Uddeholm Impax Supreme


Uddeholm Impax Supreme is a prehardened tool steel with very good through hardness properties, combined with excellent toughness and easy of machining in its harden state. It is suitable for a wide range of hot work applications in the support or holder block areas. 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 saver, e.g. no waiting for heat treatment, direct to machining operations
  • Lower tool cost (e.g. no distortion to rectify)
  • Modifications easily carried out

If the application allows it can be subsequently nitrided to increase surface wear resistance or locally flame hardened to reduce surface damage.

  • Good surface finishes possible as high polishability
  • Good machinability
  • Good weldability
  • High purity and good homogeneity
  • Uniform hardness
  • Sustainable tool steel: 96,44% recycled content

Uddeholm Impax Supreme

  • Machinability 50%
  • Wear resistance 30%
  • Corrosion resistance 60%
  • Toughness 90%
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Chemical composition
C 0.37 Si 0.30 Mn 1.40
Cr 2.00 Mo 0.20 Ni 1.00
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