Incoloy 800: A High-Performance Nickel-Iron-Chromium Alloy for Extreme Environments
Product Overview
Incoloy 800 is a versatile austenitic nickel-iron-chromium alloy designed to deliver exceptional performance in high-temperature and corrosive environments. Developed to bridge the gap between stainless steels and higher-cost nickel-based alloys, Incoloy 800 combines excellent oxidation resistance, carburization resistance, and mechanical strength at elevated temperatures. It is widely used in industries such as chemical processing, petrochemicals, power generation, and heat treatment.
Key Features & Benefits
High-Temperature Stability:
Maintains structural integrity at temperatures up to 1,100°F (593°C).
Resists oxidation and scaling in both continuous and cyclic thermal exposures.
Corrosion Resistance:
Performs well in oxidizing and reducing atmospheres, including sulfur-containing environments.
Resists chloride stress corrosion cracking and aqueous corrosion in acidic/alkaline solutions.
Carburization & Nitridation Resistance:
Ideal for hydrocarbon-processing applications where carburizing gases are present.
Mechanical Strength:
Retains tensile and creep strength under prolonged high-temperature stress.
Chemical Composition (ASTM B409)
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 30.0–35.0 |
| Chromium (Cr) | 19.0–23.0 |
| Iron (Fe) | Balance |
| Carbon (C) | ≤0.10 |
| Aluminum (Al) | 0.15–0.60 |
| Titanium (Ti) | 0.15–0.60 |
| Manganese (Mn) | ≤1.50 |
| Silicon (Si) | ≤1.00 |
| Copper (Cu) | ≤0.75 |
| Sulfur (S) | ≤0.015 |
Physical Properties
Density: 7.94 g/cm³
Melting Range: 1350–1400°C (2462–2552°F)
Thermal Expansion Coefficient: 14.4 μm/m·°C (20–100°C)
Thermal Conductivity: 11.7 W/m·K (100°C)
Electrical Resistivity: 0.93 μΩ·m (20°C)
Mechanical Properties (Room Temperature)
Tensile Strength: 500–655 MPa
Yield Strength (0.2% Offset): 170–345 MPa
Elongation: 30–45%
Hardness: 135–185 HB
Applications
Incoloy 800 is specified for critical components requiring reliability in harsh conditions:
Heat Exchangers & Steam Generators: Resists corrosion from superheated steam and aggressive process fluids.
Furnace Components: Radiant tubes, muffles, and burner nozzles in heat-treating furnaces.
Chemical Processing: Reactors, piping, and valves handling acids, alkalis, and organic compounds.
Nuclear Power Systems: Steam generator tubing and core components due to low radiation absorption.
Hydrogen Production: Catalyst tubing in reformers exposed to high-pressure hydrogen.
Advantages Over Competing Alloys
Cost-Effective: Lower nickel content compared to Inconel alloys reduces material costs.
Versatility: Performs well across a broad temperature range (-150°C to 700°C).
Weldability: Compatible with common welding techniques (TIG, MIG, SMAW) using matching filler metals.
Available Forms
Incoloy 800 is supplied in multiple forms to suit industrial needs:
Tubing & Pipes (Seamless/Welded)
Sheets, Plates, & Strips
Bars, Forgings, & Fasteners
Wire & Custom Fabricated Parts
Standards & Specifications
ASTM: B409, B514, B515
ASME: SB-409, SB-514
UNS Designation: N08800
EN/DIN: 1.4876, 1.4958
Why Choose Incoloy 800?
Incoloy 800 strikes an optimal balance between performance and cost, making it a preferred material for engineers tackling extreme thermal and corrosive challenges. Its proven track record in critical applications ensures long-term reliability and reduced maintenance costs.
For technical datasheets or custom specifications, contact our alloy specialists today.
This product overview highlights Incoloy 800’s capabilities while aligning with industry standards and user requirements for clarity and detail. Let me know if you need further refinements!
