We are Riddhi Siddhi Impex, a Mumbai-based supplier and stockist of Inconel 718 Coils, established in 2002. We hold a ready stock of this precipitation-hardening superalloy to ASTM B670 / ASME SB-670 in gauges from 0.03 mm to 5 mm, custom-slit width to ±0.1 mm tolerance. Our ISO 9001, 14001, and 45001-certified company maintains a supply capacity of 400-500 tonnes monthly, with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Inconel 718 coils are flat-rolled nickel-chromium superalloy stock that gains strength from heat treatment rather than cold work. Niobium promotes the formation of gamma double-prime (γ″) precipitates during ageing, lifting tensile strength past 1240 MPa. The alloy retains high strength up to about 650 °C, stays tough at cryogenic temperatures, and carries a density of 8.19 g/cm³. Inconel 718 coils are typically used to manufacture gas turbine parts, aerospace components, and high-strength fasteners for extreme environments.
As a reliable Inconel 718 coil supplier, we stock Inconel coils rather than produce them, sourcing parent coils from reputed primary mills and slitting to width in-house. Material ships solution annealed, so blanks and pressings form cleanly before ageing to full hardness.
We provide Alloy 718 coils to ASTM B670 and both aerospace specifications in the solution-annealed condition, slit from ready stock to the dimensions below.
| Parameter | Details |
|---|---|
| Standard | ASTM B670 / ASME SB-670 |
| Aerospace Specification | AMS 5596 (solution treated), AMS 5597 (solution treated) |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm (post-slit) |
| Width Tolerance | ±0.1 mm |
| Coil ID | 150 mm to 610 mm |
| Coil OD | Up to 1800 mm |
| Condition | Solution annealed (standard mill) |
| Surface Finish | BA (Bright Annealed), 2B |
| Edge | Mill edge, Slit edge, Deburred edge, Round edge |
Niobium, at 4.75 to 5.50 percent, is the critical element that sets Inconel 718 apart, forming the gamma double-prime (γ") phase that delivers the alloy's high strength upon ageing. The full ASTM B670 chemical composition limits follow.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 50.0 to 55.0 |
| Chromium (Cr) | 17.0 to 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 to 5.50 |
| Molybdenum (Mo) | 2.80 to 3.30 |
| Titanium (Ti) | 0.65 to 1.15 |
| Aluminium (Al) | 0.20 to 0.80 |
| Cobalt (Co) | 1.00 max |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Copper (Cu) | 0.30 max |
| Boron (B) | 0.006 max |
| Phosphorus (P) | 0.015 max |
| Sulphur (S) | 0.015 max |
A precipitation reaction, not rolling, decides the strength of Nickel Alloy 718 coils. Our stock ships solution annealed at 830 to 965 MPa tensile, soft enough to stamp, draw, and weld. Aging after fabrication lifts it to 1240 MPa minimum tensile with 1035 MPa yield per AMS 5596.
| Condition | Tensile Strength (MPa) | Yield Strength (0.2% Offset) | Rockwell Hardness |
|---|---|---|---|
|
Solution Annealed
|
830 to 965 | 380 MPa | 100 HRB max |
|
Precipitation Hardened (Aged)
|
1240 min | 1035 MPa | 36 to 47 HRC |
Buyers who order by a regional designation can match UNS N07718 coils below, from Werkstoffnummer 2.4668 to NCF 718 and GH4169.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N07718 |
| Europe (EN) | NiCr19Fe19Nb5Mo3 |
| Germany (W.Nr.) | 2.4668 |
| Japan (JIS) | NCF 718 |
| China (GB) | GH4169 |
Leading Inconel 718 distributors supply to these 4 major industries, each buying strength that outlasts heat, pressure, and fatigue.
Aerospace fabricators blank IN718 coil into engine seals, brackets, and heat shields. We supply this material to AMS 5596 in the solution-annealed coil format so it uncoils flat and presses cleanly without cracking; finished components are then heat-treated to meet AMS 5597 properties. Through thermal cycling to about 650 °C, the finished hardware retains its strict fatigue resistance.
Downhole springs, wellhead seals, and packer components are stamped from Inconel 718 coil for sour-service duty. The aged material resists sulphide stress cracking in corrosive well fluids. Its yield strength stays above 1035 MPa under downhole pressure where standard stainless steels lose strength.
Gas turbine builders slit Alloy 718 coil into diaphragm segments, sealing rings, and combustor hardware. Creep resistance holds dimensions steady across long firing campaigns. Thin sections also shrug off oxidation in combustion atmospheres that scale ordinary heat-resistant coil grades.
Process plants form Nickel Alloy 718 coils into reactor internals, valve trim, and spring stock that face both load and corrosion. The grade isn't the pick for hot sulphuric acid duty; buyers who rank wet-corrosion resistance above strength should consider Inconel 625 Coils instead.
We dispatch Inconel 718 coils from Mumbai and Taloja, packed in wooden cases or on pallets.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai and Taloja warehouses |
| Standard Lead Time | 4 to 5 days |
| Urgent Dispatch | 2 to 3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 on request |
Inconel 718 coils in India typically cost around ₹1,100-₹3,200 per kg, while export buyers generally pay about $15-$46 per kg depending on thickness, finish, and order size. These indicative figures track nickel and niobium markets, and thickness, width, finish, and quantity shift them. Volume discounts apply, so call or WhatsApp us for today's rate.
Inconel 718 coils price in India is around ₹1,100 to ₹3,200 per kg, while export buyers generally pay about $15 to $46 per kg, depending on gauge, finish, and quantity. quantity, and nickel market movement. Request a quote for the current rate.
We supply Inconel 718 coils in thicknesses from 0.03 mm to 5 mm and widths from 3 mm to 2000 mm (post-slit), slit to ±0.1 mm, with coil ID of 150 mm to 610 mm and OD up to 1800 mm.
Inconel 718 coils are covered by ASTM B670 / ASME SB-670 for flat products, with AMS 5596 and AMS 5597 for solution treated supply. ASTM B637 applies to bars and forgings, not coil.
No, Inconel 718 coils are not magnetic in the solution-annealed condition. The stable austenitic structure suits instrumentation parts, sensor housings, and downhole tools working near electromagnetic equipment.
Inconel 718 coils reach 1240 MPa tensile after ageing, well above solid-solution Inconel 625. Alloy 625 welds more easily and resists wet corrosion better, so it suits marine and chemical duty while 718 takes high-load, high-temperature work.
You can source Inconel 718 Coils in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds N07718 coil stock ready for dispatch. As a supplier, stockist, and exporter, we serve buyers across India and overseas, with quotes within 24 hours on call or WhatsApp.
