Machining
Hardness conversion
In short
HRC, HB, HV, HRB and tensile strength of steels, from ISO 18265. Example with the default values: Vickers HV = 392.
Calculation
Example calculated with the tool’s default values.
Inputs
- Measured scale
- Rockwell HRC
- Measured value
- 40
Results
- Vickers HV
- 392Table: 80 to 940
- Brinell HB
- 373Table: 76 to 618
- Tensile strength Rm
- 1262 MPaTable: 255 to 2180
Worked example
Every value in this section belongs to the example, calculated with the tool’s default values.
- Non-alloy, low-alloy and cast steels only: for austenitic stainless, cold-worked steels or non-ferrous metals, ISO 18265 warns of large deviations.
- Outside the table range for this value: HRB.
Step-by-step calculation
Interpolation
y = y0 + (y1 − y0) · (x − x0) / (x1 − x0), between two table rows
Rockwell HRC 40.0
ISO 18265 table (extract)
| HV | HB | HRC | Rm (MPa) | HRB |
|---|---|---|---|---|
| 350 | 333 | 35.50 | 1125 | — |
| 360 | 342 | 36.60 | 1155 | — |
| 370 | 352 | 37.70 | 1190 | — |
| 380 | 361 | 38.80 | 1220 | — |
| 390 | 371 | 39.80 | 1255 | — |
| 400 | 380 | 40.80 | 1290 | — |
| 410 | 390 | 41.80 | 1320 | — |
| 420 | 399 | 42.70 | 1350 | — |
| 430 | 409 | 43.60 | 1385 | — |
| 440 | 418 | 44.50 | 1420 | — |
| 450 | 428 | 45.30 | 1455 | — |
Limits
Indicative results: they replace neither the applicable standards nor the job drawings and instructions. Check the values entered and the result before doing the work.
Sources
Related tools
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