Incoloy 825

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Product Description

Incoloy 825

Incoloy 825

Incoloy 825 Alloy is a titanium-stabilized fully austenitic Ni-Fe-Cr alloy with additions of Cu + Mo

  • 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 ℃
  • approval for pressure vessels with wall temperatures up to 450 ℃

Density: 8.14

Corrosion resistance

Incoloy 825 Alloy is a versatile general engineering alloy with resistance to corrosion in acids and alkalis under both oxidizing and reducing conditions. High nickel content gives the alloy virtual immunity to stress corrosion cracking.
Incoloy 825 Alloy is good in media as diverse as sulphuric, sulphurous, phosphoric, nitric and organic acids, alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.
The versatility of Alloy 825 is illustrated by its use in nuclear fuel element dissolvers where a variety of corrosive media, e. g. sulphuric and nitric acids and sodium hydroxide, are handled in the same equipment.

Applications of Incoloy 825:

Incoloy 825 Alloy is used in a wide variety of applications up to a temperature of approximately 550 ℃.

Typical applications are:

  • components such as heating coils, tanks, crates, baskets and chains in sulphuric acid pickling plants
  • fuel element dissolvers
  • sea-water-cooled heat exchangers, offshore product piping systems; tubes and components in sour gas service.
  • heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
  • air-cooled heat exchangers in petroleum refineries
  • food processing
  • chemical plant
  • combustion-resistant alloy for high pressure O2 applications

Chemical composition

Ni Cr Fe C Mn Si Cu Mo Al Ti P S
min(%) 38.0 19.5 bal. 1.5 2.5 0.6
max(%) 46.0 23.5 0.05 1.0 0.5 3.0 3.5 0.2 1.2 0.03 0.03

Mechanical properties

Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Soft Annealed 241 586 30
Typical Values at RT Soft Annealed 333 647 33 160

International Specification Comparison chart

Material Round Bar Plate Pipe
Seamless Welded
B425 B424 B423 B163/704/705
ASTM Min Value SB425 SB424 SB423 SB163
JIS NCF825 H4553 G4901 H4552
DIN 2.4858 17752 17750 17751


Product: Sheet, Coil, Pipe, Bar, Wire and Forgings