Nickel AlloysAlloy 825

High performance nickel-iron-chromium alloy with excellent corrosion resistance.

Alloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium (NiCr21Mo), supplied in the hot worked and annealed condition. It achieves good mechanical properties from cryogenic to medium-high temperatures (540^oC) and can be significantly strengthened through cold working.

The high nickel content ensures resistance to stress corrosion cracking, combined with molybdenum and copper to strongly resist reducing environments such as sulphuric and phosphoric acids, chromium to resist oxidising environments such as nitric acid, titanium to inhibit intergranular corrosion, and overall resistance to pitting and crevice corrosion.

The alloy cannot be hardened by heat-treatment, but enhanced mechanical properties can be obtained by cold working, especially in sour well tubing strings, and for heat-exchangers, and in chemical processing plants.

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Related Specifications

BS 3076 NA16
2.4858
ASTM B425
UNS N08825

Properties

Chemical Composition

Chemical Element	% Present
Carbon (C)	0.00 - 0.05
Chromium (Cr)	19.00 - 23.00
Manganese (Mn)	0.00 - 1.00
Silicon (Si)	0.00 - 0.50
Sulphur (S)	0.00 - 0.03
Nickel (Ni)	38.00 - 46.00
Copper (Cu)	1.50 - 3.00
Hydrogen (H)	0.00 - 22.00
Molybdenum (Mo)	2.50 - 3.50
Iron (Fe)	Balance

Mechanical Property	Value
Elongation A50 mm	30 %
Tensile Strength	517 N/mm²
0.2% Proof Stress	207 N/mm²
Proof Stress	241 MPa
Tensile Strength	586 MPa

Physical Property	Value
Density	8.1 g/cm³
Melting Point	1370-1400°C

Applications

Chemical processing: Phosphoric acid evaporators, pickling-tank heaters, pickling hooks and equipment, and chemical process equipment
Power generation: Components for spent nuclear fuel element recovery
Tank trucks
Propeller shafts

Characteristics

Excellent corrosion resistance in a range of media
High resistance to oxidation
Good ductility and workability
Resistant to chloride-ion stress corrosion cracking
Good mechanical properties from cryogenic to moderatley high temperatures
Approval for pressure vessels with operating temperatures up to 425 ° C

Additional Information

Welding

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Disclaimer

This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon. Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed S online) and manufacturers' data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources. Material supplied by the Company may vary significantly from this data but will conform to all relevant and applicable standards. As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied. Advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. All transactions are subject to the Company's current Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.