Forged flanges & fittings
ASTM A182 F44 (254 SMO) — chemistry & properties
ASTM A182 F44 (254 SMO) (Forged flanges & fittings, UNS S31254): chemical composition and mechanical properties. Seawater, desalination, offshore firewater and bleach-plant service
Chemical composition (wt %)
| C | ≤ 0.02 |
| Mn | ≤ 1 |
| P | ≤ 0.03 |
| S | ≤ 0.01 |
| Si | ≤ 0.8 |
| Cr | 19.5 – 20.5 |
| Ni | 17.5 – 18.5 |
| Mo | 6 – 6.5 |
| Cu | 0.5 – 1 |
| N | 0.18 – 0.25 |
Mechanical properties
| Tensile strength, min | 650 MPa |
| Yield strength, min | 300 MPa |
| Elongation, min | 35 % |
| Hardness | Not specified |