A nickel-copper alloy, precipitation hardenable through additions of aluminum and titanium.
- ASTM B425
- UNS N008825
- BS ISO 3076 NA16
- NACE MR0175 / ISO 15156-3
- Werkstoffe 2.4858
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Alloy 825 is an austenitic nickel-iron-chromium alloy with additions of copper, molybdenum, and titanium-stabilised to resist pitting and intergranular attack. Molybdenum and copper enable Alloy 825 to resist reducing agents and acids, while chromium gives Alloy 825 resistance to oxidising conditions. Alloy 825 is therefore highly suitable where required properties include good resistance to stress-corrosion cracking, pitting, and crevice corrosion.
Alloy 825 is also often used where oxidising and non-oxidising hot acids (especially sulphuric, phosphoric, nitric and organic acids, as well as alkalis such as sodium or potassium hydroxide) come into contact with the metal.
Mechanical properties are stable up to approximately 550°C (1020°F).
These properties make Alloy 825 ideally suitable for use in heating coils, tanks, baskets and chains in sulphuric acid pickling plants, heat exchangers in phosphoric and other acid and chemical production applications. Other applications include sea-water-cooled heat exchangers, offshore product piping systems, for components in sour gas service in pollution- control equipment, and oil and gas well piping and in nuclear fuel reprocessing components.
We can supply material in the hot worked annealed and peeled or annealed and cold drawn condition. Fully certified material, additional testing available.
Alloy 825 Chemical Composition
Alloy 825 Mechanical Properties
|Tensile Strength min||85||586||-|
|Yield Strength (0.2% offset), min||35||241||-|
|Elongation in 2", or 5D 0 mm or 4D min %||-||-||30|
For more technical information download our Alloy 825 information sheet here
Alloy 825 is also often used where oxidising and non-oxidising hot acids come into contact with the metal. Markets include pollution control, metal cleaning and scaling, oil and gas and marine applications.
Typical end uses include:
- heating coils
- baskets and chains in sulphuric acid pickling plants
- heat exchangers in chemical production applications.
- sea-water-cooled heat exchangers
- offshore product piping systems
- pollution-control equipment components
- oil and gas well piping
- nuclear fuel reprocessing components.
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