Martensitic stainless steel for high hardness and corrosion resistance with excellent cold workability and its manufacturing method

摘要

Problem to be solved: to provide a high strength and high corrosion resistance martensitic stainless steel and a method of producing the same, which are remarkably improved in the softening property, as a material for cold forming or cold forging parts of complicated shapes.High strength and high corrosion resistant martensitic stainless steel excellent in cold workabilityMass%C: 0.15 to 0.70%Si: 0.1 to 2.0%Mn: 0.15 to 1.5%S: less than 0.01%P: 0.05% or lessNi: 1.5% or lessCr: 10.5 to 16.0%Mo: 0.9-3.0%N: 0.14% or lessAl: less than 0.008%O: 0.004 to 0.014%C + n / 2: 0.14-0.70%;And1 μ Carbonyl nitride over μ More than 10 in m2;Average diameter size of oxide μ AndHV hardness. Ltoreq. (60C + 170).No selection