Nickel Alloy 800 / 800H / 800HT – Properties, Applications and Technical Data
Alloy 800, 800H and 800HT are nickel-iron-chromium alloys developed for applications requiring good corrosion resistance and stability at high temperatures.
The materials are often used in heat treatment equipment, petrochemical processes, power plants and other high-temperature environments.
The alloys combine good oxidation resistance, resistance to carburization and high creep strength.
Properties of Alloy 800 Series
Alloy 800 Series are austenitic nickel-based alloys with good structural stability at high temperatures.
The nickel content contributes to resistance to stress corrosion cracking while chromium provides good oxidation resistance.
- Type: nickel-iron-chromium alloy
- Alloy: Ni-Fe-Cr
- Structure: austenitic alloy
- Designations: Alloy 800, Alloy 800H, Alloy 800HT, UNS N08800, UNS N08810, UNS N08811, Werkstoff 1.4876, 1.4958, 1.4959
- Typical composition: Ni ~30–35%, Cr ~19–23%, Fe ~balance
Advantages
- Good oxidation resistance at high temperatures
- Resistant to carburization
- Good resistance to stress corrosion cracking
- Stable structure at high temperatures
- High creep strength in 800H and 800HT
Limitations
- More expensive than standard stainless steels
- Not intended for very aggressive acid environments
- Machining can be more demanding than for simpler alloys
Differences between Alloy 800, 800H and 800HT
- Alloy 800: basic version with balanced properties
- Alloy 800H: higher carbon content for improved creep strength
- Alloy 800HT: optimized for high fracture and creep strength through controlled amounts of carbon, aluminum and titanium
Common product shapes
- Round bar
- Sheet and strip
- Tubes and tubes
- Forgings
- Special dimensions according to drawing
Typical components
- Heat exchangers
- Furnace equipment
- Components in the petrochemical industry
- Parts in power plants
- Piping systems in high temperature environments
Corrosion and heat resistance
Alloy 800 series offers good resistance to oxidation and carburization in high temperature environments.
The material is often used where both heat resistance and corrosion resistance are important.
Environments where Alloy 800 performs well
- Heat treatment furnaces
- Petrochemical plants
- Power plants
- High temperature process equipment
Environments to avoid
- Extremely aggressive chemical environments
- Applications where simpler materials are sufficient
Technical data
| Yield strength (0.2%) |
~170–310 MPa |
| Tensile strength |
~500–700 MPa |
| Elongation |
~30 % |
| Density |
~7.9 g/cm³ |
| Modulus of elasticity |
~196 GPa |
| Max temperature |
up to approx. 816 °C depending on application |
With a global network of suppliers, we can offer Alloy 800 / 800H / 800HT in technical dimensions for demanding industrial applications.
Contact us for price, availability and technical advice.
Supplier of Alloy 800 / 800H / 800HT
HARALD PIHL is one of Europe's largest suppliers of special alloys, including high-temperature alloys in the Alloy 800 series.
- Large stock of nickel and special alloys
- Materials according to ASTM and ISO
- Fast global delivery
- Full material certification
- Over 100 years of experience in the metal industry