SAE-AISI M2 (T11302) Molybdenum High-Speed Steel

SAE-AISI M2 steel is a tool steel. M2 is the designation in both the SAE and AISI systems for this material. T11302 is the UNS number.

The properties of SAE-AISI M2 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare SAE-AISI M2 steel to: tool steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Annealed M2 Tool Steel Hardened M2 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

77 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

760 to 2150 MPa 110 to 310 x 10³ psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1610 °C 2940 °F

Melting Onset (Solidus)

1570 °C 2850 °F

Specific Heat Capacity

440 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

22 W/m-K 13 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

8.4 g/cm³ 520 lb/ft³

Embodied Carbon

8.8 kg CO₂/kg material

Embodied Energy

130 MJ/kg 57 x 10³ BTU/lb

Embodied Water

98 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

25 to 71 points

Strength to Weight: Bending

22 to 44 points

Thermal Diffusivity

5.9 mm²/s

Thermal Shock Resistance

27 to 76 points

Alloy Composition

Iron (Fe)Fe		78.5 to 83.4
Tungsten (W)W		5.5 to 6.8
Molybdenum (Mo)Mo		4.5 to 5.5
Chromium (Cr)Cr		3.8 to 4.5
Vanadium (V)V		1.8 to 2.2
Carbon (C)C		0.78 to 1.1
Silicon (Si)Si		0.2 to 0.45
Manganese (Mn)Mn		0.15 to 0.4
Nickel (Ni)Ni		0 to 0.3
Copper (Cu)Cu		0 to 0.25
Phosphorus (P)P		0 to 0.030
Sulfur (S)S		0 to 0.030