A-2
Chemical
Analysis: |
|
|
Tempering Temp.
º(F) |
Hardness Rc |
|
Carbon
|
.95/1.05
|
|
As-quenched |
65.0 |
| Manganese |
1.00
Max. |
|
300 |
62.5 |
| Phosphorus |
.030
Max. |
|
400 |
61.0 |
| Sulfur |
.030
Max. |
|
500 |
57.5 |
| Silicon |
.50 Max. |
|
600 |
56.0 |
| Chromium |
4.75/5.50 |
|
700 |
56.0 |
| Vanadium |
.15/.50 |
|
800 |
56.0 |
| Tungsten |
------- |
|
900 |
56.0 |
| Molybdenum |
.90/1.40 |
|
1000 |
55.0 |
| Cobalt |
------- |
|
1100 |
50.0 |
|
|
|
1200 |
45.0 |
|
|
|
1300 |
34.0 |
Uses:
Punches, dies, trim dies, blanking dies, forming dies,
compacting dies, die casting dies, stamping dies, can tooling, planer
knives.
Forging/Rolling:
Preheat to 1250° F
and soak thoroughly. Then raise to 2000°
F - 2050° F. Do not forge or roll below 1700° F, cool slowly from the forging or rolling temperature.
Do not normalize.
Annealing:
Heat slowly to 1650° F,
and hold for uniformity, cool at a rate of 20°
F per hour to 1150° F reheat to 1350°
F hold for 3 hours per inch of thickness; furnace cool at 20°
F per hour to 1100° F, then
furnace cool to 900° F and air cool. Brinell hardness 212
max.
Hardening:
Preheat to 1200° F
- 1250° F, soak until uniformly heated, and either
transfer or raise furnace temperature to 1750°
F - 1775° F, and hold 1 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
2 hours per inch of greatest thickness. Double tempering is recommended
for the A-2 grade. For most applications the tempering range
from the A-2 analysis is 350° F - 450° 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.
© Copyright 1999 Diamond Metals Corporation.
All Rights Reserved.
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