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Incoloy 825 Alloy - Nicrofer 4221

Incoloy 800*

Available in any of the 'profile options'

This Nickel-Iron-Chromium alloy has good strength and excellent resistance to oxidation and carburisation in high temperature atmospheres. Incoloy 800 also resists corrosion in many aqueous environments.

Chemical Composition Specifications Designations Key Features Typical Applications
Element Min % Max %
Ni 30.00 35.00
Co - 2.00
Cu - 0.75
Cr 19.00 23.00
Al 0.15 0.60
C - 0.10
Si  - 1.00
Mn - 1.50
Ti 0.15 0.60
Fe bal
S - 0.015
BS 3075 NA15
BS 3076 NA15
W.NR 1.4876
UNS N08800
AWS 020
Corrosion Resistant at Ambient Temperatures
Precipitation Hardenable
High temperature static applications**
Process Piping
Heat Exchangers
Carburising Equipment
Heating Element Sheathing
Density 7.94 g/cm³ 0.287 lb/in³
Melting Point 1385°C 2525°F
Coefficient of Expansion 14.4 μm/m °C (20 - 100°C) 7.9 x 10-6 in/in °F (70 - 212°F)
Modulus of Rigidity 78.9 kN/mm² 11444 ksi
Modulus of Elasticity 196.5 kN/mm² 28500 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 -200 to +815 -330 to +1500
Spring Temper 800 - 1100 116 - 159 -200 to +815 -330 to +1500

* Trade name of Special Metals Group of Companies

** Static applications = still/fixed/motionless/rigid

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