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
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
Designations
W.Nr 1.4958
W.Nr 1.4959
UNS N08811
AWS 021
Specifications
BS 3076 NA 15H
Chemical Composition
The chemical composition of Incoloy® 800 is indicated in the table below:
| 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 |
Alloy Details
Incoloy® 800HT density, melting point, coefficient of expansion, and modulus of elasticity is indicated in the table below:
| Density | Melting Point | Coefficient of Expansion | Modulus of Rigidity | Modulus of Elasticity |
|---|---|---|---|---|
| 7.94 g/cm³ | 1385 °C | 14.4 μm/m °C (20 – 100 °C) | 78.9 kN/mm² | 196.5 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 AWI | Type | Temperature | Time | Cooling |
|---|---|---|---|---|
| Annealed or Spring Temper | Stress Relieve | 450 – 470 °C (840 – 880 °F) | 0.5 – 1 Hr | Air |
Properties
The typical mechanical properties of Incoloy® 800HT:
| Annealed | ||
|---|---|---|
| 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 strength | 800 – 1200 N/mm² | 116 – 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
