General Description
Alloy 20 is a iron based nickel-chromium-molybdenum stainless steel developed to withstand sulfuric acid. The high nickel content combined with chromium, molybdenum and copper gives the alloy excellent resistance to intergranular corrosion and stress corrosion and good resistance to pitting and crevice corrosion.
Alloy 20 is used in wide applications up to temperatures of around 500℃. Such as equipments for the manufacturer of sulphuric acid and for processed based on sulphuric acid, production of plastics and synthetic fibers, and equipments for food processing to protect against contamination.
Chemical Composition
| Grade | Fe% | Ni% | Cr% | Mo% | Mn% | Cu% | Si% | C% | S% | P% | Cb+Ta% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 20 | Bal. | 32.5-35.0 | 19.0-21.0 | 2.0-3.0 | Max 2.0 | 3.0-4.0 | Max 1.0 | Max 0.06 | Max 0.035 | Max 0.035 | 8*C-1.0 |
Designations
UNS N08020
Werkstoff Nr. 2.4660
Specifications
Alloy 20 Bar: ASTM B473
Alloy 20 Forging: ASTM B462
Alloy 20 Sheet/Plate: ASTM B463
Alloy 20 Pipe/Tube: ASTM B729
Physical Properties
Density：8.0 g/cm3
Mechanical Properties
Solution Annealed
Tensile: Min 600 MPa
Yield: Min 320 MPa
Elongation: Min 35%