High-Strength Inconel 718 Nickel Alloy Plate Aerospace & Industrial Grade

High-Strength Inconel 718 Nickel Alloy Plate Aerospace & Industrial Grade

Products Specification

High-Strength Inconel 718 Nickel Alloy Plate – Aerospace & Industrial Grade

Inconel 718 is a precipitation-hardenable nickel-chromium superalloy renowned for its exceptional mechanical strength, corrosion resistance, and performance across extreme temperature ranges—from cryogenic conditions (-253°C / -423°F) up to 704°C (1300°F). Engineered for the most demanding applications in aerospace, oil & gas, nuclear energy, and chemical processing industries, Inconel 718 nickel alloy plate offers an unmatched combination of fabricability, weldability, and structural integrity under stress.

This product information page provides comprehensive technical specifications, material standards, physical and mechanical properties, common applications, and processing guidelines for aerospace- and industrial-grade Inconel 718 plate, ensuring engineers, procurement specialists, and manufacturers can confidently select this high-performance material for critical components.

Why Choose Inconel 718 Plate?

Inconel 718 stands out among nickel-based superalloys due to its unique composition—primarily nickel (50–55%), chromium (17–21%), iron (balance), with strategic additions of niobium (4.75–5.5%) and molybdenum (2.8–3.3%) that enable gamma-double-prime (γ″) and gamma-prime (γ′) precipitation hardening. This microstructure delivers:

• Outstanding tensile, fatigue, creep, and rupture strength at elevated temperatures
• Excellent resistance to oxidation, carburization, and sulfidation up to 1000°C
• Superior corrosion resistance in acidic, alkaline, seawater, and chloride-rich environments
• Good weldability with minimal risk of post-weld cracking
• Stable mechanical properties from cryogenic to high-temperature service

These attributes make Inconel 718 plate the material of choice for jet engines, rocket motors, pressure vessels, downhole tools, and high-stress structural components where failure is not an option.

Material Standards & Designations

Inconel 718 plate is manufactured to stringent international specifications to ensure consistency and reliability. Common standards include:

All plates are typically supplied in solution-annealed and aged (precipitation-hardened) condition unless otherwise specified, ensuring optimal mechanical performance.

Chemical Composition (Weight %)

The precise chemistry of Inconel 718 is tightly controlled to achieve its superior properties:

Note: Nb is the key strengthening element, forming stable γ″ (Ni₃Nb) precipitates during aging.

Physical Properties

These properties support dimensional stability during thermal cycling—critical in turbine and combustion chamber applications.

Mechanical Properties (Room Temperature, Aged Condition)

Typical minimum values per ASTM B670 and AMS 5596:

At 650°C (1200°F), tensile strength remains above 1035 MPa (150 ksi), demonstrating exceptional high-temperature retention.

Available Plate Dimensions & Tolerances

Inconel 718 plate is available in a wide range of thicknesses, widths, and lengths to meet diverse engineering needs:

• Widths: 600 mm to 2000 mm
• Lengths: 1000 mm to 6000 mm (custom cut-to-size options available)
• Surface Finish: Hot-rolled, cold-rolled, pickled, or polished (as per application requirements)
• Certification: Mill Test Reports (MTRs) with full traceability (heat number, chemical analysis, mechanical test data)

Key Applications

Aerospace Industry

• Jet engine compressor discs, blades, and casings
• Turbine rotors and afterburner components
• Rocket thrust chambers and fuel system parts
• Landing gear and high-speed airframe structures

Oil & Gas / Energy

• Downhole wellhead components
• Subsea manifolds and Christmas trees
• High-pressure valves and fasteners in sour (H₂S) environments
• Nuclear reactor core internals

Industrial & Chemical Processing

• Cryogenic storage tanks (LNG, liquid oxygen)
• Heat exchangers in corrosive media
• Pollution control systems (e.g., flue gas desulfurization)
• High-temperature furnace fixtures

Fabrication & Welding Guidelines

Inconel 718 plate is highly fabricable using standard shop practices:

• Machining: Use rigid setups, low cutting speeds, and high feed rates. Carbide tools recommended.
• Forming: Can be cold-formed in annealed condition; hot forming may be required for severe bends.
• Welding: Excellent weldability via GTAW (TIG), GMAW (MIG), EB, and resistance welding.
  • Filler Metal: ERNiFeCr-2 (AWS A5.14) or AMS 5832
  • Preheat: Not required (room temperature acceptable)
  • Interpass Temp: Keep below 93°C (200°F)
  • Post-Weld Heat Treatment (PWHT): Full solution anneal (954–982°C) followed by aging (718°C for 8 hrs, furnace cool to 621°C, hold 8 hrs, then air cool) for maximum strength

Avoid oxy-acetylene and submerged arc welding (SAW) due to excessive heat input and cracking risk.

Quality Assurance & Traceability

Every batch of Inconel 718 plate undergoes rigorous quality control:

• Spectrometric chemical analysis
• Ultrasonic testing (UT) for internal defects (per AMS 2631 or customer request)
• Mechanical testing per lot
• Full documentation compliant with AS9100 (aerospace) and ISO 9001 standards

Lot traceability ensures compliance with FAA, EASA, API, and NORSOK requirements.

Conclusion: The Gold Standard in Superalloy Plates

For mission-critical applications demanding high strength, corrosion resistance, and thermal stability, Inconel 718 nickel alloy plate remains the industry benchmark. Its proven performance in the harshest environments—combined with global material standards, reliable supply chains, and advanced manufacturing capabilities—makes it indispensable across aerospace, defense, energy, and industrial sectors.

Whether you're designing a next-generation turbine blade or a deep-sea valve for offshore drilling, Inconel 718 plate delivers the confidence that your component will perform reliably under extreme stress, temperature, and corrosion.

Contact us today for custom dimensions, certifications, or technical support. We supply certified Inconel 718 plate in full compliance with AMS, ASTM, and NACE standards—ready for immediate shipment worldwide.

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