Stainless Steel / ALLOY-20 SOL

Alloy 20 is a nickel-iron-chromium based, austenitic alloy with excellent corrosion resistance in chemical environments containing sulfuric acid and many other aggressive environments. This alloy is stabilized with niobium to resist intergranular corrosion. Alloy 20 resists pitting and chloride ion corrosion, better than 304 stainless steel and on par with 316L stainless steel. Its copper content protects it from sulfuric acid. Alloy 20 is often chosen to solve stress corrosion cracking problems, which may occur with 316L stainless. Important advantages of this material are its excellent mechanical properties and comparative ease of fabrication. The presence of Columbium in the alloy minimizes the precipitation of carbides during welding. This product is often used in the processing of synthetic rubber, components for processing gasoline, solvents, explosives, plastics, synthetic fibers, and components for processing pharmaceutical. (UNS N08020)

Chemical Makeup

Element Min Max
Carbon, C - 0.07
Manganese, Mn - 2
Silicon, Si - 1
Sulfur, S - 0.035
Phosphorus, P 0.045
Chromium, Cr 19 21
Nickel, Ni 32 38
Copper, Cu 3 4
Molybdenum, Mo 2 3
Columbium (Niobium), Nb + tantalum - 8 x Carbon - 1

Common Applications

  • Industrial Industrial


  • Excellent Corrosion Resistance
  • Excellent Mechanical Properties
  • Ease Of Fabrication

We stock ALLOY-20 SOL to the following specifications:

  • ASTM-B-473

Click on a cross-section to see the sizes we stock:

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