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Grade 366 Molybdenum

Grade 366 molybdenum is a molybdenum alloy. Cited properties are appropriate for the stress relieved condition. It has a moderately high tensile strength and a moderately high density among alloys in the same category.

The graph bars on the material properties cards below compare grade 366 molybdenum to: molybdenum alloys (top), all alloys in the same category (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.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

300 GPa 44 x 106 psi

Elongation at Break

2.2 %

Poisson's Ratio


Shear Modulus

120 GPa 17 x 106 psi

Tensile Strength: Ultimate (UTS)

580 MPa 84 x 103 psi

Tensile Strength: Yield (Proof)

470 MPa 69 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Specific Heat Capacity

210 J/kg-K 0.051 BTU/lb-°F

Thermal Expansion

7.6 µm/m-K

Otherwise Unclassified Properties


12 g/cm3 750 lb/ft3

Embodied Carbon

27 kg CO2/kg material

Embodied Energy

340 MJ/kg 150 x 103 BTU/lb

Embodied Water

300 L/kg 36 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 MJ/m3

Resilience: Unit (Modulus of Resilience)

370 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

13 points

Strength to Weight: Bending

13 points

Thermal Shock Resistance

18 points

Alloy Composition

Molybdenum (Mo)Mo 66.9 to 73
Tungsten (W)W 27 to 33
Carbon (C)C 0 to 0.030
Silicon (Si)Si 0 to 0.010
Iron (Fe)Fe 0 to 0.010
Oxygen (O)O 0 to 0.0025
Nickel (Ni)Ni 0 to 0.0020
Nitrogen (N)N 0 to 0.0020

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Further Reading

ASTM B386: Standard Specification for Molybdenum and Molybdenum Alloy Plate, Sheet, Strip, and Foil

ASTM B387: Standard Specification for Molybdenum and Molybdenum Alloy Bar, Rod, and Wire

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010