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Class 3 Tungsten vs. Class 2 Tungsten

Both class 3 tungsten and class 2 tungsten are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is class 3 tungsten and the bottom bar is class 2 tungsten.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 270
260
Elongation at Break, % 3.4
5.7
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 30
29
Shear Modulus, GPa 100
100
Tensile Strength: Ultimate (UTS), MPa 830
860
Tensile Strength: Yield (Proof), MPa 580
580

Thermal Properties

Latent Heat of Fusion, J/g 170
160
Specific Heat Capacity, J/kg-K 120
120
Thermal Conductivity, W/m-K 30
20
Thermal Expansion, µm/m-K 4.5
4.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 15
13
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
7.8

Otherwise Unclassified Properties

Density, g/cm3 15
15
Embodied Carbon, kg CO2/kg material 23
23
Embodied Energy, MJ/kg 360
350
Embodied Water, L/kg 150
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 25
44
Resilience: Unit (Modulus of Resilience), kJ/m3 630
640
Stiffness to Weight: Axial, points 9.6
9.6
Stiffness to Weight: Bending, points 14
14
Strength to Weight: Axial, points 15
16
Strength to Weight: Bending, points 13
13
Thermal Diffusivity, mm2/s 15
11
Thermal Shock Resistance, points 49
52

Alloy Composition

Tungsten (W), % 95
92.5
Residuals, % 0
7.5