Technical Data Sheet
Alloy 800 – The 800 series of alloy (Incoloy 800, 800H and 800HT) are nickel-iron-chromium superalloys that have excellent properties of high temperature strength and resistance to oxidation, carburization and other types of high temperature corrosion. Alloy 800, 800H and 800HT are used in various applications from furnace components, petrochemical furnace cracker tubes to sheathing for electrical heating elements.
| Chemical Composition Limits | |||||||
| Weight % | Ni | Cr | Fe | C | Al | Ti | Al+Ti |
| Alloy 800 | 30-35 | 19-23 | 39.5 min | 0.10 max | 0.15-0.60 | 0.15-0.60 | 0.30-1.20 |
| Alloy 800H | 30-35 | 19-23 | 39.5 | 0.05-0.10 | 0.15-0.60 | 0.15-0.60 | 0.30-1.20 |
| Alloy 800HT | 30-35 | 19-23 | 39.5 | 0.06-0.10 | 0.25-0.60 | 0.25-0.60 | 0.85-1.20 |
| ASTM Grain Size – Alloy 800 is not specified, Alloy 800H is 5 or coarser, Alloy 800HT is 5 or coarser. | |||||||
Typical Mechanical Properties
| Material | Temp | Hardnes BHN | Tensile Strength MPa | Yield Strength (0.2% Offset) | |||
| °F | °C | ksi | MPa | ksi | MPa | ||
| Alloy 800H and Alloy 800HT | 80 | 27 | 126 | 77.8 | 536 | 21.7 | 150 |
| Alloy 800H and Alloy 800HT | 800 | 425 | 67.5 | 465 | 18.8 | 130 | |
| Alloy 800H and Alloy 800HT | 1000 | 540 | 90 | 62.7 | 432 | 13.0 | 90 |
| Alloy 800H and Alloy 800HT | 1200 | 650 | 84 | 54.8 | 378 | 13.5 | 93 |
| Alloy 800H and Alloy 800HT | 1300 | 705 | 82 | 47.7 | 329 | 15.8 | 109 |
| Alloy 800H and Alloy 800HT | 1400 | 760 | 74 | 34.2 | 236 | 13.1 | 90 |
| Alloy 800HT is a Trademark of Special Metals Corporation | |||||||
