Incoloy 800HT bar represents a high-performance nickel-iron-chromium alloy specifically engineered to meet the demanding requirements of nuclear and conventional power generation systems. As a controlled-composition variant of Incoloy 800H, this alloy delivers superior creep resistance and long-term structural stability at elevated temperatures up to 815°C (1500°F). The bar form offers exceptional versatility for machining critical components that must withstand extreme operating conditions while maintaining mechanical integrity.
Application field
High temperature components, such as turbine blades, guide vanes, turbine disks, high pressure compressor disks, machine manufacturing and combustion chambers used in the manufacture of aviation, naval and industrial gas turbines.
Item | 800 | 800H | 800HT | 825 | 925 |
C | ≤0.1 | 0.05-0.1 | 0.06-0.1 | ≤0.05 | ≤0.03 |
Mn | ≤1.5 | ≤1.5 | ≤1.5 | ≤1 | ≤1 |
Fe | rest | rest | rest | rest | rest |
P | -- | -- | -- | ≤0.02 | ≤0.03 |
S | ≤0.015 | ≤0.015 | ≤0.015 | ≤0.03 | ≤0.03 |
Si | ≤1 | ≤1 | ≤1 | ≤0.5 | ≤0.5 |
Cu | ≤0.75 | ≤0.75 | ≤0.75 | 1.5-3 | 1.5-3 |
Ni | 30-35 | 30-35 | 30-35 | 38-46 | 42-46 |
Al | 0.15-0.6 | 0.15-0.6 | 0.15-0.6 | 0.2-1 | 0.15-0.5 |
Ti | 0.15-0.6 | 0.15-0.6 | 0.15-0.6 | 0.6-1.2 | 1.9-2.4 |
Cr | 19-23 | 19-23 | 19-23 | 19.5-23.5 | 19.5-23.5 |
Mo | -- | -- | -- | 2.5-3.5 | 2.5-3.5 |
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Material Composition and Key Properties
The alloy's optimized chemistry (Fe-30-35Ni-19-23Cr with Ti/Al stabilization and controlled carbon content of 0.06-0.10%) provides:
Enhanced creep and rupture strength at temperatures above 600°C (1112°F)
Outstanding resistance to oxidation and carburization in aggressive atmospheres
Excellent microstructural stability during prolonged high-temperature service
Good resistance to chloride stress corrosion cracking
Maintained ductility and toughness after long-term exposure
Primary Applications
Nuclear Power Systems:
Steam generator tubes and support structures
Reactor coolant system components
Nuclear fuel processing equipment
Primary circuit auxiliary components
Conventional Power Generation:
Superheater and reheater tubing systems
High-pressure steam piping and headers
Gas turbine exhaust and combustor components
Heat recovery steam generator (HRSG) parts
Petrochemical Processing:
Steam methane reformer furnace tubes
Pyrolysis furnace components
High-temperature heat exchangers
Catalytic reforming system parts
User Benefits and Selection Criteria
Power industry professionals specify Incoloy 800HT bars for:
Proven performance in critical high-temperature applications
Superior creep resistance compared to standard austenitic alloys
Long-term microstructural stability under sustained loads
Cost-effective solution versus higher-nickel superalloys
Regulatory compliance with ASME Boiler and Pressure Vessel Code (Section III for nuclear applications)
Technical Specifications
Complies with UNS N08811, ASTM B408 (bar product)
Typical room temperature tensile strength: 500-700 MPa
Minimum creep rupture strength: 100 MPa at 700°C/100,000 hours
Excellent weldability using conventional methods (with proper procedures)
Material Advantages Over Alternatives
Superior high-temperature strength compared to 304H/316H stainless steels
More cost-effective than Inconel 617/625 for many applications
Better oxidation resistance than 9Cr-1Mo ferritic steels
More stable microstructure than standard 800H at extreme temperatures
Conclusion
Incoloy 800HT bar stock provides an optimal balance of high-temperature strength, creep resistance, and cost-effectiveness for critical power generation components. Its proven performance in nuclear and conventional power plants makes it the material of choice for engineers designing systems that must operate reliably under extreme conditions for extended periods.
