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Uddeholm Impax Supreme


Uddeholm Impax Supreme is prehardened mould steel with very good polishing and photo etching properties. It is suitable for a wide range of injection moulds, blow moulds and extrusion dies for plastic. Uddeholm Impax Supreme is supplied at 290-330 HB. In east/south east asian countries served by Assab Uddeholm Impax Supreme is sold as AS 718 Supreme.

  • Prehardened gives following benefits:
    • No hardening risks
    • No hardening costs
    • Time saving, e.g. no waiting for heat treatment
    • Lower tool cost (e.g. no distortion to rectify)
    • Modifications easily carried out
  • Can be subsequently nitrided to increase surface wear resistance or locally flame hardened to reduce surface damage
  • Good polishing and photo-etching properties
  • Good machinability
  • High purity and good homogeneity
  • Uniform hardness

Plastic moulding

  • Injection moulds for thermoplastics
  • Extrusion dies for thermoplastics
  • Blow moulds

Hot Work applications

  • Forming tools, press-brake dies (possibly flame hardened or nitrided)
  • Aluminium die casting prototype dies
  • Zinc die casting dies


  • Milling cutters
  • Shafts
  • General purpose components

Uddeholm Impax Supreme

  • Hot wear resistance 0%
  • Plastic deformation resistance 0%
  • Heat checking resistance 0%
  • Premature cracking resistance 0%

Reference Grade Hot Work (H13)

  • Hot wear resistance 40%
  • Plastic deformation resistance 40%
  • Heat checking resistance 40%
  • Premature cracking resistance 35%

Chemical composition


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