北京科技大学学报
北京科技大學學報
북경과기대학학보
JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
2014年
12期
1615-1625
,共11页
炼钢%氧化铝%夹杂物改性%钙处理%中间产物分析%热力学计算
煉鋼%氧化鋁%夾雜物改性%鈣處理%中間產物分析%熱力學計算
련강%양화려%협잡물개성%개처리%중간산물분석%열역학계산
steelmaking%alumina%inclusion modification%calcium treatment%intermediate product analysis%thermodynamic calculations
通过观测钙处理前后夹杂物形貌和成分的变化,对钙处理效果、中间产物的形成及不同中间产物对氧化铝夹杂的改性路径进行了研究.结果表明,钙处理可将钢液中不规则固态夹杂改性为球形液态夹杂,并且各炉次夹杂物的改性程度不同.热力学分析表明,Als和S含量越高,氧化铝夹杂改性为液态的难度越大.钙处理后的短时间内,CaS和CaO作为中间产物存在.通过建立中间产物生成的动力学模型,确定了生成不同中间产物的临界硫质量分数为11.1×10-6(钢液中溶解氧质量分数为4×10-6).由该模型结合结果分析,推断出不同中间产物对氧化铝的改性路径.
通過觀測鈣處理前後夾雜物形貌和成分的變化,對鈣處理效果、中間產物的形成及不同中間產物對氧化鋁夾雜的改性路徑進行瞭研究.結果錶明,鈣處理可將鋼液中不規則固態夾雜改性為毬形液態夾雜,併且各爐次夾雜物的改性程度不同.熱力學分析錶明,Als和S含量越高,氧化鋁夾雜改性為液態的難度越大.鈣處理後的短時間內,CaS和CaO作為中間產物存在.通過建立中間產物生成的動力學模型,確定瞭生成不同中間產物的臨界硫質量分數為11.1×10-6(鋼液中溶解氧質量分數為4×10-6).由該模型結閤結果分析,推斷齣不同中間產物對氧化鋁的改性路徑.
통과관측개처리전후협잡물형모화성분적변화,대개처리효과、중간산물적형성급불동중간산물대양화려협잡적개성로경진행료연구.결과표명,개처리가장강액중불규칙고태협잡개성위구형액태협잡,병차각로차협잡물적개성정도불동.열역학분석표명,Als화S함량월고,양화려협잡개성위액태적난도월대.개처리후적단시간내,CaS화CaO작위중간산물존재.통과건립중간산물생성적동역학모형,학정료생성불동중간산물적림계류질량분수위11.1×10-6(강액중용해양질량분수위4×10-6).유해모형결합결과분석,추단출불동중간산물대양화려적개성로경.
The calcium treatment effect, the intermediate product formation and the modification routes of alumina inclusions by different intermediate products after calcium treatment were investigated by observing the shape and composition of these inclusions. It is found that blocky or rectangular solid inclusions finally change into spherical liquid inclusions, but their modification degrees are different. According to thermodynamic analysis, the higher the Als and S concentration in molten steel, the more difficult the modifica-tion of alumina inclusions is. CaS and CaO exist as intermediate products in a short time after calcium treatment. A kinetic model of intermediate product formation shows that the critical [ S] mass fraction of the formation of different intermediate products is 11. 1 × 10 -6 with 4 × 10 -6 of dissolved oxygen. The modification routes of alumina inclusions by different intermediate products can be derived from the above model and experimental results.