4140 Annealed Tool Steel
| Chemical Analysis: | |
|---|---|
|
Carbon |
.36/.44 |
| Manganese | .70/1.10 |
| Phosphorus | .035 Max. |
| Sulfur | .040 Max. |
| Silicon | .15/.35 |
| Chromium | .75/1.20 |
| Vanadium | ------- |
| Tungsten | ------- |
| Molybdenum | .15/.25 |
| Cobalt | ------- |
| Tempering Temp. º(F): | Hardness Rc |
|---|---|
| As-quenched | 60.1 |
| 400 | 57.8 |
| 500 | 53.4 |
| 600 | 49.5 |
| 700 | 46.1 |
| 800 | 42.9 |
| 900 | 38.8 |
| 1000 | 34.1 |
| 1100 | 31.1 |
| 1200 | 27.7 |
| 1300 | 23.5 |
Uses:
Brake die, support tooling, die holders, short run stamping and bending dies.
Forging/Rolling:
Heat slowly and uniformly to a temperature of from 1800° F to 2000° F. Do not forge or roll below 1600° F.
Annealing:
Heat slowly to 1500° F, and hold for 1/2 hour per inch of thickness. Furnace cool at 20° F per hour to 1230° F; air cool to room temperature. Expected Brinell hardness 197 max.
Hardening:
Heat to 1500° F - 1600° F and hold 1/2 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 1 hour per inch of thickness. A single temper is sufficient. 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.