Hardness Conversion Calculator — Formula
## Hardness to Strength Conversion
For carbon and alloy steels, Brinell hardness (HB) correlates approximately with ultimate tensile strength.
### Empirical Relationship
**UTS (MPa) ≈ 3.45 × HB**
This approximation is valid for steels in the range HB 120-450. For non-ferrous metals or very high-strength steels, the conversion factor differs. The Rockwell B approximation is a rough linear mapping useful for quick estimates.
For carbon and alloy steels, Brinell hardness (HB) correlates approximately with ultimate tensile strength.
### Empirical Relationship
**UTS (MPa) ≈ 3.45 × HB**
This approximation is valid for steels in the range HB 120-450. For non-ferrous metals or very high-strength steels, the conversion factor differs. The Rockwell B approximation is a rough linear mapping useful for quick estimates.
Esempio Risolto
A steel part has a measured Brinell hardness of 200 HB.
- UTS ≈ 3.45 × 200 = 690 MPa
- In ksi: 690 × 0.145 = 100.1 ksi
- Approx. HRB = (200 - 49) / 2.8 + 35 = 53.9 + 35 = 88.9