D7 Tool Steel

Chemical Analysis:
Carbon 2.15/2.50
Manganese .60 Max.
Phosphorus .030 Max.
Sulfur .030 Max.
Silicon .60 Max.
Chromium 11.50/13.50
Vanadium 3.80/4.40
Tungsten -------
Molybdenum .70/1.20
Cobalt -------
Tempering Temp. º(F): Hardness Rc
As-Quenched 66.0
300 64.0
400 63.0
500 61.5
600 60.5
700 60.5
800 61.0
900 61.5
1000 60.0
1100 52.5
1200 45.0

Uses:

Brick mold liners, sand slinger liners, dies, machine ways, track packer pads, tile die.

Forging/Rolling:

Preheat to 1500° F and soak thoroughly.  Then raise to 2050° F - 2125° F.  Do not forge or roll below 1800° F, cool slowly from the forging or rolling temperature.  Do not normalize.

Annealing:

Heat slowly to 1600° F - 1650° F, and hold for uniformity, furnace cool at a rate of 20° F per hour to 1000° F then air cool.  Expect Brinell hardness 235 - 262.

Hardening:

Preheat to 1500° F and soak until uniformly heated and either transfer or raise furnace temperature to 1850° F - 1950° F, and hold 1 hour per inch of greatest thickness.  Cool in still air.

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 maximum wear resistance temper at 300° 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.