Interactive converter
Input scale
20.3 – 80
Equivalent values
HRBRockwell B
—
Range: 41 – 99.5
HVVickers
—
Range: 85 – 1865
HB
Brinell—
Range: 81 – 745
UTSApprox. tensile
—
Available: HRC 20.3 – 59.2
Based on correlation tables from ASM International (Metals Handbook, 9th ed., 1987) and ASTM E140. Verified against a second independent source.
Scale guide
HRC20.3 – 80 HRC
Hardened steels and cutting tools. The most common scale in CNC machining.
HRB41 – 99.5 HRB
Annealed steels, aluminum, brass — low to medium hardness materials.
HV85 – 1865 HV
Universal range. Internal reference axis for all conversions.
HB81 – 745 HB
Cast and forged parts. Above HRC 47.7 a carbide ball (WC) is required.
UTSMPa / ksi
Empirical approximation (±5%). Does not replace a mechanical tensile test.
Model limitations
- Valid only for non-austenitic steels (carbon, alloy, tool steel). Not applicable to austenitic stainless, aluminum or other non-ferrous metals.
- Linear interpolation error < 1% in dense-point zones and up to ~3% in sparse zones (HRC 68-80).
- UTS only available where the reference table publishes correlation; outside that range the field shows '—'.
- HB values with WC ball (HV ≥ 480) are not equivalent to those measured with a standard steel ball.