M-2 Tool Steel Technical Data
M-2 is a tungsten-molybdenum high-speed steel and is a popular grade for general purpose cutting and non-cutting applications. It has a wider heat-treating range than most of the molybdenum high-speed steels, coupled with a resistance to decarburization that is characteristic of tungsten types. M-2 offers an excellent combination of red hardness, toughness, and wear resistance.
Note: K-mac does not sell this grade - Data is for reference only.
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 |