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.