D2 Flat

D2 Flat


Std. cut tolerance -.00″/+.125″

Due to material handling and processing items may have light scratching. Raw Material is not meant to have a finished cosmetic look

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D2 Flat Tool Steel

This grade of tool steel has a high carbon and chrome composition which makes it ideal for production runs. It’s a tool & die standard due to its high durability and stability as well as its resistance to abrasions and air-hardening capabilities. Tool and die makers find it useful for blanking dies, cold forming dies, stamping dies, slitters, punches, trim dies and thread rolling dies.

Heat Treating

Forging: Start slow to uniformly heat the D2 to 1850°-1950°F. Reheat as necessary. Stop working when the temperature drops below 1700°F. Cool very slowly in lime, mica, dry ashes, or furnace after forging. Always anneal D2 after forging.

Annealing: Heat slowly at a rate of 400°F per hour to 1550°-1600°F, hold for one hour per inch of maximum thickness for a minimum of 2 hours. Then cool slowly in the furnace lowering the heat about 40°- 50°F each hour until it reaches 1000°F. The cooling rate may be increased once the metal reaches 1000°F. Take precautions to prevent excessive carburization or decarburization.

Hardening: Prior to hardening, preheat slowly to 1350° – 1450°F and hold until uniformly heated. To harden, heat to 1800° – 1850°F and hold at this temperature until it is completely heated.

Quenching: Air or pressurized gas cooling to 150°-125°F. To prevent scaling and decarburization of the surface, it’s recommended to quench in a controlled atmosphere or vacuum furnace. If unavailable, pack hardening, salt baths, or wrapping the piece in stainless steel foil will provide some surface protection.

Tempering: Temper in the 300° – 400°F range immediately after quenching. Hold at the temperature for 1 hour per inch of thickness or a 2-hour minimum then cool to ambient temperature. For a lower hardness, tempering at 950°F gives the best combination of hardness and toughness. 


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