Pressure-vessel plate
ASTM A387 Grade 22 Cl.2 — chemistry & properties
ASTM A387 Grade 22 Cl.2 (Pressure-vessel plate, UNS K21590): chemical composition and mechanical properties. Hydroprocessing reactors and high-temperature vessels
Chemical composition (wt %)
| C | 0.05 – 0.15 |
| Mn | 0.3 – 0.6 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
| Si | ≤ 0.5 |
| Cr | 2 – 2.5 |
| Mo | 0.9 – 1.1 |
Mechanical properties
| Tensile strength, min | 515 MPa |
| Yield strength, min | 310 MPa |
| Elongation, min | 18 % |
| Hardness | Not specified |