异型坯连铸机Q235B生产实践及工艺  

Practice and process research of Q235B on beam blank caster

作　　者：宁英衣 NING Ying-yi(Fujian Luoyuan Minguang Iron and Steel Co.,Ltd.,Fuzhou 350000,Fujian,China)

机构地区：[1]福建罗源闽光钢铁有限责任公司,福建福州350000

出　　处：《连铸》2023年第1期118-123,共6页Continuous Casting

摘　　要：为给型钢提供优质的铸坯,减少腹板裂纹、中心疏松等质量缺陷发生,研究了Q235B生产过程中的工艺条件,掌握了铸坯腹板裂纹和中心疏松产生的机理。通过控制钢水成分和洁净度、优化结晶器冷却及二次冷却工艺、优化保护渣工艺及水口插入深度等措施,保证铸坯在凝固过程中实现冷却均匀,降低铸坯表面温降,有效杜绝了铸坯表面腹板裂纹的发生,铸坯中心疏松等级控制在1.0以下。In order to provide high quality casting billet for section steel and reduce the occurrence of quality defects such as web crack and center loose,the technological conditions in the production process of Q235B were studied,and the mechanism of web crack and center loose of casting billet was mastered.By controlling the composition and purity of molten steel,optimizing the mold cooling and secondary cooling process,optimizing the slag protection process and the water outlet insertion depth,the casting billet can achieve uniform cooling during the solidification process,reduce the surface temperature drop of the casting billet,effectively eliminate the web cracks on the surface of the casting billet,and control the center porosity level of the casting billet below 1.0.

关 键 词：Q235B 保护渣 结晶器冷却 二次冷却 腹板裂纹 中心疏松 

分 类 号：TF777[冶金工程—钢铁冶金]