High-Temperature Service
Used in selected process and heating equipment exposed to elevated temperatures.
INCOLOY® · Product Details
INCOLOY® Alloy 800 / 800H
Nickel–Iron–Chromium Alloys · High-Temperature Service
INCOLOY® alloy 800 and alloy 800H are related nickel-iron-chromium alloys used in selected high-temperature and corrosive environments. Alloy 800 is valued for heat resistance, oxidation and carburization resistance, while 800H uses controlled carbon and grain-size requirements to provide improved creep and rupture strength. The designations are related but not interchangeable.
Ni–Fe–CrAlloy system
7.94 g/cm³Reference density
1357–1385 °CReference melting range
Key Performance Characteristics
UNS N08800 / N08810
Oxidation & Carburization Resistance
The alloy family is designed to resist oxidation, carburization and other forms of high-temperature corrosion.
Creep & Rupture Strength
INCOLOY® 800H is distinguished by controlled carbon and grain-size requirements that improve creep and rupture performance compared with alloy 800.
Fabrication
Alloy 800 can be formed, welded and machined using established procedures selected for the product form and application.
Typical Application Areas
Industrial Furnaces
Selected furnace components, heat-treating baskets, trays and fixtures.
Petrochemical Processing
Selected cracker tubes, pigtails, headers and high-temperature process piping.
Heat Exchangers
Selected heat exchangers and process systems requiring heat and corrosion resistance.
Power Generation
Selected steam-superheater tubing and other high-temperature equipment.
Chemical Composition
Limiting composition, % — grade comparison
| Element | Alloy 800 | Alloy 800H |
|---|---|---|
| Nickel | 30.0–35.0 | 30.0–35.0 |
| Chromium | 19.0–23.0 | 19.0–23.0 |
| Iron | 39.5 min. | 39.5 min. |
| Carbon | 0.10 max. | 0.05–0.10 |
| Aluminum | 0.15–0.60 | 0.15–0.60 |
| Titanium | 0.15–0.60 | 0.15–0.60 |
| Aluminum + Titanium | 0.30–1.20 | 0.30–1.20 |
| ASTM grain size | Not specified | 5 or coarser |
Physical Properties
Published reference values
| Property | Reference value |
|---|---|
| Density — alloy 800 reference | 7.94 g/cm³ |
| Melting range — alloy 800 reference | 1357–1385 °C |
| Specific heat — alloy 800 reference | 460 J/(kg·°C) |
Mechanical Properties
Reference data by form and condition
| Grade | Mechanical distinction | Selection point |
|---|---|---|
| INCOLOY® 800 | General heat-resistant alloy with useful high-temperature strength. | Specify the required form, condition and governing standard. |
| INCOLOY® 800H | Controlled carbon range and ASTM grain-size requirement; higher creep and rupture strength than alloy 800. | Do not substitute 800 and 800H without matching the purchase specification. |
The figures above describe alloy-family distinctions rather than universal tensile minimums. The specific grade, product form, heat treatment and applicable specification determine acceptance values.
Discuss Your INCOLOY® Alloy 800 / 800H Requirements
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