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

Uddeholm Impax Supreme

  • Corrosion resistance 20%
  • Wear resistance 30%
  • Polishability 60%
  • Toughness 90%
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  • Flat Bar

    Flat Bar

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  • Other services

    Other services

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  • Plate


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  • Round Bar

    Round Bar

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Chemical composition
Carbon 0.37 Silicon 0.30 Manganese 1.40
Chromium 2.00 Molybdenum 0.20 Nickel 1.00
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