Alloy 28 (UNS N08028 / W.Nr. 1.4563)
Alloy 28 (UNS N08028 / W.Nr. 1.4563) is a highly corrosion-resistant austenitic alloy offering resistance to a variety of media. The alloy resists attack in reducing media, due to its contents of nickel, copper and molybdenum; and resistant to oxidizing species due to its high level of chromium. Alloy 28 offers resistance to general, localized and stress-induced corrosion by chlorides and hydrogen sulfides. Thus, it is widely used in oilfield applications. Tubes are cold worked to high levels of strength for downhole service in deep sour gas wells. With its excellent combination of strength and corrosion resistance, Alloy 28 also finds applications in the process industries. It is especially useful for handling phosphoric acid. Due to its resistance to chlorides, Alloy 28 tubes may be used in the marine industry for seawater-cooled heat exchangers.
Equivalent Grades
Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
Sanicro 28 Incoloy alloy 28 Nicrofer 3127 LC | 00Cr27Ni31Mo3Cu | – | Alloy 28 | N08028 | X1NiCrMoCuN 31-27-4 | 1.4563 | Z1NCDU31-27-03 | X1NiCrMoCu 31-27-4 | – | 2584 |
Chemical Composition, %
Alloy | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | Fe |
Alloy 28 | ≤0.03 | ≤1.00 | ≤2.50 | ≤0.030 | ≤0.030 | 26.0-28.0 | 30.0-34.0 | 3.0-4.0 | 0.6-1.4 | Bal |
Typical Physical and Mechanical Properties (RT, Annealed)
Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
8.00 | 1405-1425 | 500 | 214 | 40 | 70/90 |
Available Products and Specifications
Rod, Bar, Wire and Forgings | EN 10088-3, EN10272 |
Plate, Sheet and Strip | ASTM B709, EN 10088-2 |
Pipe and Tube | ASTM B668, ASTM B829, ASME SB668, ASME SB709, ASME SB829 |
Welding Product | – |
Others | ASTM A403, ASTM B668 |
Features
- Very high corrosion resistance in strong acids
- Very good resistance to stress corrosion cracking (SCC) and intergranular corrosion in various environments
- High resistance to pitting and crevice corrosion
- Good weldability
Applications
- Chemical processing
- Pollution control equipment
- Oil and gas well piping
- Nuclear fuel reprocessing
- Acid production
- Pickling equipment