Incoloy™ 825

General Characteristics of Incoloy™ 825

Incoloy™ 825 withstands chloride-iron stress-corrosive cracking, pitting and crevice attack. This is a nickel-chromium-iron alloy with molybdenum, copper and titanium that resists corrosion from oxidation and reducing media. Incoloy™ 825 is readily machinable and offers exceptional fabricability and weldability.

Chemical Composition of Incoloy™ 825

  • Nickel 38.0-46.0
  • Iron 22.0 min
  • Chromium 19.5-23.5
  • Molybdenum 2.5-3.5
  • Copper 1.5-3.0
  • Titanium 0.6-1.2
  • Carbon 0.05 max
  • Manganese 1.0 max
  • Sulfur 0.03 max
  • Silicon 0.5 max
  • Aluminum 0.2 max

Heat Treatment of Incoloy™ 825

  • Anneal between 1700° and 1800°F (927° to 982°C)
  • 1800°F (982°C) anneal maximizes softness and fine grain structure without sacrificing corrosion resistance
  • 1725°F (941°C) optimum stabilizing temperature
  • Rapid cool sections heavier than wire and sheet
  • Remove surface contamination before annealing

Applications of Incoloy™ 825

  • Equipment used to produce and handle phosphoric acid
  • Equipment for handling refinery and coal-washing solutions and sludge
  • Equipment used in the sulfuric acid pickling of copper and ferrous alloys
  • Paper production industry
  • Sour gas and oil well parts
  • Flue gas scrubbers

Machinability of Incoloy™ 825

  • Conventional machining in annealed condition

Workability of Incoloy™ 825

  • Hot work between 1600° and 2150°F (871° and 1177°C)
  • Final working between 1600° and 1800° (871° and 982°C) brings maximum corrosion resistance
  • Air cool; faster cooling OK depending on size of section
  • Well-powered,  rigid equipment recommended for cold forming

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