Tungsten heavy alloys exist for one dominant reason: density. At roughly twice the density of steel, they pack mass into a small envelope where steel simply cannot.
| Property | Tungsten heavy alloy | Steel (1018) |
|---|---|---|
| Density | ~17–18.5 g/cm³ | ~7.85 g/cm³ |
| Mass per volume | ~2.2× steel | baseline |
| Hardness / wear | High | Moderate |
| Machinability | Difficult (abrasive, tough) | Easy |
| Typical use | Counterweights, radiation shielding, ballast, vibration damping | General structural parts |