210 t BOF-RH-板坯CC流程钢包顶渣改质处理对超低碳钢夹杂物的影响

特殊钢 ›› 2015, Vol. 36 ›› Issue (3): 38-42.

210 t BOF-RH-板坯CC流程钢包顶渣改质处理对超低碳钢夹杂物的影响

周业连，何奇，邓志银，周剑丰，朱苗勇

1东北大学材料与冶金学院，沈阳110819；
2湖南华菱涟源钢铁集团有限公司技术中心，娄底417009

收稿日期:2014-12-20 出版日期:2015-06-01 发布日期:2022-08-17
作者简介:周业连(1987-),男，博士生(东北大学),2010年安徽工业大学(本科)毕业，精炼过程夹杂物去除研究。

Effect of Ladle Top Slag Modification Treatment on Inclusions in Ultra-Low Carbon Steel in 210 t BOF-RH-Slab CC Flowsheet

Zhou Yelian¹ , He Qi¹ , Deng Zhiyin¹, Zhou Jianfeng² ，Zhu Miaoyong¹

1 School of Materials and Metallurgy, Northeastern University, Shenyang 110819 ；
2 Technology Center, Hunan Hualing Lianyuan Iron and Steel Group Co Ltd, Loudi 417009

Received:2014-12-20 Published:2015-06-01 Online:2022-08-17

摘要/Abstract

摘要： 检测分析了加改质剂（/%:38~43Al,20~30Al₂O₃,27~31CaO,≤6SiO₂,≤6MgO）改质210 t钢包顶渣前后超低碳钢（≤0.01%C）连铸坯中的夹杂物数量和尺寸分布,通过热力学分析,研究了改质剂对钢渣间氧平衡以及连铸坯中夹杂物的影响。结果表明,钢包顶渣改质前的精炼渣样成分为（/%）25.55~39.68CaO,8.51~15.14SiO₂,6.34~27.09MgO,5.92~6.54Al₂O₃,17.32~22.24FeO,3.86~7.35MnO,改质后渣样成分为（/%）34.36~40.43CaO,7.69~11.47SiO₂,6.42~7.31MgO,8.31~25.54Al₂O₃,11.94~20.78FeO,2.17~2.63MnO;采用钢包顶渣改质处理,实际渣中a_(FeO)小于与钢液中氧相平衡的a_(FeO),引起了钢液中的氧通过渣金界面向渣中扩散,从而降低了钢液中氧活度,显著改善钢液的洁净度和降低连铸坯中的夹杂物数量和尺寸,水口结瘤得到明显改善;同时,虽然渣中的a_(FeO)下降较小,但钢液中氧活度得到了明显降低。

关键词: 顶渣改质, 杂物, 超低碳钢, 氧活度, 水口堵塞

Abstract: The amount and distribution of inclusions in casting slab of ultra-low carbon steel ( ≤0. 01% C) processing in 210 t ladle with and without adding modifying agent (/% : 38 ~43Al, 20~30Al₂O₃, 27 ~ 31 CaO, ≤6SiO₂, ≤6MgO) to ladle top slag have been examined and analyzed, and the effect of modifying agent on oxygen equilibrium between steel and slag and inclusions in casting slab is studied by thermodynamic analysis. Results show that the ingredient of refining slag sample for ladle top slag without adding modifying agent is (/% ) 25. 55 ~ 39. 68CaO, 8. 51 ~15. 14SiO₂, 6. 34 ~ 27.09MgO, 5. 92 ~6. 54Al₂O₃, 17. 32 ~22, 24FeO, 3. 86 ~7. 35MnO, and ingredient of refining slag sample for ladle top slag with adding modifying agent is (/% ) 34.36 ~ 40. 43CaO, 7. 69 ~11.47SiO₂ , 6. 42 ~7. 31MgO, 8.31 ~ 25. 54Al₂O₃, 11.94 ~ 20. 78FeO, 2. 17 ~ 2. 63MnO； with using ladle top slag modification treatment, the actual activity coefficient a_(FeO) in slag is less than that in equilibrium with dissolved oxygen in steel led to oxygen diffusion from steel to slag through the interface of metal-slag, thus to lower the activity of oxygen in liquid, obviously improve the cleanliness of liquid and decrease the amount and size of inclusions in casting slab, and markedly reduce the nozzle clogging occurrence. Besides, although the decrease of a_(FeO) in slag is small, whereas the activity of oxygen in liquid decreases significantly.

周业连, 何奇, 邓志银, 周剑丰, 朱苗勇. 210 t BOF-RH-板坯CC流程钢包顶渣改质处理对超低碳钢夹杂物的影响[J]. 特殊钢, 2015, 36(3): 38-42.

Zhou Yelian , He Qi, Deng Zhiyin, Zhou Jianfeng, Zhu Miaoyong. Effect of Ladle Top Slag Modification Treatment on Inclusions in Ultra-Low Carbon Steel in 210 t BOF-RH-Slab CC Flowsheet[J]. Special Steel, 2015, 36(3): 38-42.

