Product Description

BÖHLER M789 AMPO is a newly developed maraging steel, which combines the mechanical properties of 1.2709 with the corrosion resistance of 17-4PH. This patent bending grade can easily printed without any preheating and achieves a hardness of about 52 HRC with a very easy heat treatment. Furthermore, this material shows an excellent polishability, which makes it the ideal choice for inserts with conformal cooling in plastic injection molding and in any other application where a high hardness and corrosion resistance is of need.

Melting Route


Property Features

  • Toughness & Ductility: high
  • Wear Resistance: good
  • Machinability: very high
  • Dimensional stability: very high
  • Polishability: very high
  • Corrosion resistance: very high
  • Micro-cleanliness: very high

Technical Specifications

Material Numbers

BÖHLER patent

Chemical Composition

< 0.02 12.20 1.00 10.00 1.00 0.60

Chemical composition (average %)


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