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D2 Tool Steel

D2 steel is an air-hardening, high-carbon, high-chromium tool steel. It has high wear and abrasion-resistant properties. It is heat treatable and will offer a hardness in the range 55-62 HRC, and is machinable in the annealed condition. D2 steel shows little distortion on correct hardening. D2 steel’s high chromium content gives it mild corrosion-resisting properties in hardened condition.

If you need better machinability then consider A2 tool steel which has a chromium content of 5% and is more readily machinable.

Related Specifications
AISI ASTM A681 DIN 17350 BS EN ISO 4957

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Applications

Typical Analysis

Ground Flat Stock

Forging

Annealing

Hardening

Tampering

Applications

Typical applications for D2 Steel:
Stamping or Forming Dies
Punches
Forming Rolls
Knives, slitters, shear blades
Tools
Scrap choppers
Tyre shredders

Typical Analysis

Carbon	1.55%	Chromium	12.00%
Manganese	0.45%	Molybdenum	0.85%
Vanadium	0.80%

Ground Flat Stock

Precision ground flat stock / gauge plate can be produced using D2 tool steel. Subject to size, suitability and availability pieces can be produced in approximately 2 to 3 weeks. Standard and non-standard sizes are available.

Forging

Heat slowly and uniformly to 700°C then more rapidly to 900/1040°C. Do not continue to forge D2 below 925°C. Reheat as often as necessary to maintain proper forging temperature. After forging cool slowly. This is not an annealing process. After the forging is cold, it must be annealed as described below.

Annealing

Heat uniformly to 843/871°C, then slow furnace cool at a rate of not more than 10°C per hour. After annealing D2 a maximum hardness of 240 Brinell may be achieved

Hardening

D2 tool steel is extremely sensitive to overheating during hardening – do not overheat.

Pre heat slowly to 750/780°C and soak. Continue heating to the final hardening temperature of 1000/1030°C and allow the component to equalize. Quench in oil or cool in air.

Tampering

Heat uniformly and thoroughly to the desired temperature and hold for 25 minutes per cm of thickness. D2 can be double tempering at approximately 15°C below the first tempering, after intermediate cooling to room temperature.