摘要
汽车行业亟需研发低成本、高性能、轻量化的车轮钢,为此对800 MPa车轮钢进行了研发。考虑合金元素的作用及为了充分利用攀枝花地区的钒资源,基于C-Mn-V-Nb-Cr化学成分体系设计了车轮钢的化学成分。设计了其生产控轧控冷工艺:板坯加热温度1200℃、保温2 h,粗轧温度1100~1000℃,共轧制3道次,压缩比为2.5;精轧温度860~830℃,共轧制6道次,压缩比为5.7;弛豫空冷15 s至750℃,然后水冷至430℃,再空冷至室温。对试制钢板的组织性能进行了检测和分析,结果表明:所试制钢板具有良好的力学性能,屈服强度690~720 MPa,抗拉强度860~870 MPa,屈强比0.80~0.88,伸长率20%~22%,在20~-60℃温度范围内冲击功不小于140 J,冷弯性能与扩孔性能均达到800 MPa级车轮用钢的标准要求。
To address the automotive industry's demand for low-cost,high-performance,and lightweight wheel steels,an 800 MPa grade wheel steel has been developed.The chemical composition was designed utilizing a C-Mn-V-Nb-Cr alloy system,with an emphasis on optimizing vanadium utilization in Panzhihua-region resources.A thermo-mechanical controlled process(TMCP)was implemented,involving the following parameters:slab heating at 1200℃for 2 h holding;roughing rolling at 1100-1000℃with three passes(compression ratio 2.5);finishing rolling at 860-830℃with six passes(compression ratio 5.7);followed by 15 s air cooling to 750℃,then water quenching to 430℃,and final air cooling to room temperature.Microstructural characterization and mechanical testing revealed excellent properties of the developed steel which yield strength is 690-720 MPa,tensile strength is 860-870 MPa,yield-to-tensile ratio is 0.80-0.88,and elongation is 20%-22%.Notably,the impact energy at temperatures ranging from 20℃to-60℃consistently exceeded 140 J.Both cold bending and hole expansion capabilities meet the stand requirements for 800 MPa grade wheel steels.
作者
李磊
吕兵
高彩茹
崔凯禹
杜林秀
彭存财
LI Lei;LÜBing;GAO Cairu;CUI Kaiyu;DU Linxiu;PENG Cuncai(Tianjin Aerospace Long March Rocket Macufacturing Co.,Ltd.,Tianjin 300462,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Panzhihua Steel Group Xichang Steel and Vanadium Co.,Ltd.,Panzhihua 615000,China;State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group,Panzhihua 617000,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150000,China)
出处
《轧钢》
北大核心
2025年第2期61-70,138,共11页
Steel Rolling
基金
国家重点研发计划项目(2022YFB3706400)。
关键词
钒微合金化
车轮钢
控轧控冷工艺
组织
性能
低成本
高性能
轻量化
vanadium microalloying
wheel steel
thermo-mechanical controlled process
microstructure
performance
low cost
high performance
lightweight
