Incoloy 800丨UNS N08800
Incoloy 800 is a nickel-iron-chromium alloy engineered for outstanding oxidation resistance, carburization resistance and long-term structural stability in elevated-temperature environments.
J&A Alloy supplies Incoloy 800 pipe, tube, plate, sheet, bar, wire, and forgings for petrochemical, heat treatment, power generation, and industrial furnace applications.
✔ Excellent oxidation resistance
✔ Outstanding carburization resistance
✔ Good high-temperature strength
✔ Excellent weldability and fabrication
Incoloy 800 Supplier & Manufacturer
Incoloy 800 (UNS N08800, W.Nr. 1.4876) is a nickel-iron-chromium alloy developed for applications requiring excellent resistance to oxidation, carburization and other high-temperature degradation mechanisms.
The balanced nickel content helps resist chloride stress corrosion cracking, while chromium provides oxidation resistance and iron improves structural stability and cost efficiency. Incoloy 800 is widely used in petrochemical processing, industrial furnaces, heat exchangers and power generation equipment.
Compared with Incoloy 800H and 800HT, standard Incoloy 800 is optimized for general corrosion and heat resistance rather than maximum creep strength.
J&A Alloy supplies Incoloy 800 products with complete traceability, PMI testing and EN 10204 3.1 certification.
Key Features of Incoloy 800
Excellent Oxidation Resistance
Maintains protective oxide scales during prolonged high-temperature exposure.
Outstanding Carburization Resistance
Performs well in carbon-rich furnace atmospheres.
Resistance to Chloride SCC
The high nickel content minimizes chloride stress corrosion cracking.
Good Mechanical Stability
Retains useful strength over a broad temperature range.
Excellent Fabricability
Can be readily formed, machined and welded.
Long Service Life
Designed for demanding thermal processing environments.
Chemical Composition of Incoloy 800
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | Balance |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 1.50 |
| Silicon (Si) | ≤ 1.00 |
| Copper (Cu) | ≤ 0.75 |
| Aluminum (Al) | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 |
| Sulfur (S) | ≤ 0.015 |
Mechanical Properties of Incoloy 800
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 500 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 90 HRB |
| Density | 7.94 g/cm³ |
| Melting Range | 1357 – 1385°C |
Corrosion Resistance
Incoloy 800 provides excellent resistance to:
- High-temperature oxidation
- Carburization
- Sulfidation
- Nitriding atmospheres
- Chloride stress corrosion cracking
- Organic acids
- Steam environments
Its combination of nickel and chromium makes it particularly suitable for thermal processing equipment.
High Temperature Performance
Typical Service Characteristics
- Excellent oxidation resistance up to approximately 1000°C
- Good structural stability
- Good thermal fatigue resistance
- Excellent resistance to scaling
- Reliable long-term service performance
Available Forms
J&A Alloy supplies Incoloy 800 in:
- Pipe
- Tube
- Plate
- Sheet
- Coil
- Strip
- Round Bar
- Rod
- Wire
- Flanges
- Fittings
- Forgings
Custom dimensions are available upon request.
Applications of Incoloy 800
Petrochemical Industry
- Cracking furnace tubing
- Process piping
- Steam reformers
Heat Treatment Equipment
- Furnace baskets
- Retorts
- Conveyor systems
Power Generation
- Heat exchangers
- Superheater tubing
Chemical Processing
- Pressure vessels
- Heater components
Industrial Furnaces
- Radiant tubes
- Thermal processing equipment
Incoloy 800 vs Incoloy 800H
| Property | Incoloy 800 | Incoloy 800H |
|---|---|---|
| UNS | N08800 | N08810 |
| Carbon Content | ≤0.10% | 0.05-0.10% |
| Creep Strength | Good | Superior |
| High Temperature Service | General | Long-term Elevated Service |
| Oxidation Resistance | Excellent | Excellent |
| Weldability | Excellent | Excellent |
| Main Applications | Heat Exchangers | Steam Reformers |
Welding & Fabrication
Incoloy 800 exhibits excellent fabrication characteristics.
Recommended Welding Processes
- GTAW (TIG)
- GMAW (MIG)
- SMAW
Fabrication Notes
- Excellent hot and cold forming properties
- Good machinability
- ERNiCr-3 filler metal is commonly recommended
Standards & Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N08800 |
| Werkstoff | 1.4876 |
| ASTM | B407 (Tube) |
| ASTM | B408 (Bar) |
| ASTM | B409 (Plate/Sheet) |
| ASME | SB407 / SB408 / SB409 |
| ISO | ISO 6208 |
| Common Trade Name | Incoloy 800 / Alloy 800 |
Frequently Asked Questions
What is Incoloy 800 used for?
Incoloy 800 is widely used in petrochemical processing, industrial furnaces, heat exchangers and power generation systems.
What is the difference between Incoloy 800 and 800H?
Incoloy 800H has controlled carbon content and improved creep rupture strength for elevated-temperature service.
Is Incoloy 800 weldable?
Yes. It has excellent weldability using standard nickel alloy welding procedures.
Is Incoloy 800 resistant to oxidation?
Yes. It provides excellent oxidation and scaling resistance up to approximately 1000°C.
Is Incoloy 800 resistant to chloride SCC?
Yes. Its high nickel content provides excellent resistance to chloride stress corrosion cracking.
What forms are available?
Pipe, tube, plate, sheet, bar, rod, wire, flanges, fittings and forgings.
Why Choose J&A Alloy
✔ ASTM / ASME certified materials
✔ PMI and third-party inspection available
✔ EN 10204 3.1 MTC documentation
✔ OEM machining capability
✔ Global export experience
✔ Fast delivery
✔ Competitive factory pricing
✔ Complete material traceability
