Inconel 718 Fittings Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies inconel 718 fittings (N07718, Werkstoff 2.4668) from ready stock in Mumbai, to customers across India and in more than 40 export markets.
Fittings carry the same corrosion duty as the pipe they join but see higher stress concentration at every change of direction, so grade traceability and wall thickness at the extrados matter more here than anywhere else in a piping system.
Inconel 718 age-hardens slowly enough to be welded and then heat treated without strain-age cracking, which is why it is the most-used superalloy in the world.
Sizes and Specifications
| Grade | Inconel 718 |
|---|---|
| UNS number | N07718 |
| Werkstoff (W.Nr.) | 2.4668 |
| Specifications | ASTM B637 (rod, bar and wire), B670 (plate, sheet and strip), AMS 5662/5663 |
| Size range | Butt-weld fittings 1/2" to 48" NB in Sch 5S to Sch XXS; forged socket-weld and threaded fittings 1/8" to 4" NB in 3000#, 6000# and 9000# classes. |
| Condition and finish | Elbows (45° and 90°, long and short radius), tees (equal and reducing), reducers (concentric and eccentric), caps, stub ends, couplings, unions, plugs and bushings. |
| Certification | EN 10204 3.1 mill test certificate; 3.2 and third-party inspection on request |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N07718 |
| Werkstoff / EN number | 2.4668 |
| Density | 8.19 g/cm3 |
| Melting range | 1260-1336 °C |
| Density (annealed and aged) | 0.297 lb/in³ (bulletin publishes no SI value for this condition) |
| Specific heat (21 °C) | 435 J/kg·°C |
| Curie temperature (annealed) | < -196 °C |
| Curie temperature (annealed and aged) | -112 °C |
| Magnetic permeability (200 oersted at 21 °C - annealed) | 1.0013 |
| Magnetic permeability (200 oersted at 21 °C - annealed and aged) | 1.0011 |
| Fittings specification | ASTM B366 |
Identifiers and physical constants for Inconel 718. A dash means no such designation is published for this grade.
Chemical Composition
Nickel 50-55% with 17-21% chromium, 4.75-5.5% niobium, 2.8-3.3% molybdenum plus titanium and aluminium. Strengthening comes from gamma-double-prime precipitation on ageing.
| Element | Min (%) | Max (%) |
|---|---|---|
| Ni+Co | 50.0 | 55.0 |
| Chromium (Cr) | 17.0 | 21.0 |
| Iron (Fe) | — | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 | 5.50 |
| Molybdenum (Mo) | 2.80 | 3.30 |
| Titanium (Ti) | 0.65 | 1.15 |
| Aluminium (Al) | 0.20 | 0.80 |
| Cobalt (Co) | — | 1.0 |
| Copper (Cu) | — | 0.30 |
| Carbon (C) | — | 0.08 |
| Manganese (Mn) | — | 0.35 |
| Silicon (Si) | — | 0.35 |
| Phosphorus (P) | — | 0.015 |
| Sulfur (S) | — | 0.015 |
| Boron (B) | — | 0.006 |
Composition limits for Inconel 718. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical and Physical Properties
Solution treated and aged tensile strength reaches 1275 MPa with yield above 1030 MPa. The sluggish ageing response makes it weldable and resistant to post-weld cracking.
Industry Applications
Why this grade
Inconel 718 is age-hardenable, strengthened by gamma double-prime precipitation on ageing rather than by solid solution alone. That gives it high strength up to around 700°C together with good weldability, which is the combination that put it into turbine discs, shafts, fasteners and downhole hardware. Above that temperature the strengthening phase coarsens and a solid-solution grade such as 617 takes over.
| Industry | Typical use |
|---|---|
| Aerospace | Turbine discs, shafts, casings, blades and fasteners. |
| Oil and gas | Downhole tools, wellhead components and sour-service fasteners to NACE MR0175. |
| Power generation | Land-based gas-turbine rotating and static hardware. |
| Nuclear | Springs, fasteners and reactor hardware. |
| Motorsport | Exhaust systems, valves and high-load fasteners. |
Testing and Certification
Every consignment ships with an EN 10204 3.1 mill test certificate stating heat number, chemical analysis and mechanical properties. Depending on the specification we can add positive material identification, ultrasonic and dye-penetrant testing, intergranular corrosion testing to ASTM G28 or A262, hydrostatic testing, and third-party inspection release from Lloyd's Register, Bureau Veritas, SGS or TUV.
Aurico Alloys LLP operates an ISO 9001:2015 quality management system, and can certify material to NACE MR0175 / ISO 15156 for sour service where the grade permits.
Frequently Asked Questions
Request a Quotation
Send your size, quantity and specification and we will come back with price and lead time, usually the same working day. Call +91 7977 88 6611 or email info@auricoalloys.com.