60t AOD精炼使用炉料级铬铁冶炼400系不锈钢的生产实践

Production Practice of 60t AOD Using Charge Material Ferrochrome to Refining 400 Series Stainless Steel

成分相同的粒度为10~400mm炉料级铬铁比粒度10~60 mm高碳铬铁价格低,但是粒度较大不能通过高仓加料的形式加入AOD内完成合金化。通过分析60 t AOD精炼不锈钢脱碳模型和工业生产实践,采用将炉料级铬铁装在废钢斗内加料的方式,沿用兑铁后加料的操作模型,控制加料前熔池的温度在1 550~1 600℃,炉料级铬铁替换高碳铬铁加入量在200 kg/t,供氧强度在2.0~2.5 m^3/(t·min)能够实现炉料级铬铁一次性加入后操作的稳定和降低成本。

The price of size 10 - 400 mm charge material ferrochrome is lower than that of size 10 - 60 mm high car- bon ferroehrome with same chemical composition, but the charge material with larger size can＇t be charged in AOD by high level bin to finish alloying. With analysis on 60 t AOD refining stainless steel decarburization model and commercial pro- duction practice, the method of charge material ferrochrome adding in scrap charging bucket is used and the operation mod- el to adding material after charging hot metal is adopted with controlling bath liquid temperature 1 550 - 1 600 ℃ before charging, adding 200 kg/t charge material ferrochromium to replace high carbon ferrochromium and applying oxygen inten- sity 2.0- 2. 5 m3/（ t·min）, the stability of operation with once adding charge material ferrochromium realizes and the cost of production decreases.