Evolution behaviour of nonmetallic inclusions in Ti-bearing 11Cr stainless steel with calcium treatment

被引：18
作者：
Li, Jingyu [1 ]
Cheng, Guoguang [1 ]
Ruan, Qiang [2 ]
Pan, Jixiang [2 ]
Chen, Xingrun [2 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China
[2] Hongxing Iron & Steel Jiuquan Iron & Steel Co Ltd, Jiayuguan, Peoples R China
来源：
IRONMAKING & STEELMAKING | 2020年 / 47卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Stainless steel; titanium; aluminum; calcium treatment; secondary steelmaking; AL-TI; ALUMINUM DEOXIDATION; LIQUID-IRON; THERMODYNAMICS; TITANIUM; EQUILIBRIUM; REOXIDATION; SPINEL; NOZZLE; TI3O5;
D O I：
10.1080/03019233.2019.1568367
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Nonmetallic inclusions formed during the Ti-stabilized stainless steelmaking process can induce the clogging in the submerged entry nozzle during continuous casting. To investigate the formation mechanism of nonmetallic inclusions in Ti-stabilized stainless steel, steel specimens were taken at different stages in industrial trials. The characteristics of inclusions and the chemical compositions of steel were analysed. After 10 min of Al deoxidation, the main type of inclusions in samples was irregular MgO center dot Al2O3. With titanium addition after calcium treatment, the irregular dual phase CaO-TiOx-Al2O3-MgO inclusions were formed. The steel compositions of most samples were located in or close to the Al2O3-TiOx liquid oxide phase field. According to experiment and thermodynamic results, the solid CaTiO3 and/or CaO center dot 2Al(2)O(3) inclusions were formed during titanium addition when the molten steel contained more than 20 ppm calcium. The effect of the initial calcium content on the formation of Ca-Al-Ti-O inclusions during titanium addition was discussed.
引用
收藏
页码：31 / 39
页数：9
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