ALLOY825 (Incoloy825)

Corrosion Resistance
Chemical Composition
Mechanical properties
International Standard Comparision Chart Stock Form And Sizes
Round Bars
Hex Bars
Nuts And Washers
Spring Washer
Hex Bolt
Stud Bolt
Sourceable Materials


ALLOY825 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°C (1020°F)
  • approval for pressure vessels with wall temperatures up to 450°C (842°F)

Stock Form and Sizes

Round BarsSpecification:ASTM B425/B564※ ASME SB425/SB564※ NACE MR0175(ISO 15156) ※B564/SB564 Apply to Forged Bar Only

Sourceable Ex-Stock Material for other Forms from Distributors World-Wide

Equivalent Round Bars Plate Pipe/Tube Welding Rod & Wire
Min Max Min Max
Incoloy825 6~350 0.81~50.8

*○: Various sizes available in stock. △: Only limited sizes available in stock. ☆: Please contact us for more details.
* We can supply materials and products that comply with various standards including ASTM, ASME, AMS, and NACE standards. Please contact us for more details.

Corrosion resistance

Alloy 825 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.
Alloy 825 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.


Alloy 825 is used in a wide variety of applications up to a temperature of approximately 550 °C (1020 °F).

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 0.025 1.0 0.5 3.0 3.5 0.2 1.2 0.020 0.010

※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical properties(Round Bar)

  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

Please contact us with any questions about reference or value of plate and pipe.
※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

International Standard Comparison Chart

  Material Round Bars Plates/Sheets Pipe/Tube
Seamless Welded
B425 B424 B423 B163/704/705
ASME SB425 SB424 SB423 SB163
JIS NCF825 H4553 G4901 H4552  
DIN 2.4858 17752 17750 17751  
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