D2 Tool Steel
|Tempering Temp. º(F):||Hardness Rc|
Slitter knives, planer knives, shear blades, plastic granulator knives, punches, dies, form rolls, rolls, thread roll dies.
Preheat to 1250° F and soak thoroughly. Then raise to 1950° F - 2050° F. Do not forge or roll below 1700° F, cool slowly from the forging or rolling temperature. Do not normalize.
Heat slowly to 1600° F - 1650° F, and hold for uniformity. Cool at a rate of 20° F per hour to 900° F. Furnace cool slowly. Expected Brinell hardness 229 max.
Preheat to 1200° F - 1250° F, soak until uniformly heated, and either transfer or raise furnace temperature to 1850° F, and hold 1 hour per inch of greatest thickness. Quench into 150° F oil.
Temper immediately after quenching, before part has cooled to below 150° F. D-2 parts should always be double tempered and the parts should be held a minimum of 2 hours per inch of greatest thickness. For most applications the tempering range for the D-2 analysis is 900° F - 960° F. The above tempering table may be used as a guide. However, since 1/2" dia. specimens were used for this test, it may be found that heavier sections are several points lower.