D0L:10.13374.issn1001-053x.2013.06.015 第35卷第6期 北京科技大学学报 Vol.35 No.6 2013年6月 Journal of University of Science and Technology Beijing Jun.2013 转炉冶炼CaO-SiO,-FeO渣系中磷的行为 林路12)，包燕平12)☒，王敏1,2)，周寒梅1,2)，张立强12) 1)北京科技大学钢铁冶金新技术国家重点实验室，北京100083 2)北京科技大学治金与生态工程学院，北京100083 ☒通信作者，E-mai让：baoyp@ustb.edu.cn 摘要回归推导出渣系中磷酸盐容量对数与炉渣光学碱度和温度的关系表达式，通过回归公式绘制出CO-SiO2- FO(10%MgO)渣系的等磷酸盐容量图，分析了转炉终渣、终点成分及温度对钢中磷含量的影响情况.当熔渣磷酸盐容 量一定时，随着转炉终点碳含量降低，渣/钢间磷分配比增加：相同终点碳含量时，随着熔渣磷酸盐容量增加，渣/钢间 磷分配比增加：转炉终点碳质量分数控制在0.03%0.04%，炉渣碱度大于3.5，渣中F0质量分数低于18%，渣中P2O5 质量分数低于2%，有利于获得终点磷质量分数在0.008%以内的钢水. 关键词炼钢：脱磷：渣：磷酸盐：光学碱度：回归分析 分类号T℉704.4 Phosphorus behavior in CaO-SiO2-FeO slag during converter melting process LIN Lu 1.2),BAO Yan-ping 1.2),WANG Min 1,2),ZHOU Han-mei 12),ZHANG Li-giang 1.2) 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 2)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:baoyp@ustb.edu.cn ABSTRACT An expression was regressed to describe the relation of phosphate capacity in slag to slag's optical basicity and temperature.An iso-phosphate capacity graph of the CaO-SiO2-FeO(10%MgO)slag system was depicted by the regression expression.The effect of converter end-point slag,end-point composition and temperature on the phosphorus content in steel was analyzed.When the phosphate capacity in slag is constant,the distribution ratio of phosphorus between slag and steel increases with the converter final carbon content decreasing:but at a constant final carbon content,with the increase of phosphate capacity in slag,the distribution ratio of phosphorus between slag and steel increases.It is suggested that the final carbon content is controlled between 0.03%and 0.04%,the slag basicity is more than 3.5,the FeO content in slag is less than 18%.and the P2Os content in slag is less than 2%.which are favorable for producing liquid steel with the final phosphorus content less than 0.008%. KEY WORDS steelmaking:dephosphorization;slag;phosphates;optical basicity;regression analysis 钢中磷对绝大多数钢种来说有害，P会显著降 在炼钢氧化脱磷过程中，钢中磷进入渣中一般 低钢的韧性，过量的P会在晶界偏析，在加工过以PO?~存在.研究转炉熔渣溶磷特性对炼钢过 程中形成冷脆，极大地影响钢材的使用性能.随着程磷的控制以及生产低磷钢和超低磷钢尤为重要. 钢铁用户对产品质量要求的逐步提高，成品钢中 本文研究了磷酸盐容量与熔渣光学碱度和温度的 P的限制越来越严格.一般钢材对P的要求都在 关系，讨论了转炉终点熔渣性质对钢中磷含量的 0.015%以下，汽车板、管线钢等都要求P<0.01%,影响. 特殊耐腐蚀条件下的钢板甚至要求P<0.005%). 收稿日期：2012-03-01第 35 卷 第 6 期 北 京 科 技 大 学 学 报 Vol. 35 No. 6 2013 年 6 月 Journal of University of Science and Technology Beijing Jun. 2013 转炉冶炼 CaO-SiO2-FeO 渣系中磷的行为 林 路1,2)，包燕平1,2) ，王 敏1,2)，周寒梅1,2)，张立强1,2) 1) 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083 2) 北京科技大学冶金与生态工程学院，北京 100083 通信作者，E-mail: baoyp@ustb.edu.cn 摘 要 回归推导出渣系中磷酸盐容量对数与炉渣光学碱度和温度的关系表达式，通过回归公式绘制出 CaO-SiO2- FeO(10% MgO) 渣系的等磷酸盐容量图，分析了转炉终渣、终点成分及温度对钢中磷含量的影响情况. 当熔渣磷酸盐容 量一定时，随着转炉终点碳含量降低，渣/钢间磷分配比增加；相同终点碳含量时，随着熔渣磷酸盐容量增加，渣/钢间 磷分配比增加；转炉终点碳质量分数控制在 0.03%∼0.04%，炉渣碱度大于 3.5，渣中 FeO 质量分数低于 18%，渣中 P2O5 质量分数低于 2%，有利于获得终点磷质量分数在 0.008%以内的钢水. 关键词 炼钢；脱磷；渣；磷酸盐；光学碱度；回归分析 分类号 TF704.4 Phosphorus behavior in CaO-SiO2-FeO slag during converter melting process LIN Lu 1,2), BAO Yan-ping 1,2) , WANG Min 1,2), ZHOU Han-mei 1,2), ZHANG Li-qiang 1,2) 1) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 2) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China Corresponding author, E-mail: baoyp@ustb.edu.cn ABSTRACT An expression was regressed to describe the relation of phosphate capacity in slag to slag’s optical basicity and temperature. An iso-phosphate capacity graph of the CaO-SiO2-FeO (10% MgO) slag system was depicted by the regression expression. The effect of converter end-point slag, end-point composition and temperature on the phosphorus content in steel was analyzed. When the phosphate capacity in slag is constant, the distribution ratio of phosphorus between slag and steel increases with the converter final carbon content decreasing; but at a constant final carbon content, with the increase of phosphate capacity in slag, the distribution ratio of phosphorus between slag and steel increases. It is suggested that the final carbon content is controlled between 0.03% and 0.04%, the slag basicity is more than 3.5, the FeO content in slag is less than 18%, and the P2O5 content in slag is less than 2%, which are favorable for producing liquid steel with the final phosphorus content less than 0.008%. KEY WORDS steelmaking; dephosphorization; slag; phosphates; optical basicity; regression analysis 钢中磷对绝大多数钢种来说有害，P 会显著降 低钢的韧性，过量的 P 会在晶界偏析，在加工过 程中形成冷脆，极大地影响钢材的使用性能. 随着 钢铁用户对产品质量要求的逐步提高，成品钢中 P 的限制越来越严格. 一般钢材对 P 的要求都在 0.015%以下，汽车板、管线钢等都要求 P<0.01%， 特殊耐腐蚀条件下的钢板甚至要求 P<0.005%[1] . 在炼钢氧化脱磷过程中，钢中磷进入渣中一般 以 PO3− 4 存在. 研究转炉熔渣溶磷特性对炼钢过 程磷的控制以及生产低磷钢和超低磷钢尤为重要. 本文研究了磷酸盐容量与熔渣光学碱度和温度的 关系，讨论了转炉终点熔渣性质对钢中磷含量的 影响. 收稿日期：2012–03–01 DOI:10.13374/j.issn1001-053x.2013.06.015