Alloy 20 Stainless Steel

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This super-austenitic nickel alloy is often used in stress corrosion or cracking solutions that may occur with other stainless steel alloys such as 316L. Developed specifically for use when sulfuric acid is present, it is resistant to pitting, chloride ion corrosion and sulfuric acid corrosion.

Chemical Formula
Nickel 32-35%, Chromium 19-21%, Carbon 0.06%, Copper 3-4%, Molybdenum 2-3%, Manganese 2%, Silicon 1%, Niobium 1%, Iron 31-44%.

SS Pipe Tube & Fittings

Common Trade names
Carpenter 20, AL 20, CN7M


  • Superior corrosion, pitting and crevice resistance
  • Contains Niobium for stabilization against sensitization and resultant intergranular corrosion
  • Excellent mechanical properties and fabricability
  • Minimal carbide precipitation during welding

Due to its high resistance to corrosion, Alloy 20 is used in chemical processing, food production, pharmaceutical, power generation and plastics applications. Valves, pumps and pressure systems are some of the most popular components where Alloy 20 is employed.

Available Stock Sizes
See specific product page for unique sizes. Here at Atlantic Stainless no inquiry is too large or too small. Feel free to contact us today for a quote on any of your custom size orders.