Behavior of Inclusions in 0.88% Si Non-Oriented Silicon Steel Steelmaking by Process of 100 t Combined Blowing Converter-RH-70 mm Slab Flowsheet

Special Steel ›› 2015, Vol. 36 ›› Issue (2): 1-4.

Behavior of Inclusions in 0.88% Si Non-Oriented Silicon Steel Steelmaking by Process of 100 t Combined Blowing Converter-RH-70 mm Slab Flowsheet

Qiao Zhi^1,2 , Qin Zhe² , Liao Jianjun^2,3 , Shi Zhe¹ , Qiu Shengtao²

1. School of Metallurgy and Energy Resources, Kunming University of Science and Technology, Kunming 650093 ；
2. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081 ；
3. Second Steelmaking Works, Xinyu Iron & Steel Co Ltd, Xinyu 338001;

Received:2014-10-10 Online:2015-04-01 Published:2022-08-20

100 t复吹转炉-RH-70 mm板坯连铸流程0. 88% Si无取向硅钢的夹杂物行为

乔智^1,2，秦哲²，廖建军^2,3，施哲¹，仇圣桃²

1. 昆明理工大学冶金与能源工程学院，昆明 650093；
2. 钢铁研究总院连铸技术国家工程研究中心，北京 100081 ；
3. 新余钢铁股份有限公司第二炼钢厂，新余 338001;

作者简介:乔智(1987-),男，硕士研究生(昆明理工大学)，西安建筑科技大学(本科)毕业，钢水洁净度研究。

Abstract

Abstract: The production process of 0. 88% Si non-oriented silicon steel is adding 300 kg lime in tapping of 100 t BOF, controlling end [C] 0.035%-0.05% and tapping liquid temperature 1640-1650 °C , RH blowing oxygen to decarburize ,adding 99.0% Al-Fe alloy 6.69 kg/t and adding 70%Si-Fe alloy 15.70 kg/t in RH refining process, in whole process shield-atmosphere casting 70 mm slab, and using magnesia basic tundish shielding agent. Analysis results show that RH end [O] is 28 x 10^-6, slab [O] is 22 x 10^-6 , RH beginning [N] is 16 x 10^-6, nitrogen content in liquid increases by 4 x 10^-6 during RH process and the nitrogen content in steel increases by 6 x 10^-6 during end RH to slab casting process ； at end RH decarburization the main inclusions in steel are spherical MnO·Al₂O₃, after RH Refining the main inclusions in steel are irregular Al₂O₃ accompanied by a small amount CaS inclusions ； the main inclusions in liquid of tundish are irregular Al₂O₃ ； in casting slab the most inclusions are irregular Al₂O₃ with a small amount of AIN and minor composite inclusions containing Na caused by slag enclosure in mold.

Key words: 100 t Top and Bottom Combined Blowing Converter-RH-70 mm Slab Flowsheet, 0. 88% Si Non-Oriented Silicon Steel, T[O], [N], Behavior of Inclusions in Steel

摘要： 0.88%Si无取向硅钢的生产工艺为100 t BOF出钢时加300kg石灰,终点[C]0.035%~0.05%,出钢温度1640~1650℃,RH吹氧脱碳,加99.0%Al-Fe合金6.69 kg/t,加70%Si-Fe合金15.70 kg/t,70 mm板坯连铸过程全程保护浇铸,使用镁质碱性中间包覆盖剂。分析结果表明,RH终点[O]28×10^-6,铸坯[O]22×10^-6,RH-前[N]为16×10^-6,RH过程增氮4×10^-6,RH结束到铸坯增氮6×10^-6;RH脱碳终点时钢中夹杂物以球形MnO·Al₂O₃为主;RH出站时以不规则形状的Al₂O₃为主,并伴有少量单独存在的CaS夹杂;中间包钢液内的夹杂物主要以不规则形状的Al₂O₃为主;铸坯中多为不规则形状的Al₂O₃以及少量AlN,还有少量由结晶器卷渣引起的含Na成分的复合夹杂物。

关键词: 100t顶底复吹转炉-RH-70mm板坯连铸流程, 0.88% Si无取向硅钢, T[O], [N], 夹杂物行为

Qiao Zhi , Qin Zhe , Liao Jianjun , Shi Zhe , Qiu Shengtao. Behavior of Inclusions in 0.88% Si Non-Oriented Silicon Steel Steelmaking by Process of 100 t Combined Blowing Converter-RH-70 mm Slab Flowsheet[J]. Special Steel, 2015, 36(2): 1-4.

乔智, 秦哲, 廖建军, 施哲, 仇圣桃. 100 t复吹转炉-RH-70 mm板坯连铸流程0. 88% Si无取向硅钢的夹杂物行为[J]. 特殊钢, 2015, 36(2): 1-4.

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