Alloy steel F11 Cl 2 vs Alloy steel F22 Cl 3
Alloy steel F11 Cl 2 (UNS K11572) vs Alloy steel F22 Cl 3 (UNS K21590): chemical composition and mechanical properties side by side.
- Strength: Alloy steel F22 Cl 3 minimum yield is 310 MPa vs 275 MPa for Alloy steel F11 Cl 2 (+13%); tensile 515 vs 485 MPa.
- Density: 7.85 vs 7.85 g/cm³ — same weight for the same dimensions.
- Typical use: Alloy steel F11 Cl 2 — 1¼Cr-½Mo. Alloy steel F22 Cl 3 — 2¼Cr-1Mo.
| Property | Alloy steel F11 Cl 2 | Alloy steel F22 Cl 3 |
|---|---|---|
| Family | Alloy steel | Alloy steel |
| UNS | K11572 | K21590 |
| EN / W.Nr | – – | 1.7380 10CrMo9-10 |
| Basis spec | ASTM A182 | ASTM A182 |
| Density g/cm³ | 7.85 | 7.85 |
| Chemical composition, % | ||
| C | 0.10–0.20 | 0.05–0.15 |
| Mn | 0.30–0.80 | 0.30–0.60 |
| P | 0.040 | 0.040 |
| S | 0.040 | 0.040 |
| Si | 0.50–1.00 | 0.50 |
| Cr | 1.00–1.50 | 2.00–2.50 |
| Mo | 0.44–0.65 | 0.87–1.13 |
| Mechanical properties (min) | ||
| Tensile strength | 485 MPa (70 ksi) | 515 MPa (75 ksi) |
| Yield strength (0.2%) | 275 MPa (40 ksi) | 310 MPa (45 ksi) |
| Elongation | 20% | 20% |
| Hardness (max) | 207 HB | 207 HB |
| PREN (min, from spec) | – | – |
Single values are maximums; ranges are min–max; "bal" = balance. Limits are typical of the basis specification for that product form — forgings, pipe and fittings specifications differ slightly. Always check the exact specification, edition and the mill test certificate.
Frequently asked questions
What is the difference between Alloy steel F11 Cl 2 and Alloy steel F22 Cl 3?
Strength: Alloy steel F22 Cl 3 minimum yield is 310 MPa vs 275 MPa for Alloy steel F11 Cl 2 (+13%); tensile 515 vs 485 MPa. Density: 7.85 vs 7.85 g/cm³ — same weight for the same dimensions. Typical use: Alloy steel F11 Cl 2 — 1¼Cr-½Mo. Alloy steel F22 Cl 3 — 2¼Cr-1Mo.
Which is stronger, Alloy steel F11 Cl 2 or Alloy steel F22 Cl 3?
Alloy steel F22 Cl 3 has the higher minimum yield strength (310 MPa vs 275 MPa).
Last updated 2026-11-02