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Inconel 718 Sheets & Plates Supplier in Mumbai, India – ASTM B670 N07718
Nicorex Alloys is a supplier and stockist of Inconel 718 sheets and plates conforming to ASTM B670 / ASME SB-670 based in Mumbai, India. Alloy 718 (UNS N07718, Werkstoff 2.4668) is a nickel-chromium-iron-niobium-molybdenum material and a precipitation-hardenable superalloy in the Inconel flat-product range.
Its strengthening comes from γ″ (Ni₃Nb) and γ′ (Ni₃ (Al, Ti)) phase precipitation during ageing. The γ″ phase precipitates slowly, giving Nickel Alloy 718 a critical fabrication advantage: sheets and plates can be welded without spontaneous hardening in the HAZ. The alloy delivers exceptional strength from cryogenic (–253°C / –423°F) to 704°C (1300°F) for long-term service. AMS 5596 covers solution-annealed sheet/plate; AMS 5597 covers the precipitation-hardened condition.
Sheet thicknesses range from 0.5-4.76 mm and plate from 4.76-100 mm, with standard widths of 1000–2000 mm and lengths of 2000–6000 mm. These Inconel sheets and plates are supplied as hot rolled plate, cold rolled sheet, strip, coil, and foil to suit both fabrication and high-performance end use. They are used in oil and gas production, aerospace parts, nuclear power plants, and power plants, where strength and resistance to corrosion play an important role. Nicorex Alloys, an ISO 9001 / ISO 14001 certified importer and trading company providing Inconel sheets and plates with EN 10204/3.1B MTC, PMI, and full traceability, supporting customers’ requirements for reliable Inconel sheet and plate products.
Inconel 718 Sheets & Plates Specifications
The table below shows the specifications of Inconel 718 sheets, including thickness and finish and its available forms.
| Standard | ASTM B670 / ASME SB-670 |
|---|---|
| AMS | 5596 (Solution Annealed) / 5597 (Precipitation Hardened) |
| Sheet Thickness | 0.5-4.76 mm |
| Plate Thickness | 4.76-100 mm |
| Width | 1000–2000 mm |
| Length | 2000–6000 mm |
| Forms | HR Plate, CR Sheet, Strip, Coil, Shim, Foil |
| Condition | Solution Annealed / Precipitation Hardened |
Chemical Composition of Inconel 718 Sheets & Plates
The performance of Inconel 718 is derived from its complex chemical composition. Below is the chemical composition as per ASTM B670 for UNS N07718.
| Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Niobium + Tantalum (Nb+Ta) | Molybdenum (Mo) | Titanium (Ti) | Aluminium (Al) | Carbon (C) | Cobalt (Co) | Copper (Cu) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulphur (S) | Boron (B) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WT% | 50.0 – 55.0 | 17.0 – 21.0 | Balance | 4.75 – 5.50 | 2.80 – 3.30 | 0.65 – 1.15 | 0.20 – 0.80 | 0.08 max | 1.0 max | 0.30 max | 0.35 max | 0.35 max | 0.015 max | 0.015 max | 0.006 max |
Nb at 4.75–5.50% is the primary strengthening element; it forms the γ″ (Ni₃Nb) precipitate that delivers the alloy’s high yield strength after ageing. Ti and Al contribute γ′ (Ni₃ (Al, Ti)) as a secondary hardener. Cr at 17–21% provides oxidation and corrosion resistance, while Mo adds pitting resistance in chloride media.
Mechanical Properties of Inconel 718 Sheet & Plate
Mechanical properties of Inconel 718 sheet and plate in the precipitation-hardened condition per ASTM B670 are listed below.
| Nominal Thickness, in. (mm) | Tensile Strength min, ksi (MPa) | Yield Strength (0.2% offset), min, ksi (MPa) | Elongation in 2 in. or 50 mm (4D), min, % |
|---|---|---|---|
| Up to 1.0 (25.4), incl | 180 (1241) | 150 (1034) | 12 |
| Over 1.0 to 2.25 (25.4 to 57.2), incl | 180 (1241) | 150 (1034) | 10 |
Inconel 718 Equivalent Designations & International Standards
Inconel 718 is internationally recognised under multiple equivalent designations and standards, including ASTM/ASME B670.
| Standard | UNS | Werkstoff | JIS | EN |
|---|---|---|---|---|
| Designation | N07718 | 2.4668 | NCF 718 | NiCrFe19NbMo |
Get Inconel 718 Sheets & Plates at Competitive Prices
Available Forms of Inconel 718 Sheets & Plates
UNS N07718 flat products are stocked in these forms to suit different fabrication and application requirements:
Inconel 718 Hot Rolled Plate
Inconel 718 Cold Rolled Sheet
Inconel 718 Strip
Inconel 718 Shim Sheet
Inconel 718 Perforated Sheet
Alloy 718 Foil
Nickel Alloy 718 Coil
Inconel 718 Clad Plate
Corrosion & Environmental Performance of Inconel 718 Flat Products
Chromium (17–21%) forms a protective oxide film that resists oxidation up to about 982°C (1800°F) for short periods. Molybdenum (2.8–3.3%) improves resistance to pitting corrosion in chloride-containing environments. In sour gas (H₂S + CO₂ + Cl⁻).
