Alloy 20

Key characteristics of Alloy 20 include:

1. Corrosion Resistance:

   • Alloy 20 is highly resistant to corrosion in a variety of corrosive environments, including sulfuric acid, phosphoric acid, nitric acid, and chloride-containing media.
   • It exhibits good resistance to pitting and crevice corrosion, making it suitable for use in aggressive chemical processing applications.

2. Chemical Composition:

   • Nickel (Ni): Approximately 32–38%
   • Chromium (Cr): Approximately 19–21%
   • Iron (Fe): Balancing element
   • Copper (Cu): Approximately 3–4%
   • Molybdenum (Mo): Approximately 2–3%
   • Other elements such as manganese, niobium, and sulfur are present in smaller amounts.

3. Mechanical Properties:

   • Alloy 20 has good mechanical properties, including high tensile strength and excellent impact toughness.
   • It maintains its mechanical properties at elevated temperatures, contributing to its suitability for high-temperature applications.

4. Weldability:

   • Alloy 20 is readily weldable using standard welding techniques, including TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding.
   • Welded joints maintain the corrosion resistance of the base metal, making it suitable for fabricating complex structures.

5. Heat Resistance:

   • The alloy retains its strength and corrosion resistance at elevated temperatures, making it suitable for high-temperature applications.

6. Fabrication:

   • Alloy 20 can be easily fabricated into various forms, such as sheets, plates, pipes, and fittings.
   • It can be cold-formed or hot-formed, and machining and forming processes are generally straightforward.

7. Applications:

   • Commonly used in chemical processing equipment, such as reactors, heat exchangers, pipes, and valves.
   • Utilized in industries such as pharmaceuticals, petrochemicals, food processing, and more.
   • Suitable for applications where resistance to corrosive chemicals is critical.

8. Resistance to Stress-Corrosion Cracking:

   • Alloy 20 exhibits good resistance to stress-corrosion cracking, which is essential for maintaining the integrity of components in corrosive environments.

9. Cost Consideration:

   • Alloy 20 is typically more expensive than standard austenitic stainless steels, and its use is often justified by its unique corrosion resistance properties.