汽车大梁钢610L的试制开发

Trial-manufacture and Development of Automobile Beam Steel 610L

按照低碳高锰微合金的成分设计原则,利用真空中频感应熔炼炉冶炼并浇铸成130mm×350mm的铸坯,经过12道次轧制成厚度为10mm的钢板,实验室试制了汽车大梁钢610L。检测分析表明:钢中出现了贝氏体组织,伸长率偏低。工业试制在降低氧含量的前提下进行了Si-Ca线变质处理,同时降低轧制温度和严格控冷,得到了以针状铁素体+珠光体为主的组织,晶粒度12级,其抗拉强度在625MPa以上,延伸率在24%以上,成功开发了高强度610L钢。

According to the composition design principle of low carbon,high manganese and microalloy,smelting in intermediate frequency induction furnace and casting to billets with the sizes 130 mm×350 mm,rolling to the plate with 10 mm thickness by 12 passes,the automobile beam steel 610L was trial-manufactured in the laboratory.The check and analysis showed bainite appeared in the steel microstructure and the percentage elongation was on the low side.On the base,reducing the oxygen content and making Si-Ca line modification,meanwhile,lowering the rolling temperature and controlling cooling strictly,industrial trial-manufactured plates had the microstructure of needle ferrite and pearlite and the grain size was 12 scales.The 610L steel with tensile intensity 625 MPa and percentage elongation 24% above was developed and produced successfully.