ALLOYS
Alloy 20
Alloy 20, commonly known as Carpenter® 20, is a nickel–chromium–molybdenum alloy developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, food, pharmaceutical, power generation, and plastics industries. Alloy 20 resists pitting, and chloride ion corrosion and its copper content protects it from sulfuric acid.
UNS: N08020
Stock Sizes: 1/4” – 1/2” OD
Specifications:
- Seamless Tube: ASTM B729
- NACE MR0175/MR0103
Available Processing:
- Cold Worked and Bright Annealed
Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification
Chemical Composition (%)
| Chemical | Percentage |
|---|---|
| Iron (Fe) | Balance |
| Chromium (Cr) | 19-21% |
| Nickel (Ni) | 32-38% |
| Molybdenum (Mo) | 2-3% |
| Manganese (Mn) | 2% Max |
| Silicon (Si) | 1% Max |
| Copper (Cu) | 3-4% |
| Carbon (C) | 0.07% Max |
| Chemical | Percentage |
|---|---|
| Sulfur (S) | 0.035% Max |
| Phosphorus (P) | 0.045% Max |
| Columbium/Niobium (Nb) + Tantalum (Ta) | 8 x carbon – 1.00 |
| – | – |
| – | – |
| – | – |
| – | – |
Physical Properties
| Property | Measurement |
|---|---|
| Density (lb/in3) | 0.292 |
| Elongation (min %) | 30 |
| Minimum Yield (psi) | 35,000 |
| Minimum Tensile (psi) | 80,000 |
| Max Hardness (HRB) | 95 |