Hardness to Tensile Strength Estimator
UTS and approximate yield from hardness — by material family.
Hardness IS resistance to plastic flow, so the correlation is physical, not coincidence. It breaks for work-hardened austenitics and gray cast iron — graphite lies to the indenter.
Formula
Note: Estimation only — never accept material against spec on converted hardness alone.
Hardness to Tensile Strength Estimator is a free hardness to tensile for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Hardness to Tensile Strength Estimator
UTS and approximate yield from hardness — by material family. The calculation implements UTS ≈ k·HB (k = 3.3–3.8 by family) (ASM Handbook correlations; Tabor's relation). Hardness IS resistance to plastic flow, so the correlation is physical, not coincidence. It breaks for work-hardened austenitics and gray cast iron — graphite lies to the indenter.
How to use Hardness to Tensile Strength Estimator
- 1Enter Brinell hardness.
- 2Enter Material family (1 carbon steel (3.45) · 2 alloy steel Q&T (3.3) · 3 aluminium alloys (~3.8 vs HB)).
- 3Read Estimated UTS, Rough yield (0.75×UTS) instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Hardness to Tensile Strength Estimator?
- ✓Implements the standard formula — UTS ≈ k·HB (k = 3.3–3.8 by family)
- ✓Reference cited on-page: ASM Handbook correlations; Tabor's relation
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Hardness to Tensile Strength Estimator use?+
It computes UTS ≈ k·HB (k = 3.3–3.8 by family), per ASM Handbook correlations; Tabor's relation. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Hardness IS resistance to plastic flow, so the correlation is physical, not coincidence. It breaks for work-hardened austenitics and gray cast iron — graphite lies to the indenter. Note: Estimation only — never accept material against spec on converted hardness alone.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Hardness to Tensile Strength Estimator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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