小方坯连铸中碳钢铸坯表面缺陷与保护渣性能选择  

Surface Defect of Billet and Property of Protecting Slag for Continuous Casting of Medium Carbon Steel

作　　者：孔祥涛[1] 周德[1] 陈宏[2] 张宝全[2] 诸葛铭毅[1] 孙其松[1] 

机构地区：[1]首钢技术研究院,北京100043 [2]首钢第二炼钢厂,北京100041

出　　处：《钢铁》2010年第8期99-103,共5页Iron and Steel

摘　　要：首钢二炼钢160 mm×160 mm小方坯连铸使用高碳钢类型FRK-45型保护渣生产碳质量分数为0.35%~0.50%钢时,连铸坯表面出现大量的纵向裂纹和横向凹坑缺陷。通过降低连铸机拉速,提高保护渣的碱度,延缓保护渣熔化速度,改善铸坯坯壳与结晶器壁之间渣膜的传热等技术措施,使铸坯的表面缺陷得到了有效的控制。A lot of surface longitudinal cracks and transverse pits were observed on 160 mm×160 mm billets containing 0.35%-0.50% carbon,which was produced using high carbon steel protecting slag in No.2 steelmaking plant of Shougang Group.These surface defects have been effectively controlled by improving the basicity of mould powder,prolonging the dissolve rate of mould powder and improving the heat transfer between mould wall and billet shell.

关 键 词：中碳钢 连铸 保护渣 表面缺陷 

分 类 号：TF777.3[冶金工程—钢铁冶金]