Inconel 718 CoilASTM B670 UNS N07718 · Manufacturer, trader & exporter, India
Also sold as Alloy 718 · UNS N07718 · W.Nr 2.4668 · Precipitation-hardening nickel alloy
Inconel 718 coil is supplied as full-width mother coil, slit coil or precision strip to ASTM B670. It is a age-hardenable nickel–chromium alloy with niobium and molybdenum, chosen for very high strength at temperatures up to about 650 °C. Kanak Steel & Engineering Co. manufactures, trades and exports it from Mumbai; EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on request
- NACE MR0175 on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is Inconel 718 Coil?
Inconel 718 coil is an age-hardenable nickel–chromium alloy with niobium and molybdenum supplied as coil to ASTM B670 (UNS N07718). Buyers specify it for very high strength at temperatures up to about 650 °C. It is also sold as Alloy 718, UNS N07718, W.Nr 2.4668.
- What it is
- Age-hardenable nickel–chromium alloy with niobium and molybdenum
- Standard
- ASTM B670
- Forms
- Mother coil · slit coil · strip
- Density
- 8.19 g/cm³
- Finish
- Cold rolled, annealed & descaled
- Best at
- Very high strength at temperatures up to about 650 °C
Inconel 718 Coil Specification & Sizes
| Material standard | ASTM B670 |
|---|---|
| Grade | Inconel 718 |
| Thickness | 0.1 mm to 6 mm, depending on mill route |
| Width | Mill width, or slit from 10 mm upwards |
| Coil weight & ID | To order — state maximum coil weight and inner diameter |
| Finish | Cold rolled, annealed & descaled; bright annealed on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Inconel 718 Coil: Slitting & Cut-to-Length Specification
718 coil is bought for a production line, so state thickness, slit width, inner diameter and maximum coil weight with the grade.
| Standard | ASTM B670 |
|---|---|
| Thickness tolerance | Per ASTM B906 |
| Finish | Cold rolled, annealed & descaled · bright annealed on request |
| Temper | Annealed as standard; cold-rolled tempers by agreement |
ID, coil weight, edge, camber and interleaving: see the coil guide.
Inconel 718 Coil Chemical Composition
| Element | Weight % (producer reference) |
|---|---|
| Nickel (+Co) | 50.00 – 55.00 |
| Chromium | 17.00 – 21.00 |
| Iron | Balance |
| Niobium (+Ta) | 4.75 – 5.50 |
| Molybdenum | 2.80 – 3.30 |
| Titanium | 0.65 – 1.15 |
| Aluminium | 0.20 – 0.80 |
| Cobalt | 1.00 max |
| Carbon | 0.08 max |
| Manganese | 0.35 max |
| Silicon | 0.35 max |
| Phosphorus | 0.015 max |
| Sulphur | 0.015 max |
| Boron | 0.006 max |
| Copper | 0.30 max |
Inconel 718 Coil Mechanical Properties
| Specification | Product form | Condition | Requirement values |
|---|---|---|---|
| ASTM B670 (B670-25) | plate, sheet, strip | annealed (per current scope) | As specified |
Numerical requirements are not shown until the current edition of each standard has been verified. Mechanical properties depend on product form, size, condition and heat treatment — state them on the purchase order.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ |
| Melting range | 1260 – 1336 °C |
| Magnetic | Non-magnetic |
Typical / reference values (producer data, Special Metals SMC-045) — not specification requirements.
Inconel 718 Equivalent Grades
Values follow Special Metals INCONEL alloy 718 bulletin SMC-045 (2007) — producer reference composition, not a specification requirement; specification limits in ASTM B637-26, B670-25 and A1014/A1014M-26 are pending current standard text. Always check against the edition named on your purchase order.
Six-digit Harmonized System heading (nickel alloy, chapter 75). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify Inconel 718 Coil with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. Inconel 718 is most often mixed up with Inconel 625 — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen; those come from the mill certificate or optical emission (OES) testing. PMI can be arranged on request — state it on your enquiry.
Under technical review for TDS.
| Element | Inconel 718 (producer reference) | Inconel 625 |
|---|---|---|
| Nickel | 50.00 – 55.00 | As specified |
| Chromium | 17.00 – 21.00 | As specified |
| Molybdenum | 2.80 – 3.30 | As specified |
| Copper | 0.30 max | — |
| Titanium | 0.65 – 1.15 | As specified |
| Niobium | 4.75 – 5.50 | As specified |
| Iron | Balance | As specified |
| Manganese | 0.35 max | As specified |
Inconel 718 Coil Applications
Inconel 718 is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
Inconel 718 Coil vs 625, 600 and 825
| Grade | Coil standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| Inconel 600 | ASTM B168 | — | High-temperature oxidation, caustic and nuclear service |
| Inconel 718 | ASTM B670 · AMS 5596 | — | Very high strength at temperatures up to about 650 °C |
| Inconel 825 | ASTM B424 | ≈ 31 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| Inconel 625 | ASTM B443 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
Inconel 718 Corrosion Resistance — Element by Element
Each alloying addition has a job. Knowing which one protects against your medium is the quickest way to judge whether 718 fits.
Niobium forms the gamma-double-prime precipitate that gives 718 its high strength after age hardening.
Keeps very high strength and creep resistance up to about 650 °C.
Its slow ageing response gives good resistance to strain-age cracking during post-weld heat treatment; welding procedure and post-weld treatment still follow the applicable code and specification.
718 is chosen for strength; for corrosion alone, 625 or 825 are usually better value.
How your 718 coil order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI can be arranged depending on product and requirements, as specified in the PO.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked as specified in the PO.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Welding & Fabricating Inconel 718 Coil
Inconel 718 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ERNiFeCr-2 (AWS A5.14) |
|---|---|
| Over-alloyed filler | Post-weld solution treatment and ageing restore strength |
| Preheat | Not required; keep interpass temperature low |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also 718 fittings and 718 flanges for the matching pipe-system parts.
How to Order Inconel 718 Coil: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Thickness and width
- Coil weight and inner diameter
- Finish and edge (mill or slit)
- Certificate type
- Delivery port and date
Inconel 718 coil — questions buyers ask
Is Inconel 718 the same as Alloy 718?
Alloy 718, UNS N07718, W.Nr 2.4668 are names used for Inconel 718 (W.Nr / EN numbers and older UNS variants are the closest designations; their limits can differ slightly, so specify the UNS number and ASTM grade on the order), and coil is ordered to ASTM B670 whichever name is on the enquiry.
Can Inconel 718 coil be slit to width?
Yes. Coils can be slit to narrow widths for stamping, tube making and spring work; state width tolerance and coil weight on the enquiry.
What inner diameter do Inconel 718 coils have?
508 mm (20") and 610 mm (24") are the common IDs. Tell us your decoiler ID and maximum coil weight and we slit to suit.
Can I order Inconel 718 cut-to-length sheets from coil?
Yes. Coil can be levelled and cut to length; state length tolerance and flatness.
Can Inconel 718 coil be supplied to NACE MR0175?
Inconel 718 (UNS N07718) can be supplied for sour service when the PO specifies NACE MR0175 / ISO 15156; acceptability depends on the material condition, hardness and the environmental limits in that standard, which the purchaser must confirm for the application.
Inconel 718 or Inconel 825 — which should I choose?
Inconel 718 is chosen for very high strength at temperatures up to about 650 °C. Inconel 825 is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026