焊接用钢ER70S-G小方坯连铸水口堵塞分析及其控制  

Analysis and Control of Nozzle Blockage in ER70S-G Small Billet Continuous Casting of Welding Steel

作　　者：徐兵伟 陈涛 郭新文[1] 王利军 Xu Bingwei;Chen Tao;Guo Xinwen;Wang Lijun(Shougang Changzhi Iron and Steel Co.,Ltd.,Changzhi Shanxi 046031,China;Shougang Research Institute of Technology,Beijing 100043,China)

机构地区：[1]首钢长治钢铁有限公司,山西长治046031 [2]首钢集团有限公司技术研究院,北京100043

出　　处：《山西冶金》2024年第9期38-41,共4页Shanxi Metallurgy

摘　　要：w(Ti)为0.12%~0.25%的焊接用钢ER70S-G,采用小方坯连铸生产工艺易发生浸入式水口结瘤问题,水口结瘤物的主要成分是Al_(2)O_(3)、Al_(2)O_(3)·MgO以及TiO_(2)。对冶炼、连铸过程钢水中夹杂物数量、尺寸和成分进行分析,发现精炼后期和中包浇注过程中小尺寸夹杂物的比例较高,说明夹杂物去除和钢水保护浇注效果差。通过采取提高转炉终点C含量、减少铝铁加入量、改变钛合金化方式、密封中间包和水口吹氩等措施,减少钢水中夹杂物,解决了ER70S-G小方坯连铸水口结瘤问题,铸坯质量完全满足下一步轧钢工序的要求。This article investigates the problem of submerged nozzle nodules that are prone to occur in the production process of ER70S-G welding steel with w(Ti)0.12%~0.25%using small billet continuous casting.The main component of nodules in the water outlet is Al_(2)O_(3)Al_(2)O_(3)·MgO and TiO_(2).Analyzing the number,size,and composition of inclusions in molten steel during smelting and continuous casting processes,as well as the number of furnaces with clogged water outlets,indicates a higher proportion of small and medium-sized inclusions in the later stages of refining and ladle casting,indicating poor effectiveness in removing inclusions and protecting molten steel during casting.Measures such as increasing the endpoint C content of the converter,reducing the amount of Al Fe added,changing the titanium alloying method,sealing the intermediate ladle and blowing argon at the nozzle were taken to reduce inclusions in the molten steel,solve the problem of nozzle nodulation in ER70S-G small billet continuous casting,and achieve smooth casting,which can smoothly produce qualified ER70S-G billets.

关 键 词：ER70S-G 钛 焊接用钢 水口堵塞 精炼 夹杂物 

分 类 号：TF764[冶金工程—钢铁冶金]