The invention provides a method for improving the
intergranular corrosion resistance capacity of
austenitic stainless steel. The method comprises the following steps that
sensitization treatment is carried out, specifically, heating treatment and
sensitization treatment are carried out on the
austenitic stainless steel, so that
chromium carbide is separated out between
crystal particles, and the sensitized stainless steel is obtained; the sensitized stainless steel is continuously heated to 880 DEG C-950 DEG C through
atomic diffusion treatment, and the stainless steel is subjected to heat preservation; and then the stainless steel is cooled to the
room temperature. According to the method, the
chromium carbide is separated out between the
crystal particles of the
austenitic stainless steel through
sensitization treatment firstly, so that the content of
chromium between the
crystal particles is low; then chromium atoms in the austenitic stainless steel crystal particles are diffused tothe crystal boundary through
atomic diffusion treatment, so that the intergranular barren chromium phenomenon is eliminated, and the
intergranular corrosion resistance is achieved in a
stable state;and the method has the advantages that the
heating temperature is low, the fuel consumption is low, the thermal forming process does not need to avoid a sensitization region, the equipment requirementis low, normalizing treatment can be carried out with a
carbon steel material at the same time, the cost is low, and chemical components of an austenitic
stainless steel material do not need to be changed.