Inconel 718 — Sheet, Plate, Coil, Pipe & Tube & Fittings
Also sold as Alloy 718 · UNS N07718 · W.Nr 2.4668 · Precipitation-hardening nickel alloy
Inconel 718 is a age-hardenable nickel–chromium alloy with niobium and molybdenum, chosen for very high strength at temperatures up to about 650 °C. We supply it as sheet, plate, coil, pipe & tube, fittings, flanges, fasteners, with EN 10204 3.1 certificates, from Mumbai to India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- UNS N07718
- W.Nr 2.4668
- ρ 8.19 g/cm³
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Inconel 718 Products
Inconel 718 Names, Designations & Composition
Inconel 718 is one alloy sold under several names. Its UNS number is N07718, the European material number is W.Nr 2.4668 and the EN name is NiCr19NbMo. The chart on the right shows the specified range of each main alloying element; the balance is the base metal.
Ranges from the product standard; minor elements and impurity limits are in the composition table below.
Inconel 718 Specifications by Product — Which Standard Applies?
The material standard changes with the product form. This is the table buyers ask for most.
| Product | Material standard | Dimensions |
|---|---|---|
| Inconel 718 sheet | ASTM B670 · AMS 5596 | ASTM A480 / B906 |
| Inconel 718 plate | ASTM B670 · AMS 5596 | ASTM A480 / B906 / A20 |
| Inconel 718 coil | ASTM B670 | ASTM A480 |
| Inconel 718 pipe & tube | a specification not yet established | ASME B36.19 / B36.10 |
| Inconel 718 fittings | a specification not yet established · a specification not yet established | ASME B16.9 · B16.11 |
| Inconel 718 flanges | project / purchase specification dependent | ASME B16.5 · B16.47 |
| Inconel 718 fasteners | ASTM A1014 (UNS N07718) where specified for applicable bolts and studs — product-type scope pending current standard text; for other types, material may be supplied to ASTM B637 bar where applicable, subject to the purchase specification or project drawing | ASME B18.2.1 · B18.2.2 |
Inconel 718 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 Mechanical Properties
| Specification | Product form | Condition | Requirement values |
|---|---|---|---|
| ASTM B637 (B637-26) | rod, bar, forgings, forging stock | as specified (e.g. solution treated and precipitation hardened) | As specified |
| ASTM B670 (B670-25) | plate, sheet, strip | annealed (per current scope) | As specified |
| ASTM A1014/A1014M (A1014/A1014M-26) | bolting (product types pending) | as specified | 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 per 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. Confirm against the edition on your purchase order.
Inconel 718 Corrosion Resistance — What Each Element Does
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.
Inconel 718 vs 625, 600 and 825
| Grade | PREN (approx.) | Pick it for |
|---|---|---|
| Inconel 600 | — | High-temperature oxidation, caustic and nuclear service |
| Inconel 718 | — | Very high strength at temperatures up to about 650 °C |
| Inconel 825 | ≈ 31 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| Inconel 625 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
Welding Inconel 718
| Matching filler | ERNiFeCr-2 (AWS A5.14) |
|---|---|
| Also used | Post-weld solution treatment and ageing restore strength |
Inconel 718 for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiTechnical documentation
A Kanak Steel technical data sheet for this product is being prepared. It is released as a PDF only after the current standard text, each value and its evidence, and a named technical reviewer have been confirmed — so no draft or placeholder sheet is offered for download.
Need technical data now? Send your enquiry with the standard and edition you are ordering to.
| Document | Inconel 718 — Master grade technical data sheet |
|---|---|
| Document ID | KS-TDS-N07718-M |
| Grade | Inconel 718 |
| UNS | N07718 |
| Product form | All product forms (master) |
| Standard | ASTM B637 (current edition B637-26) ASTM B670 (current edition B670-25) ASTM A1014 (current edition A1014/A1014M-26) By product form — bar and forgings, flat-rolled, bolting |
| Status | Under technical review for TDS |
- Technical Data Sheet — Under technical review
Inconel 718 — questions buyers ask
What is Inconel 718?
Inconel 718 is a age-hardenable nickel–chromium alloy with niobium and molybdenum. It is chosen for very high strength at temperatures up to about 650 °C.
Which standards cover Inconel 718 products?
Sheet: ASTM B670 · AMS 5596; Plate: ASTM B670 · AMS 5596; Coil: ASTM B670; Pipe & Tube: a specification not yet established; Fittings: a specification not yet established · a specification not yet established; Flanges: project / purchase specification dependent; Fasteners: ASTM A1014 (UNS N07718) where specified for applicable bolts and studs — product-type scope pending current standard text; for other types, material may be supplied to ASTM B637 bar where applicable, subject to the purchase specification or project drawing. Always name the standard and edition on your order.
What is the UNS number of Inconel 718?
UNS N07718, with the European material number W.Nr 2.4668.
What is the density of Inconel 718?
8.19 g/cm³ — use it to calculate weights: plate kg = L(m) × W(m) × t(mm) × 8.19.
Inconel 718 or Inconel 825?
Inconel 718 suits very high strength at temperatures up to about 650 °C; Inconel 825 is the step up for sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026