Nb-Ti微合金化610 MPa级汽车大梁钢板工艺研究  

Study on the production process of 610 MPa grade Nb-Ti micro-alloy hot rolled plate for auto beam by FTSR line

作　　者：卢军辉[1] 王晓春[2] 张慧[1] 张成武[2] 刘家琪[1] 朴峰云[2] 仇圣桃[1] 

机构地区：[1]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081 [2]通化钢铁股份有限公司技术中心,吉林通化134000

出　　处：《炼钢》2011年第4期61-64,共4页Steelmaking

摘　　要：通过设计合理的化学成分,采用铁水预处理→120t转炉→LF精炼→FTSR(Flexible Thin Slab Rolling,灵活的薄板坯连铸连轧)连铸机(87.5mm厚薄板坯)→2机架粗轧+5机架精轧→卷取工艺流程,借助全流程TMCP(Thermo Mechanical Control Process,热机械控制工艺),成功生产了610MPa级汽车大梁钢。检验结果表明:钢板组织为铁素体+贝氏体+少量马氏体和残余奥氏体组元,晶粒尺寸2.08μm;板卷各项力学性能均能满足要求。对冲击断口做扫描电镜发现,冲击断口为韧性断口,且韧窝底部有球形CaS质点。The 610 MPa grade hot rolled steel for auto beam use has been studied and produced by proper design of chemical compositions of the steel and adoption of the processing route of hot metal pre-treatment→ 120 t top and bottom combined blown converter→ LF refining→ FTSR （Flexible Thin Slab Rolling） continuous casting machine→2R ＋ 5F mill coiling with TMCP process. The examination results show that the structure of plate consists of ferrite ＋ bainite ＋ minor MA with grain size 2. 08 μm. And the mechanical properties of the steel grade are in conformity to the standard requirements. By way of SEM observation it is found that the impact fracture belongs to the toughness fracture and at the bottom of the toughness dimples exist many spherical micro CaS particles.

关 键 词：Nb-Ti微合金化 FTSR工艺 610 MPA级 汽车大梁用钢 

分 类 号：TF777.7[冶金工程—钢铁冶金]