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Al--Ca复合合金钢水脱氧机理的研究
引用本文:王晓英,仇圣桃,邹宗树,干勇.Al--Ca复合合金钢水脱氧机理的研究[J].北京科技大学学报,2017,39(5).
作者姓名:王晓英  仇圣桃  邹宗树  干勇
作者单位:1. 东北大学冶金学院, 沈阳110819;钢铁研究总院连铸技术国家工程研究中心, 北京100081;2. 钢铁研究总院连铸技术国家工程研究中心,北京,100081;3. 东北大学冶金学院,沈阳,110819
摘    要:通过Al-Ca复合合金钢水脱氧的平衡热力学计算,确定了钢液的氧的质量分数在3×10-6~1×10-4条件下,1600℃时的Al-Ca复合合金脱氧产物的稳定区域图.以此为基础,假定钙的收得率为100%,预测了钢液在Al-Ca复合合金Ca/Al质量比为5,加入量为M kg;Al-Ca复合合金Ca/Al质量比为0.2,加入量为M kg;Al-Ca复合合金Ca/Al质量比为0.2,加入量为0.2M kg三种不同脱氧制度下夹杂物的演变历程.结果表明,在Ca/Al=5,复合合金加入量使初始钢液中的Ca]为0.01%,Al]为0.002%时,夹杂物在钢液精炼过程中的演变历程为:12CaO·7Al2O3(l)/CaO·Al2O3(l)→CaO(s)→12CaO·7Al2O3(l)/CaO·Al2O3(l)→CaO(s)→12CaO·7Al2O3(l)/CaO·Al2O3(l),并确定了固态和液态脱氧产物在脱氧过程中交替形成为最理想的Al-Ca复合合金脱氧制度,可为钢铁企业脱氧剂的选择和应用提供参考和借鉴.

关 键 词:铝钙钢水脱氧合金  夹杂物  演变机理  热力学计算  铝酸钙

Study on steel deoxidation with Al-Ca compound alloy
WANG Xiao-ying,QIU Sheng-tao,ZOU Zong-shu,GAN Yong.Study on steel deoxidation with Al-Ca compound alloy[J].Journal of University of Science and Technology Beijing,2017,39(5).
Authors:WANG Xiao-ying  QIU Sheng-tao  ZOU Zong-shu  GAN Yong
Abstract:The thermodynamic diagram of calcium-aluminum-oxygen ternary system was determined through thermodynamic equi-librium calculation of liquid steel deoxidation. Based on this thermodynamic diagram and assuming 100% yield of Ca addition, the evolution mechanisms of inclusions with three different deoxidation schemes were predicted, including M kg addition of mCa/mAl =5 al-loy, M kg addition of mCa/mAl =0. 2 alloy and 0. 2M kg addition of mCa/mAl =0. 2 alloy. The calculated results show that the evolution history of inclusion is affected by both the addition quantity and Ca/Al mass ratio of Al-Ca deoxidizer. The optimal deoxidation scheme is that the Ca/Al mass ratio is 5 and addition quantity is M kg, which makes the initial Ca] content of 0. 01% and initial Al] content of 0. 002% in liquid steel. Under such a condition, the evolution history of inclusions is 12CaO·7Al2O3(l)/CaO·Al2O3(l)→CaO(s)→12CaO·7Al2O3(l)/CaO·Al2O3(l)→CaO(s)→12CaO·7Al2O3(l)/CaO·Al2O3(l), and the desirable alternative forma-tions of solid and liquid inclusions can be realized during LF refining, which can greatly enhance the effective collision and promote the floating up of inclusions. The results can be applied in industry for steel deoxidizer selection and deoxidation operation.
Keywords:aluminum-calcium steel deoxidizer  inclusions  evolution mechanism  thermodynamic calculation  calcium alumi-nate
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