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Incoloy® 825 is a Nickel-Iron-Chromium alloy with additions of Molybdenum and Copper. It has excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking and to localised pitting and crevice corrosion. It is also especially resistant to sulphuric and phosphoric acids.
Incoloy® 825 is also known as Nicrofer 4221, Superimphy 82 and Ferrochronin 825.
|Chemical Composition||Specifications||Designations||Key Features||Typical Applications|
BS 3075 NA 16
BS 3076 NA 16
(NACE MR 0175)
|Resistant to reducing environments such as those containing sulphuric and phosphoric acids
Resistant to a variety of oxidising substances such as nitric acid and nitrates
Resistant to chloride-ion stress corrosion cracking and, pitting & crevice corrosion
Good for chemical processing
Nuclear Fuel Reprocessing
|Density||8.14 g/cm³||0.294 lb/in³|
|Coefficient of Expansion||14.0 μm/m °C (20 – 100°C)||7.8 x 10-6 in/in °F (70 – 212°F)|
|Modulus of Rigidity||75.9 kN/mm²||11009 ksi|
|Modulus of Elasticity||196 kN/mm²||28428 ksi|
|Heat Treatment of Finished Parts|
|Condition as supplied by Alloy Wire||Type||Temperature||Time (Hr)||Cooling|
|Annealed or Spring Temper||Stress Relieve||450 – 470||840 – 880||0.5 – 1||Air|
|Condition||Approx. tensile strength||Approx. operating temperature|
|Annealed||600 – 800||87 – 116||-100 to +250||-145 to +480|
|Spring Temper||800 – 1100||116 – 159||-100 to +250||-145 to +480|
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies