The ferritic stainless steel and the martensitic stainless steel which are superior in machinability

摘要

This stainless steel, C density 0.1 mass % above or Sn and In density 10 mass % 0.2 volume % of Cu rich phase above makes the matrix disperse in ratio above. Cu rich phase, from after the hot rolling until it becomes the end product, disperses precipitates to the matrix the aging processing which between it heats keeps of 1 hours or more in the temperature range of 500 - the 900C by 1 times or more administering. C: 0.01 - 1%, Si: 1.0% or less, Mn: 1.0% or less, Cr: 15 - 30%, Ni: 0.60% or less, Cu: The ferritic stainless steel which includes 0.5 - 6.0%, C: 0.01 - 0.5%, Si: 1.0% or less, Mn: 1.0% or less, Cr: 10 - 15%, Ni: 0.60% or less, Cu: The martensitic stainless steel which includes 0.5 - 6.0% is used. S, replacing to the free-cutting element addition of Pb, and the like martensitic system, machinability of the ferritic stainless steel is improved without exerting adverse effect on environment and the like by making disperse makes precipitate Cu rich phase, processability, corrosion resistance.