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利用扫描电镜对含钛焊丝钢中夹杂物性质及连铸水口结瘤物的物相组成进行了分析,并结合热力学计算研究了水口结瘤的形成机制。结果表明,LF精炼出站钢液中存在大量Al2O3、TiO2夹杂物,并不断附着沉积在水口内壁形成氧化铝型、氧化钛型或两者结合的结瘤物,连浇炉数仅为4次。通过优化钢中[Al]-[Ti]-[O]关系,控制铝质量分数在钛-铝竞争氧化平衡线之上,即w([Ti])/w([Al])4/3>84.49且w([Ti])/w([Al])>7.46,当钢液中w([Al])<0.006 8%时,能够降低Al2O3夹杂比例,有效减轻水口结瘤,连浇炉数提升至6炉次。
Using scanning electron microscopy (SEM), the properties of inclusions in the wire containing titanium and the phase composition of the continuous casting nozzles were analyzed. The formation mechanism of the nodules in the nozzle was studied by thermodynamic calculation. The results show that there are a large amount of Al2O3 and TiO2 inclusions in the molten steel at the LF refining station, and are continuously attached and deposited on the inner wall of the nozzle to form nodularized materials of alumina type, titania type or a combination of the two, . By controlling the [Al] - [Ti] - [O] relations in the steel, the aluminum mass fraction is controlled above the titanium-aluminum competing oxidation equilibrium line, w ([Ti]) / w ([Al]) 4/3> 84.49 and w ([Ti]) / w ([Al])> 7.46. When w ([Al]) is less than 0.006 8% in the molten steel, the inclusion ratio of Al2O3 can be reduced effectively, Upgrade to 6 heats.