SAE-AISI M50 (T11350) Molybdenum High-Speed Steel

SAE-AISI M50 steel is a tool steel. M50 is the designation in both the SAE and AISI systems for this material. T11350 is the UNS number.

The properties of SAE-AISI M50 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 M50 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 M50 Tool Steel Hardened M50 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

75 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

720 to 2250 MPa 110 to 330 x 10³ psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1480 °C 2700 °F

Melting Onset (Solidus)

1440 °C 2630 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

35 W/m-K 21 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.0 % relative

Density

7.9 g/cm³ 490 lb/ft³

Embodied Carbon

5.1 kg CO₂/kg material

Embodied Energy

74 MJ/kg 32 x 10³ BTU/lb

Embodied Water

83 L/kg 9.9 gal/lb

Common Calculations

PREN (Pitting Resistance)

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

26 to 80 points

Strength to Weight: Bending

23 to 49 points

Thermal Diffusivity

9.7 mm²/s

Thermal Shock Resistance

21 to 66 points

Alloy Composition

Iron (Fe)Fe		87 to 90.4
Molybdenum (Mo)Mo		3.9 to 4.8
Chromium (Cr)Cr		3.8 to 4.5
Vanadium (V)V		0.8 to 1.3
Carbon (C)C		0.78 to 0.88
Silicon (Si)Si		0.2 to 0.6
Manganese (Mn)Mn		0.15 to 0.45
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