Incoloy 825

Incoloy 825 (Alloy 825)

(UNS N08825) (EN 2.4858 - NiCr21Mo)

INCOLOY® alloy 825 (UNS N08825/W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium.

Alloy 825 is a titanium-stabilized fully austenitic nickel-iron-chromium alloy with additions of copper and molybdenum.Alloy 825 is characterized by:

  • High resistance to chloride-induced stress corrosion.
  •  Good resistance to chloride-induced pitting and crevice corrosion.
  •  Good resistance to oxidizing and non-oxidizing hot acids.
  •  Good toughness, even under continuous operation, at both room and elevated temperatures, up to approximately 550 °C (1.020 °F).
  • Approval for pressure vessels with wall temperatures up to 450 °C (842 °F) acc. to VdTÜV and 538 °C (1,000°F) for Section VIII Division 1 vessels acc. to ASME.

Chemical Composition

Physical Properties

Product Designations & Standards


Applications include chemical processing, pollution control, oil and gas recovery, acid production, pickling operations, nuclear fuel reprocessing, and handling of radioactive wastes.
Applications for alloy 825 are similar to those for INCOLOY alloy 020.

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