A2 Tool Steel
|Tempering Temp. º(F):||Hardness Rc|
Punches, dies, trim dies, blanking dies, forming dies, compacting dies, die casting dies, stamping dies, can tooling, planer knives.
Preheat to 1250° F and soak thoroughly. Then raise to 2000° 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 1650° F, and hold for uniformity, cool at a rate of 20° F per hour to 1150° F reheat to 1350° F hold for 3 hours per inch of thickness; furnace cool at 20° F per hour to 1100° F, then furnace cool to 900° F and air cool. Brinell hardness 212 max.
Preheat to 1200° F - 1250° F, soak until uniformly heated, and either transfer or raise furnace temperature to 1750° F - 1775° 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. Parts should be held a minimum of 2 hours per inch of greatest thickness. Double tempering is recommended for the A-2 grade. For most applications the tempering range from the A-2 analysis is 350° F - 450° 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.