A8

UNS #T30108

A8 is a medium carbon, air-hardening tool steel that is characterized by a combination of very good toughness, intermediate wear resistance, and excellent dimensional stability in heat treatment. Has been used for punches that operate in the 55 to 60 Rockwell C hardness range. For hot work toolling applications, A8 tool steel provides better resistance to erosion, wear and wash-out then the typical chromium-molybdenum hot work steels such as H11 and H13. This alloy is not recommended for hot applications where thermal fatigue (heat checking) is the primary failure mode.

Type Analysis

  • Carbon (Nominal) 0.55
  • Silicon (Maximum) 0.95
  • Tungsten (Nominal) 1.25
  • Manganese (Maximum) 0.3
  • Chromium (Nominal) 5
  • Molybdenum (Nominal) 1.25
  • Iron (Nominal) Balance

Applications

punches, drift pins, pneumatic tools, forming dies, blanking dies, chuck jaws, hammers, hot rolls, and hot and cold shear knives."

Applicable Specifications

Bar

Flats

Rounds

Square

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