20Mn2钢钙处理过程钙铝比对夹杂物转变的影响

炼钢 ›› 2015, Vol. 31 ›› Issue (3): 36-40.

20Mn2钢钙处理过程钙铝比对夹杂物转变的影响

郭宝奇¹,包燕平²,王敏³,林路⁴

北京科技大学钢铁冶金新技术国家重点实验室，北京 100083

收稿日期:2014-08-11 修回日期:2014-10-22 接受日期:1900-01-01 出版日期:2015-06-05 发布日期:2015-06-08
通讯作者: 包燕平 E-mail:baoyp@ustb.edu.cn

Effects of w(Ca)/ w(Al) on transformation of inclusions in the calcium treatment in 20Mn2 steel

Received:2014-08-11 Revised:2014-10-22 Accepted:1900-01-01 Online:2015-06-05 Published:2015-06-08

摘要/Abstract

摘要： 钙铝比是表征钙处理效果与喂入钙线量的重要指标，利用FactSage热力学软件对影响钙处理过程的因素包括温度、氧含量、硫含量进行了系统研究，得出各个因素对钙处理过程夹杂物转变的影响。在不同钙铝比的条件下，对20Mn2钢中夹杂物的析出过程分别进行分析，得出在w(Ca)/ w(Al)=0.10时，夹杂物的液化程度最高，液相温度区间最大，钙处理效果最佳。针对20Mn2钢的合理钙铝比0.10进行工业试验并取样分析，得出夹杂物的内部成分与形核的温度区间有关，外层区域含有在降温过程析出的CaS，同时钙处理后钢中夹杂物的数量下降，平均直径有升高的趋势。

关键词: 钙处理, 低碳含铝钢, 钙铝比, 夹杂物

Abstract: w(Ca)/w(Al) is an essential parameter in assessment of calcium treatment and the amount of calcium fed into molten steel. FactSage software was employed to systematically study the factors including temperature, oxygen content and sulfur content which affect the process of calcium treatment, and the relevant effects were obtained. With different w(Ca)/w(Al) the precipitations of inclusions were analyzed in 20Mn2 steel, and it was shown that when the w(Ca)/w(Al) reached 0.10, liquefaction extent of inclusions was highest and temperature interval of liquid phase arrived at maximum value. In the case of w(Ca)/w(Al)=0.10, steel specimen was sampled and analyzed. It was indicated that inner compositions of inclusions were correlated with nucleation temperature and peripheries of inclusions were comprised of CaS formed during the cooling process. Meanwhile, number of inclusions declined and mean diameters of inclusions increased after calcium treatment.

Key words: calcium treatment, low-carbon and aluminum-containing steel, w(Ca)/w(Al), inclusions

郭宝奇，包燕平，王敏，林路. 20Mn2钢钙处理过程钙铝比对夹杂物转变的影响[J]. 炼钢, 2015, 31(3): 36-40.

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