Rockwell B to Brinell
Type a value in HRB to get it in HB instantly.
110.4HB
That's 1.08× as hard as 6061-T6 aluminium, while mild steel is 1.21× harder.
Convert the other way: HB to HRB
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 HRB 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: 65 HRB = 110.4 HB.
Every unit
That hardness on every scale
Tables
HRB to HB conversion table
| HRB | HB |
|---|---|
| 60 HRB | 101.7 HB |
| 62 HRB | 105.2 HB |
| 65 HRB | 110.4 HB |
| 68 HRB | 115.5 HB |
HB to HRB conversion table
| HB | HRB |
|---|---|
| 102 HB | 60.2 HRB |
| 105 HB | 61.9 HRB |
| 110 HB | 64.8 HRB |
| 116 HB | 68.3 HRB |
Quick answers
Quick answers
- How many HB is 65 HRB?
- 65 HRB is 110.4 HB.
The units
About these units
Rockwell B (HRB)
Rockwell B: depth under a 1/16" ball, for softer steel (60–100).
Brinell (HB)
Brinell: load over the area of a 10 mm ball dent (tungsten-carbide ball).
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