薄板坯连铸连轧生产线75Cr1连铸工艺优化  

Optimization of 75Cr1 Continuous Casting Process in Thin Slab Continuous Casting Line

作　　者：戴智才[1] 罗钢[1] 肖磊 曾斌[1] DAI Zhicai;LUO Gang;XIAO Lei;ZENG Bin(Technical Center of Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417009,Hunan)

机构地区：[1]湖南华菱涟源钢铁有限公司技术中心,湖南娄底417009

出　　处：《金属材料与冶金工程》2022年第6期47-52,共6页Metal Materials and Metallurgy Engineering

摘　　要：本文针对薄板坯连铸连轧生产线(CSP)生产75Cr1时铸坯及带钢发生表面横裂纹缺陷的现象,结合相同工艺条件下其他高碳钢的质量情况,研究了75Cr1铸坯及带钢表面产生横裂纹缺陷的相关机理。同时根据铸坯冷却及带钢表面横裂纹缺陷分布情况,总结出75Cr1铸坯存在宽度方向冷却不均及冷却强度不足的问题。通过采取液芯压下(LCR)及根据扇形段二冷段喷嘴的布置优化了连铸二冷宽度方向的冷却修正系数,铸坯冷却效果得到改善,解决了75Cr1带钢表面横裂纹质量缺陷。Aiming at the transverse crack on the surface of 75Cr1 slab and strip steel produced by thin slab continuous casting and rolling production line(CSP),combined with the quality of other high carbon steels under the same process conditions,the relevant mechanism of transverse crack is studied in this paper. Meanwhile, according to the slab cooling and the distribution of transverse cracks,it is concluded that there are problems of uneven cooling in width direction and insufficient cooling intensity. By adopting LCR and optimizing the cooling correction coefficient in the width direction of secondary cooling section of continuous casting according to the layout of secondary cooling section nozzle in sector section,the slab cooling effect is improved,and the quality defect of transverse crack on the surface of 75Cr1 strip steel is solved.

关 键 词：高碳钢 液芯压下 二次冷却 修正系数 表面横裂纹 

分 类 号：TF777.7[冶金工程—钢铁冶金] TG335.55[金属学及工艺—金属压力加工]