采用在感应炉炉底吹入氮气的方法熔炼超低碳不锈钢。结果表明,在1600—1700℃条件下,吹氮量为0．2—0．4Nm3/min·t,10—30分钟可使钢中碳降至0．005-0．02%,铬的回收率可达95%左右。同时可使钢中氮降至0.05%,钢中氢降至4ppm以下。试验中发现,采用弥散型透气砖具有气泡小而均匀的特点,比直通式和狭缝式透气砖更适用于本工艺。 Ultra-low carbon stainless steel is melted by blowing nitrogen gas into the bottom of the induction furnace. The results show that under the condition of 1600-1700 ℃, the amount of nitrogen blown is 0.2-0.4Nm3 / min · t, and the content of carbon in steel can be reduced to 0.005-0.02% in 10-30 minutes. The recovery of chromium The rate of up to 95%. At the same time, the nitrogen in steel can be reduced to 0.05%, and the hydrogen content in the steel drops below 4ppm. The test found that the use of diffuse air-blown brick with small and uniform bubbles than the straight-through and slot-type breathable brick more suitable for the process.