IF钢铸坯洁净度研究.pdfVIP

IF 钢铸坯洁净度研究 1 1 1 2 3 刘柏松 朱国森 陈 斌 崔 衡 青 靓 （1．首钢技术研究院，北京 100043 ；2 ．北京科技大学冶金工程研究院，北京 100083 ； 3 ．河北省首钢迁安钢铁有限责任公司，迁安 064404 ） 摘 要 为了研究“开浇”这一非稳态因素对钢水洁净度的影响，对长10m 的头坯进行了密集取样分析。研究发现， 头坯中碳、氮、全氧含量沿拉坯方向7.5m 以后的位置达到稳定状态；碳、氮、全氧含量在头坯厚度方向上的分布， 超过5.5m 长度以后趋于均匀，此前则差别较大。通过原位分析方法，研究铸坯表层夹杂物数量和粒度的变化规律 后发现，铸坯合理的表层机清厚度是3.5mm 。 关键词 IF 钢 连铸 洁净度 夹杂物 Study on Cleanliness of Slabs for IF Steel Liu Baisong1 Zhu Guosen1 Chen Bin1 Cui Heng2 Qing Jing3 (1. Shougang Research Institute of Technology，Beijing, 100043; 2. Research Institute of Metallurgical Engineering, University of Science and Technology Beijing, Beijing, 100083; 3. Heibei Shougang Qian’an Iron Steel Co.,Ltd., Qian’an, 064404) Abstract In order to study the impact of so-called “casting-starting stage” in continuous casting and to enhance the cleanliness, the close-packed sampling and analysis of the first slab with the length of 10m were carried out. The results indicated that carbon, nitrogen and total oxygen contents in the first slab reached steady state beyond 7.5m along the casting direction. And beyond 5.5m, the carbon, nitrogen and total oxygen contents getting uniform distributed in thickness direction. By the original position statistic distribution analysis (OPA), the rules of amounts and granularity of inclusions in the slab surface layer were investigated. It is found that the reasonable thickness of scarfing is 3.5mm. Key words IF steel, continuous casting, cleanliness, inclusion 1 引言 近年来，超低碳IF 钢得到了迅猛发展，被广泛应用于汽车、家电等制品。对于汽车外板等制品来说， [1～4] 良好的表面质量尤为重要，而钢中的非金属夹杂