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为控制BH钢精炼结束到中间包过程的增碳量,分析了钢包内衬、中间包覆盖剂、中间包内衬等因素对BH钢钢液增碳的影响。通过分析表明,钢液的增碳量随着钢包砖衬碳质量分数的降低而下降,将包壁和包底的碳质量分数控制在0.5%以下,渣线部位的碳质量分数低于5%可以大幅度减少钢包耐材向超低碳钢液增碳效果,钢包的增碳量随着包龄的增加而降低。建立钢水覆盖剂的传热模型,将覆盖剂成分控制在高碱度低熔点区域(w_(SiO_2)≤5%,w_(CaOAl_2O_3)/w(Al_2_O3=1~1.5),wCaF_2=5%)来增大熔融层的厚度从而减小富碳层与钢液接触的概率。通过应用无碳长水口和中包工作层使用涂抹料,精炼结束到中包增碳量平均减少1.4×10~(-6)~1.5×10~(-6),增碳不超过3×10~(-6)比例由36%~44%提升至60%以上。
In order to control the amount of carbon added from the end of BH steel refining to the tundish, the effects of ladle lining, tundish covering agent and tundish lining on carbonation of BH steel were analyzed. The analysis shows that the amount of carbon in the molten steel decreases with the decrease of the mass fraction of the lining carbon in the ladle, the carbon content of the wall and the bottom of the ladle is controlled below 0.5%, the carbon mass fraction in the slag line is below 5% Can significantly reduce the ladle refractory material to the ultra-low carbon steel carbon effect, the amount of ladle carbon increase with the package age decreases. The heat transfer model of molten steel covering agent was established. The composition of the coating agent was controlled in the region of high basicity and low melting point (w SiO 2 ≤5%, w CaOAl 2 O 3 / w (Al 2 O 3 = 1 ~ 1.5) and wCaF 2 = 5% Increasing the thickness of the molten layer reduces the probability of contact between the carbon-rich layer and the molten steel. By using the non-carbon long nozzle and the working layer of the middle package, the amount of carbon added by the end of the refining is reduced by 1.4 × 10 -6 -6.5 × 10 -6 on average, and the carbon content does not exceed 3 × 10 ~ (-6) ratio increased from 36% to 44% to over 60%.