SAE-AISI M44 (T11344) Cobalt High-Speed Steel

SAE-AISI M44 steel is a tool steel. M44 is the designation in both the SAE and AISI systems for this material. T11344 is the UNS number. It has the lowest thermal conductivity among the tool steels in the database.

The properties of SAE-AISI M44 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 M44 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 M44 Tool Steel Hardened M44 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

78 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

870 to 2290 MPa 130 to 330 x 10³ psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1590 °C 2890 °F

Melting Onset (Solidus)

1540 °C 2800 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

14 W/m-K 7.9 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

43 % relative

Density

8.4 g/cm³ 530 lb/ft³

Embodied Carbon

9.9 kg CO₂/kg material

Embodied Energy

150 MJ/kg 63 x 10³ BTU/lb

Embodied Water

170 L/kg 20 gal/lb

Common Calculations

PREN (Pitting Resistance)

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

28 to 75 points

Strength to Weight: Bending

24 to 46 points

Thermal Diffusivity

3.7 mm²/s

Thermal Shock Resistance

27 to 70 points

Alloy Composition

Iron (Fe)Fe		65.3 to 70.6
Cobalt (Co)Co		11 to 12.3
Molybdenum (Mo)Mo		6.0 to 7.0
Tungsten (W)W		5.0 to 5.8
Chromium (Cr)Cr		4.0 to 4.8
Vanadium (V)V		1.9 to 2.2
Carbon (C)C		1.1 to 1.2
Silicon (Si)Si		0.3 to 0.55
Manganese (Mn)Mn		0.2 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