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钢厂使用原保护渣[/%:25.64CaO,22.72SiO_2,5.69MgO,8.29Al_2O_2,11.87(Na_2O+K_2O),5.49CaF_2,5.10BaO]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Al_2O_3对保护渣熔点的影响,CaF_2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,23.63SiO_2,4.76MgO,8.29Al_2O_3,11.90(Na_2O+K_2O),2.32CaF_2,4.18BaO],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。
The surface of the 300mm × 360mm mild steel slab produced by the steel mills using the original mold flux [/ %:25.64CaO, 22.72SiO_2, 5.69MgO, 8.29Al_2O_2, 11.87(Na_2O + K_2O), 5.49CaF_2, 5.10BaO] Mesh crack. By analyzing the correlation between the lubricating properties of billet and the metallurgical quality of billet, the influence of basicity, the influence of MgO and Al_2O_3 on the melting point of the billet, the influence of CaF_2 and alkaline earth metal compounds on the viscosity of the flux, : 22.06CaO, 23.63SiO_2, 4.76MgO, 8.29Al_2O_3, 11.90 (Na_2O + K_2O), 2.32CaF_2, 4.18BaO]. The results show that the thickness of the flux layer increases from 6 ~ 7.5 mm of the original mold flux to 7 ~ 10 mm, completely eliminating the web of the slab cracks.