舞钢连铸板坯皮下气泡缺陷的成因分析与控制  

The Causes Analysis and Control of the Subsurface Blowhole Defects in Continuous Casting Slab Produced by Wusteel

作　　者：刘小军 李杰 刘德胜 郑京辉 Liu Xiaojun;Li Jie;Liu Desheng;Zheng Jinghui(HBIS Group Wusteel Company;HBIS Group Steel Research Institute)

机构地区：[1]河钢集团舞钢公司 [2]河钢集团钢研总院

出　　处：《宽厚板》2021年第1期33-36,共4页Wide and Heavy Plate

摘　　要：对舞钢生产连铸板坯的皮下气泡缺陷进行分析,发现气泡形状、位置以及产生原因与钢液气体含量、过热度、辅料含水量、浸入式水口形状及插入深度等因素有关。通过一系列工艺优化措施,例如提高过热度达标率、控制辅料含水量、优化浸入式水口形状和插入深度、改善结晶器保护渣透气性,将铸坯皮下气泡缺陷发生率降低30%以上。Analysis is performed on the subsurface blowhole defects of continuous casting slab produced by Wusteel,which reveals the shape,position,cause of the blowhole are related to the gas content in molten steel,superheat,moisture content in auxiliary materials,shape and insertion depth of submerged nozzle.Through a series of process optimization,i.e.,increasing the superheat hit ratio,controlling the moisture content in auxiliary materials,optimizing the shape and insertion depth of the submerged nozzle,improving the gas permeability of mold powder,the occurrence rate of subsurface blowhole defects of the slab is reduced by more than 30%.

关 键 词：连铸坯 皮下气泡 保护渣 

分 类 号：TF777[冶金工程—钢铁冶金]