Wrought butt-weld fittings
ASTM A234 WP11 Cl.3 — chemistry & properties
ASTM A234 WP11 Cl.3 (Wrought butt-weld fittings, UNS K11572): chemical composition and mechanical properties. Highest-strength 1¼Cr-½Mo butt-weld fittings
Chemical composition (wt %)
| C | 0.05 – 0.2 |
| Mn | 0.3 – 0.8 |
| P | ≤ 0.04 |
| S | ≤ 0.04 |
| Si | 0.5 – 1 |
| Cr | 1 – 1.5 |
| Mo | 0.44 – 0.65 |
Mechanical properties
| Tensile strength, min | 520 MPa |
| Yield strength, min | 310 MPa |
| Elongation, min | 22 % |
| Hardness | 197 HBW max |