Wrought butt-weld fittings
ASTM A234 WP9 Cl.1 — chemistry & properties
ASTM A234 WP9 Cl.1 (Wrought butt-weld fittings, UNS K90941): chemical composition and mechanical properties. 9Cr-1Mo butt-weld fittings
Chemical composition (wt %)
| C | ≤ 0.15 |
| Mn | 0.3 – 0.6 |
| P | ≤ 0.03 |
| S | ≤ 0.03 |
| Si | ≤ 1 |
| Cr | 8 – 10 |
| Mo | 0.9 – 1.1 |
Mechanical properties
| Tensile strength, min | 415 MPa |
| Yield strength, min | 205 MPa |
| Elongation, min | 22 % |
| Hardness | 217 HBW max |