ASSAB 618 HH is a prehardened mould steel with a higher hardness, 340 – 380 HB, than ASSAB 618 and ASSAB 718 Supreme. The higher hardness gives an increased resistance to wear and indentations, which means enhanced mould life.

  • Injection moulds for thermoplastics
  • Extrusion dies for thermoplastics
  • Blow moulds
  • Forming tools, press-brake dies (possibly flame hardened or nitrided)
  • Aluminium die casting prototype dies
  • Structural components, shafts
Chemical composition
Carbon 0.37 Silicon 0.30 Manganese 1.40
Chromium 2.00 Nickel 1.00 Molybdenum 0.20
Sulphur =<0.015
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