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Class 4 Tungsten vs. Grade 366 Molybdenum

Both class 4 tungsten and grade 366 molybdenum are otherwise unclassified metals. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is class 4 tungsten and the bottom bar is grade 366 molybdenum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 270
300
Elongation at Break, % 2.3
2.2
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 110
120
Tensile Strength: Ultimate (UTS), MPa 790
580
Tensile Strength: Yield (Proof), MPa 580
470

Thermal Properties

Latent Heat of Fusion, J/g 170
310
Specific Heat Capacity, J/kg-K 130
210
Thermal Expansion, µm/m-K 4.5
7.6

Otherwise Unclassified Properties

Density, g/cm3 16
12
Embodied Carbon, kg CO2/kg material 24
27
Embodied Energy, MJ/kg 360
340
Embodied Water, L/kg 150
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16
12
Resilience: Unit (Modulus of Resilience), kJ/m3 620
370
Stiffness to Weight: Axial, points 9.6
14
Stiffness to Weight: Bending, points 14
18
Strength to Weight: Axial, points 14
13
Strength to Weight: Bending, points 12
13
Thermal Shock Resistance, points 46
18

Alloy Composition

Carbon (C), % 0
0 to 0.030
Iron (Fe), % 0
0 to 0.010
Molybdenum (Mo), % 0
66.9 to 73
Nickel (Ni), % 0
0 to 0.0020
Nitrogen (N), % 0
0 to 0.0020
Oxygen (O), % 0
0 to 0.0025
Silicon (Si), % 0
0 to 0.010
Tungsten (W), % 97
27 to 33
Residuals, % 3.0
0