Alloy 825

High performance nickel-iron-chromium alloy with excellent corrosion resistance.

Alloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium (NiCr21Mo), supplied in the hot worked and annealed condition. It achieves good mechanical properties from cryogenic to medium-high temperatures (540oC) and can be significantly strengthened through cold working.

The high nickel content ensures resistance to stress corrosion cracking, combined with molybdenum and copper to strongly resist reducing environments such as sulphuric and phosphoric acids, chromium to resist oxidising environments such as nitric acid, titanium to inhibit intergranular corrosion, and overall resistance to pitting and crevice corrosion.

The alloy cannot be hardened by heat-treatment, but enhanced mechanical properties can be obtained by cold working, especially in sour well tubing strings, and for heat-exchangers, and in chemical processing plants.

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Related Specifications

  • BS 3076 NA16
  • 2.4858
  • ASTM B425
  • UNS N08825

Properties

Chemical Composition

Applications

  • Chemical processing: Phosphoric acid evaporators, pickling-tank heaters, pickling hooks and equipment, and chemical process equipment
  • Power generation: Components for spent nuclear fuel element recovery
  • Tank trucks
  • Propeller shafts

Characteristics

  • Excellent corrosion resistance in a range of media
  • High resistance to oxidation
  • Good ductility and workability
  • Resistant to chloride-ion stress corrosion cracking
  • Good mechanical properties from cryogenic to moderatley high temperatures
  • Approval for pressure vessels with operating temperatures up to 425 ° C

Additional Information

Welding

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