PACIFIC D2 is the most wear resistant of the commonly available grades of tool steel. It is deep hardening and has very low size change during heat treatment. Because of its inherent wear resistance, D2 has a low machinability rating when compared to other standard alloy tool steel grades. The high chromium content gives it mild corrosion resistance in the hardened condition.
Heat Analysis - ranges and limits %
Preheat to 1200/1300°F before raising to forging heat of 1850/2000°F. Stop forging at 1700°F. Cool slowly after forging.
Heat slowly to 1600/1650°F and hold at temperature 1-1/2 to 6 hours depending on part size. Cool at a maximum rate of 40°F per hour to 1000°F (cooling rate below 1000°F is not critical). Typical annealed hardness is 217/255 HB.
Heat to 1250/1300°F for 1 hour minimum at temperature and cool in air.
Preheat at 1500°F before raising to an austenitizing temperature of 1825/1875°F; soak 15 to 45 minutes at temperature before cooling in air to harden.
Temper immediately after the tool has cooled to 120/150°F. Double tempering is suggested (after cooling to room temperature from the first temper).
Tempering Temperature °F
Approximate Hardness, HRC
Shapes and Conditions Available
Annealed Rounds through 8" Diameter
SE® Flats & Squares from 3/8" through 2-1/2" Thickness