Daido Steel - DH31-EX
Daido high performance hot work steel

Chemical Content(%):
Daido patent material

Delivered Hardness:
Annealed to HB235(max), surface hardness of HRC43-52 can be attained with proper heat treatment


  • Better hardenability that offers higher toughness throughout large size dies comparing with DH31-S
  • Improved fatigue strength
  • Good fracture toughness, heat checking resistance, resistance to hot erosion
  • Improved machinability

Major Application:

  • Medium to large size light-alloy die casting dies
  • Parts for die casting dies
  • Al alloy die extrusion die
  • Hot forging dies


 LKM Steel Rainbow Chart