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Inconel 718 Fasteners Supplier in Mumbai, India – Bolts and Nuts
Nicorex Alloys is a supplier of Inconel 718 fasteners in Mumbai, India. Inconel 718 is a high-strength nickel alloy that is precipitation hardened. It typically contains 50–55% nickel, 17–21% chromium, about 17% iron, and 4.75–5.50% niobium, along with other alloying elements.
It achieves a yield strength of 150 ksi (1034 MPa) through a special double-phase ageing process involving γ″ (Ni₃Nb) and γ′ (Ni₃(Al, Ti)) phases. This treatment allows each Inconel 718 bolt to provide a very high clamp load and reliable performance. Because of its strength and stability, Inconel 718 is widely used in demanding applications such as high-pressure wellheads, aerospace gas turbines, and nuclear reactor vessels, especially where reducing bolt count and flange size is important. Inconel 718 (UNS N07718, Werkstoff 2.4668) is a high-strength nickel alloy fastener material. These fasteners are supplied to ASTM B637 (not ASTM F468).
In the solution-treated condition (Class 1), they provide a minimum tensile strength of 862 MPa (125 ksi) and a yield strength of 517 MPa (75 ksi). In the solution-treated and aged condition (Class 2), the minimum tensile strength is 1241 MPa (180 ksi) and the yield strength is 1034 MPa (150 ksi), with hardness limited to 40 HRC. Available products include Inconel 718 hex bolts, stud bolts, socket head cap screws (SHCS), nuts, lock nuts, screws, washers, threaded rods, U-bolts, and eye bolts. Standard sizes range from M6 to M100, which is about 1/4 inch to 4 inches. These fasteners are listed for use in sour service under NACE MR0175 / ISO 15156-3 and are suitable for temperatures from -253°C to 700°C (up to 1300°F). Production and quality systems are typically ISO 9001 and ISO 14001 certified.
Inconel 718 Fastener Specifications
| Standard | ASTM B637 / ASME SB-637 |
|---|---|
| Forms | Bolts, Nuts, Screws, Washers, Studs, Threaded Rods, Hex Bolts, Socket Head Cap Screws, Hex Nuts, Lock Nuts, Stud Bolts |
| Size | M6 – M100 (Metric); 1/4″ – 4″ (Imperial) |
| Length | 3 mm – 200 mm; Custom lengths available |
| Diameter | M6 – M100 (Metric); 1/4″ – 4″ (Imperial) |
| Thread Types | UNC, UNF, Metric Coarse, Metric Fine, BSW, BSF |
| Surface Finishes | Bright Finish, Pickled, Passivated, Hot-Dip Galvanized, Electropolished |
| Available Conditions | Solution Annealed, Precipitation Hardened (Aged) |
Chemical Composition of Inconel 718 Fasteners
| Element | Nickel (Ni + Co) | Chromium (Cr) | Iron (Fe) | Niobium + Tantalum (Nb+Ta) | Molybdenum (Mo) | Titanium (Ti) | Aluminium (Al) | Carbon (C) | Boron (B) |
|---|---|---|---|---|---|---|---|---|---|
| Composition (%) | 50.0–55.0 | 17.0–21.0 | Balance (~17) | 4.75–5.50 | 2.80–3.30 | 0.65–1.15 | 0.20–0.80 | 0.08 max | 0.006 max |
The 5% Nb + Ti + Al combination is what enables precipitation hardening via γ″ (Ni₃Nb) and γ′ (Ni₃(Al, Ti)) phases. No other standard-production nickel alloy achieves both precipitate phases simultaneously. The ~17% Fe (vs 5% in 625) reduces raw material cost while maintaining strength after ageing.
