Alloy 20 valves are a chromium-nickel-molybdenum alloy most often used for high concentrations of sulfuric acid. Alloy 20 is resistant to pitting and chloride ion corrosion, and the element of copper impedes corrosion in sulfuric acid.

Alloy 20 material specification and equivalents

ASTM specification A351 CN7M
European (DIN) Werkstoff number 2.4660
Unified Numbering System (UNS) N08020
Type 22Cr5Ni3MoN
Other designations Carpenter 20

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