汽车板表面卷渣缺陷影响因素研究.pdfVIP

汽车板表面卷渣缺陷影响因素研究 王 畅 季晨曦 徐海卫 陈 斌 李 飞 朱国森 1 （首钢技术研究院薄板研究所，北京 100043 ） 摘 要 表面卷渣是连铸坯常见的表面缺陷，直接影响汽车板热轧卷的表面质量，决定钢板表面质量。通过统计分 析钢种，拉速，过热度等工艺条件的变化对热轧汽车板表面夹渣缺陷的影响效果，制订了保持结晶器内钢水的稳定 性、选择合适的保护渣，控制中间包过热度在20～35℃及控制稳定拉速1.1～1.2m/min 等措施，对汽车板表面缺陷 的控制起到了积极有效的作用。 关键词 汽车板 热轧卷 表面卷渣 Research of the Factors Affecting the Formation of Slag Inclusions on the surface of Auto Mobile Strip Wang Chang Ji Chenxi Xu Haiwei Chen Bin Li Fei Zhu Guosen (Department of Strip Technology，Shougang Technology Research Institute， Shougang General Company，Beijing, 100043) Abstract Surface inclusion is the commonly surface defect of continuous casting slab, affecting the surface quality of automobile sheet and determining the quality of hot rolled coil. Considering the effect of steel grades, casting speed and super heat in the tundish on the incidence rate of surface inclusion during the production of hot rolled coil, the variation of the process parameters and the incidence rate of the surface defect has been statistically analyzed. The optimization suggestion has been proposed, such as keeping the stability of mold level, choosing proper mold powder, keeping proper super heat 20~35 ℃in the tundish and casting by the constant speed 1.1~1.2m/min and so on. The incidence rate of the surface defect induced by surface inclusion decreased obviously. Key words automobile sheet, hot rolled coil, surface slag inclusion 1 引言 随着钢铁工业的发展，国内外多条热连轧、冷连轧生产线相继投产，钢铁下游企业对钢板表面质量的要 求不断提高，这些都给钢铁企业提出了更高的要求。 连铸过程结晶器内的保护渣、水口沉积物及其他非二次氧化产物, 由于各种原因被带入钢液, 部分被生 长的坯壳捕捉, 称之卷渣。卷渣造成的非金属夹杂物尺寸大、靠近铸坯表面, 成为高品质汽车板的主要表面 缺陷。铸坯表面的缺陷如果不清除掉，并且在加热炉内和轧制过程中没有随着氧化铁皮去除的话，这些缺陷 将