参考文献

[1]Suda M,Suitou M, Hasunuma J,et al. The Advanced Mass Production System of Ultra-low Carbon Steel at KSC's Mizushima Works [A]. Steelmaking Conference Proceedings, 1992,75 ：229-232.
[2]Bommaraju R,Trump D, Chaubal P, et al. Ladle Slag Treatment for Production of Ultra-low Carbon Steels [A]. 76th Steelmaking Conference ,1993 ：457-464.
[3]Tanaka H,Nishihara R, Miura R, et al. Technology for Cleaning of Molten Steel in Tundish[J]. ISIJ International, 1994,34(11) ：868- 875.
[4]李伟东，孙群，齐磊.超低碳钢顶渣改质技术研究[A].成都:第九届中国钢铁年会论文集[C]. 2007：1-4
[5]崔衡，陈斌，王敏，等.RH精炼过程中IF钢洁净度控制 [J].北京科技大学学报,2011,33(S1)：1-4.
[6]Shannon G N, Sridhar S. Modeling A1₂O₃ Inclusion Separation Across Steel-Slag Interfaces[J]. Scandinavian Journal of Metallurgy ,2005,34(6) ：353-362.
[7] Taira S, Nakashima K, Mori K. Kinetic Behavior of Dissolution of Sintered Alumina into CaO-SiO₂-Al₂O₃ Slags [J] . ISIJ Intemational,1993,33(1) ：116-123.
[8]Yu X, Pomfret R J, Coley K S. Dissolution of Alumina in Mold Fluxes [J]. Metallurgical and Materials Transactions B, 1997,28(2) ：275- 279.
[9]Choi J Y,Lee H G,Kim J S. Dissolution Rate of Al₂O₃ into Molten CaO-SiO₂-Al₂O₃ Slags [J]. ISIJ International, 2002,42 (8) ： 852-860.
[10]王军，林丹.浅析转炉终点控制对夹杂物的影响[J]・金属材料与冶金工程,2012,40(6) ：20-22.
[11]黄希祜-钢铁冶金原理(第3版)[M].北京:冶金工业出版社, 2002.
[12] Yang X, Shi C, Zhang, et al. A Thermodynamic Model for Prediction of Iron Oxide Activity in Some FeO-Containing Slag Systems [J]. Steel Research International,2012,83(3) ：244-258.
[13]高艳宏.含硼高炉钛渣粘性特征与结构的研究[D].重庆:重庆大学,2012.

[1]	倪卓文, 朱红春, 李花兵, 姜周华, 孙正鑫, 何志禹. H13模具钢电渣锭中夹杂物的类型以及分布规律分析[J]. 特殊钢, 2024, 45(6): 48-52.
[2]	陈军, 彭光健, 林丹, 黄振华. 150 mm×150 mm小方坯超低碳钢H1T生产实践[J]. 特殊钢, 2024, 45(6): 17-22.
[3]	王利, 刘成宝, 李浩秋, 王毅, 孙宗辉, 刘春伟, 杨超云, 付志豪. 稀土对20CrMnTi齿轮钢夹杂物和疲劳性能的影响[J]. 特殊钢, 2024, 45(6): 117-124.
[4]	谢康, 莫金强, 张威, 王丽君. 稀土Ce对441铁素体不锈钢碳氮化物析出的影响与控制[J]. 特殊钢, 2024, 45(6): 1-7.
[5]	郑安民, 樊轩宇, 黄增鑫, 毛旺旺, 于彦冲, 张金玲, 王社斌. 稀土Ce对20MnTiB冷镦钢中夹杂物演变的影响[J]. 特殊钢, 2024, 45(6): 37-47.
[6]	赵昊乾, 张育明, 马博, 巩延杰, 孟耀青. LF精炼结束后软吹时间对帘线钢LX82 A夹杂物控制的影响[J]. 特殊钢, 2024, 45(6): 53-56.
[7]	袁麟, 胡小强, 刘洋, 李殿中, 谢晶, 陈伟. 稀土精炼与电渣重熔3%Cr轧辊钢对比分析[J]. 特殊钢, 2024, 45(5): 1-7.
[8]	杨建华, 巨银军, 杨俊. 帘线钢XLX72 A中氧化物夹杂的演变解析与去除[J]. 特殊钢, 2024, 45(5): 66-71.
[9]	刘泳, 张雲飞, 赵英利, 赵楠, 赵峥嵘, 樊明强, 田志强. 改善模具钢洁净度与抛光性能的冶炼工艺实践[J]. 特殊钢, 2024, 45(5): 47-52.
[10]	杨曙磊, 王曦伟, 田强, 王田田, 杨树峰. GH4742合金真空自耗铸锭中夹杂物分布特征[J]. 特殊钢, 2024, 45(4): 61-67.
[11]	孙中豪, 李强, 张明亮, 马程款, 夏志斌, 钟云波. 磁控电渣重熔对M2高速钢凝固组织及力学性能的影响[J]. 特殊钢, 2024, 45(4): 68-76.
[12]	赵朋, 桂凯璇, 曲敬龙, 杨树峰. ϕ690 mm大尺寸GH4738合金真空自耗重熔数值模拟与工业实验[J]. 特殊钢, 2024, 45(4): 55-60.
[13]	任吉, 燕云, 田家龙, 王礼超, 蒋成钢, 王琳, 姜周华. La处理对H13热作模具钢中夹杂物的影响[J]. 特殊钢, 2024, 45(4): 117-123.
[14]	高小勇, 张立峰. 三七渣电渣重熔对M50高温轴承钢中夹杂物的影响[J]. 特殊钢, 2024, 45(4): 89-93.
[15]	董立阳, 游小刚, 董庚益, 王轶农, 谭毅. 电子束精炼FGH4096合金夹杂物冶金机制[J]. 特殊钢, 2024, 45(4): 47-54.