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Uddeholm Unimax


Uddeholm Unimax is a high hardness hot work tool steel which provides great wear resistance even over extended time at elevated temperatures. It performs very well in precision forging and hot stamping.

  • Improved durability and wear resistance in moulding processes that wear hard on the mould like, long run production, moulding of reinforced plastics and compression moulding
  • Longer tool life and a smoother production run with fewer disturbances for maintenance due to the high ductility
  • Problem solver in severe cold work applications where high chipping resistance is required
  • The high hardness and toughness together with the good dimension stability makes Unimax suitable as a substrate steel for surface coating when needed
  • The very good hardenability and the unique properties profile of Unimax make it especially suitable for larger moulds. Unimax is therefore supplied in larger dimensions
  • Excellent toughness and ductility in all directions
  • Good wear resistance
  • Good dimension stability at heat treatment and in service
  • Excellent through-hardening properties
  • Good resistance to tempering back
  • Good hot strength
  • Good thermal fatigue resistance
  • Excellent polishability

Tooling applications

  • Long run plastic moulds – injection moulding, compression moulding, extrusion moulding
  • Moulds for reinforced plastics
  • Moulds for bigger parts
  • Heavy duty blanking
  • Cold forging
  • Thread rolling
  • Hot work applications requiring high hardness and toughness


  • Engineering applications requiring high hardness and toughness
  • Wood pellet dies
  • Household waste recycling
  • Metal recycling
  • Tyre recycling
  • Wood recycling
  • Refrigerator recycling

Uddeholm Unimax

  • Hot wear resistance 60%
  • Plastic deformation resistance 60%
  • Heat checking resistance 70%
  • Premature cracking resistance 40%

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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