势,-40℃时冲击功仅为40J。轧后水冷的厚规格大H型钢获得细小板条贝氏体、粒状贝氏体与少量铁素体,M/A相呈点状分布,铁素体晶粒在6~10μm之间,屈服强度达662MPa,冲击功随温度呈缓慢下降趋势,-40℃时冲击功为194J。薄规格大H型钢通过大压下得到更为细小的粒状贝氏体与铁素体,屈服强度为625MPa,冲击功与试验温度几乎呈水平直线,-40℃时冲击功高达262J。A kind of the hot rolled large H-beam steel with low CSiMnCuNi alloy system bearing Nb was designed.Based on the production process of the hot-rolled large H-beam steel,the effects of rolling temperature,reduction rate,and cooling method on the microstructure and mechanical properties of large H-beam steel were explored.The results show that the microstructure consisting on coarse granular bainite with M/A island size of about 3-5μm,a small amount of ferrite with grain size of 10-15μm,lath bainite and the mechanical property with the yield strength of 531 MPa are obtained from thick gauge and large H-beam steel under air cooling condition.Furthermore,the impact energy shows a steep decline trend with the experimental temperature and the impact energy is only 40J at-40℃.However,the microstructure consisting on fine lath bainite,granular bainite with distributing M/A island like dotting shape,a small amount of ferrite with grain size of 6-10μm and the mechanical property with the yield strength of 662MPa are obtained from thick gauge and large H-beam steel under water cooling condition.In correspondingly,the impact energy slowly decreases with temperature and the impact energy is 194J at-40℃.The thinner specifications large H-beam steel with a large reduction ratio show a more fine-granular bainitic,ferrite microstructure and a more excellent comprehensive mechanical property with yield strength of 625MPa.Also,the impact energy is almost in a level straight line with the experimental temperature,and reaches 262 J at-40℃.

关 键 词：大规格H型钢 贝氏体 高强韧性 微合金化 轧制工艺 

分 类 号：TG142.1[一般工业技术—材料科学与工程]