多位一体不锈钢冶炼在太钢的生产与实践

通过分析太钢不锈钢原料铬镍生铁、高碳铬铁、铁水等的特性以及研究了原料中Si、C元素优化使用,采用中频炉、电弧炉、转炉、AOD等工序进行多种组合,开发了300系、400系钢种多条不同组合的不锈钢工艺路线,形成了多位一体不锈钢生产工艺。生产实践表明,400系不锈钢采用180 t转炉脱磷铁水+50 t中频炉熔化高碳铬铁预熔液兑入AOD冶炼的工艺,铬收得率提高2.47%,硅铁消耗降低5.5 kg/t,石灰消耗降低10 kg/t,300系不锈钢采用160 t电弧炉+2×50 t中频炉熔化预熔液兑入AOD冶炼工艺,铬收得率提高2.2%,电极消耗降低1.8 kg/t,大幅降低了冶炼成本。

Production and Practice of Multi-in-One Process for Stainless Steel Smelting at TISCO

By means of analyzing the characteristics of TISCO stainless steel raw materials such as chromium-nickel crude iron, high-carbon ferrochrome and molten iron, studying the optimal use of Si and C elements in the raw materials, and using of various combinations of intermediate frequency furnace, electric arc furnace, converter, AOD and other processes, the several different combinations of stainless steel process routes for 300 series and 400 series stainless steel has been developed ,and a multi-in-one process stainless steel production process is formed. Production practice shows that as 400 series stainless steel is smelted by mixing molten iron dephosphorized by 180 t converter and pre-melted of high carbon ferrochrome by 50 t medium frequency furnace charging to AOD process,the chromium yield increases by 2.47% ,ferrosilicon consumption reduces by 5.5 kg/t,and lime consumption reduces by 10 kg/t,as 300 series stainless steel is produced by mixing the pre-melt melted by 160 t electric arc furnace + 2 x 50 t intermediate frequency furnace charging to AOD process,chromium yield increases by 2. 2% ,electrode consumption is reduced by 1.8Kg/t,and smelting cost is greatly reduction.