Calculator Form
Example Data Table
| Example | Input | Typical Output | Use Case |
|---|---|---|---|
| Medium shaft steel | 30 HRC | About 320 HV and 304 HB | Machined component review |
| Soft plate stock | 180 HB | About 189 HV and 93 HRB | Incoming material check |
| Hardened tool surface | 60 HRC | About 710 HV and 674 HB | Heat treatment verification |
| Shop report estimate | 1,200 MPa | Converted through estimated HB | Strength comparison |
Formula Used
The calculator uses a steel reference table and linear interpolation. When an input falls between two known table points, the equivalent value is estimated as:
Converted value = y1 + (x - x1) × (y2 - y1) ÷ (x2 - x1)
Here, x is the entered hardness. The values x1 and x2 are the nearest known table values. The values y1 and y2 are their matching equivalents. Tensile strength is estimated with:
UTS MPa = Brinell hardness × tensile multiplier
The default multiplier is 3.45 MPa per HB. Change it when your material specification provides a better factor.
How to Use This Calculator
- Enter the measured hardness value from your report or test machine.
- Select the source scale, such as HRC, HRB, HB, HV, HS, or MPa.
- Choose the steel family for clearer reporting notes.
- Adjust the tensile multiplier when your standard requires it.
- Set uncertainty and decimal places for the final table.
- Press calculate, then review results above the form.
- Download the CSV or PDF file for documentation.
Steel Hardness Conversion Guide
Why Steel Hardness Conversion Matters
Steel hardness conversion helps engineers compare results from different test methods. A supplier may report Rockwell C. A drawing may ask for Vickers. A maintenance record may list Brinell. This calculator links those values through a practical reference table. It gives fast estimates for reviews, quotations, inspection sheets, and heat treatment checks.
How the Table Works
The tool first converts the entered value to a Vickers baseline. Vickers is useful because it spans soft and hard steels. The baseline is then converted to Rockwell, Brinell, Shore, and tensile strength estimates. The calculator uses interpolation between nearby rows. This keeps the result smoother than a simple nearest row lookup. It also shows when a value is outside a preferred scale range.
Rockwell, Brinell, and Vickers
Rockwell C is common for hardened steel. Rockwell B is better for softer steel. Brinell is often used for plate, castings, and forgings. Vickers is common in laboratory reports and thin section studies. Each method uses a different indenter and load. That is why exact conversion is not guaranteed. The same steel can show small differences because of surface finish, section thickness, test load, grain structure, and heat treatment condition.
Tensile Strength Estimate
The tensile estimate uses Brinell hardness times a multiplier. The default value is 3.45 MPa per HB. It is a useful engineering approximation for many steels. It should not replace a real tensile test. Use the multiplier field when your steel grade, standard, or lab report gives a better relationship.
Best Practice
Use conversions for comparison and planning. Use direct testing for acceptance decisions. Always match the required standard, test method, load, and surface preparation. Record the original scale with every converted result. This makes the report clear and traceable.
FAQs
1. Is hardness conversion exact?
No. It is an estimate. Different hardness tests use different loads, indenters, and measurement methods. Steel grade and heat treatment also affect the relationship.
2. Which scale should I enter first?
Enter the scale shown on your test report. The calculator converts that value through a Vickers baseline and returns common steel equivalents.
3. Why are some HRC or HRB values marked not preferred?
Rockwell C suits harder steel. Rockwell B suits softer steel. Values outside those areas may be shown only as rough extrapolations.
4. Can this calculator replace lab testing?
No. It supports comparison and documentation. Acceptance work should follow the required material standard and direct test method.
5. What tensile multiplier should I use?
The default is 3.45 MPa per HB. Use another value when your material specification or testing procedure gives a better factor.
6. Does it work for stainless steel?
It can provide a useful estimate. Stainless grades may not follow the same relationship as carbon steel. Verify critical results with direct testing.
7. Why is Vickers used as the baseline?
Vickers covers a wide hardness range. It provides a convenient bridge between soft, medium, and very hard steel values.
8. What should I export for a report?
Export the CSV for spreadsheet records. Use the PDF for quick sharing. Keep the original measured value beside every conversion.