Products Features
Excellent high-temperature creep rupture strength
A higher carbon content (0.06-0.10%) and optimized Al+Ti precipitation strengthening, INCOLOY 800HT performs significantly better than 800H during long-term service above 850°C, making it particularly suitable for ultra-high-temperature pressure-bearing components with extreme creep life requirements.
Excellent high-temperature oxidation and carburization resistance
The high chromium content (19-23%) combined with aluminum and titanium elements enables the alloy to form a dense oxide layer in oxidizing atmospheres up to 1100°C, providing excellent oxidation and carburization resistance. It is suitable for harsh environments such as hydrocarbon cracking and conversion.
Stable organization and good processability
Exhibits excellent microstructural stability without forming harmful phases (such as the sigma phase) under prolonged high-temperature service. It can be cold and hot worked, formed, and welded using conventional processes, making it suitable for manufacturing complex structural components such as radiant section furnace tubes, manifolds, and high-temperature heat exchangers.
Corrosion resistance stability over a wide temperature range
It remains stable in high-temperature oxidizing, carburizing, and nitriding atmospheres, and also exhibits good resistance to stress corrosion cracking in aqueous media (such as high-temperature and high-pressure water). Its applicable temperature range spans from low temperatures up to approximately 1100°C.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
30.0 - 35.0% |
Elements that provide high-temperature strength and austenite stability |
|
Cr |
19.0 - 23.0% |
Provide antioxidant and anti-carburization capabilities, forming a protective oxide layer |
|
Fe |
remaining quantity |
Structural support to reduce costs |
|
C |
0.06 - 0.10% |
Optimize high-temperature creep performance above the 800H lower limit |
|
Al |
0.15 - 0.60% |
Enhance high-temperature oxidation resistance with total Al+Ti content of 0.85-1.2% |
|
Ti |
0.15 - 0.60% |
Form carbides with carbon to enhance creep properties |
|
Si |
≤ 1.0% |
Deoxidizer, improve antioxidant properties |
|
Mn |
≤ 1.5% |
Deoxidizer, improve hot working properties |
|
P |
≤ 0.045% |
Impurity elements |
|
S |
≤ 0.015% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
7.94 g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1350 - 1400°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
14.2 × 10⁻⁶ /K |
- |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 450 MPa |
ASTM B408 / B409 |
|
Yield Strength (0.2% Offset) |
≥ 170 MPa |
ASTM B408 / B409 |
|
Elongation |
≥ 30% |
ASTM B408 / B409 |
|
Hardness |
≤ 85 HRB |
- |
High-temperature performance
Exhibits excellent oxidation resistance in oxidizing atmospheres below 1100°C. Continuous use temperature can reach up to 1100°C, and for intermittent use, it is recommended not to exceed 980°C.
Creep Rupture Strength (the core indicator where 800HT outperforms 800H): Typical values (rupture strength at 1000 hours):
700°C: Approximately 65 MPa (superior to 800H's 60 MPa);
800°C: Approximately 35 MPa (superior to 800H's 30 MPa);
900°C: Approximately 18 MPa (superior to 800H's 15 MPa).
Carbon and Nitrogen Resistance Properties: With high chromium content combined with aluminum and titanium, it effectively slows down the penetration of carbon and nitrogen, making it suitable for high-temperature equipment in harsh atmospheres such as radiation sections of ethylene cracking furnaces and ammonia conversion furnaces.
Applicable Media:
High-temperature air, combustion flue gases
Carburizing atmospheres (e.g., hydrocarbon pyrolysis)
Nitriding atmospheres
High-temperature and high-pressure water (nuclear reactor coolant)
Sulfur-containing atmospheres (corrosion risk due to pitting should be noted)
INCOLOY 800HT is specifically designed for extreme high-temperature creep service conditions and is recommended for use in the following areas at operating temperatures of 870-1000°C:
Application Fields
-
Petrochemical (extreme high temperature): Radiation section furnace tubes of ethylene cracking furnaces, reformer tubes for hydrogen production, high-temperature gas headers, and manifolds
-
Heat treatment industry: High-temperature fixtures, baskets, and radiation tubes (above 850°C)
-
Power generation: Ultra-high-temperature superheater/reheater tubes, advanced ultra-supercritical boiler components
-
Industrial furnaces: High-temperature furnace rolls, bottom rolls, and critical components of heat treatment furnaces
-
Metallurgy: Components of high-temperature annealing furnaces, heat-resistant parts in galvanizing baths
-
Hydrogen/ammonia production: Large reformer furnace tubes, heat exchangers
-
Solid waste incineration: High-temperature grates, flue gas treatment equipment
-
High-temperature sensors/sheaths: Thermocouple protection tubes (requiring maximum service life)
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive INCOLOY 800HT materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable engineering technology. Dependable delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of INCOLOY 800HT?
Q: What heat treatment is required for INCOLOY 800HT?
Q: What is the maximum usage temperature?
Q: What is the difference between INCOLOY 800HT and 800H?
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