Incoloy 800 is a high-performance nickel-iron-chromium-based corrosion-resistant alloy specifically designed for high-temperature, high-pressure, and corrosive environments. Combining excellent workability with superior oxidation resistance, carburization resistance, and stress corrosion cracking resistance, it is an ideal material choice for the chemical, energy, and heat treatment industries.

Key Performance Advantages

  • High-Temperature Oxidation Resistance: Chromium content of 19%–23% forms a dense oxide layer, enabling continuous service temperatures up to 800°C.

  • Carburization and Nitridation Resistance: Suitable for furnace tube applications in carbon- or nitrogen-bearing atmospheres.

  • Chloride Stress Corrosion Cracking Resistance: Outperforms standard stainless steels in chloride-containing media.

  • Stable Microstructure: Nickel content of 30%–35% ensures a stable austenitic structure and non-magnetic properties.

  • Good Workability and Weldability: Compatible with a wide range of conventional processes, facilitating the manufacture of complex components.

Chemical Composition (wt%)

Element Range Function
Nickel (Ni) 30.0–35.0 Stabilizes austenite; resists reducing media corrosion
Chromium (Cr) 19.0–23.0 Forms protective oxide layer; resists high-temperature oxidation and sulfidation
Iron (Fe) Balance (≥39.5) Provides structural integrity; optimizes cost and hot workability
Carbon (C) ≤0.10 Controls susceptibility to intergranular corrosion
Aluminum (Al) 0.15–0.60 Provides strengthening and synergistic oxidation resistance
Titanium (Ti) 0.15–0.60 Stabilizes carbides; enhances resistance to intergranular corrosion

Physical and Mechanical Properties (Solution Annealed Condition)

Parameter Value
Density Approx. 8.0 g/cm³
Melting Range 1350°C – 1400°C
Magnetic Attraction Non-magnetic
Tensile Strength (RT) ≥ 520 MPa
Yield Strength (RT) ≥ 205 MPa
Elongation ≥ 35%

Note: Tensile strength at 650°C remains above 400 MPa.

Typical Applications of Incoloy 800

Chemical & Petrochemical

  • Nitric acid condensers

  • Acetic anhydride cracking tubes

  • Acetic acid production equipment

  • Heat exchangers and reactors

Power Generation & Nuclear

  • Nuclear steam generator components

  • Steam heating tubes

  • Ethylene cracking furnace tubes

  • Ultra-supercritical power plant components

Heat Treatment Industry

  • Industrial furnace tubes

  • Radiant tubes

  • Annealing furnace components

  • Bellows expansion joints

Fabrication and Welding Guidelines

  • Hot Forming: Temperature range 1200°C – 950°C, followed by water quenching or rapid air cooling. Solution treatment is required after forming.

  • Cold Forming: Work hardening rate is higher than that of austenitic stainless steels. For cold reductions exceeding 10%, intermediate annealing or a secondary solution treatment is recommended.

  • Welding: Conventional processes such as GTAW (TIG), GMAW (MIG), and SAW are applicable. Pulsed arc welding is recommended. Filler metals should match the high-alloy composition of the base material.

Why Choose Incoloy 800?

  • Superior corrosion resistance to standard stainless steels in high-temperature, high-pressure aqueous media

  • Combines heat resistance with fabricability, ideal for critical components requiring long-term service

  • Well-established industrial track record with clear material standards (e.g., ASTM B407, B408)

For detailed specifications, material test certificates, or custom sizes, please contact us.