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| Specification | Value |
|---|---|
| UNS Number | N06625 |
| ASTM/ASME Standard | ASTM B446 / ASME SB446 |
| Tensile Strength | 827 MPa min |
| Yield Strength | 414 MPa min |
| Density | 8.44 g/cm³ |
| Max Service Temperature | 980°C |
| Element | Composition (%) |
|---|---|
| Ni | ≥58.0 |
| Cr | 20.0–23.0 |
| Mo | 8.0–10.0 |
| Nb+Ta | 3.15–4.15 |
| Fe | ≤5.0 |
| C | ≤0.10 |
| Mn | ≤0.50 |
| Si | ≤0.50 |
Inconel 625 fasteners derive their exceptional performance from a nickel-chromium-molybdenum matrix strengthened by niobium additions. Chromium provides excellent oxidation and corrosion resistance, while molybdenum enhances resistance to pitting and crevice corrosion in reducing environments. Niobium contributes to solid-solution strengthening and stabilizes the alloy against sensitization during welding, preventing carbide precipitation at grain boundaries. This carefully balanced composition eliminates the need for extensive precipitation-hardening heat treatments, allowing the alloy to achieve high strength through solid-solution mechanisms alone, which simplifies manufacturing while maintaining consistent mechanical properties.
These metallurgical characteristics translate into fasteners with outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive chloride and acidic environments. Excellent fatigue strength, high-temperature stability up to 980°C, and resistance to oxidation make Inconel 625 fasteners ideal for aerospace, marine, chemical processing, and oil and gas applications where reliability under extreme thermal and corrosive conditions is essential for long-term structural integrity.
Specifications
Inconel 625 Fasteners are high-performance nickel-based components defined by their mechanical properties, dimensional specifications, and technical data for demanding service conditions. Their corrosion resistance, strength, and temperature capability support reliable fastening performance across standard sizes, thread forms, and application-specific requirements.
| Property | Value |
|---|---|
| Tensile Strength | 827–1000 MPa |
| Yield Strength (0.2% Offset) | 414–517 MPa |
| Elongation | 30–50% |
| Hardness | Max 220 HB / 35 HRC |
| Modulus of Elasticity | 207.5 GPa |
| Thermal Expansion (20–100°C) | 12.8 µm/m·°C |
| Thermal Conductivity | 9.8 W/m·K |
| Density | 8.44 g/cm³ |
| Melting Range | 1290–1350°C |
| Max Service Temperature | 980°C |
| Standard/Parameter | 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 (ISO) |
| Diameter Range | M6 to M100 / 1/4" to 4" |
| Length Range | 10mm to 500mm (custom available) |
| Available Product Forms | Hex Bolts, Studs, Nuts, Washers, Socket Screws |
| Manufacturing Standards | ASTM B446, AMS 5666 |
| Inspection Standards | NACE MR0175, PMI Testing, RT/UT |
Applications
