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.
出处
《炼钢》
CAS
北大核心
2011年第4期61-64,共4页
Steelmaking
