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M-2 Tool Steel Technical Data
-
Carbon:
.78 / .88
-
Manganese:
.15 / .88
-
Silicon:
.20 / .45
-
Tungsten:
5.50 / 6.00
-
Molybdenum:
4.50 / 5.50
-
Chromium:
3.75 / 4.50
-
Vanadium:
1.75 / 2.20
-
Nickel:
.30 max.
- Forging:
- Start
forging at: 1900-2100°F (1038-1149°C)
- Do
not forge below: 1700°F (927°C)
- Normalizing:
Do not normalize
- Annealing:
- Temperature:
1600-1650°F (871-899°C)
- Rate
of cooling, max. per hour: 40°F (22°C)
- Typical
annealed hardness, Brinell: 212-241
- Hardening:
- Rate
of heating: Rapidly from preheat
- Preheat
temperature: 1350-1550°F (732-843°C)
- Hardening
temperature: 2175-2250°F (1191-1232°C)
- Time
at temperature, minutes: 2-5
- Quenching
medium: O, A, or S
- Tempering:
- Tempering
temperature: 1000-1100°F (538-593°C)
- Approx.
tempered hardness, Rockwell C: 60-65
- Wear
Resistance: Very High
- Toughness:
Low
- Resistance
to Softening Effect of Elevated Temperature: Very
High
- Depth
of Hardening: Deep
- Machinability:
Medium
- Grindability:
Low
- Distortion
in Heat Treating: A/S=Low O=Medium
- Safety
in Hardening: Medium
- Resistance
to Decarburization: High
| Density |
0.294 lb/in³ |
| Hardness,
Brinell |
217
- 255 |
| Modulus
of Elasticity |
30000 ksi |
| Charpy
Impact |
25.8 ft-lb |
| Charpy
Impact |
27.3 ft-lb |
| Charpy
Impact |
30.2 ft-lb |
| CTE,
linear 250°C |
6.39 µin/in-°F |
| CTE,
linear 500°C |
6.72 µin/in-°F |
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