Super duplex steel castings
ASTM A995 Grade 6A (CD3MWCuN) — chemistry & properties
ASTM A995 Grade 6A (CD3MWCuN) (Super duplex steel castings, UNS J93380): chemical composition and mechanical properties. Cast super duplex for seawater valves
Chemical composition (wt %)
| C | ≤ 0.03 |
| Mn | ≤ 1 |
| P | ≤ 0.03 |
| S | ≤ 0.025 |
| Si | ≤ 1 |
| Cr | 24 – 26 |
| Ni | 6.5 – 8.5 |
| Mo | 3 – 4 |
| Cu | 0.5 – 1 |
| N | 0.2 – 0.3 |
Mechanical properties
| Tensile strength, min | 690 MPa |
| Yield strength, min | 450 MPa |
| Elongation, min | 25 % |
| Hardness | Not specified |