Free Hardness Conversion Calculator
Approximate conversion between Brinell hardness (HB) and ultimate tensile strength using the empirical relationship.
Approx. UTS (steel)
690 MPa
Approx. UTS (steel) vs Brinell Hardness (HB)
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.
Example Calculation
A steel part has a measured Brinell hardness of 200 HB.
- 01UTS ≈ 3.45 × 200 = 690 MPa
- 02In ksi: 690 × 0.145 = 100.1 ksi
- 03Approx. HRB = (200 - 49) / 2.8 + 35 = 53.9 + 35 = 88.9
Frequently Asked Questions
Learn More
Beam Stress Calculation Guide: From Theory to Practice
Learn how to calculate beam stress step by step. Covers bending stress, shear stress, the flexure formula, stress distributions, and practical design checks for structural beams.