Incoloy 825

Alloy 825 is a Nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The alloys chemical composition provides exceptional resistance to many corrosive environments. The Nickel content is sufficient for resistance to Chloride-ion stress corrosion cracking. The nickel, combined with molybdenium and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acid. The molybdenium also aids resistance to pitting and crevice corrosion. The alloys Chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salts. The titanium addition, with appropriate heat treatment, will stabilize the alloy against sensitization to intergranular corrosion.

Chemical Composition

C Cr Fe Ni Al Ti Cu Mo
Max Max Max Max
0.05 19.25 – 23.5 0.50 38.0 – 46.0 0.2 0.6 – 1.2 1.5 – 3.0 2.5 – 3.5

Design Features

  • Good resistance to stress corrosion cracking.
  • Satisfactory resistance to pitting and crevice corrosion.
  • Good resistance to oxidizing and non-oxidizing hot acids.
  • Good mechanical properties at both room and elevated temperatures up to approximately 550 ̊ C (1020 ̊ F).
  • Permission for pressure-vessel use at wall temperature up to 425 ̊ C (800 ̊ F).

Typical Applications

  • Components such as heating coils, tanks, crates, baskets and chains in sulfuric acid pickling plants
  • Fuel element dissolvers – the alloy with- stands the different media (sulfuric and nitrate acids, caustic hydroxide etc.) used in processing
  • Sea water cooled heat exchangers; offshore product piping systems tubes and components in sour gas service – resistant to chloride- ion stress-corrosion cracking
  • Pipelines carrying wet sulphur dioxide gas and pulp digesters in the papermaking process
  • Heat exchangers, evaporators, scrubbers, etc. used in phosphoric acid production
  • Air cooled heat exchangers used in the processing of liquid petroleum gas (LPG)

<b>Nickel</b>

Availability

  • Alloy 825 Seamless Pipe 1/4”- 8”
  • Alloy 825 Welded Pipe 8” – 24”
  • Alloy 825 Butt-Weld Fittings 1/2” – 24”
  • Alloy 825 Flanges 1/2” – 24”
  • Alloy 825 Bar 1/8” – 11”
  • Alloy 825 Seamless Tube 1/8” – 1”
  • Alloy 825 Pressure Fittings 1/4” – 2”
  • Alloy 825 Plate 1/8” – 3”

Specifications

  • ASTM B443, B705, B366, B425, B564
  • ASME SB443, SB705, SB366, SB925, SB564

Tensile Requirements

Tensile Strength (KSI) 85
Yield Strength (KSI) 35
KSI can be converted to MPA (Megapascals) by multiplying by 6.895.

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