Method for improving corrosion resistance and comprehensive mechanical property of low-carbon martensitic stainless steel

The invention belongs to the field of metal materials, particularly relates to a method for improving corrosion resistance and comprehensive mechanical properties of low-carbon martensitic stainless steel, and is suitable for development and application of novel high-performance low-carbon martensitic stainless steel. According to the low-carbon martensitic stainless steel, the content of chromium in the low-carbon martensitic stainless steel is comprehensively regulated and controlled to be 13.0%-14.0% (weight ratio, the same below), the content of molybdenum is 0.5%-0.8%, and the content of Cr + 2Mo is controlled to be 14.2%-15.6%; the lower the oxygen content is, the better the oxygen content is; then, through one-time normalizing and two-time tempering treatment, the pitting corrosion resistance and the uniform corrosion resistance of the material can be remarkably improved, meanwhile, the tempering degree of a martensite matrix in the material is moderate, inverted austenite with good size, shape and con