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Inconel 718/825 fasteners are high-performance nickel-chromium alloy fasteners known for their exceptional resistance to heat and corrosion. These fasteners are widely used in industries where durability under extreme conditions is essential.
Manufactured from Inconel 718/825, these fasteners offer superior mechanical strength, making them ideal for high-stress applications. They maintain structural integrity even at elevated temperatures, ensuring reliable performance in critical systems.
The corrosion resistance of Inconel 718/825 fasteners makes them suitable for use in chemical processing plants, marine environments, and applications exposed to oxidizing agents. They withstand oxidation and corrosion where standard stainless steels may fail.
These fasteners are available in a variety of types, including bolts, nuts, screws, studs, and washers, catering to diverse industrial requirements. Custom sizes and threads can also be produced to meet specific engineering specifications.
Inconel 718/825 fasteners are widely utilized in the aerospace and power generation sectors due to their ability to perform reliably under extreme thermal and mechanical stresses. They are often used in turbine engines, heat exchangers, and exhaust systems.
The material’s resistance to scaling at high temperatures ensures long service life, reducing maintenance costs and downtime. Inconel 718/825 fasteners are also capable of withstanding repeated thermal cycling without degradation.
These fasteners are precision-engineered to meet international standards such as ASTM, ASME, and ISO. Compliance with these standards guarantees consistency, quality, and reliability in critical applications.
Inconel 718/825 fasteners are often chosen for applications in the petrochemical and oil & gas industries, where exposure to aggressive chemicals and high-pressure conditions is common. Their strength and corrosion resistance make them indispensable in such environments.
Specification Table
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Alloy Type | Nickel-Chromium-Iron Alloy | Nickel-Iron-Chromium Alloy |
| ASTM / AMS Standards | ASTM B637, AMS 5662, AMS 5596 | ASTM B425, AMS 5699 |
| Applications | Aerospace, turbines, high-temperature structural components | Chemical, marine, oil & gas, seawater resistant fasteners |
| Forms Available | Bolts, Nuts, Studs, Washers, Screws | Bolts, Nuts, Studs, Washers, Screws |
| Heat Treatment | Solution treated & Age hardened | Annealed |
| Surface Finish | Passivated, Black Oxide, Zinc/Nickel Plated (optional) | Passivated, Bright, Zinc/Nickel Plated (optional) |
| Corrosion Resistance | Excellent in high-temperature oxidizing environments | Superior in reducing and oxidizing environments, seawater, chemical exposure |
| Temperature Range | -252°C to 704°C (-422°F to 1300°F) | -200°C to 600°C (-328°F to 1112°F) |
| Ultimate Tensile Strength | 965–1,275 MPa (140–185 ksi) | 485–690 MPa (70–100 ksi) |
| Yield Strength | 690–1,275 MPa (100–185 ksi) | 240–380 MPa (35–55 ksi) |
| Elongation | 12–20% | 30–50% |
| Hardness | 95 HRB / 35 HRC | 85 HRB |
| Density | 8.19 g/cm³ | 8.43 g/cm³ |
Chemical Composition (Typical ranges for SS718/825)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Inconel 718 (wt%) | Inconel 825 (wt%) | |||
|---|---|---|---|---|---|
| Nickel (Ni) | 50–55% | 38–46% | |||
| Chromium (Cr) | 17–21% | 19.5–23.5% | |||
| Iron (Fe) | Balance (~18%) | 28–34% | |||
| Cobalt (Co) | ≤1% | ≤2% | |||
| Molybdenum (Mo) | 2.8–3.3% | 2.5–3.5% | |||
| Niobium + Tantalum (Nb+Ta) | 4.75–5.5% | 0.4–1.0% | |||
| Copper (Cu) | ≤0.3% | ≤1% | |||
| Titanium (Ti) | 0.65–1.15% | ≤0.6% | |||
| Aluminum (Al) | 0.2–0.8% | 0.2–0.8% | |||
| Manganese (Mn) | ≤0.35% | ≤1% | |||
| Silicon (Si) | ≤0.35% | ≤0.5% | |||
| Carbon (C) | ≤0.08% | ≤0.05% | |||
| Phosphorus (P) | ≤0.015% | ≤0.03% | |||
| Sulfur (S) | ≤0.015% | ≤0.03% | Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Ultimate Tensile Strength (MPa) | 965–1,275 | 485–690 |
| Yield Strength (MPa) | 690–1,275 | 240–380 |
| Elongation (%) | 12–20 | 30–50 |
| Hardness | 95 HRB / 35 HRC | 85 HRB |
| Modulus of Elasticity (GPa) | 207 | 200 |
| Shear Strength (MPa) | 550–750 | 310–480 |
| Creep Rupture Strength (MPa) | 620 @ 650°C (1,142°F) | Approx. 170–200 @ 538°C (1,000°F) |
| Fatigue Strength (MPa) | 480–620 | 250–350 |
| Density (g/cm³) | 8.19 | 8.43 |
Equivalent Grades
| Material | ASTM | AMS | UNS | EN / DIN |
|---|---|---|---|---|
| Inconel 718 | B637, B564 | AMS 5662, AMS 5596 | NO7718 | 2.4668 / X5NiCrTiNb18-9-5 |
| Inconel 825 | B425 | AMS 5699 | UNS N08825 | 2.4858 / X2NiCrMoN17-13-5 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Diameter (mm) | Length (mm) | Thread Pitch (mm) | Weight per 100 pcs (kg) - Inconel 718 | Weight per 100 pcs (kg) - Inconel 825 |
|---|---|---|---|---|
| M6 | 12–100 | 1.0 | 2.5–15 | 2.6–15.5 |
| M8 | 16–120 | 1.25 | 5–30 | 5.2–31 |
| M10 | 20–150 | 1.5 | 9–45 | 9.3–46 |
| M12 | 25–200 | 1.75 | 15–90 | 15.5–92 |
| M16 | 30–250 | 2.0 | 30–150 | 31–155 |
| M20 | 40–300 | 2.5 | 55–280 | 56–285 |
| M24 | 50–350 | 3.0 | 85–450 | 87–460 |
Common Types Of Fasteners
Bolts
Nuts
Steel Screw
Washer
Stud Bolts
Frequently Asked Questions (FAQ)
What are Inconel 718 and 825 fasteners?
Inconel 718 and 825 fasteners are high-performance nickel-chromium-based alloy bolts, nuts, screws, studs, and washers designed for extreme temperature and corrosive environments. 718 is age-hardenable with high tensile strength, while 825 provides excellent resistance to chemical corrosion.
Where are Inconel 718/825 fasteners commonly used?
They are widely used in aerospace, marine, oil & gas, chemical processing, power generation, and high-temperature industrial applications.
What standards do these fasteners comply with?
Inconel 718 fasteners typically comply with ASTM B637, AMS 5662, and AMS 5596. Inconel 825 fasteners meet ASTM B425 and AMS 5699 standards.
Can these fasteners be custom-made?
Yes, Inconel 718 and 825 fasteners can be manufactured to custom dimensions, drawings, and specifications, including special threads, lengths, and finishes.
What is the temperature range for these fasteners?
Inconel 718: -252°C to 704°C (-422°F to 1300°F), Inconel 825: -200°C to 600°C (-328°F to 1112°F).
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