真空感应炉冶炼含氮不锈钢的合金增氮工艺

试验研究了200 kg真空感应炉冶炼含氮不锈钢Cr13(0.04%～0.06%N)、Cr23Ni19(0.22%～0.28% N)和Cr22Ni9(0.15%～0.19%N)时,在(0.1～0.6)×10⁵Pa氩气或氮气下加氮化铬(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%。

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

The adding nitrogen processes by added nitrided ferrochrome (56. 2%Cr, 7. 33% N) with (0. 1 ~0. 6) x 10⁵ Pa argon or nitrogen atmosphere in 200 kg vacuum induction furnace for melting nitrogenous stainless steel Crl3 (0. 04% ~0.06%N), Cr23Nil9 (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%.