Class 4 Tungsten
Class 4 tungsten is a tungsten alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly low heat capacity among alloys in the same category. In addition, it has a fairly high tensile strength and a fairly high density.
The graph bars on the material properties cards below compare class 4 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
270 GPa 40 x 106 psi
Elongation at Break
2.3 %
Poisson's Ratio
0.28
Rockwell C Hardness
31
Shear Modulus
110 GPa 15 x 106 psi
Tensile Strength: Ultimate (UTS)
790 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
580 MPa 84 x 103 psi
Thermal Properties
Latent Heat of Fusion
170 J/g
Specific Heat Capacity
130 J/kg-K 0.030 BTU/lb-°F
Thermal Conductivity
30 W/m-K 17 BTU/h-ft-°F
Thermal Expansion
4.5 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
17 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.7 % IACS
Otherwise Unclassified Properties
Density
16 g/cm3 980 lb/ft3
Embodied Carbon
24 kg CO2/kg material
Embodied Energy
360 MJ/kg 160 x 103 BTU/lb
Embodied Water
150 L/kg 18 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
16 MJ/m3
Resilience: Unit (Modulus of Resilience)
620 kJ/m3
Stiffness to Weight: Axial
9.6 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
14 points
Strength to Weight: Bending
12 points
Thermal Diffusivity
15 mm2/s
Thermal Shock Resistance
46 points
Alloy Composition
| W | 97 to 97 | |
| res. | 3.0 to 3.0 |
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