N08811/Incoloy800HT/NS112B High-Temperature Alloy Bolts Withstand Extreme Environments
The N08811 (Incoloy 800HT, NS112B) bolt is a high-performance fastener designed for extreme environments requiring superior heat and corrosion resistance. Made from nickel-iron-chromium alloy, it excels in high-temperature applications up to 1100°C (2012°F) while maintaining structural integrity and oxidation resistance.
This alloy offers enhanced creep and stress rupture strength, making it ideal for use in heat exchangers, furnace components, petrochemical processing, and power plants. It resists carburization, sulfidation, and chloride stress corrosion cracking, ensuring durability in aggressive conditions.
Compliant with ASTM B408 and ASME SB408 standards, N08811 bolts provide excellent mechanical stability and prolonged service life. Their combination of high strength, thermal stability, and oxidation resistance makes them a reliable choice for demanding industries such as aerospace, chemical processing, and nuclear power.
When selecting Incoloy 800HT bolts, consider factors like operating temperature, environment, and mechanical load to ensure optimal performance and longevity.
| Chemical Composition Wt.% | % | Fe | C | Si | Mn | S | Cr | Ni | Cu | Ti | Al |
| Min | 39.5 | 0.06 | | | | 19 | 30 | | 0.15 | 0.15 |
| Max |
| 0.1 | 1 | 1.5 | 0.015 | 23 | 35 | 0.75 | 0.6 | 0.6 |
| Physical Constants | Density(g/cm³) | 7.94 |
| Melting Range(℃) | 1357-1385°C |
| AlloyState | Recovery Strength Reduction (RP0.2) N/mm2 | Tensile Strength Rm N/mm2) | Elongation A5% |
| Solid Solution State | 275 | 550 | 30 |
Trade Code
The N08811 (Incoloy 800HT / NS112B) bolt is made from a high-temperature and corrosion-resistant nickel-iron-chromium alloy.
Key features:
1. Material Composition & Designation
- UNS N08811 – The material standard designation.
- Incoloy 800HT – Trade name by Special Metals Corporation.
- NS112B – Chinese material designation.
2. High-Temperature Strength
- Designed for applications exposed to elevated temperatures (up to 1100°C / 2012°F).
- Excellent creep and stress rupture resistance due to controlled carbon, aluminum, and titanium additions.
3. Corrosion & Oxidation Resistance
- Exceptional resistance to oxidation and carburization in high-temperature environments.
- Superior resistance to sulfidation and nitridation, making it ideal for heat-treating and petrochemical applications.
- Good resistance to aqueous corrosion and chloride stress corrosion cracking.
4. Mechanical Properties
- High tensile strength and yield strength at elevated temperatures.
- Maintains structural integrity under thermal cycling conditions.
Applications
- Petrochemical & Refining – Used in heat exchangers, furnace components, and catalytic systems.
- Power Generation – Ideal for boiler parts and superheater fasteners.
- Aerospace & Automotive – Suitable for exhaust systems, jet engines, and gas turbines.
- Heat Treatment Industry – Used in fixture bolts, furnace fasteners, and retorts.
Standards & Specifications
- ASTM B408 / B564 / B366 – Covers bars, forgings, and fittings.
- ASME SB408 / SB564 – High-temperature pressure applications.
- DIN 1.4876 / 1.4959 – European equivalent grades.
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