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List of Alloys & profiles

List of Alloys & profiles

Alloy Wire International

Datasheet: Incoloy® 800HT

Incoloy® 800HT

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.

Available in all profile options

Incoloy® 800HT - Alloy Wire International 1

Key Features

Incoloy® 800HT offers the following key features:

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**

Typical Applications

Incoloy® 800HT is known to be suitable for the following applications:

Chemical Processing
Petrochemical Processing
Industrial Furnaces
Heat Treating Equipment


W.Nr 1.4958
W.Nr 1.4959
UNS N08811
AWS 021


BS 3076 NA 15H

Chemical Composition

The chemical composition of Incoloy® 800 is indicated in the table below:

ElementMin %Max %

Alloy Details

Incoloy® 800HT density, melting point, coefficient of expansion, and modulus of elasticity is indicated in the table below:

DensityMelting PointCoefficient of ExpansionModulus of RigidityModulus of Elasticity
7.94 g/cm³1385 °C14.4 μm/m °C (20 – 100 °C)78.9 kN/mm²196.5 kN/mm²
0.287 lb/in³

2525 °F

7.9 x 10-6 in/in °F (70 – 212 °F)

11444 ksi

28500 ksi

Heat treatment of finished parts

The typical heat treatment of Incoloy® 800HT:

Condition as supplied by AWITypeTemperatureTimeCooling
Annealed or Spring TemperStress Relieve450 – 470 °C (840 – 880 °F)0.5 – 1 HrAir


The typical mechanical properties of Incoloy® 800HT:

Approx. tensile strength<800 N/mm²<116 ksi
Approx. operating temperature depending on load** and environment -200 to +1000 °C-330 to +1830 °C
Spring Temper
Approx. tensile strength800 – 1200 N/mm²116 – 174 ksi
Approx. operating temperature depending on load** and environment -200 to +1000 °C-330 to +1830 °C

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