结晶器保护渣对300mm×360mm低碳钢连铸坯表面质量的影响和成分优化

特殊钢 ›› 2014, Vol. 35 ›› Issue (4): 24-27.

结晶器保护渣对300mm×360mm低碳钢连铸坯表面质量的影响和成分优化

曾亚南¹, 孙彦辉¹, 艾西¹, 马志飞¹, 刘瑞宁², 刘泳²

1北京科技大学冶金与生态工程学院，北京100083；
2河北钢铁集团石家庄钢铁有限责任公司,石家庄050031

收稿日期:2014-02-09 出版日期:2014-08-01 发布日期:2022-09-03
作者简介:曾亚南(1983-),男，博士研究生(北京科技大学)，2006年河北理工大学(本科)毕业，炼钢新工艺及铸坯质量控制研究。

Effect of Mold Powder on Surface Quality of 300 mm x 360 mm Casting Bloom of Low Carbon Steel and Ingredient Optimization

Zeng Yanan¹, Sun Yanhui¹, Ai Xi¹, Ma Zhifei¹, Liu Reining², Liu Yong²

1 School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083 ；
2 Shijiazhuang Iron and Steel Co Ltd, Hebei Iron and Steel Group, Shijiazhuang 050031

Received:2014-02-09 Published:2014-08-01 Online:2022-09-03

摘要/Abstract

摘要： 钢厂使用原保护渣[/%:25.64CaO,22.72SiO₂,5.69MgO,8.29Al₂O₃,11.87(Na₂O+K₂O),5.49CaF₂,5.10BaO]生产的300mm×360 mm低碳钢连铸坯表面易产生网状裂纹。通过分析保护渣润滑性能与铸坯冶金质量之相关性和研究碱度、MgO和Al₂O₃对保护渣熔点的影响,CaF₂和碱土金属化合物含量对保护渣粘度影响,优化了保护渣的成分[/%:22.06CaO,23.63SiO₂,4.76MgO,8.29Al₂O₃,11.90(Na₂O+K₂O),2.32CaF₂,4.18BaO],应用结果表明,使保护渣液层的厚度由原保护渣的6~7.5 mm提高到7~10 mm,完全消除了连铸坯的网状裂纹。

Abstract: The surface of 300 mm x 360 mm low carbon steel casting bloom produced by using original mold powder [/%: 25. 64 CaO, 22. 72SiO₂, 5. 69MgO, 8.29Al₂O₃, 11. 87 (Na₂O + K₂O), 5. 49CaF₂, 5. 10BaO] easily produces network cracks at steel work. With analysis on 由e relativity between mold powder lubricating property and metallurgical quality of casting bloom and study on the influence of basicity, MgO and Al2 03 on melting point of mold powder and the influence of Ca₂F and alkali-earth oxide content on viscosity of mold powder, the optimum ingredient of mold powder [/%: 22. 06CaO, 23. 63SiO₂,4. 76MgO, 8. 29Al₂O₃, 11. 90 (Na₂O + K₂O), 2. 32CaF₂,4. 18BaO] is defined. The application results show that as the thickness of liquid slag layer increases to 7 ~ 10 mm from original slag 6 ~ 7. 5 mm, the casting bloom surface network is completely eliminated.

曾亚南, 孙彦辉, 艾西, 马志飞, 刘瑞宁, 刘泳. 结晶器保护渣对300mm×360mm低碳钢连铸坯表面质量的影响和成分优化[J]. 特殊钢, 2014, 35(4): 24-27.

Zeng Yanan, Sun Yanhui , Ai Xi, Ma Zhifei, Liu Reining , Liu Yong. Effect of Mold Powder on Surface Quality of 300 mm x 360 mm Casting Bloom of Low Carbon Steel and Ingredient Optimization[J]. Special Steel, 2014, 35(4): 24-27.