Uddeholm RoyAlloy™ is a 400 series martensitic stainless steel supplied prehardened. It is characterized by:

  • Excellent machinability
  • Good corrosion resistance
  • Uniform and consistent hardness in all dimensions
  • Good resistance to indentation (compressive strength)
  • Excellent ductility
  • Excellent flatness
  • Dimensionally stable
  • Smooth as rolled surfaces
  • Excellent weldability
  • Good thermal conductivity


Uddeholm RoyAlloy™ is an improved stainless grade designed specifically for plastic molding applications. Chemical composition and thermal treatments provide physical properties and microstructures designed to provide:

  • Reduced mold maintenance costs
  • Worry free weld repair
  • Dimensional stability
  • Lower mold production costs due to less cutting tool wear and increased cutting speeds
Title Type/Filesize Download

Uddeholm Royalloy Data Sheet (Rev. 1, 03.2012)

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