D7 Tool Steel Technical Data
(Rounds Only)

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Chemical Analysis
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. (ºF):
Hardness Rc
As-Quenched
66
300
64
400
63
500
61.5
600
60.5
700
60.5
800
61
900
61.5
1000
60
1100
52.5
1200
45

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.

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