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浇注含Ti超低碳钢时,浸入式水口内产生结瘤,严重影响生产效率,同时对产品质量造成危害。根据企业生产的经验,随着超低碳钢中Ti和P含量的增加,水口结瘤的问题越来越严重。通过深入分析实际生产过程的试样和实验室研究,阐明浇注超低碳钢时Ti和P对水口结瘤的影响。分析了含Ti含P的超低碳钢水口结瘤物的成分,结果表明结瘤物的主要成分是氧化铝(>90%),Ti含量较少(0.58%～3.58%)。采用脉冲分布解析原子发射光谱法(OES-PDA)测得氧化夹杂物的大小随Ti含量的增加而变小。采用液滴法测定了溶质Ti和P对钢液/Al2O3体系的润湿性影响,结果表明Ti和P使体系接触角和钢液表面张力降低,其中Ti能够降低体系的接触角只是在其具有反应湿润性的情况下。研究表明Ti和P对产生结瘤的作用有显著区别:只要形成的表层界面具有润湿性,Ti就可以降低Al2O3夹杂物的大小,而氧化铝夹杂物颗粒越小,越容易结瘤。为了不产生结瘤就必须控制好Al脱氧的时间和Ti的加入时间。P可以增加Fe-Ti-P三元体系的润湿性是因为P可以增加Ti的活度,降低钢液的粘度。与Ti相比,P对产生结瘤的影响较小。
Cast Ti-containing ultra-low carbon steel, submerged nozzle produces nodules, seriously affecting the production efficiency, while the product quality hazards. According to the experience of production, with the increase of Ti and P content in ultra-low carbon steel, the problem of nozzle nodulation becomes more and more serious. Through in-depth analysis of the actual production process of the sample and laboratory studies to clarify the casting of ultra-low carbon steel Ti and P on the nozzle nodules. The composition of Ti-bearing P-containing ultra-low carbon steel nodules was analyzed. The results show that the main components of nodule are alumina (> 90%) and Ti content is less (0.58% ~ 3.58%). The size of the oxidized inclusions decreases with the increase of Ti content measured by pulse distribution analysis atomic emission spectrometry (OES-PDA). The droplet method was used to determine the effect of solute Ti and P on the wettability of the molten steel / Al2O3 system. The results show that Ti and P make the system contact angle and the liquid surface tension decrease, Ti can reduce the contact angle of the system, In the case of reactive wetting. The results show that there are significant differences between Ti and P on the formation of nodules: Ti can reduce the size of Al2O3 inclusions as long as the surface interface is wetted, while the smaller the alumina inclusions, the easier it is to nodulate. In order not to produce nodulation must control the Al deoxidation time and Ti addition time. P can increase the wettability of Fe-Ti-P ternary system because P can increase the activity of Ti and reduce the viscosity of molten steel. Compared with Ti, P has less effect on nodulation.