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| UNS Number | N09925 |
|---|---|
| ASTM/ASME Standard | ASTM B805 / ASME SB805 |
| Tensile Strength | ≥1035 MPa |
| Yield Strength | ≥690 MPa |
| Density | 8.14 g/cm³ |
| Max Service Temperature | 600°C |
| Element | Composition (%) |
|---|---|
| Ni | 42.0–46.0 |
| Cr | 19.5–22.5 |
| Mo | 2.5–3.5 |
| Cu | 1.5–3.0 |
| Ti | 1.9–2.4 |
| Al | 0.1–0.5 |
| Fe | bal |
| C | ≤0.03 |
Incoloy 925 Fasteners derive their exceptional performance from a carefully balanced composition of nickel, iron, chromium, molybdenum, titanium and copper. Nickel and iron form a stable austenitic matrix, while chromium provides oxidation and corrosion resistance. Molybdenum enhances resistance to pitting and crevice corrosion, particularly in chloride-rich environments, while titanium and aluminum enable age-hardening through the precipitation of gamma-prime strengthening phases, significantly boosting mechanical strength without compromising ductility.
This unique combination delivers outstanding corrosion resistance, high strength and excellent toughness across a wide temperature range, making Incoloy 925 Fasteners ideal for demanding applications. Their resistance to stress corrosion cracking, sulfide stress cracking and hydrogen embrittlement makes them particularly suitable for oil and gas, marine, and chemical processing environments. The alloy’s ability to maintain mechanical integrity under high mechanical loads and corrosive conditions ensures long-term reliability, reduced maintenance costs and enhanced safety in critical bolting applications.
Specifications
Incoloy 925 Fasteners combine corrosion-resistant alloy performance with precise dimensional specifications, mechanical strength, and technical data suited for demanding service environments. Designed around tensile, hardness, and size requirements, they are defined by reliable mechanical properties and controlled dimensions for consistent installation and performance.
| Property | Value |
|---|---|
| Tensile Strength | 1035–1200 MPa |
| Yield Strength (0.2% Offset) | 690–825 MPa |
| Elongation | ≥20% |
| Reduction of Area | ≥35% |
| Hardness | 28–35 HRC |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion (20–100°C) | 13.5 µm/m·°C |
| Thermal Conductivity | 11.2 W/m·K |
| Density | 8.14 g/cm³ |
| Melting Range | 1350–1400°C |
| Heat Treatment | Solution + Age Hardening |
| Max Service Temperature | 600°C |
| Specification | 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 B805, ASME SB805 |
| Inspection Standards | NACE MR0175, EN 10204 3.1 |
| Surface Finish | Passivated / Bright Finish |
Applications
