Method for improving mechanical properties of 301LN austenitic stainless steel

The invention discloses a method for improving mechanical properties of 301LN austenitic stainless steel and belongs to the stainless steel preparation field. According to the method, a 301LN austenitic stainless steel blank which is 40-60 mm thick is subjected to hot rolling till a plate which is 4-5 mm thick is obtained; then cold rolling-annealing process treatment is performed; and the 301LN austenitic stainless steel with the yielding strength ranging from 700 MPa to 1000 MPa, the tensile strength ranging from 1000 MPa to 1200 MPa and the ductility larger than 30% is prepared. The method is easy to operate, and industrial production can be achieved conveniently.