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  被引量:2

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

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作  者:曾亚南[1] 孙彦辉[1] 艾西[1] 马志飞[1] 刘瑞宁[2] 刘泳[2] 

机构地区:[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

出  处:《特殊钢》2014年第4期24-27,共4页Special Steel

摘  要:钢厂使用原保护渣[/%:25.64CaO,22.72Si02,5.69MgO,8.29A1202,11.87(Na20+K20),5.49CaF2,5.10BaO]生产的300mm×360mm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A1。0,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E/%:22.06CaO,23.63S102,4.76MgO,8.29A1203,11.90(Na20+K20),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—7.5mm提高到7—10mm,完全消除了连铸坯的网状裂纹。The surface of 300 mm ×360 mm low carbon steel casting bloom produced by using original mold powder [/% : 25.64 CaO, 22. 72SiO2, 5. 69MgO, 8. 29Al2O3 , 11.87 ( Na20 + K20), 5.49CaF2 , 5. lOBaO] easily produces network cracks at steel work. With analysis on the relativity between mold powder lubricating property and metallurgical quality of casting bloom and study on the influence of basicity, MgO and AlzO3 on melting point of mold powder and the in- fluence of Ca2F and alkali-earth oxide content on viscosity of mold powder, the optimum ingredient of mold powder [/% : 22. 06CaO, 23.63SiO2, 4. 76MgO, 8.29A1203, 11.90( Na20 + K20), 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 eompletaly eliminated. Material Index Low Carbon Steel, 300 mm ×360 mm Casting Bloom, Mold Powder, Viscosity, Melting Point, Ingredient Optimization

关 键 词:低碳钢 300 mm×360 mm连铸坯 结晶器保护渣 粘度 熔点 成分优化 

分 类 号:TF777[冶金工程—钢铁冶金]

 

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