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Alloy 825 is a nickel-iron-chromium alloy that exhibits excellent resistance to general corrosion, pitting and crevice corrosion, intergranular corrosion, and stress corrosion cracking. Molybdenum and copper additions provide resistance to reducing agents and acids.

Chloride-ion stress-corrosion cracking is adequate to prevent chloride-ion stress. Molybdenum contributes to the resistance of metals to pitting and crevice corrosion. Chromium provides resistance to oxidising conditions, while titanium prevents the alloy from becoming sensitised to intergranular corrosion.

Alloy 825 exhibits excellent mechanical properties at temperatures ranging from cryogenic to moderately high temperatures near 540°C. Additionally, it has high impact strength at room temperature and retains its strength when frozen. Cold working can significantly strengthen this alloy.

Characteristic :

  •  Nickel Iron Chromium alloy
  •  Available in the hot worked and solution annealed condition
  •  Excellent corrosion resistance in a range of media
  •  Low strength
  •  Resistant to chloride-ion stress corrosion cracking
  •  Used in applications up to approx. 540°C (1000°F)

Specification :

  •  ASTM B425
  •  UNS N08825
  •  BS 3076 NA 16 - 1989
  •  Werkstoff Nr. 2.4858

Chemical Analysis :

C Mn Si S Cr Ni Cu Ti Ai Mo Fe -
Min - - - - 19.5 38.0 1.5 0.6 - 2.5 22.0 %
Max 0.05 1.0 0.5 0.03 23.5 46.5 3.0 1.2 0.2 3.5 - %

Mechanical Properties :

Tensile PSI (MPA) min Yield (0.2% offset), PSI (MPA) Min Elongation in 2" or 4D min% Hardness Rockwell Max
85,000 (586) 35,000 (241) 30 35 (hardness is typically 200-240 HBW - if used for seals 160HBW max)


  • Chemical processing
  • Propeller shafts
  • Marine exhaust systems with sulphur containing gases
  • Sour gas and oil wells and nuclear reprocessing and handling of radioactive wastes
Work Process

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