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Incoloy® 800 Rod
Available Configurations
Properties common to all products in this list
| Length |
|---|
| 10 mm to 1000 mm |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
Incoloy® 800 Rod (Ni 32.5/Cr 21/Fe, UNS N08800) is a nickel-iron-chromium alloy rod in the Annealed temper, designed for sustained high-temperature service where both oxidation resistance and carburization resistance must be maintained simultaneously:
Simultaneous oxidation and carburization resistance
The combination of 32.5% nickel and 21% chromium provides both the stable austenitic structure that resists carbon ingress in carburizing atmospheres and the protective chromia scale that resists oxidation. This dual resistance is the defining advantage of Incoloy® 800 over ferritic and martensitic stainless steels in reformer, petrochemical, and nuclear high-temperature environments where both oxidizing and carburizing conditions may be encountered in the same service cycle.
Stable austenitic structure to the melting range
The nickel and chromium content stabilises the austenitic phase from room temperature to the melting range of 1350–1420°C, providing structural integrity and resistance to the sigma phase embrittlement and 475°C embrittlement that limit the high-temperature service of ferritic and duplex stainless steels. This structural stability is the basis for Incoloy® 800’s qualification for long-duration high-temperature service.
Confirmed for service in high-temperature gas-cooled reactor environments
The carburization and oxidation resistance of Incoloy® 800 is confirmed in the nuclear materials literature for service in high-temperature gas-cooled reactor environments, where helium coolant at elevated temperatures containing trace impurities creates conditions that challenge both oxidation and carburization resistance simultaneously, qualifying the alloy as a candidate material for steam generator heat transfer tubes in very high temperature nuclear reactors.
Annealed condition for forming, welding, and long-term stability
The Annealed condition provides the ductility needed for forming, bending, and welding operations on rod and fabricated components, and establishes the fully recrystallized microstructure that is the correct metallurgical starting point for long-term high-temperature stability. Cold work remaining in non-annealed material can accelerate sensitization and reduce creep life in sustained high-temperature service.
Established in petrochemical reformer and fertilizer plant service
Incoloy® 800 has a long service record in steam reformer furnaces, ethylene pyrolysis units, and fertilizer plant heater sheaths, applications defined by combined exposure to high temperature, reducing or steam atmospheres, and the risk of carburization from hydrocarbon process streams. This service history validates the alloy’s dual corrosion resistance in demanding industrial environments.
Industrial Applications
Incoloy® 800 Rod is selected for sustained high-temperature structural applications where oxidation resistance and carburization resistance must coexist, spanning petrochemical, power generation, and nuclear industries:
- ✦ Furnace support rods and radiant tube elements in heat treatment and annealing furnaces
- Used for furnace support rods, radiant tube elements, and furnace structural components in heat treatment and annealing furnaces, where the combination of oxidation resistance in combustion atmospheres, carburization resistance in carbon-containing furnace atmospheres, and structural integrity at sustained high temperature qualifies Incoloy® 800 over ferritic stainless steels and lower-nickel austenitic grades.
- ✦ Reformer support and heater sheath elements in petrochemical and fertilizer industries
- Applied as reformer furnace support elements and heater sheath components in the petrochemical and fertilizer industries, where sustained exposure at high temperature to process gas streams containing hydrocarbons, steam, and hydrogen creates combined oxidation and carburization conditions that the dual resistance of Incoloy® 800 is specifically designed to withstand.
- ✦ Structural components in nuclear steam generator assemblies
- Used for structural rod components in nuclear steam generator assemblies, where the confirmed performance of Incoloy® 800 in high-temperature gas-cooled reactor environments and its candidate material status for very high temperature reactor steam generator tubes qualifies the alloy for structural components in nuclear thermal systems operating above the range of austenitic stainless steels.
- ✦ Ethylene pyrolysis and high-temperature chemical reactor components
- Applied as structural rod and support elements in ethylene pyrolysis furnaces and high-temperature chemical reactor systems, where process temperatures, hydrocarbon-containing atmospheres, and the requirement for long service intervals without material degradation by carburization or oxidation define the material specification.
- ✦ High-temperature carburization and oxidation kinetics studies, VHTR material research
- Used in research for high-temperature carburization and oxidation kinetics studies, long-term metallurgical stability investigations in Ni-Cr-Fe alloys, VHTR candidate material characterization under simulated reactor atmosphere conditions, and as a reference alloy for comparative studies of high-temperature corrosion mechanisms in combined oxidizing and carburizing environments.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 180-250 |
| Elongation at break( % ) | <45 |
| Modulus of elasticity( GPa ) | 196 |
| Izod impact strength( J m⁻¹ ) | 160 |
| Tensile strength( MPa ) | 400-900 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 20 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Melting point( C ) | 1350-1420 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 460@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 11.5-12.9@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 14.2-15.8@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.95 |
Tolerances
| Diameter | =<10mm | ±10% |
|---|---|---|
| Diameter | >10mm | ±5% |
| Length | <100mm | ±1mm |
| Length | >=100mm | +5 / -1% |