高钛焊丝用钢的钢液可浇性改善

邓叙燕,马建超,赵伟杰

钢铁 ›› 2015, Vol. 50 ›› Issue (2) : 32-37.

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钢铁 ›› 2015, Vol. 50 ›› Issue (2) : 32-37. DOI: 10.13228/j.boyuan.issn0449-749x.20140064
冶金工艺技术

高钛焊丝用钢的钢液可浇性改善

  • 邓叙燕1,2,马建超1,赵伟杰1
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Castability improvement of high Ti-bearing welding wire steel

  • 邓叙燕1,2,马建超1,赵伟杰1
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摘要

用扫描电镜(SEM/EDS)分析了高钛焊丝钢连铸水口结瘤物和钢液中夹杂物的形貌和组成,结果表明:结瘤物的主要组成是[TiOx]和凝钢;精炼结束后钢液中的夹杂物主要是[MnO-Al2O3-SiO2-TiOx]、[MgO-Al2O3-TiOx]和[TiOx]类夹杂物;钢液中大量的高熔点含钛夹杂物是导致水口结瘤的主要原因。对钢液中的Al-Ti-O平衡和钢渣间的平衡进行了热力学计算,结果表明:当[w([Al])/w([Ti])<0.15]时,氧优先与钛结合,反之优先与铝结合;当钢包渣中的[w((FeO))][<]0.05%、[w((SiO2))][<]15%时,可避免钛被炉渣氧化。通过对冶炼工艺参数和操作过程的优化,钢液中[TiOx]的质量分数从0.002 4%降低到0.001 0%以下,钢液的可浇性得到明显改善。

Abstract

Severe SEN (Submerged Entry Nozzle) clogging issue occurred in the continuous casting process of high Ti-bearing welding wire steel. The chemical composition of clogs was characterized using SEM/EDS. The results indicate that the major constituent phases are [TiOx] and solidified steel. The morphology and chemical composition of inclusions in liquid steel were analyzed by SEM/EDS. The results show the inclusion types at LF end are [MnO-Al2O3-SiO2-TiOx], [MgO-Al2O3-TiOx] and [TiOx]. The Ti-bearing inclusions with high melting point in liquid steel are the dominant reason to SEN clogging. Al-Ti-O equilibrium in liquid steel and steel-slag equilibrium were calculated by thermodynamic method. The results show oxygen is preferred to combine with Ti to form Ti2O3 when [w([Al])/w([Ti])<0.15], otherwise, oxygen is preferred to combine with Al; the titanium would not be oxidized by slag when [w((FeO))][<]0.05%, [w((SiO2))][<]15% in ladle slag. TiOx inclusion content in liquid steel is reduced from 0.002 4% to below 0.001% after the process parameters and operation are optimized; hence, the castability of liquid steel is improved significantly.

关键词

焊丝钢 / 水口结瘤 / 热力学计算 / 氧化钛

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邓叙燕. 高钛焊丝用钢的钢液可浇性改善[J]. 钢铁, 2015, 50(2): 32-37 https://doi.org/10.13228/j.boyuan.issn0449-749x.20140064
DENG Xu-Yan. Castability improvement of high Ti-bearing welding wire steel[J]. Iron and Steel, 2015, 50(2): 32-37 https://doi.org/10.13228/j.boyuan.issn0449-749x.20140064

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