Forged flanges & fittings
ASTM A182 F5a — chemistry & properties
ASTM A182 F5a (Forged flanges & fittings, UNS K42544): chemical composition and mechanical properties. Higher-strength 5Cr-½Mo forgings for refinery service
Chemical composition (wt %)
| C | ≤ 0.25 |
| Mn | ≤ 0.6 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
| Si | ≤ 0.5 |
| Cr | 4 – 6 |
| Ni | ≤ 0.5 |
| Mo | 0.44 – 0.65 |
Mechanical properties
| Tensile strength, min | 620 MPa |
| Yield strength, min | 450 MPa |
| Elongation, min | 22 % |
| Hardness | 187–248 HBW |