ASSAB Dievar Datasheet

Wrought Tool Steel

Supplied by ASSAB Pacific Pte. Ltd.

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Product Description
Dievar is a high performance chromium-molybdenum-vanadium alloyed hot work tool steel which offers a very good resistance to heat checking, gross cracking, hot wear and plastic deformation. Dievar is characterized by:
  • Excellent toughness and ductility in all directions
  • Good temper resistance
  • Good high-temperature strength
  • Excellent hardenability
  • Good dimensional stability throughout heat treatment and coating operations

Improved tooling performance
Dievar is a premium hot work tool steel developed by Uddeholm. It is manufactured utilizing the very latest in production and refining techniques. The Dievar development has yielded a die steel with the ultimate resistance to heat checking, gross cracking, hot wear and plastic deformation. The unique properties profile of Dievar makes it the best choice for die casting, forging and extrusion.

Heat checking is one of the most common failure mechanism e.g. in die casting and now days also in forging applications. Dievar's superior ductility yields the highest possible level of heat checking resistance. With Dievar's outstanding toughness and hardenability the resistance to heat checking can further be improved. If gross cracking is not a factor then a higher working hardness can be utilized (+2 HRC).

Regardless of the dominant failure mechanism; e.g. heat checking, gross cracking, hot wear or plastic deformation. Dievar offers the potential for significant improvements in die life as well as tooling economy.

Dievar is the material of choice for the high demand die casting, forging and extrusion industries.
Material Status 
  • Commercial: Active
  • Asia Pacific
Available Documents
Technical Datasheet (English)
Metals General
Nominal Value
Metal Type (Hot Worked and Annealed)
Metals Physical
Nominal Value
Density (68°F)
Metals Mechanical
Nominal Value
Tensile Strength (Ultimate) 2 (73°F)
Tensile Strength (Yield), 0.2% 2 (73°F)
Tensile Elongation (Break) 2 (73°F)
Reduction of Area 2 (73°F)
Hardness (HB-Scale)
Tensile Modulus (68°F)
Metals Thermal
Nominal Value
Mean CTE (68 to 752°F)
Thermal Conductivity (752°F)
1Typical properties: these are not to be construed as specifications.
2Hardness: 44 HRC
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