150 t LF精炼喂钙线处理钢中夹杂物的演变

特殊钢 ›› 2016, Vol. 37 ›› Issue (3): 8-12.

150 t LF精炼喂钙线处理钢中夹杂物的演变

姜玉龙^1,2,郑万^1,2,齐盼盼^1,2,李天佑^1,2,王春锋³,刘炳宇³,李光强^1,2

武汉科技大学1省部共建耐火材料与冶金国家重点实验室;
2钢铁冶金及资源利用省部共建教育部,重点实验室，武汉430081 ；
3武汉钢铁股份有限公司,武汉430083

收稿日期:2015-12-30 出版日期:2016-06-01 发布日期:2022-08-02
作者简介:姜玉龙(1990-),男，硕士研究生,2013年武汉科技大学(本科)毕业，氧化物冶金与钙处理工艺研究。
基金资助:
国家自然科学基金资助(No. 51541409)

Evolution of Inclusions in Steel with 150 t LF Refining Feeding Calcium Wire Treatment

Jiang Yulong^1,2, Zheng Wan^1,2 ,Qi Panpan^1,2 ,Li Tianyou^1,2, Wang Chunfeng³ ,Liu Bingyu³,Li Guangqiang^1,2

1 State Key Lab of Refractories & Metallurgy;
2 Key Lab for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology, Wuhan 430081 ；
3 Wuhan Iron and Steel Co Ltd, Wuhan 430083

Received:2015-12-30 Published:2016-06-01 Online:2022-08-02

摘要/Abstract

摘要： 通过热力学计算和扫描电镜研究了铁水预处理-150 t BOF-钢包吹氩-LF-CSP流程LF精炼后喂硅钙线和钙铝线处理的Q235,SPA-H和DC01钢中夹杂物演变及精炼渣对其影响。结果表明,Ca处理前的精炼过程中,钢中Al₂O₃大部分已经被精炼渣（/%:52.97~55.63CaO,4.11~12.78SiO₂,5.11~9.87MgO,22.93~31.72Al₂O₃,0.58~1.27FeO,0.01~0.07MnO）改性为MgO·Al₂O₃,根据Mg-Al-O生成优势区图,钢中有微量Mg就能使Al₂O₃变性为MgO·Al₂O₃尖晶石,钙处理主要是对MgO·Al₂O₃尖晶石的变性,因此需要保证充足的钙线喂入量,才能将高熔点铝镁和铝镁钙复合夹杂物变性到低熔点区域;为了避免生成高熔点CaS夹杂物,钙处理前[Al]=0.02%~0.04%时,[S]要小于0.001 4%。

关键词: 钙处理, Q235,DC01,SPA-H钢, 夹杂物, CSP, 水口堵塞, 精炼渣

Abstract: The evolution of inclusions in steel Q235, SPA-H and DC01 treated by feeding silicon-calcium wire and calcium-aluminium wire after LF refining in metal pretreatment-150 t BOF-ladle argon blowing-LF-CSP flowsheet and the effect of refining slag on inclusions are studied by thermodynamic calculation and scanning electron microscope. The results show that during refining process before Ca treatment the greater part of Al₂O₃ in steel is modified to MgO·Al₂O₃ by refining slag (/%： 52.97 ~55.63CaO, 4.11 ~12.78SiO2, 5.11~9.87MgO, 22.93 ~31.72Al₂O₃, 0. 58 ~1.27FeO, 0. 01 ~0. 07MnO) ; based on the Mg-Al-O predominant forming diagram, with micro-amount Mg in steel the Al₂O₃ may modify to MgO· Al₂O₃ spinel, the calcium treatment is mainly to modify the MgO· Al₂O₃ spinel, therefore it is need to feeding sufficient amount of calcium for high melting point aluminium-magnesium and aluminium-magnesium-calcium inclusion modifying to low melting point region; in order to avoid forming high melting point CaS inclusions, before calcium treatment with [Al] =0. 02% ~0. 04% the [S] should be less than 0.001 4%.

姜玉龙, 郑万, 齐盼盼, 李天佑, 王春锋, 刘炳宇, 李光强. 150 t LF精炼喂钙线处理钢中夹杂物的演变[J]. 特殊钢, 2016, 37(3): 8-12.

Jiang Yulong, Zheng Wan , Qi Panpan , Li Tianyou, Wang Chunfeng , Liu Bingyu, Li Guangqiang. Evolution of Inclusions in Steel with 150 t LF Refining Feeding Calcium Wire Treatment[J]. Special Steel, 2016, 37(3): 8-12.

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