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| Specification | Value |
|---|---|
| UNS Number | N08825 |
| ASTM/ASME Standard | ASTM B564 / ASME SB564 |
| Tensile Strength | 586 MPa min |
| Yield Strength | 241 MPa min |
| Density | 8.14 g/cm³ |
| Max Service Temperature | 550°C |
| Element | Composition (%) |
|---|---|
| Ni | 38.0–46.0 |
| Cr | 19.5–23.5 |
| Mo | 2.5–3.5 |
| Cu | 1.5–3.0 |
| Ti | 0.6–1.2 |
| Fe | 22 bal |
| C | ≤0.05 |
| Mn | ≤1.0 |
Incoloy 825 fasteners derive their exceptional performance from a carefully balanced composition of nickel, iron, chromium, molybdenum, copper and titanium. Nickel provides resistance to chloride-ion stress corrosion cracking, while chromium contributes oxidation and corrosion resistance across a range of aggressive environments. Molybdenum and copper act together to enhance resistance to reducing acids such as sulfuric and phosphoric acid, and titanium stabilises the alloy against sensitisation during welding or elevated temperature exposure, preserving grain boundary integrity.
These metallurgical characteristics translate into fasteners that deliver outstanding resistance to pitting, crevice corrosion and stress corrosion cracking in marine, chemical processing and oil and gas environments. The alloy maintains good mechanical strength and ductility across a wide temperature range, ensuring reliable clamping performance under thermal cycling and mechanical loading. Its combination of corrosion resistance, weldability and dimensional stability makes Incoloy 825 fasteners a preferred choice for critical bolted joints exposed to harsh, corrosive service conditions.
Specifications
Incoloy 825 Fasteners are precision-engineered corrosion-resistant components defined by their mechanical properties, dimensional specifications, and technical data for demanding service environments. Their alloy-based performance supports strength, ductility, and stability across standard bolt, nut, and screw sizes, with compliance to applicable dimensional requirements as specified.
| Property | Value |
|---|---|
| Tensile Strength | 586 MPa min |
| Yield Strength (0.2% Offset) | 241 MPa min |
| Elongation | 30% min |
| Hardness | ≤ 200 HB |
| Modulus of Elasticity | 196 GPa |
| Thermal Expansion (20–100°C) | 14.0 x10⁻⁶/°C |
| Thermal Conductivity | 11.1 W/m·K |
| Density | 8.14 g/cm³ |
| Melting Range | 1370–1400°C |
| Maximum Service Temperature | 550°C |
| Standard/Feature | Details |
|---|---|
| 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 – M100 / 1/4" – 4" |
| Length Range | 10mm – 500mm |
| Available Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Manufacturing Standards | ASTM B564, ASME SB564 |
Applications
