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

Sanicro 28
Incoloy alloy 28
Nicrofer 3127 LC
00Cr27Ni31Mo3CuAlloy 28N08028X1NiCrMoCuN 31-27-41.4563Z1NCDU31-27-03X1NiCrMoCu 31-27-42584

Chemical Composition, %

Alloy 28≤0.03≤1.00≤2.50≤0.030≤0.03026.0-28.030.0-34.03.0-4.00.6-1.4Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsEN 10088-3, EN10272
Plate, Sheet and StripASTM B709, EN 10088-2
Pipe and TubeASTM B668, ASTM B829, ASME SB668, ASME SB709, ASME SB829
Welding Product
OthersASTM A403, ASTM B668


  • 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


  • Chemical processing
  • Pollution control equipment
  • Oil and gas well piping
  • Nuclear fuel reprocessing
  • Acid production
  • Pickling equipment