Abstract: The production efficiency and cost for stainless steel steelmaking by HM DEP-KOBMS-VOD three-step process ( hot metal desiliconizing and dephosphorizing pretreatment-KOBMS converter decarburizing and alloying-vacuum oxygen decarburization) and EAF/BOF-AOD two-step process (300 series stainless steel parent melt steelmaking in arc furnace/dephosphorizing in converter for 400 series stainless steel-argon oxygen decarburizing and alloying) are analyzed. The three-step process has advantage to produce chromium steel and ultra-low carbon and nitrogen stainless steel including high productivity, low argon consumption and low P, Cu and Pb deleterious elements, while the (EAF-AOD) two-step process is favourable to produce 304, 316L etc chromium and nickel stainless steels, it is available to using pig iron bearing nickel and stainless steel scrap, and has low production cost and high efficiency. The grades and production practice for stainless steels melting by three-step and two-step process at Taigang are presented in this paper.

Key words: Two-Step Process, Three-Step Process, Stainless Steel Steelmaking, Analysis of Process, Production Practice

摘要： 分析了HM DEP-KOBMS-VOD三步法(铁水脱硅和脱磷预处理-KOBMS转炉脱碳、合金化-真空吹氧脱碳)和EAF/BOF-AOD二步法(电弧炉炼300系不锈钢母液/400系钢转炉脱磷-氩氧脱碳和合金化)生产不锈钢的生产效率和成本。三步法工艺生产铬不锈钢和超低碳氮不锈钢具有生产效率高、氩气消耗低、P-Cu-Pb有害杂质含量低的优势,而EAF-AOD二步法工艺生产304、316L等铬镍不锈钢有可使用含镍生铁、不锈钢废钢、生产成本低,效率高的优势。文中介绍了太钢用三步法和二步法工艺生产的不锈钢品种结构和工艺实践。

关键词: 二步法, 三步法, 不锈钢冶炼, 工艺分析, 生产实践