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| UNS Number | N08810 |
|---|---|
| ASTM/ASME Standard | ASTM B564 / ASME SB564 |
| Tensile Strength | ≥450 MPa |
| Yield Strength | ≥170 MPa |
| Max Service Temperature | 1100°C |
| Density | 7.94 g/cm³ |
| Element | Composition (%) |
|---|---|
| Ni | 30.0–35.0 |
| Cr | 19.0–23.0 |
| Fe | bal |
| C | 0.05–0.10 |
| Al | 0.15–0.60 |
| Ti | 0.15–0.60 |
| Mn | ≤1.5 |
| Si | ≤1.0 |
Incoloy 800H Fasteners derive their exceptional performance from a carefully balanced composition of nickel, chromium and iron. Nickel content, maintained at 30 to 35 percent, provides excellent resistance to carburization and chloride stress corrosion cracking while stabilizing the austenitic structure. Chromium, present at 19 to 23 percent, forms a protective oxide layer that enhances resistance to oxidation and sulfidation at elevated temperatures. Controlled additions of aluminum and titanium promote grain stability and improve creep rupture strength, while a higher carbon content compared to standard Incoloy 800 enhances high-temperature strength retention.
These metallurgical characteristics translate into significant engineering benefits for fastener applications. The alloy exhibits outstanding resistance to oxidation, carburization and sulfidation environments, making it ideal for high-temperature service in petrochemical, power generation and heat-treatment industries. Its excellent creep and stress rupture properties ensure long-term structural integrity under sustained thermal and mechanical loading. Combined with good weldability and fabricability, Incoloy 800H Fasteners deliver reliable, long-lasting performance in demanding fastening applications where strength retention and corrosion resistance at elevated temperatures are essential.
Specifications
Incoloy 800H Fasteners are engineered for high-temperature service, with specifications defined by their mechanical properties, corrosion resistance, and precise dimensional tolerances across standard fastener sizes. The technical data emphasizes strength, stability, and suitability for demanding industrial assemblies, making them a reliable choice for performance-critical applications.
| Tensile Strength | ≥450 MPa |
|---|---|
| Yield Strength (0.2% Offset) | ≥170 MPa |
| Elongation | ≥30% |
| Hardness | ≤90 HRB |
| Modulus of Elasticity | 196 GPa |
| Thermal Expansion (20-100°C) | 14.4 µm/m·°C |
| Thermal Conductivity | 11.5 W/m·K |
| Density | 7.94 g/cm³ |
| Melting Range | 1357-1385°C |
| Max Service Temperature | 1100°C |
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
|---|---|
| Stud Bolt Standard | ASME B16.5, MSS SP-75 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6 to M100 / 1/4" to 4" |
| Length Range | 10mm to 500mm |
| Available Forms | Hex Bolts, Studs, Nuts, Washers |
| Custom Sizes | Available on request |
| Manufacturing Standard | ASTM B564 / ASME SB564 |
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