A2 Tool Steel

Chemical Analysis:
Carbon .95/1.05
Manganese 1.00 Max.
Phosphorus .030 Max.
Sulfur .030 Max.
Silicon .50 Max.
Chromium 4.75/5.50
Vanadium .15/.50
Tungsten -------
Molybdenum .90/1.40
Cobalt -------
Tempering Temp. º(F): Hardness Rc
As-Quenched 65.0
300 62.5
400 61.0
500 57.5
600 56.0
700 56.0
800 56.0
900 56.0
1000 55.0
1100 50.0
1200 45.0
1300 34.0

Uses:

Punches, dies, trim dies, blanking dies, forming dies, compacting dies, die casting dies, stamping dies, can tooling, planer knives.

Forging/Rolling:

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.

Annealing:

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.

Hardening:

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.

Tempering:

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.