Seamless Incoloy 800 Nickel Alloy Pipe is made from a nickel-iron-chromium alloy known for its exceptional resistance to high-temperature oxidation and carburization. Its balanced composition, including nickel (30.00–35.00%), chromium (19.00–23.00%), and iron (≥39.5%), ensures that this austenitic alloy retains high mechanical strength and corrosion resistance from room temperature up to 1100°C.
Manufactured to standards including ASTM B163 and ASTM B407, Incoloy 800 seamless pipes and tubes undergo precision processing to ensure uniform wall thickness, consistent microstructure, and superior surface finish. The alloy’s unique combination of nickel and chromium forms a stable oxide layer, protecting it from scaling and degradation in harsh thermal environments. This makes it indispensable for industries where reliability under extreme temperatures is non-negotiable.
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. delivers Incoloy 800 products that meet the highest quality benchmarks, offering tailored solutions for critical applications in power generation, chemical processing, and beyond.
| Grade | Ni | Cr | Fe | C | Mn | Si | S | Al | Ti | P |
| Incoloy 800 | 30.00–35.00 | 19.00–23.00 | ≥39.5 | ≤0.10 | ≤1.50 | ≤1.00 | ≤0.015 | 0.15–0.60 | 0.15–0.60 | ≤0.045 |
| Property | Value |
| Tensile Strength | ≥550 MPa (80 ksi) |
| Yield Strength (0.2% offset) | ≥240 MPa (35 ksi) |
| Elongation | ≥30% |
| Hardness (HB) | ≤195 |
| Property | Value |
| Density | 8.0 g/cm³ |
| Melting Point | 1350–1400°C |
| Thermal Conductivity | 15.1 W/m·K (100°C) |
| Electrical Resistivity | 103 μΩ·cm |
| Thermal Expansion | 13.3 μm/m·°C (20–100°C) |
| Elastic Modulus | 200 GPa |
| Parameter | Incoloy 800 (N08800) | Incoloy 800H (N08810) | Incoloy 800HT (N08811) |
| Carbon Content | ≤0.10% | 0.05–0.10% | 0.06–0.10% |
| Al+Ti Content | 0.30–1.20% | 0.85–1.20% (min) | 0.85–1.20% (min) |
| High-Temp Strength | Good | Excellent | Superior |
| Creep Resistance | Moderate | High | Very High |
| Typical Use | General high-temp | Long-term high-temp | Extreme high-temp |
| Service Temp. | Up to 870°C | Up to 980°C | Up to 1100°C |
Key Differences:
800H and 800HT have higher carbon and controlled Al+Ti ratios for improved creep strength at elevated temperatures.
800HT is optimized for extreme heat with enhanced stability in cyclic thermal environments.
Oxidation Resistance: Withstands continuous service up to 870°C, maintaining structural integrity in furnace components and heat exchangers.
Carburization Resistance: The nickel-chromium matrix resists carbon absorption in carburizing atmospheres, outperforming low-alloy steels.
Acid & Alkali Resistance: Performs well in neutral to slightly acidic solutions, making it suitable for chemical processing.
Chloride Environments: Resists stress corrosion cracking in mild chloride solutions, though not recommended for severe chloride exposure.
Thermal Fatigue Resistance: Maintains ductility and strength in cyclic temperature applications, ideal for thermal cycling systems.
Weldability: Readily weldable by TIG, MIG, and stick welding, with minimal risk of carbide precipitation when proper procedures are followed.
Formability: Supports cold and hot working, allowing complex shapes for heat treatment fixtures and high-temperature pipes.
Machinability: Can be machined with standard tools, though slow speeds and high lubrication are recommended for optimal results.
Boiler Systems: Superheater and reheater tubes, steam headers, and pigtails in coal-fired power plants.
Nuclear Industry: Steam generators and reactor components requiring high-temperature stability and radiation resistance.
Heat Exchangers: Equipment for handling corrosive gases and liquids in refineries and chemical plants.
Reactors & Furnaces: Components in ethylene production and other high-temperature chemical syntheses.
Furnace Components: Radiant tubes, retorts, and baskets for heat-treating processes in automotive and aerospace industries.
Industrial Ovens: Structural parts in annealing and tempering furnaces.
Gas Turbine Components: Exhaust systems and heat shields in aircraft engines.
Geothermal Energy: Tubing for high-temperature, acidic geothermal brine extraction.
Composition: Incoloy 800 has higher nickel (30–35%) and chromium (19–23%) than 304 (8–10.5% Ni, 18–20% Cr), offering superior high-temperature oxidation resistance.
Temperature Range: 800 withstands up to 870°C, while 304 is suitable up to 425°C.
Incoloy 800 resists mild seawater corrosion at ambient temperatures but may suffer pitting in hot or agitated seawater. For severe marine environments, consider alloys like Incoloy 825 or duplex stainless steels.
Incoloy 800 is rated for continuous service up to 870°C. For higher temperatures (up to 1100°C), Incoloy 800HT is recommended due to its enhanced creep resistance.
No, Incoloy 800 is non-magnetic in its annealed state, making it suitable for applications where magnetic interference is a concern.
Use nickel-based filler metals (e.g., ERNiCr-3) and low heat input to prevent grain growth. Post-weld annealing is optional but can improve ductility for critical components.
Standard pickling or bright annealing is sufficient for most applications. Polishing can be applied for aesthetic purposes or to minimize scaling in high-temperature service.
Mill test certificates as standard
EN 10204 3.1B and 3.2 certifications upon request
Third-party inspection reports (e.g., radiography, PMI) for quality assurance
