高氮Fe-Cr-Mn-Ni系奥氏体不锈钢的加压感应熔炼

采用MgO坩埚高频真空感应炉在氮气压力0.45~1.0MPa、温度1640~1700℃下,对加压感应熔炼高氮Fe-Cr-Mn-Ni系奥氏体不锈钢进行了实验研究。结果表明,1913K、1.0MPa氮气氛中Cr12、Cr17Mn5Ni5、Cr19Mn15和Cr20Mn8不锈钢中氮的溶解度分别为0.391%、0.692%、1.120%和0.899%,氮在液态不锈钢中的溶解与Sievert定律有所偏离;氧浓度在350×10^-6内,1913K、1.0MPa氮气氛中Cr20Mn8钢液的吸氮反应仍为一级反应,其传质系数为0.023cm·s^-1;随钢中氧浓度的增加,液态钢的吸氮速率和钢液中的平衡氮含量显著降低。

Pressurized Induction Melting of High Nitrogen Fe-Cr-Mn-Ni Austenite Stainless Steel

The pressurized induction melting of high nitrogen Fe-Cr-Mn-Ni austenite stainless steel has been tested using MgO crucible high induction furnace with nitrogen pressure 0.45-1.0 MPa between temperature 1640 (1913 K) and 1700 °C (1973 K) . The results showed that with 1.0 MPa nitrogen atmosphere at 1913 K the solubility of nitrogen in molten stainless steel Cr12, Cr17Mn5Ni5, Cr19Mn15 and Cr20Mn8 was respectively 0.391%, 0.692%, 1.120% and 0.899%, and it was found that to a certain extent the nitrogen dissolution in molten stainless steel deviated from Sievert^,s law; while the oxygen content lower than 350 x 10^-6, with 1.0 MPa nitrogen atmosphere at 1913 K, the reaction of absorbed nitrogen in molten steel Cr20Mn8 still was first order reaction, its mass transfer coefficient was 0.023 cm?s^-1 ; and with oxygen content increasing in molten steel the nitrogen dissolving rate and equilibrium nitrogen content in molten steel markedly decreased.