Inconel 718 Plate & Sheet | Custom Size Available

When fabricating aircraft engine nacelles, combustion chamber liners, or high-temperature exhaust systems, flat-rolled Inconel 718 (UNS N07718 / W.Nr. 2.4668 / GH4169)​ must deliver not only certified chemistry but also tight thickness tolerance, minimal residual stress, and a surface free of laps or seams. Shanghai COCESS Special Alloys Co., Ltd​ supplies Inconel 718 plate, sheet, and strip in the solution-annealed condition, produced to ASTM B670, AMS 5596, and AMS 5597 specifications. We maintain stock across popular gauges and offer CNC plasma or water-jet profiling to reduce scrap and set-up time in your shop.

Metallurgical Background & Chemical Composition

Inconel 718 is a precipitation-hardenable Ni-Cr-Fe alloy whose strength derives from coherent γ" (Ni₃Nb) precipitates that form during a two-step aging cycle (typically 720°C × 8h + furnace cool to 620°C × 8h). Plates and sheets are supplied in the solution-annealed (soft) condition​ to permit forming and punching before final aging.

Typical Chemistry (wt%, per AMS 5596 / ASTM B670):

• Nickel (Ni):​ 50.00 – 55.00 % (Balance)

• Chromium (Cr):​ 17.00 – 21.00 % (Oxidation resistance)

• Iron (Fe):​ 16.00 – 20.00 % (Austenite stabilizer)

• Niobium + Tantalum (Nb+Ta):​ 4.75 – 5.50 % (Primary γ" (Ni₃Nb) strengthener)

• Molybdenum (Mo):​ 2.80 – 3.30 % (Solid-solution strengthening, pitting resistance)

• Titanium (Ti):​ 0.65 – 1.15 %

• Aluminum (Al):​ 0.20 – 0.80 %

• Carbon (C):​ ≤ 0.08 %

• Sulfur (S):​ ≤ 0.015 % (Strictly controlled for surface quality & hot workability)

• Cobalt (Co):​ ≤ 1.00 %

• Boron (B):​ ≤ 0.006 %

Mechanical Properties (Solution Treated + Aged per AMS 5663)

Plates and sheets are typically sold in the solution-treated condition and aged by the end-user after forming/welding.

• Tensile Strength (Rm):​ ≥ 1275 MPa (185 ksi); typical 1300–1380 MPa

• Yield Strength (Rp0.2):​ ≥ 1035 MPa (150 ksi); typical 1100–1170 MPa

• Elongation (A5):​ ≥ 12–15 % (higher in thin gauge sheet)

• Hardness:​ 331–401 HB (34–44 HRC) in fully aged condition

• Density:​ 8.24 g/cm³

• Service Temperature:​ –253 °C to 650 °C continuous; short excursions to 700 °C depending on stress.

Available Plate & Sheet Forms — Custom Sizes & Cutting

We stock and process Inconel 718 flat products in the following ranges. Non-standard widths/lengths and custom profiling are available upon request.

Common Supply Condition:​ Solution annealed, rapid quenched, descaled (pickled) or bright annealed for sheet. Aged condition available by prior arrangement.

Custom Processing Services

To shorten your lead time and minimize material waste, Shanghai COCESS Special Alloys Co., Ltd​ offers:

• CAD-Based Profiling:​ CNC plasma or water-jet cutting to your DXF/DWG file — any contour, bolt-hole pattern, or developed shape for combustor liners, flanges, or shrouds.

• Shearing & Slitting:​ For sheet gauges up to 6 mm, precision shear to size or coil slitting.

• Heat Treatment:​ In-house solution anneal and double-step aging with recorded thermal cycles; stress-relief options for formed parts.

• Surface Finishing:​ Pickling, passivation, or glass-bead blasting on request.

• Non-Destructive Testing (Optional):​ Dye penetrant inspection (PT per ASTM E1417) and ultrasonic thickness verification for critical aerospace or nuclear applications.

Typical Applications for Inconel 718 Plate & Sheet

• Aerospace & Defense:​ Engine nacelle structures, thrust reverser components, combustor liners, afterburner flaps, case stiffeners, and cryogenic (LOX/LH₂) tank bulkheads.

• Gas Turbines & Power Gen:​ Transition pieces, outer casings, seal segments, and heat shields.

• Oil & Gas / Marine:​ High-strength sour-service panels, flame-arrestor plates, and pressure boundary reinforcements in aggressive environments (NACE MR0175 compliant).

• High-Perf. Racing & Auto:​ Exhaust heat shields, turbo manifold heat blankets backing plates, and header enclosures.

Every shipment includes an EN 10204 3.1 Mill Test Report​ (heat analysis, mechanical test results, heat treat record). EN 10204 3.2 and third-party inspection (SGS, TÜV, DNV, etc.) can be arranged. Material is packaged in seaworthy wooden crates with interleaving to protect mill finishes during transit.

For Inconel 718 plate, sheet, or cut-to-shape blanks—including current stock thicknesses, a sample MTR, or a project quotation—contact Shanghai COCESS Special Alloys Co., Ltd. Our technical staff can advise on minimum bend radius, forming temperatures, and post-form aging to help you get the best result from your fabricated assemblies.

Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com