The solubility of nitrogen in solid stainless steel 304

304L

301S and 301L (γ-phase) and in melts of austenite stainless steel has been calculated by using thermodynamic analysis method to get computational model for solubility of nitrogen in the steels

and the experimental research on nitriding behavior in four austenite stainless steels has been carried out by 1 kg MoSi electric resistance furnace with 33-100 kPa at 1520 ~1580 ℃. Results show that the solubility of nitrogen in y- phase in solid austenite stainless steels is highest; in cooling and solidifying process at normal pressure there is a transformation process from liquid phase

δ-phase to γ-phase; the nitrogen content in austenite steel shall decrease if supersaturated nitrogen to 8- phase in melt of stainless steel precipitates as gas bubble

so it is available to melt high nitrogen austenite stainless steel by using quick cooling at normal pressure or pressurized casting.