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Incoloy® 800HT
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Incoloy® 800HT

Available in any of the 'profile options'

This Nickel-Chromium-Iron alloy has the same basic composition as Incoloy 800, but has significantly higher creep rupture strength, resultant from the close control of the carbon, aluminium and titanium contents. It has good strength and excellent resistance to oxidation and carburisation in high temperature atmospheres. It also resists corrosion in many aqueous environments.

Incoloy® 800HT is also known as Nicrofer 3220 HP.

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 0.05 0.10
Si 1.00
Mn 1.50
Ti 0.15 0.60
Fe bal
S 0.015
BS 3076 NA 15H W.Nr 1.4958
W.Nr 1.4959
UNS N08811
AWS 021
Higher creep rupture strength than Incoloy 800 due to close control of C, Al, Ti
Excellent resistance to oxidation and carburisation at high temperatures
Corrosion resistant in many aqueous environments
High temperature static applications**
Chemical Processing
Petrochemical Processing
Industrial Furnaces
Heat Treating Equipment
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
Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Annealed 600 – 800 87 – 116 -200 to +1000 -330 to +1830
Spring Temper 800 – 1100 116 – 159 -200 to +1000 -330 to +1830

The above tensile strength ranges are typical. If you require different please ask.

*Trade name of Special Metals Group of Companies

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

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