Incoloy 825 is a nickel-iron-chromium alloy that is often used in high-temperature applications where resistance to corrosion is crucial. The alloy is particularly well-suited for use in sulfuric acid environments, as well as for use in environments containing phosphoric acid, acetic acid, and other corrosive chemicals. Incoloy 825 tubing is an excellent choice for use in heat exchangers, chemical processing equipment, and other industrial applications where resistance to corrosion and high-temperature strength are essential.
Chemical Composition
The chemical composition of Incoloy 825 tubing typically includes:
- Nickel (Ni) – 38.0-46.0%
- Iron (Fe) – 22.0-28.0%
- Chromium (Cr) – 19.5-23.5%
- Molybdenum (Mo) – 2.5-3.5%
- Copper (Cu) – 1.5-3.0%
- Titanium (Ti) – 0.6-1.2%
- Aluminum (Al) – 0.2-0.8%
- Carbon (C) – 0.05% max
- Manganese (Mn) – 1.0% max
- Silicon (Si) – 0.5% max
- Sulfur (S) – 0.03% max
- Phosphorus (P) – 0.03% max
Applicable Specifications and Standards
Incoloy 825 tubing is available in a variety of specifications and standards, including:
- ASTM B423 – Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221) Seamless Pipe and Tube
- ASTM B704 – Standard Specification for Welded Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08825 and N08221) Tubes
- ASTM B163 – Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat Exchanger Tubes
- ASTM B775 – Standard Specification for General Requirements for Nickel and Nickel Alloy Welded Pipe
In addition to these specifications, Incoloy 825 tubing may also be certified to other industry standards, such as ASME Boiler and Pressure Vessel Code Section III, NACE MR0175, and ISO 15156.
Features and Benefits
Incoloy 825 tubing offers several key features and benefits, including:
- Corrosion resistance – Incoloy 825 tubing is highly resistant to corrosion in a variety of environments, including those containing sulfuric acid, phosphoric acid, and acetic acid.
- High-temperature strength – The alloy retains its strength at elevated temperatures, making it well-suited for use in high-temperature applications.
- Weldability – Incoloy 825 tubing can be welded using a variety of methods, including gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and submerged arc welding (SAW).
- Versatility – The alloy is versatile and can be used in a wide range of industrial applications, including heat exchangers, chemical processing equipment, and oil and gas production.
Incoloy 825 tubing is a highly versatile and corrosion-resistant alloy that is well-suited for use in high-temperature applications where resistance to corrosive chemicals is crucial. With a range of specifications and certifications available, Incoloy 825 tubing is an excellent choice for a wide range of industrial applications.