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Hardness Converter – Vickers, Brinell, Rockwell C

Quick answer

This calculator converts metal hardness scales: HV, HB and HRC, plus an approximate tensile strength σ ≈ 3.55 × HV^0.935 MPa.

  • Free hardness converter.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How the Hardness Converter Works

HV ↔ HB ↔ HRC conversion · σ ≈ 3.55 × HV^0.935 MPa

The converter moves your value between the three common indentation scales — Vickers (HV), Brinell (HB) and Rockwell C (HRC) — using empirical cross-scale factors, then estimates tensile strength from Vickers numbers via σ ≈ 3.55 × HV^0.935 MPa. Treat all outputs as approximations: the scales measure different indenter geometries, and real steels scatter a few percent around any conversion. Always confirm critical values with the mill certificate.

  1. 1

    Step 1

    Enter the hardness value

  2. 2

    Step 2

    Type the source scale code (1=HV, 2=HB, 3=HRC)

  3. 3

    Step 3

    Type the target scale code

  4. 4

    Step 4

    Read the converted hardness and the tensile-strength estimate

Use Cases

Cross-checking mill test certificates

Comparing fastener hardness specs across standards

Estimating steel strength from bench hardness tests

FAQs

Can HV be converted exactly to HRC?

No exact conversion exists — the scales use different indenters and loads. Cross-scale tables agree only within a few percent, which is what this converter reproduces.

How is tensile strength estimated?

From the Vickers number: σ ≈ 3.55 × HV^0.935 MPa. An HV of 300 suggests roughly 950 MPa, typical for quenched-and-tempered steel.

Which scale suits hard coatings?

Vickers (HV), because its diamond pyramid works across thin, hard layers where Rockwell's larger indenter would punch through.

Is HB good for soft metals?

Yes — Brinell's large ball gives stable readings on soft aluminium and copper alloys, roughly HB 15–150.

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