Tin-containing high-nitrogen martensitic stainless steel alloy material and manufacturing method thereof

The invention relates to a tin-containing high-nitrogen martensitic stainless steel which is prepared from the following components in percentage by mass: at most 0.04% of C, at most 1.0% of Si, at most 2.0% of Mn, at most 0.02% of P, at most 0.02% of S, 0.05-0.3% of N, 12.0-18.0% of Cr, 0.05-1.0% of Sn, and the balance of Fe and inevitable impurity. The content of tin varies as the content of Cr varies, and the maximum content of tin must be 3.4% less than the content of Cr. The martensitic stainless steel has excellent mechanical properties, favorable corrosion resistance and excellent processability, can be processed into products in various shapes, and is applicable to the fields of general industrial machinery and the like.