Class 1 Tungsten
Class 1 tungsten is a tungsten alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a very low heat capacity among alloys in the same category. In addition, it has a very high tensile strength and a fairly high density.
The graph bars on the material properties cards below compare class 1 tungsten to: tungsten 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
250 GPa 37 x 106 psi
Elongation at Break
5.7 %
Poisson's Ratio
0.29
Rockwell C Hardness
28
Shear Modulus
98 GPa 14 x 106 psi
Tensile Strength: Ultimate (UTS)
860 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
580 MPa 84 x 103 psi
Thermal Properties
Latent Heat of Fusion
160 J/g
Specific Heat Capacity
120 J/kg-K 0.028 BTU/lb-°F
Thermal Conductivity
21 W/m-K 12 BTU/h-ft-°F
Thermal Expansion
5.1 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
12 % IACS
Electrical Conductivity: Equal Weight (Specific)
7.4 % IACS
Otherwise Unclassified Properties
Density
15 g/cm3 910 lb/ft3
Embodied Carbon
22 kg CO2/kg material
Embodied Energy
340 MJ/kg 150 x 103 BTU/lb
Embodied Water
140 L/kg 17 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
44 MJ/m3
Resilience: Unit (Modulus of Resilience)
660 kJ/m3
Stiffness to Weight: Axial
9.6 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
14 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
48 points
Alloy Composition
| W | 90 to 90 | |
| res. | 10 to 10 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B777: Standard Specification for Tungsten Base, High-Density Metal
Tungsten: Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds, Erik Lassner and Wolf-Dieter Schubert, 1999