High strength martensitic stainless steel alloys, methods of forming the same, and articles formed therefrom

By mass percent, 11.0*12.5% of chromium, 1.0*2.5% of molybdenum, 0.15*0.5% of titanium, 0.7*1.5% of aluminum, It is the precipitation-hardening type martensite system stainless steel containing 0.5*2.5% of copper, 9.0*11.0% of nickel, 0.02 or less % of carbon, 2.0 or less % of tungsten, and 0.001 or less % of boron. Moreover, the goods formed from this stainless steel and the method of forming them are also indicated.