0
Incoloy 800HT (UNS N08811) is a nickel-iron-chromium alloy engineered for high-temperature stability, creep resistance, and oxidation resistance in demanding thermal applications. Its optimized composition includes.
Incoloy 800HT (UNS N08811) is a nickel-iron-chromium alloy engineered for high-temperature stability, creep resistance, and oxidation resistance in demanding thermal applications. Its optimized composition includes:
30-35% Nickel for corrosion resistance and thermal stability
19-23% Chromium for oxidation resistance
Controlled Carbon (0.06-0.10%) for enhanced creep strength
Titanium & Aluminum for microstructural stability
Key Properties:
✔ Creep rupture strength: 100 MPa at 700°C (100,000 hours)
✔ Oxidation resistance: Stable up to 900°C (1652°F)
✔ Thermal fatigue resistance: Withstands cyclic heating/cooling
✔ Weldability & Fabricability: Compatible with standard welding techniques
Parameter
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 |
For more details, pls directly contact us.
Primary Applications
1. Power Plant Superheaters & Boilers
Ultra-supercritical (USC) coal-fired boilers
Heat Recovery Steam Generators (HRSGs) in combined cycle plants
Biomass & waste-to-energy systems
2. Gas Turbine & Exhaust Systems
Exhaust ducting & expansion joints
Combustor liners & transition ducts
Waste heat recovery units
3. Petrochemical & Process Heating
Steam methane reformer (SMR) tubes
Ethylene cracking furnace coils
High-temperature heat exchangers
Industry Trends Driving Demand
1. Shift Toward High-Efficiency Power Plants
Growing adoption of ultra-supercritical (USC) boilers requiring 800°C+ materials
Retrofitting of aging coal plants with advanced superheater tubes
2. Expansion of Gas Turbine & Combined Cycle Plants
Increasing demand for durable exhaust systems in high-efficiency turbines
Need for thermal fatigue-resistant alloys in cyclic operations
3. Renewable & Waste-to-Energy Growth
Biomass & waste incineration plants requiring corrosion-resistant tubing
Hydrogen-ready infrastructure development
Technical Advantages Over Alternatives
Better creep resistance than standard Incoloy 800H
More cost-effective than Inconel 617 for moderate temperatures
Superior oxidation resistance vs. 9Cr-1Mo steels
Proven reliability in long-term power plant service
Standards & Compliance
ASTM B407 / ASME SB407 (Seamless tubing)
EN 10216-5 (European pressure vessel standard)
ASME Boiler & Pressure Vessel Code, Section I & VIII
Future Outlook
Increasing demand for high-efficiency, low-emission power systems
Growth in hydrogen-compatible heat exchangers
Expansion in geothermal & concentrated solar power (CSP) applications
E-mail: dzx@dlx-alloy.com
Mobile: +8619906119641
Tel: 0086-19906119641
WhatsApp: +86-19906119641
Add: NO.32 West Taihu Road, Xinbei District, Changzhou, Jiangsu
