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Incoloy 825 Alloy - Nicrofer 4221

Incoloy* 825

Available in any of the 'profile options'

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.

Chemical Composition Specifications Designations Key Features Typical Applications
Element Min % Max %
Ni 38.00 46.00
Co - 2.00
Cu 1.50 3.00
Cr 19.50 23.50
Mo 2.50 3.50
Al - 0.20
C - 0.05
Si - 0.50
Mn - 1.00
S - 0.03
Ti 0.60 1.20
Fe Bal
ASTM B425
BS 3075 NA 16
BS 3076 NA 16
ISO 15156-3
(NACE MR 0175)
W.Nr 2.4858
UNS N08825
AWS 022
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
Chemical Processing
Nuclear Fuel Reprocessing
Acid Production
Pickling Equipment
Density 8.14 g/cm³ 0.294 lb/in³
Melting Point 1400°C 2550°F
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
°C °F
Annealed or Spring Temper Stress Relieve 450 - 470 840 - 880 0.5 - 1 Air
Properties
Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
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

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