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AISI A2 Features & Benefits

AISI A2 tool steel is a versatile, air hardening chromium alloy tool steel that replaces O1 tool steel. Tipco commonly uses AISI A2 in a variety of our products specifically punches. AISI A2 offers an excellent combination of good wear resistance and toughness. It is widely regarded as a “universal” cold work steel for cutting and forming applications.

Characteristics

AISI A2 steel is heat treatable and will offer a hardness in the range of 57-62 HRC. This steel delivers good toughness with medium wear resistance and is relatively easy to machine. AISI A2 is commonly used in applications which require good wear resistance and high toughness.

  • Good machinability
  • High compressive strength
  • High dimensional stability after hardening and tempering

AISI A2 Applications & Properties

AISI A2
Characteristics Air or oil chromium molybdenum vanadium tool steel

AISI A2
Typical Analysis % C
1.0
Si
0.3
Mn
0.6
Cr
5.3
Mo
1.1
V
0.2
Delivery Condition Soft annealed approx. 215 HB
Color Code Red / Green

AISI A2 HEAT TREATMENT
SOFT ANNEALING:
  • Protect the steel and heat through to 1560°F (850°C). Then cool in the furnace at 20°F (10°C) per hour to 1200°F (650°C), then freely in air
STRESS RELIEVING:
  • Between rough and semi-finish machining, the tool should be heated through to 1200°F (650°C), holding time of 2 hours
  • Cool slowly to 930°F (500°C) then freely in air
HARDENING:
  • Preheating temperature: 1200-1300°F (650-750°C)
  • Austenitizing temperature: 1690-1780°F (925-970°C) but usually 1720°-1760°F (940-960°C)
  • Hold for 30 minutes once the entire tool reaches temperature
  • Protect the part against decarburization and oxidation during hardening
QUENCHING MEDIA:
  • Quench as quickly as possible. Cooling must be uniform and rate must be adequate to avoid transformation products; however, risk of excessive distortion and/or quench cracking must be considered.
  • Oil (only for small and uncomplicated tools)
  • Martempering bath or fluidized bed at 360-430°F (180-220°C) or 840-1020°F (450-550°C) then cool in air
  • Vacuum furnace with overpressure of gas at cooling
  • Circulating air or atmosphere
TEMPERING:
  • Choose the tempering temperature according to the hardness required
  • Temper twice with intermediate cooling to room temperature
  • Lowest tempering temperature at 360°F (180°C)
  • Holding time at temperature for minimum 2 hours
  • Note: The hardness achieved is also dependent on the tool size
DIMENSIONAL CHANGES:
  • Dimensional change during hardening and tempering should not exceed 0.20% of the largest tool dimension per side, as long as the prescribed stress relief is performed

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