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Stainless Steel

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Stainless Steel

Stainless Steel

  • Steel alloy with a min. of 10.5% Cr for corrosion resistance
  • Passivation layer of Cr2O3 formed by addition of min. of 10.5% Cr
  • Addition of various components of Ni, Mo, N for improving corrosion resistance and workability Typically 13Cr steel, 18Cr-8Ni steel, Main component Cr forms very think Cr2O3 layer blocking further diffusion of oxygen into the base metal.
Steel Stainless Steel Carbon Steel
Layer Cr2O3
cr2o3
Fe-Oxide Layer
Fe-Oxide Layer
Features
  • Passive layer is extremely thin and blocks further diffusion of oxygen
  • Under extreme environment such as radiation, etc, the passive layer can be destroyed.
  • Passive layer is thick and porous, easily further diffusion of oxygen into base metal allowed.
  • Generally easily rusted in atmosphere environment, basically impossible to prevent from corrosion