Rockwell C to tensile strength in ksi (approx.)
Type a value in HRC to get it in ksi instantly.
185.6ksi
That's 1.96× as hard as 304 stainless steel, while spring steel is 1.14× harder.
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 ksi
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 = 185.641 ksi.
Every unit
That hardness on every scale
Tables
HRC to ksi conversion table
| HRC | ksi |
|---|---|
| 20 HRC | 113.086 ksi |
| 25 HRC | 126.596 ksi |
| 30 HRC | 143.109 ksi |
| 35 HRC | 163.624 ksi |
| 40 HRC | 185.641 ksi |
| 45 HRC | 210.66 ksi |
| 50 HRC | 240.683 ksi |
| 55 HRC | 280.213 ksi |
ksi to HRC conversion table
| ksi | HRC |
|---|---|
| 127 ksi | 25.1 HRC |
| 143 ksi | 30 HRC |
| 164 ksi | 35.1 HRC |
| 186 ksi | 40.1 HRC |
| 211 ksi | 45.1 HRC |
| 241 ksi | 50 HRC |
| 280 ksi | 55 HRC |
Quick answers
Quick answers
- How many ksi is 40 HRC?
- 40 HRC is 185.641 ksi.
The units
About these units
Rockwell C (HRC)
Rockwell C: depth under a diamond cone, for hardened steel (20–68).
Tensile strength in ksi (approx.) (ksi)
Estimated ultimate tensile strength of steel, in thousands of psi.
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