GENERAL SCOPE 

Alloy 20 is an iron base nickel chromium molydenmun alloy often used in sulfuric acid environments. The addition of niobium ( Columbium) allows it to be readily welded and limits carbide precipitation in the weld heat affected zone which otherwise would reduce its corrosion resistance.

The annealing temperature is limited to 1010°C (1850°F) to ensure the alloy is “stablized” and is sometimes referred to as a stablized anneal. Annealing at a higher temperature is possible, but reduced corossion resistance, especially when welded, will result.

Small diameter bars can be supplied cold worked to give a higher 0.2% proof stress values.

Trade Name 20Cb-3 (3)

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