Forged flanges & fittings
ASTM A350 LF3 Cl.1 — chemistry & properties
ASTM A350 LF3 Cl.1 (Forged flanges & fittings, UNS K32025): chemical composition and mechanical properties. 3.5 % nickel steel for −101 °C service — ethylene, LPG
Chemical composition (wt %)
| C | ≤ 0.2 |
| Mn | ≤ 0.9 |
| P | ≤ 0.035 |
| S | ≤ 0.04 |
| Si | 0.2 – 0.35 |
| Cr | ≤ 0.3 |
| Ni | 3.3 – 3.7 |
| Mo | ≤ 0.12 |
| Cu | ≤ 0.4 |
Mechanical properties
| Tensile strength, min | 485 MPa |
| Yield strength, min | 260 MPa |
| Elongation, min | 22 % |
| Hardness | 197 HBW max |
| Impact test | −101 °C (20 J avg) |