UNS #T20813

H13, equivalent to 883 tool steel, is a 5% chromium, hot work tool steel designed particularly for applications requiring extreme toughness combined with good red hardness. It will provide an extra margin of safety in tools subject to hammer blows and those tools containing deep recesses and sharp corners. While H13 die steel has been designed primarily as a hot work tool steel, it has found many applications in cold work tools where extra toughness is required at the sacrifice of some wear resistance.

Type Analysis

  • Carbon (Nominal) 0.41
  • Silicon (Maximum) 1
  • Manganese (Maximum) 0.35
  • Chromium (Nominal) 5.35
  • Molybdenum (Nominal) 1.4
  • Iron (Nominal) Balance
  • Vanadium (Nominal) 0.9


CarTech No. 883 tool steel has been used for hot working tools requiring the greatest possible toughness. Typical applications have included: Aluminum extrusion dies Bolt dies Bulldozer dies Die casting dies Forging dies Forming punches Heavy duty compression tools Hot forging tools with deep recesses and sharp corners Hot piercing punches Vastoning dies If necessary, hot work tools made from this alloy can be water cooled in service without danger of cracking or heat checking. Because of the extreme toughness of No. 883 tool steel, it could also be considered for cold work applications where other steels have failed by breaking.

Applicable Specifications

  • ASTM A681
  • QQ-T-570




Technical Information


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