大方坯连铸漏钢原因分析及控制研究  

Analysis and control of break out in the bloom continuous casting process

作　　者：陈寿红 刘林刚 姜东滨 李金柱 王亚栋 张立峰 CHEN Shouhong;LIU Lingang;JIANG Dongbin;LI Jinzhu;WANG Yadong;ZHANG Lifeng(Anning Co.,Ltd.of Kunming Iron&Steel Co.,Ltd.,Anning 650300,China;Technology Center of Kunming Iron&Steel Co.,Ltd.,Anning 650300,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Lab of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]昆明钢铁股份有限公司,安宁公司,云南安宁650300 [2]昆明钢铁股份有限公司技术中心,云南安宁650300 [3]北京科技大学冶金与生态工程学院,北京100083 [4]燕山大学,亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066044

出　　处：《炼钢》2020年第5期52-57,共6页Steelmaking

基　　金：中国国家重点研发计划专项资助项目(2017YFB0304001);青年科学基金项目(51904024);博士后科学基金面上项目(2018M641194);中央高校基本科研业务费项目(FRF-TP-18-098A1)。

摘　　要：针对Q235KZ钢230 mm×230 mm大方坯连铸二冷区频繁漏钢事故,采用扫描电镜、低倍腐蚀、成分分析、黏度测定、模拟计算等方法开展研究。研究发现连铸坯表面存在较长的纵裂纹,且漏钢坯壳附近存在夹渣。此外,发现结晶器内的初始凝固坯壳生长不均匀,在结晶器出口处最薄坯壳厚度为7.9 mm,最厚为20.2 mm。通过调整保护渣碱度、降低渣膜导热速率、优化二冷区水量分配,大方坯漏钢次数显著降低。Aiming at the frequent break out accidents in the second cooling zone of continuous casting bloom of Q235 KZ steel,the SEM,composition analysis,viscosity measurement,and simulation calculation were used for investigation.The results showed that longitudinal crack was found on the surface of bloom and the large-sized slag existed near the shell of breakout.Besides,it was found that the thickness of solidified shell was unevenly distributed.In the exit of the copper mold,the thickness of the thinnest shell was 7.9 mm,while that of the thickest was 20.2 mm.The frequency of break out was significantly reduced by increasing the alkalinity of protective slag,reducing the heat transfer rate of slag film,optimizing water distribution in the secondary cooling zone.

关 键 词：大方坯 连铸 漏钢 

分 类 号：TF777.2[冶金工程—钢铁冶金]