Alloy 20 (UNS N08020 / W.Nr. 2.4660)

Alloy 20 (UNS N08020 / W.Nr. 2.4660) is a nickel iron chromium alloy with additions of copper and molybdenum. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. This alloy has excellent resistance to general corrosion, pitting and crevice corrosion in chemical containing chlorides and sulfuric, phosphoric and nitric acids. Used for tanks, piping, heat exchangers, pumps, valves and other process equipment.

Equivalent Grades

Carpenter 20Cb-3
Incoloy alloy 20
Nicrofer 3620 Nb
ХН28ВМАБAlloy 20N08020NiCr20CuMo2.4660

Chemical Composition, %

Alloy 20≤0.07≤1.0≤2.0≤0.045≤0.03519.0-21.032.0-38.02.0-3.03.0-4.08*C-1.0Bal

Typical Physical and Mechanical Properties (RT, Annealed)

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

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B462, ASTM B472, ASTM B473, ASME SB472, ASME SB473, ISO 9723, ISO 9724, ISO 9725, DIN 17752-17754
Plate, Sheet and StripASTM A240, ASTM A480, ASTM B463, ASTM B906, ASME SA240, ASME SA480, ASME SB463, ASME SB906, ISO 6208, DIN 17750
Pipe and TubeASTM B729, ASTM B829, ASTM B468, ASTM B751, ASTM B464, ASTM B775, ASTM B474, ASME SB729, ASME SB829, ASME SB468, ASME SB751, ASME SB464, ASME SB775, ASME SB474, ISO 6207, DIN 77751
Welding Product
OthersDIN 17744, ASTM B366, ASTM B462, ASTM B471, ASTM B475, ASME SB366, ASME SB462, ASME SB471, ASME SB475


  • Excellent general corrosion resistance to sulfuric acid
  • Excellent resistance to chloride stress corrosion cracking
  • Excellent mechanical properties and fabricability
  • Minimal carbide precipitation during welding
  • Excels in resisting corrosion to hot sulfuric acids


  • 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