Mechanical Properties of Inconel 718 Fasteners
| Property | Tensile Strength (min) | Yield 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| Class 1 (SA) | 862 MPa (125 ksi) | 517 MPa (75 ksi) | 30% | – |
| Class 2 (SA + Aged) | 1241 MPa (180 ksi) | 1034 MPa (150 ksi) | 12% | 40 HRC |
Inconel 718 Fastener Equivalent Grades
| Standard System | UNS | Werkstoff Number | DIN | EN | JIS | GOST | AFNOR |
|---|---|---|---|---|---|---|---|
| Equivalent Grade | N07718 | 2.4668 | NiCr19Fe19NbMo3 | NiCr19Fe19NbMo3 | NCF 718 | ХН45МВТЮБР | NC19FeNb |
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Types of Inconel 718 Fasteners Available
Inconel 718 Hex Bolts
Inconel 718 Stud Bolts
Inconel 718 Socket Head Cap Screws
Inconel 718 Hex Nuts
Inconel 718 Lock Nuts
Inconel 718 Flat Washers
Inconel 718 Threaded Rods
Inconel 718 U-Bolts
Inconel 718 Set Screws
Inconel 718 Eye Bolts
Surface Finish and Coating Options
- Plain: Standard (most common for 718)
- Passivated: Acid passivation per ASTM A967
- Silver Plated: Anti-seize for elevated-temp bolting
- Cadmium Plated: Aerospace applications (per QQ-P-416)
- MoS₂ Dry Film: Lubrication for aerospace fasteners
- Anti-Seize: Nickel-based or silver-based for high-temp
CRITICAL: Hydrogen embrittlement risk exists with electroplating on precipitation-hardened 718. Bake at 190°C within 4 hours of plating per ASTM B849.
Industries and Applications for Inconel 718 Fasteners
- Aerospace and Gas Turbines: Turbine disc bolts, compressor blade retention, combustor casing studs, afterburner hardware, 12-point flange bolts for engine casings. AMS 5663 controls. VIM+VAR or triple-melt (VIM+ESR+VAR) required.
- Oil and Gas (Upstream) and Wellhead Bolting: Wellhead/Christmas tree stud bolts per API 6A 718, BOP bolting, tubing hanger fasteners, HPHT well equipment, subsea manifold bolts. NACE MR0175 compliant at ≤40 HRC.
- Nuclear: Reactor pressure vessel studs and steam generator bolts provide secure, long-lasting clamping in critical nuclear systems.
- Cryogenic/LNG: Fasteners on LNG terminal equipment and cryogenic valve bonnets keep joints secure down to -253°C.
- Power Generation: Gas turbine hot-section bolting and steam turbine casing studs withstand extreme temperatures and cyclic stresses reliably.
- Motorsport/Defence: High-performance fasteners deliver reliable, lightweight clamping under intense vibration, shock loading, and thermal cycling demands.
How to Order Inconel 718 Fasteners from Nicorex Alloys
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Fastener Type - Hex Bolt, Stud Bolt, Socket Head Cap Screw, Nut, Washer, Threaded Rod, Anchor Bolt
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Size - Diameter × Length in mm or inches
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Thread Type - UNC, UNF, BSW, Metric Coarse/Fine
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Material Grade - Inconel 718 / UNS N07718
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Standard - ASTM F468 / ASTM F467 / ASME SA193 B637 / AMS 5662/5663
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Finish - Bare, Passivated, Pickled
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Condition - Solution Annealed & Precipitation Hardened
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Quantity - Number of Pieces or kg
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Additional Requirements - NACE MR0175 compliance, API 6A, specific heat numbers, aerospace/oilfield service
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Documentation - MTC 3.1 per EN 10204, PMI report, third-party inspection certificate
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Packaging - Standard wooden box / export-grade sea-worthy packing / ISPM 15 compliant
- Delivery Destination - Domestic / International
Frequently Asked Questions
Why is Inconel 718 the strongest Nickel Alloy Fastener?
Is Hydrogen Embrittlement a concern with 718 Fasteners?
Yes. Precipitation-hardened 718 at >35 HRC can absorb hydrogen during electroplating or cathodic protection. Bake at 190°C within 4 hours of plating (ASTM B849). Control hardness ≤40 HRC for sour/subsea service. Avoid excessive cathodic protection potentials.
Can Inconel 718 be used at cryogenic temperatures?
Yes. 718 retains excellent ductility and Charpy impact toughness down to -253°C (-423°F). It is the standard material for liquid hydrogen and LNG bolting. Impact resistance actually improves at cryogenic temperatures compared to room temperature.