铸坯中间裂纹影响因素的多元回归分析
Multiple Regression Analysis of Influence Factors on Intermediate Crack in Continuous Casting Slab
李雪洁1， 袁守谦1， 王 超1， 李都宏2
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作者单位：（1.西安建筑科技大学 冶金工程学院，陕西 西安 710055；2.陕西龙门钢铁集团公司，陕西 韩城 715405）
中文关键字： 连铸坯； 中间裂纹； 多元回归分析
英文关键字：continuous casting slab; intermediate crack; multiple regression analysis
中文摘要：采用多元线性回归方法，对陕西龙钢连铸拉坯过程中实际生产数据进行分析，得到Q235钢铸坯中间裂纹级别与钢水中C、Si、Mn、S、P的含量、连铸主要工艺参数如钢水温度、拉坯速度、比水量的多元线性回归方程。结果表明：C和Mn的含量以及拉坯速度是影响Q235钢铸坯中间裂纹级别的最主要的因素，其他因素对其影响较小；控制好C含量，适当减少Mn含量，适当降低并稳定拉速，有利于改善铸坯中间裂纹。
英文摘要：Based on multivariate linear regression analysis, the practical production data from casting course of continuous casting slab in Shaanxi Longmen Iron and Steel Plant were analyzed, a group of multivariate linear regression equations were established, which were the intermediate crack level of Q235 steel vs its effects, such as C, Si, Mn, S, P content in molten steel, molten steel temperature, casting speed and water flow rate. The results show that the content of C and Mn and the casting speed are the most important factors affecting intermediate crack of Q235 steel slab; strictly controlling C content, appropriately reducing Mn content, moderately reducing and stabilizing casting speed help to improve the appearance of intermediate crack in the slab.