Inconel 718 plate in the aged condition meets NACE MR0175 requirements. Cryogenic toughness holds at –253°C, making this alloy viable from liquid hydrogen temperatures to red-hot turbine exhaust.
Compared to 316L, Alloy 718 offers higher chloride SCC resistance (50–55% Ni vs 10–14%) and far greater strength. Compared to Hastelloy C-276, Inconel 718 provides precipitation-hardened strength that C-276 (solid-solution only) cannot match, though C-276 is superior in severe reducing acid service.
Welding & Fabrication Guidelines for Inconel 718 Sheet & Plate
Weld in the solution-annealed condition using GTAW (preferred for sheet gauge), GMAW, or SMAW. Filler: ERNiFeCr-2 (FM 718) for GTAW/GMAW; ENiCrFe-2 for SMAW. No preheat required for SA material. The slow γ″ ageing response prevents spontaneous HAZ cracking during welding.
PWHT is required for full strength recovery: solution anneal at 954–982°C followed by the standard two-step ageing cycle (718°C/8 hr → 621°C/18 hr total). An alternative (1066°C solution + 760°C/10 hr → 649°C/20 hr) improves stress-rupture life. Clean all joint surfaces to remove sulphur and phosphorus contamination.
Industries Using Inconel 718 Sheets & Plates
Precipitation-hardened strength and cryogenic-to-704°C service capability make Inconel 718 sheet and plate a perfect choice across these industries:
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Aerospace & Defence: Engine casings, exhaust components, and structural airframe panels use Inconel 718 sheet for its 1241 MPa tensile strength in the aged condition. The slow ageing response allows complex forming before final PWHT.
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Oil & Gas (NACE Sour Service): Wellhead components, subsea valve bodies, and downhole tool housings. UNS N07718 in the aged condition is listed under NACE MR0175 / ISO 15156 for H₂S-bearing environments.
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Cryogenic & LNG: Nickel Alloy 718 retains toughness at –253°C (–423°F). Plates are used for LNG tank internals, cryogenic valve bodies, and liquid hydrogen/oxygen systems in launch vehicles.
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Nuclear Energy: Fuel assembly hardware, reactor internals, and control rod mechanisms. Radiation resistance and high-temperature strength sustain performance over multi-decade lifetimes.
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Power Generation: Land-based gas turbine combustion liners, transition pieces, and exhaust ducting. Alloy 718 plate replaces cobalt-base alloys in cost-sensitive applications.
How to Order Inconel 718 Sheet & Plate from Nicorex Alloys
Provide the following requirement details:
- Product Form – Sheet, Plate, Strip, Coil, or Foil
- Thickness –Specify in mm or gauge number
- Width × Length – Standard size or custom cut
- Quantity- (in kg, MT, or number of sheets)
- Condition - (Solution Annealed / Aged / As-Rolled, as applicable)
- Edge Type – Mill, Slit, Sheared, or Rolled
- Standard | ASTM B670 / ASME SB-670 | AMS 5596
- Additional Testing (TPI, PMI, UT, Mechanical testing – if required)
- Packaging – Standard, export-grade, wooden case
- Delivery Destination – Domestic or export
Frequently Asked Questions
What is the difference between SA and PH Inconel 718 Sheet?
Solution annealed (AMS 5596): 862 MPa (125 ksi) min tensile, soft and formable for fabrication before ageing. Precipitation hardened (AMS 5597): 1241 MPa (180 ksi) min tensile, supplied in the final hardened condition for direct structural use.
What Heat Treatment is used for Alloy 718 Plates?
Standard: solution anneal 954–982°C (1750–1800°F) for 1 hr/in, air cool. Age at 718°C (1325°F) for 8 hr, furnace cool to 621°C (1150°F), hold 18 hr total, air cool. Alternative: 1066°C solution + 760°C/10 hr then 649°C/20 hr for improved stress-rupture life.
Can Nickel Alloy 718 Sheet be Welded?
Yes. The slow γ″ (Ni₃Nb) ageing response allows welding without spontaneous HAZ hardening. Use FM 718 (ERNiFeCr-2) filler, then apply full ageing PWHT to recover strength.
Is UNS N07718 suitable for Cryogenic Service?
Yes. Maintains toughness at –253°C (–423°F) for LNG tanks, cryogenic valves, and liquid hydrogen/oxygen systems.
What ASTM Standard Covers Inconel 718 Sheet and Plate
ASTM B670 / ASME SB-670. AMS 5596 (SA) and AMS 5597 (PH) are the aerospace specifications.
What is the Maximum Service Temperature?
704°C (1300°F) for long-term service with full precipitation-hardened strength. Short-term oxidation resistance extends to 982°C. Above 704°C, γ″ overages and strength decrease.