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Incoloy 800 | UNS N08800 | WNR 1.4876 Material
Incoloy alloy 800 is based on a nickel-chromium-iron base metal with additions such as molybdenum, copper, nitrogen and silicon. UNS N08800 material has excellent high temperature strength up to 1,200°F (650°C) and is highly resistant to oxidizing, reducing and aqueous environments. Available standard forms of this nickel alloy 800 include round bar, pipe, plate, sheet, wire and strip, fittings, flanges and more.
Incoloy Alloy 800 UNS N08800 (1.4876) Available Forms
- ASTM B409 Plates and Sheets
- ASTM B408 Bars and Rods
- ASTM B407 UNS N08800 Seamless Pipe and Tubes
- ASTM B564 Flanges
- ASTM B366 Butt Weld Fittings: Elbows Tees Crosses Caps Reducers Lap Joint Stub Ends Long Radius Bend Returns
- ASTM B564 Forged Fittings: Elbows Tees Crosses Couplings Caps Unions Nipples Bushings Plugs Outlet fittings
Incoloy 800 Chemical Composition Matrix
| Element Symbol | Element Name | Chemical Composition Percentage (%) |
| Ni | Nickel | 30.00 – 35.00 |
| Cr | Chromium | 19.00 – 23.00 |
| Fe | Iron | 39.50 minimum (Balance) |
| C | Carbon | ≤ 0.10 |
| Al | Aluminum | 0.15 – 0.60 |
| Ti | Titanium | 0.15 – 0.60 |
| Al + Ti | Combined Total | 0.30 – 1.20 |
Mechanical & Physical Properties
Tensile Strength (Minimum): 520 MPa (75,000 psi)
Yield Strength (0.2% Offset): 205 MPa (30,000 psi)
Elongation Capacity: ≥ 30%
Density Profile: 7.94 g/cm³ (0.287 lb/in³)
Melting Range Limit: 1357°C – 1385°C (2475°F – 2525°F)
High Temperature Resistance:
Incoloy 800 is stable in temperatures up to 1,200°F (650°C).
Corrosion Resistance:
Resists general corrosion, and the chromium gives it excellent oxidation resistance, even in sulfur-containing environments.
Applications of Incoloy 800
- Heat exchangers
- Furnace components
- Boilers and pressure vessels
- Nuclear power plants
- Chemical processing
Hot Working
Nickel 800 alloy can be hot worked in the temperature range of 871-1232°C (1600-2250°F).
Fabrication, Welding, and Heat Treatment
Machining Properties: Alloy 800 work-hardens at a rapid rate. Machining requires low cutting speeds, heavy industrial feeds, sharp tungsten-carbide tools, and an uninterrupted flow of sulfur-free lubricants.
Welding Techniques: Easily weldable using standard Gas Tungsten Arc Welding (GTAW/TIG) or Gas Metal Arc Welding (GMAW/MIG) methods. For standard operations, matching chemistry filler wire like Inconel Filler Metal 82 or Incoloy Filler Metal 65 is highly recommended.
Annealing Protocol: Standard solution annealing is conducted within a thermal field of 980°C to 1150°C (1800°F to 2100°F) followed by rapid air cooling or water quenching to achieve optimum grain refinement.
Core Industrial Applications of Alloy 800
Petrochemical Refining: Process piping systems, heat exchangers, cracking tubes, and pigtails.
Power Generation: Superheater and reheater tubing in conventional and nuclear power plants.
Industrial Thermal Processing: Muffles, retorts, heating-element sheathing, and furnace fixtures.
Chemical Production: Production equipment handling aggressive organic and inorganic acids.
