ASSAB 618 HH
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 |