钛稳定化321不锈钢连铸结晶器“结鱼”的研究  

A Study on Floater in Mould during Concasting Ti Stabilized Stainless Steel 321

作　　者：郑宏光[1] 陈伟庆[1] 陈宏[1] 李志斌[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]太原钢铁公司,太原030003

出　　处：《特殊钢》2004年第4期50-52,共3页Special Steel

基　　金：国家自然科学基金;上海宝钢集团公司联合资助;项目批准号 :5 0 3740 1

摘　　要：用扫描电镜分析了钛稳定化 32 1铬镍奥氏体不锈钢板坯连铸过程中结晶器中形成的“结鱼”的物相组成 ,探讨了“结鱼”形成机理和预防措施。结果表明 ,连铸过程钢水中已形成的TiN在结晶器内聚集 ,并与保护渣中SiO2 和Fe2 O3等氧化物反应放出氮气 ,由于是吸热反应 ,促使局部钢水冷却凝固形成“结鱼” 悬浮钢块。保持钢中 [Ti% ]·[N % ]× 10 3<3 5 ,Alsol≤ 0 .0 1%时 ,可避免形成“结鱼”。The phase compositions of floater formed in mould during concasting Ti stabilized austenite stainless steel 321 are analyzed by scanning electron microscope and the mechanism of floater and preventive measures are discussed. The results show that TiN inclusions formed in molten steel during concasting accumulate in mould and react with oxides - SiO 2 and Fe 2O 3 in flux to release nitrogen, and this is an endothermal reaction which promotes solidification of local molten steel to form floater.As [Ti%]·[N%] × 103 was less than 3.5 and Al sol in steel was no more than 0.01%,the floater hadn't been found in molten steel.

关 键 词：不锈钢 结晶器 扫描电镜 钛稳定化 板坯连铸 悬浮钢块 “结鱼” 

分 类 号：TF777[冶金工程—钢铁冶金]