宽厚连铸板坯角部裂纹控制技术开发  

Development of corner crack control technology for continuous casting strand of wide-thick plate

作　　者：何宇明 胡兵 周宏 王谦[4] 张慧[5] 

机构地区：[1]重庆钢铁股份有限公司一炼钢厂,重庆401258 [2]重庆钢铁股份有限公司钢铁研究所,重庆401258 [3]重庆钢铁股份有限公司总工程师办公室,重庆401258 [4]重庆大学材料科学与工程学院,重庆400044 [5]钢铁研究总院连铸技术国家工程研究中心,北京100081

出　　处：《钢铁》2016年第7期34-40,共7页Iron and Steel

摘　　要：针对直弧型大型连铸机钢液中夹杂物更容易上浮到结晶器液面,有利于降低板坯中的夹杂物质量分数,生产宽厚板坯时角部容易出现横裂纹也容易出现纵裂纹的特点,重钢3号连铸机通过大倒角结晶器技术开发、直弧型连铸机对弧技术优化、板坯宽窄面鼓肚预防等工作降低坯壳所受到的应力;通过大倒角结晶器开发、二冷喷嘴布置优化、二冷动态配水等工作,使板坯温度避开钢的第三脆性区。这两方面综合作用的结果是,2014年2月至12月板坯角部裂纹率为零,解决了板坯角部横裂纹和纵裂纹问题。For large-scale straight-curve type slab continuous caster, inclusions in moten steel are more likely to float to- wards the meniscus and be removed, which is help for the reduction of inclusions content in the strand. Meanwhile, the comer crack and longitudinal crack are easy to occur during the production of wide-thick slab. In the light of the above, Chongqing steel No.3 continuous caster developed some technologies, such as the adoption of chamfered mold, the im- provement of collating radian precision, the prevention of bulging on the narrow and wide faces, the optimization of the nozzles in secondary cooling zone and the dynamic secondary cooling water mode, to decrease the stress on the solidify- ing shell and make the strand away from the third brittle zone. From February to December 2014, the ratio of comer crack was zero, and the problems of corner crack and longitudinal crack have been solved.

关 键 词：宽厚板坯 直弧型连铸机 角部裂纹 大倒角结晶器 对弧技术 

分 类 号：TF777[冶金工程—钢铁冶金]