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Alloy 20 stainless steel offers excellent corrosion resistance, including excellent resistance to oxidizing and moderate reducing corrosion, as well as excellent resistance to stress corrosion cracking and good resistance to localized corrosion. Alloy 20 has excellent resistance to stress corrosion cracking and good resistance to localized corrosion in mixed reducing media. It is suitable for use in sulfuric acid environments and industrial equipment with sulfuric acid solutions containing halogen ions and metal ions. JN Alloy 20's main products include plates, bars, pipes, strips, and flange forgings.
At 33% nickel, Alloy 20 has practical immunity to chloride stress corrosion cracking. This alloy is often chosen to solve SCC(stress corrosion cracking) problems, which may occur with 316L stainless.
Alloy 20 is primarily composed of nickel, iron, and chromium, with small amounts of carbon, manganese, silicon, molybdenum, and copper. This chemical composition makes Alloy 20 extremely corrosion-resistant in harsh environments such as strong acids, strong bases, and chlorides.
| Composition | Value |
| Ni | 32.0-38.0 |
| Cr | 19.0-21.0 |
| Cu | 3.0-4.0 |
| Mn | ≤2.0 |
| Mo | 2.0-3.0 |
| Si | ≤1.0 |
| C | ≤0.07 |
| P | ≤0.045 |
| S | ≤0.035 |
| Fe | Remain |
| Ni+Ti | 8-1.0 |
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
Alloy 20 | 80[551] | 35[241] | 30 |
Density: 8.06 g/cm³.
Melting point: 1440-1450°C (2624-2642°F).
Thermal conductivity: 10.8 W/(m·K).
Coefficient of thermal expansion: 14.0 µm/m·K.
Electrical conductivity: 1.27 × 10^6 S/m.
| Product | Standards | Show |
| Alloy 20 Pipe & Tube SMLS | ASTM B729 |  |
| Alloy 20 Welded Pipe | ASTM B474, ASTM B464 |  |
| Alloy 20 Sheet Plate | ASTM B463 |  |
| Alloy 20 Bars | ASTM B472, ASTM B473 |  |
| Alloy 20 Forgings | ASTM B564 |  |
| Alloy 20 Fittings | ASTM B366 |  |
STANDARD | WERKSTOFF NR. | UNS | AFNOR | EN |
Alloy 20 | 2.4660 | N08020 | Z2NCUD31-20AZ | NiCr20CuMo |
Synthetic rubber manufacturing equipment
Processing of pharmaceuticals, plastics and organic and heavy chemicals
Tanks, piping, heat exchangers, pumps, valves, and other process equipment
Acid cleaning and pickling equipment
Chemical process piping, reactor vessels
Bubble caps
Petrochemical process equipment
Food and dye production
