Influence of Calcium Addition on Inclusions in LCAK Steel with Ultralow Sulfur Content

被引：53
作者：
Yang, Guangwei [1 ]
Wang, Xinhua [1 ]
Huang, Fuxiang [1 ]
Yang, Die [1 ]
Wei, Pengyuan [1 ]
Hao, Xin [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2015年 / 46卷 / 01期
基金：
中国国家自然科学基金;
关键词：
LIQUID-IRON; NONMETALLIC INCLUSIONS; EQUILIBRIUM; DEOXIDATION; ALUMINUM;
D O I：
10.1007/s11663-014-0181-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Experiments with different calcium addition were carried out in a MgO crucible without slag at 1873 K (1600 degrees C) to investigate the variation of inclusion composition in low carbon Al-killed (LCAK) steel with ultralow sulfur content (0.028 to 0.0738 pct Al, 7 to 9 ppm S). It was found that total oxygen (T. O) content in steel decreases whereas [mass pct Ca]/[mass pct T. O] and [mass pct Mg]/[mass pct T. O] increase with CaSi addition. Inclusions change from spherical CaO-Al2O3(-CaS-MgO) to irregular CaO-CaS with CaSi addition. The Al2O3 content in inclusions linearly decreases by increasing [mass pct Ca]/[mass pct T. O] of the steel and it disappears when [mass pct Ca]/[mass pct T. O] exceeds 3. In addition, (mass pct CaS)/(mass pct CaO) of the inclusions linearly increases by increasing [mass pct S]/[mass pct T. O] of the steel. The steel composition for CaO-CaS formation is obtained. The mechanism of inclusion evolution is discussed.
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页码：145 / 154
页数：10
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