4140 Ann
Chemical
Analysis: |
|
|
Tempering Temp.
º(F) |
Hardness Rc |
|
Carbon
|
.36/.44
|
|
As-quenched |
60.1 |
| Manganese |
.70/1.10 |
|
400 |
57.8 |
| Phosphorus |
.035
Max. |
|
500 |
53.4 |
| Sulfur |
.040
Max. |
|
600 |
49.5 |
| Silicon |
.15/.35 |
|
700 |
46.1 |
| Chromium |
.75/1.20 |
|
800 |
42.9 |
| Vanadium |
------- |
|
900 |
38.8 |
| Tungsten |
------- |
|
1000 |
34.1 |
| Molybdenum |
.15/.25 |
|
1100 |
31.1 |
| Cobalt |
------- |
|
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.
© Copyright 1999 Diamond Metals Corporation.
All Rights Reserved.
|
