RH生产超低碳钢的脱碳速率及工艺优化

 通过RH超低碳钢脱碳工业试验，对RH精炼过程工艺参数进行全程跟踪。重点对表观脱碳速率常数Kc进行了测定和评价。结果表明，RH脱碳过程分为3个阶段：抽真空阶段、吹氧脱碳阶段和自然脱碳阶段。稳定生产碳含量小于0.002%(质量分数，下同)的超低碳钢的优化工艺参数为：进站碳含量0.05%~0.06%，氧含量0.04%~0.06%；吹氧期的起始真空度12~15kPa，吹氩强度0.015m3·t-1·min-1；自然脱碳时间大于15min，吹氩强度0.015m3·t-1·min-1，终脱氧前的氧含量＜0.035%。

Decarburization Rate and Process Optimization of RH for Ultra-Low Carbon Steel

The process parameters during RH refining were tracked by decarburization industrial experiments of ultra low carbon steel. The apparent rate constant for decarburization, Kc, was measured and evaluated. The decarburization process can be divided 3 stages: vacuum-pumping stage, blowing oxygen decarburization stage, natural decarburization stage. The optimized process parameters to produce ultra low carbon steel with carbon content less than 0.002% are determined: the initial w［C］ content is 0.05%-0.06%, w［O］ content is 0.04%-0.06%; the vacuum degree is 12-15kPa to start blowing oxygen, and intensity of argon blowing is 0.012m3·t-1·min-1 at the oxygen-blowing stage; more than 15 min for natural decarburization, intensity of argon blowing is 0.015m3·t-1·min-1 and w［O］ before final deoxidation is below 0.035%.