低铝无取向硅钢结晶器液面波动及水口结瘤控制

炼钢 ›› 2022, Vol. 38 ›› Issue (6): 46-51.

低铝无取向硅钢结晶器液面波动及水口结瘤控制

周彦召¹，赵家七¹，马建超¹，詹侃²

1.江苏省（沙钢）钢铁研究院，江苏张家港 215625；
2.江苏沙钢集团有限公司转炉炼钢厂，江苏张家港 215625

出版日期:2022-12-05 发布日期:2022-12-02

Mold level fluctuation and nozzle clogging control of low aluminum non oriented silicon steel in casting process

Online:2022-12-05 Published:2022-12-02

摘要/Abstract

摘要： 通过能谱和物相分析对水口结瘤物和冶炼过程钢液夹杂物进行研究。结果表明W800低铝无取向硅钢结晶器液面波动幅度大主要是Al₂O₃类夹杂物在浸入式水口聚集造成的。从RH破空到钢液进入中间包的过程中，随着炉渣氧化性增加，Al₂O₃类夹杂物的密度逐渐增大。当炉渣w(CaO)/w(Al₂O₃)≤1.7时，随着w(CaO)/w(Al₂O₃)增加，FeO的活度逐渐降低，进而Al₂O₃类夹杂物的密度也逐渐减少。Al₂O₃类夹杂物的增加主要来自炉渣对钢液的二次氧化。塞棒吹氩流量小，夹杂物会在水口内壁聚集；吹氩流量过大，会引起结晶器液面波动幅度大，合适的塞棒氩气流量可以有效地控制结晶器液面波动幅度。通过炉渣成分控制和塞棒氩气流量调节，W800钢液的洁净度显著提高，中间包钢液的夹杂物数量密度从0.41个/mm²减少到0.35个/mm²，结晶器液面波动控制±1.5 mm内的比例明显提高，达标率稳定在90 %以上。

关键词: 无取向硅钢, 液面波动, 水口结瘤, 夹杂物

Abstract: The clogs in SEN and inclusions in steelmaking process were analyzed by electron microscope, energy spectrum and phase analysis equipment. The results show that the large fluctuation range of mold level in W800 low aluminum non oriented silicon steel casting process is mainly caused by the accumulation of Al₂O₃ inclusions in the submerged nozzle. From RH ending to tundish, with the increase of slag oxidizability, the number density of Al₂O₃ inclusions increases gradually. Meanwhile, when w(CaO)/w(Al₂O₃) is less than 1.7 in slag, with the increase of w(CaO)/w(Al₂O₃), the activity of FeO decreases, and the number density of Al₂O₃ inclusions also decreases gradually. The addition of Al₂O₃ inclusions mainly come from the secondary oxidation of molten steel by top slag. The argon blowing flow of the stopper is small, and the inclusions will gather at the nozzle. Excessive argon blowing flow will cause large fluctuation range of mold liquid level. Proper stopper argon flow can effectively control the fluctuation range of mold liquid level. Through slag composition control and stopper argon flow adjustment, the cleanliness of molten steel is significantly improved, the number density of inclusions in tundish molten steel is reduced from 0.41/mm²to 0.35/mm², the compliance rate of mold liquid level fluctuation within ±1.5 mm is significantly increased, and the compliance rate is stable at more than 90 %.

Key words: non-oriented silicon steel, liquid level fluctuation, clogging, inclusion

周彦召, 赵家七, 马建超, 詹侃. 低铝无取向硅钢结晶器液面波动及水口结瘤控制[J]. 炼钢, 2022, 38(6): 46-51.

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