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| Specification | Value |
|---|---|
| UNS Number | N08811 |
| ASTM/ASME Standard | ASTM B564 / SB564 |
| Tensile Strength | 450 MPa (min) |
| Yield Strength | 170 MPa (min) |
| Density | 7.94 g/cm³ |
| Max Service Temperature | 1100°C |
| Element | Composition (%) |
|---|---|
| Ni | 30.0–35.0 |
| Cr | 19.0–23.0 |
| Fe | bal |
| C | 0.06–0.10 |
| Al+Ti | 0.85–1.20 |
| Mn | ≤1.5 |
| Si | ≤1.0 |
Incoloy 800HT Fasteners derive their exceptional high-temperature stability from a carefully balanced composition of nickel (30-35%), chromium (19-23%) and iron, with controlled additions of aluminium and titanium (Al+Ti 0.85-1.20%). The elevated carbon content (0.06-0.10%) compared to standard 800 grade promotes the formation of stable carbides, while nickel provides austenitic structure stability and resistance to carburization. Chromium forms a protective oxide layer essential for oxidation resistance at elevated temperatures.
These alloying characteristics translate into outstanding engineering benefits, including superior resistance to oxidation, carburization and sulfidation environments up to 1100°C. The material exhibits excellent creep and stress-rupture strength, maintaining structural integrity under sustained high-temperature loading. Its resistance to grain boundary sensitization and thermal fatigue makes it ideal for fasteners in furnace components, heat exchangers and petrochemical applications where cyclic thermal exposure and corrosive atmospheres demand reliable, long-term mechanical performance.
Specifications
Incoloy 800HT Fasteners deliver high-temperature strength and corrosion resistance, with specifications defined by mechanical properties, dimensional tolerances, and technical data suited to demanding service. Available in standard fastener sizes and forms, they are commonly produced to relevant industry standards when required for performance-critical applications.
| Property | Value |
|---|---|
| Tensile Strength | 450-690 MPa |
| Yield Strength (0.2% offset) | 170 MPa min |
| Elongation | 30% min |
| Hardness | ≤223 HB |
| Modulus of Elasticity | 196 GPa |
| Thermal Expansion (20-100°C) | 14.4 x10⁻⁶/°C |
| Thermal Conductivity | 11.9 W/m·K |
| Density | 7.94 g/cm³ |
| Melting Range | 1357-1385°C |
| Max Service Temperature | 1100°C |
| Parameter | Details |
|---|---|
| Bolt Standard | ASME B18.2.1 |
| Stud Bolt Standard | ASME B16.5 / API 6A |
| Nut Standard | ASME B18.2.2 |
| Washer Standard | ASME B18.21.1 |
| Thread Form | UNC, UNF, Metric Coarse |
| Diameter Range | M6-M100 / 1/4"-4" |
| Length Range | 10mm-500mm |
| Available Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Inspection Standards | EN 10204 3.1 / 3.2 |
Applications
