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利用工业试验,研究了常规RH和RH-TOP精炼处理IF钢的脱碳过程、钢水氧含量、真空室压力、废气流量及成分、钢水温降的变化。根据表观脱碳速率常数的不同,两种精炼方式下脱碳过程分别呈现“两段式”和“三段式”变化规律,均可以在20 min内稳定生产碳质量分数低于15×10-6的IF钢;吹氧使得真空室压降平台处压力升高,平台时间延长,不利于提高脱碳速率,且吹氧过量导致脱碳终点氧含量大幅升高。采用RH-TOP吹氧时,CO的二次燃烧产生的热补偿可以降低转炉出钢温度20~30℃。
The industrial tests were conducted to study the decarburization process, the oxygen content in molten steel, the pressure in vacuum chamber, the flow rate and composition of exhaust gas and the temperature drop of molten steel in conventional RH and RH-TOP refining IF steel. According to the different apparent decarburization rate constants, the decarburization process under the two refining modes showed “three-stage” and “two-stage” and “three-stage” In the IF steel of 15 × 10-6, oxygen pressure increased the pressure at the pressure drop platform in the vacuum chamber and prolonged the platform time, which was unfavorable to increase the decarburization rate, and the excessive oxygen blowing resulted in a sharp increase in the oxygen content at the end point of decarburization. When RH-TOP is used to blow oxygen, the thermal compensation produced by the secondary combustion of CO can reduce the tapping temperature of the converter by 20-30 ° C.