# 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 10 ^{6} psi*

Elongation at Break

2.3 *%*

Poisson's Ratio

0.28

Rockwell C Hardness

31

Shear Modulus

110 *GPa* 15 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

790 *MPa* 110 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

580 *MPa* 84 *x 10 ^{3} 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/cm ^{3}* 980

*lb/ft*

^{3}Embodied Carbon

24 *kg CO _{2}/kg material*

Embodied Energy

360 *MJ/kg* 160 *x 10 ^{3} BTU/lb*

Embodied Water

150 *L/kg* 18 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

16 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

620 *kJ/m ^{3}*

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 *mm ^{2}/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