Calculator Input
Example Data Table
| Material | Condition | HV | HB | HRC | Estimated MPa |
|---|---|---|---|---|---|
| Low carbon steel | Annealed | 130 | 124 | 0 | 428 |
| Medium carbon steel | Normalized | 220 | 209 | 0 | 721 |
| Tool steel | Hardened | 650 | 618 | 34 | 2132 |
| Aluminum alloy | Heat treated | 110 | 105 | 0 | 361 |
Formula Used
This tool uses Vickers hardness as the central reference value. Other values are estimated from that base value.
- HB estimate: HB = HV × 0.95
- HRB estimate: HRB = 130 - 2750 / HV
- HRC estimate: HRC = 0.091 × HV - 25
- Shore estimate: HS = 0.102 × HV
- Tensile strength: MPa = 3.45 × HB
- PSI: PSI = MPa × 145.0377
These equations are practical estimates. Real hardness conversion can vary by alloy, heat treatment, grain structure, and testing method.
How to Use This Calculator
- Enter a sample ID for easy reporting.
- Add the material name and condition.
- Select the hardness scale you already know.
- Enter the measured hardness value.
- Add load, dwell time, temperature, and surface details.
- Press the convert button to view results above the form.
- Use CSV or PDF export for records.
Hardness Conversion Guide
Why Hardness Conversion Matters
Hardness values help engineers compare metals, coatings, welds, and heat treated parts. A shop may record Brinell data, while a drawing asks for Rockwell values. A laboratory may report Vickers results, while a buyer needs tensile strength. This calculator creates a fast reference between common scales. It saves time during checks, reviews, and early material planning.
Useful for Material Review
The tool supports Vickers, Brinell, Rockwell B, Rockwell C, Shore, MPa, and PSI estimates. It also stores material condition, surface finish, test load, dwell time, and temperature. These details matter because hardness is not only a number. Surface preparation can change readings. Thin coatings can distort results. Heat treatment can also shift conversion behavior.
Understanding the Result
The result section appears above the form after submission. This keeps the converted values visible while you adjust inputs. Each output is calculated through a Vickers reference model. This approach gives a consistent conversion path. It is useful when comparing several scales at once. The tensile strength value is an estimate, not a certified value. It should support screening and planning. It should not replace a controlled laboratory test.
Good Testing Practice
Always match the test method to the material. Use Rockwell C for harder steels. Use Rockwell B for softer metals. Use Brinell for castings and rougher structures. Use Vickers when small impressions or thin sections are required. Clean the surface before testing. Avoid edges, weld defects, and curved locations. Take several readings and compare the average.
Export and Reporting
The export buttons help document calculations. CSV files are useful for spreadsheets. PDF files are useful for inspection records. The example table gives quick reference values. You can compare your converted result with typical material ranges. For final approval, always follow the required material standard. Use this calculator as a practical conversion assistant. Confirm critical values with approved test equipment.
FAQs
What is hardness conversion?
Hardness conversion estimates one hardness scale from another. It helps compare test results when different equipment or drawing requirements use different scales.
Is the conversion exact?
No. Hardness conversion is approximate. Alloy type, heat treatment, surface finish, and testing method can change the relationship between scales.
Which scale is best for hard steel?
Rockwell C is commonly used for hard steel. Vickers is also useful when precise impressions or smaller samples are required.
Which scale is best for softer metals?
Rockwell B and Brinell are often used for softer metals. Aluminum, brass, copper, and mild steel may fit these ranges better.
Can this estimate tensile strength?
Yes. The calculator estimates tensile strength from Brinell hardness. It is useful for screening, but certified tensile testing is still required for approval.
Why does surface finish matter?
Rough, scaled, or curved surfaces can affect indentation depth. A clean and prepared surface gives more reliable hardness readings.
Can I use this for coatings?
You can use it for rough estimates. Thin coatings may need microhardness testing because the base material can influence the reading.
Does temperature affect hardness?
Temperature can affect some materials and test conditions. Record it when comparing results or creating inspection reports.