汽车底盘用高强度复相钢HR680/800CP的开发与应用  

Development and application of high strength complex phase steel HR680/800CP for automobile chassis

作　　者：谭大庆[1] 周莉[1] 贾国翔 曹晓恩 文才君 薛仁杰 Tan Daqing;Zhou Li;Jia Guoxiang;Cao Xiao’en;Wen Caijun;Xue Renjie(School of Mechanical Engineering and Automation,Chongqing Industry Polytechnic College,Chongqing 401120,China;Hanbao Steel Plant,Han Steel Company,HBIS Group,Handan 056015,Hebei,China;Technology Center,Han Steel Company,HBIS Group,Handan 056015,Hebei,China;School of Material Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]重庆工业职业技术学院机械工程与自动化学院,重庆401120 [2]河钢集团邯钢公司邯宝炼钢厂,河北邯郸056015 [3]河钢集团邯钢公司技术中心,河北邯郸056015 [4]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《钢铁钒钛》2023年第4期167-172,共6页Iron Steel Vanadium Titanium

基　　金：重庆市教委科学技术研究项目(KJQN202103211)。

摘　　要：顺应汽车轻量化发展需求,综合考虑汽车底盘结构件成型工艺特点,采用低C-Si-Mn-Nb-Ti-Mo复合成分体系设计实现良好焊接性能、第二相析出强化效果及促进中温贝氏体相变。通过理论计算制定热轧控轧控冷工艺,按照精轧终轧温度890℃、卷取温度570℃及前段3/4层流冷却模式,实现奥氏体区轧制稳定性、主要发生贝氏体相变,成功开发了铁素体/贝氏体为主、屈服强度769 MPa、抗拉强度840 MPa、延伸率17.92%、扩孔率高达110%、具有良好凸缘翻边和扩孔性能的高强度复相钢HR680/800CP,并成功应用于某车型底盘控制臂和新能源电池包支架。Considering lightweight requirement and forming process characteristics of chassis structural parts,a complex alloying system of C-Si-Mn-Nb-Ti-Mo elements had been designed in order to achieve a better performance of weldability,second phase precipitation and bainite transformation at intermediate temperature.Based on theoretically calculation,a TMCP process where FET and CT are set at 890℃and 570℃and uses laminar cooling mode front 3/4,had been developed.During the TMCP process stable rolling steps were within austenite phase zone,and ferrite and bainite transformation occurred upon cooling period during and after laminar process.As a result HR680/800CP was produced which is featured with well flanging and hole expansion property.Microstructure mainly consists of Ferrite/Bainite,and mechanical properties reaches yield strength 769 MPa,tensile strength 840 MPa,elongation 17.92%,hole expansion ratio up to 110%.This product has been successfully used for structure parts of chassis control arm and battery pack bracket in new energy automobile.

关 键 词：复相钢 控轧控冷工艺 贝氏体 晶粒取向 扩孔性能 

分 类 号：TF76[冶金工程—钢铁冶金]