Abstract: Precipitation of nitrides and carbides in high nitrogen austenitic stainless steels after solution treatment and aging was investigated by using a physicochemical phase analysis method. The character, particle size distribution, content and structural formulae of phases in the alloy were determined. It is shown that the precipitate is mostly M₂₃C₆ carbide in 1Cr22Mn15N0.6 steel and (CrFe)₂N_1-x nitride in 1Cr22Mn15N0.9 steel respectively, and its volume fraction increases with prolonging the aging time.