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针对首钢京唐钢铁联合有限公司生产IF钢时,RH精炼时间过长的生产问题,进行了工艺现状调研分析,认为脱碳前、后期脱碳速率过低是限制性环节。为此,对影响脱碳速率的主要工艺,即压降制度、循环气体流量、废钢加入量及RH进站碳含量控制进行了优化。结果表明:脱碳前期预抽真空可以消除脱碳平台,提高前期的脱碳效率。脱碳后期将循环气体流量从3 000 L/min增至3 666 L/min,可增大钢水循环流量,提高脱碳效果。废钢对终点碳含量影响较大,应对废钢的加入量严格控制且在脱碳后期加入。实施优化措施后,脱碳前期与脱碳后期表观脱碳速率常数分别从0.05,0.03 min-1提高至0.226,0.07 min-1,平均终点碳含量与脱碳时间分别从15.5×10-6和17.5 min下降到10.2×10-6和14.4 min。
According to the production of IF steel produced by Shougang Jingtang Iron & Steel United Co., Ltd., the production process of RH refining time is too long, the status quo of the process is investigated and analyzed, and the decarburization rate before and after decarburization is a limiting part. To this end, the main processes affecting the rate of decarburization, namely pressure drop system, circulating gas flow, scrap loading and RH pitching carbon content control were optimized. The results show that pre-evacuation can eliminate the decarburization platform and improve the pre-decarbonization efficiency. In the later stage of decarburization, the circulating gas flow rate will be increased from 3 000 L / min to 3 666 L / min, which will increase the circulating flow of molten steel and improve the decarbonization effect. Scrap has a great impact on the carbon content of the terminal, and the amount of scrap steel should be strictly controlled and added after the decarburization. After optimization, the apparent decarburization rate constant at the early decarburization and decarburization stages increased from 0.05,0.03 min-1 to 0.226,0.07 min-1, respectively, and the average carbon content and decarburization time from 15.5 × 10-6 And 17.5 min to 10.2 × 10-6 and 14.4 min.