4142 H.T. Tool Steel
| Chemical Analysis: | |
|---|---|
| Carbon | .38/.46 |
| Manganese | .70/1.70. |
| Phosphorus | .035 Max. |
| Sulfur | .040 Max. |
| Silicon | .15/.35 |
| Chromium | .75/1.20 |
| Vanadium | .10 Max. |
| 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 1750° F to 1850° F. Cool slowly from the forging or rolling temperature.
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:
4142 material is prehardened from the mill to a hardness of BHN 270/320 in thicknesses to 4" inclusive and BHN 260/310 in thicknesses over 4" to under 6" inclusive. CAUTION: 4142 material must be annealed prior to rehardening treatment to obtain a higher hardness. Heat treat the same as 4140.
Tempering:
No tempering is required, since the material is already prehardened at the mill. If the material is rehardened to obtain a higher hardness, the above tempering table may be used as a guide. Parts should be held a minimum of 1 hour per inch of thickness. A single temper is sufficient. However, since 1/2" dia. specimens were used for this test, it may be found that heavier sections are several points lower.