Alloy steel castings
ASTM A217 C12 — chemistry & properties
ASTM A217 C12 (Alloy steel castings, UNS J82090): chemical composition and mechanical properties. 9Cr-1Mo valve bodies
Chemical composition (wt %)
| C | ≤ 0.2 |
| Mn | 0.35 – 0.65 |
| P | ≤ 0.035 |
| S | ≤ 0.035 |
| Si | ≤ 1 |
| Cr | 8 – 10 |
| Mo | 0.9 – 1.2 |
Mechanical properties
| Tensile strength, min | 620 MPa |
| Yield strength, min | 415 MPa |
| Elongation, min | 18 % |
| Hardness | Not specified |