Valves in Alloy 20 and their use.
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 |
