Abstract: During refining process of steel 1Cr13 etc 400 series stainless steels in a 60 t AOD unit with direct charging hot metal, due to adding large amount of materials including ferrochromium alloy, slag-forming addition and return scrap, the required heat accounts for 15% 〜40% of the total heat of bath, that seriously restricts smooth refining and improving liquid quality. The effect of 60 t AOD lance level (1.5 ~ 3. 5 m) on CO post-combustion ratio, the effect of silicon content (1 % ~6. 5%) in ferrochrome on lime consumption and comprehensive supply of heat and the effect o£ baking time (0. 5 ~ 4. 5 h) on alloy temperature are studied by commercial production practice. Results show that with controlling 60 t AOD oxygen lance level at 3 m the CO post-combustion ratio increases to 20% ； with 4% silicon content in ferrochrome the comprehensive work efficiency is maximum ； and the time of alloy baking for 2 ~ 3 h is optimum.

摘要： 在铁水直兑60 t AOD精炼1Cr13钢等400系不锈钢工艺过程中,由于加入大量的铬铁合金、渣料、返回废钢等材料,所需热量占熔池的15%~40%,严重制约着生产顺行和质量改善。通过工业实践研究了60 t AOD枪位（1.5~3.5 m）对CO二次燃烧比的影响,铬铁中硅含量（1%~6.5%）对石灰消耗和综合提供热量的影响,以及烘烤时间（0.5~4.5 h）对合金温度的影响。结果表明,60 t AOD氧枪枪位控制在3 m时CO二次燃烧的比例可提高至20%;铬铁中硅含量为4%时综合功效最大;合金最佳烘烤时间为2~3 h。

关键词: 60 t AOD, 热补偿, 二次燃烧, 合金烘烤, 工艺实践