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M-2
Chemical
Analysis: |
|
Tempering
Temp.
º(F) |
Oil Quenched Hardness
Rc
|
Air Quenched
Hardness Rc
|
|
Carbon
|
.78/.88
|
300 |
65.0 |
65.0 |
| Manganese |
.15/.40 |
400 |
64.0 |
63.0 |
| Phosphorus |
.030
Max. |
500 |
63.0 |
62.5 |
| Sulfur |
.030
Max. |
600 |
62.5 |
62.5 |
| Silicon |
.25/.45 |
700 |
63.0 |
62.5 |
| Chromium |
3.75/4.50 |
800 |
63.5 |
63.5 |
| Vanadium |
1.75/2.20 |
850 |
63.5 |
63.5 |
| Tungsten |
5.50/6.75 |
900 |
65.0 |
64.0 |
| Molybdenum |
4.50/5.50 |
950 |
66.0 |
65.0 |
| Cobalt |
------- |
1000 |
66.0 |
65.5 |
|
|
1050 |
66.0 |
63.5 |
|
|
1100 |
64.5 |
61.5 |
|
|
1150 |
62.0 |
60.0 |
|
|
1200 |
53.5 |
53.0 |
|
|
1300 |
43.0 |
39.5 |
Uses:
Drills, taps, punches, reamers, broaches, planer knives,
lathe tools, forge dies, form cutters, milling cutters, end mills, gear
cutters.
Forging/Rolling:
Preheat to 1300° F
- 1500° F and soak thoroughly. Then raise to
2050° F
- 2100° 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,
and hold for uniformity, cool at a rate of 30°
F per hour to 900° F, then
air cool. Expected Brinell hardness 241 max.
Hardening:
Preheat slowly to 1550°
F, soak until uniformly heated, and heat rapidly to 2250°
F - 2275° F. Heating times may vary from a few
minutes to a maximum of 15 minutes, depending on the size of the tool.
Oil quench to develop higher hardness, although air or hot salt quench
may be used.
Tempering:
Temper immediately after quenching, before the part
has cooled to below 150° F.
A tempering range of 1000° F - 1050° F
is recommended. Parts should be held a minimum of 2 hours per
inch of thickness. Double tempering is recommended. The
following tempering table may be used as a guide. 1" dia.
specimens were used for this test, it may be found that heavier sections
are several points lower. Table is based on a 2250° F hardening temperature.
© Copyright 1999 Diamond Metals Corporation.
All Rights Reserved.
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