Nickel alloy forgings, fittings & pipe
Alloy 800 / 800H / 800HT — chemistry & properties
Alloy 800 / 800H / 800HT (Nickel alloy forgings, fittings & pipe, UNS N08800 / N08810 / N08811): chemical composition and mechanical properties. Reformer and cracker piping, heat exchangers, high-temperature service
Chemical composition (wt %)
| C | 0.10 max (800), 0.05–0.10 (800H), 0.06–0.10 (800HT) |
| Mn | ≤ 1.5 |
| S | ≤ 0.015 |
| Si | ≤ 1 |
| Cr | 19 – 23 |
| Ni | 30 – 35 |
| Cu | ≤ 0.75 |
| Ti | 0.15 – 0.6 |
| Al | 0.15 – 0.6 |
| Fe | ≥39.5 |
| Al+Ti | 0.85–1.20 (800HT) |
Mechanical properties
| Tensile strength, min | 517 MPa |
| Yield strength, min | 207 MPa |
| Elongation, min | 30 % |
| Hardness | Not specified |