真空感应炉冶炼含氮不锈钢的合金增氮工艺

Adding Nitrogen Process by Alloy for Melting Nitrogenous Stainless Steels in Vacuum Induction Furnace

摘要试验研究了200kg真空感应炉冶炼含氮不锈钢Crl3（0．04％～0．06％N）、Cr23Nil9（0．22％-0．28％N）和Cr22Ni9（0．15％-0．19％N）时，在（0．1-0．6）×10’Pa氩气或氮气下加氮4gfh（56．2％Cr、7．33％N）增氮工艺。结果表明，在氮气保护下加氮化合金，氮回收率为80％以上；在氩气保护下加氮化合金，氮回收率仅为10％。提高炉内氮气压力，控制合适的加入温度，加入小粒度氮化铬，氮的回收率可达100％。

The adding nitrogen processes by added nitrided ferrochrome （56. 2%Cr, 7.33%N） with （0. 1 -0. 6） × 10^5 Pa argon or nitrogen atmosphere in 200 kg vacuum induction furnace for melting nitrogenous stainless steel Crl3 （0. 04% -0. 06%N） , Cr23Ni19 （0. 22% -0. 28%N） and Cr22Ni9 （0. 15% -0. 19%N） have been tested and studied. Results showed that with added nitride alloy in nitrogen atmosphere the yield of nitrogen was more than 80%, while with added nitride alloy in argon atmosphere the yield of nitrogen only 10%. With increasing nitrogen pressure in furnace, controlling suitable adding temperature and adding smaller size nitride ferrochrome, the yield of nitrogen was up to 100%.