Rockwell C to Brinell
Type a value in HRC to get it in HB instantly.
371HB
That's 1.96× as hard as 304 stainless steel, while spring steel is 1.14× harder.
Convert the other way: HB to HRC
What it means
How hard is that?
For carbon and alloy steels (ASTM E140). Conversions between scales are approximate; for other metals and for exact values, test on the scale you need.
The math
How to convert HRC to HB
Hardness scales convert by table (ASTM E140): HRC 50 = 513 HV = 481 HB, HRC 40 = 392 HV = 371 HB. Tensile strength ≈ 3.45 × HB MPa.
Example: 40 HRC = 371 HB.
Every unit
That hardness on every scale
Tables
HRC to HB conversion table
| HRC | HB |
|---|---|
| 20 HRC | 226 HB |
| 25 HRC | 253 HB |
| 30 HRC | 286 HB |
| 35 HRC | 327 HB |
| 40 HRC | 371 HB |
| 45 HRC | 421 HB |
| 50 HRC | 481 HB |
| 55 HRC | 560 HB |
HB to HRC conversion table
| HB | HRC |
|---|---|
| 226 HB | 20 HRC |
| 253 HB | 25 HRC |
| 286 HB | 30 HRC |
| 327 HB | 35 HRC |
| 371 HB | 40 HRC |
| 421 HB | 45 HRC |
| 481 HB | 50 HRC |
| 560 HB | 55 HRC |
Quick answers
Quick answers
- How many HB is 40 HRC?
- 40 HRC is 371 HB.
The units
About these units
Rockwell C (HRC)
Rockwell C: depth under a diamond cone, for hardened steel (20–68).
Brinell (HB)
Brinell: load over the area of a 10 mm ball dent (tungsten-carbide ball).
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