Method for improving performance of niobium-containing precipitated phase of superaustenitic stainless steel by regulating and controlling boron and niobium

The invention discloses a method for improving the performance of a niobium-containing precipitated phase of superaustenitic stainless steel through boron and niobium regulation and control, and belongs to the technical field of stainless steel preparation. The microelements B and Nb are introduced, B and Mo are dissolved in a Nb (C, N) precipitated phase, and a (Nb, Mo) (B, C, N) precipitated phase is formed; the crystal boundary segregation effect of B is used for inhibiting sigma formation, so that a crystal boundary precipitated phase is reduced and finer; through slow cooling, heat preservation and aging treatment, fine and dispersed distribution of (Nb, Mo) (B, C and N) is further regulated and controlled; and meanwhile, precipitation of the Mo-containing precipitated phase at the grain boundary is delayed, and Mo precipitated phase grains are reduced. The strength and corrosion resistance of the superaustenitic stainless steel are improved through the combination of (Nb, Mo) (B, C, N) and Mo-rich preci