INCONEL® 718
High-Temp Weldable INCONEL 718 Bar Nickel Alloy
INCONEL 718 round bar is in stock in the “Solution and Precipitation Heat-Treated” Condition, and ready to ship from Leading Edge Metals & Alloys. We currently offer 3–6 inch diameter bar produced to AMS 5663, with material also covered under ASTM B637 / ASME SB-637 specifications, suitable for demanding high-temperature and high-stress environments where strength, corrosion resistance, and long-term stability are critical.
This superalloy is a precipitation-hardenable nickel-chromium alloy known for its exceptional mechanical strength up to approximately 1300°F (704°C) and excellent resistance to oxidation, corrosion, fatigue, and creep. Compared to many other nickel-based superalloys, INCONEL 718 offers good weldability and fabrication characteristics, making it a preferred choice for complex, safety-critical components.
Its combination of strength, corrosion resistance, and fabricability makes it a go-to alloy for both OEM production and replacement parts. Widely used across industries that demand reliable performance under extreme conditions, Inconel 718 is commonly used in applications including Aerospace (turbine discs, engine components, and structural fasteners), Defense (missile hardware and propulsion system components), Chemical Processing (high-temperature reactor components, pressure vessels, and fittings), and Energy (downhole tools, valves and mandrels, high-pressure, and high-temperature service components.)
What you need to know about buying INCONEL 718 Bar
- When sourcing INCONEL 718 bar, availability, documentation, and material integrity matter. We offer:
- 3–6 inch round bar in stock in the Solution and Precipitation Heat Treated Condition
- Ready-to-ship inventory
- Clear specification alignment (ASM 5663 and ASTM B637)
- Any special tolerance specifications for the OD or Cut to Lengths
- Any special surface condition specifications
- Responsive support from a team experienced in exotic and refractory metals
- If you need additional sizes, cut-to-length options, or downstream machining support, we’ll collaborate with you to assess feasibility and timelines. INCONEL 718 is machinable but not forgiving. Buyers should expect:
- Higher cutting forces than carbon or stainless steels
- Tool wear if machining parameters are not optimized
- Benefits from rigid setups and controlled feed rates
- The upside: once machined and heat-treated correctly, parts deliver exceptional in-service reliability, which is why the alloy remains so widely specified despite its machining challenges.
Product Selection and Purchasing Options
Beyond Inconel, Leading Edge offers a wide range of products in multiple shapes and sizes, even in small quantities. Many are available for immediate shipment from our warehouse. If we don’t have the specialty material you need, there’s a good chance we can find it. With our flexible purchasing options, you can ensure materials are available when they’re needed. Purchasing options include blanket orders, just-in-time delivery, and consignment materials.
Industry Standards and Requirements
Industries constantly evolve, driven by a growing demand for scientific and technological advancement. Successful experimentation must ensure material integrity, safety, performance, and compliance with strict environmental and operational regulations.
These standards typically focus on aspects like purity, quality, and durability to guarantee that refractory metals meet the demanding conditions of high-stakes research applications. Because they serve multiple industries and extreme environments, this list includes more than average standards and requirements.
Standards and Requirements:
- ASTM International (American Society of Mechanical Engineers): Standards for materials used in energy applications.
- SAE Aerospace Material Specifications (AMS, formerly known as the Society of Automotive Engineers or SAE)
- ASME BPVC (Boiler and Pressure Vessel Code): Guidelines for materials used in pressure vessels and reactors.
- Department of Defense (DoD) Military Standards or Military Specifications (MIL) on the Defense Logistics Agency (DLA) ASSIST Database
We adhere to quality compliance certification standards and statutory regulations that pertain to our exotic materials, processes, custom machining services, traceability, and other aspects of our in-house expertise. Our materials specialists provide expert counsel on metal selection and inspection to ensure you receive materials that meet or exceed your expectations.
Leading Edge Metals & Alloys Certifications include:
- ISO9001:2015 and AS9100D Registered
- ITAR Registered
- NIST SP 800-171 and CMMC Compliant
Our deep understanding of this industry stems from our extensive experience, skilled metallurgy professionals, and a history of successful partnerships with leading national research labs.
FAQs About INCONEL
INCONEL® 718 ( UNS N07718) is used instead of conventional steels or stainless alloys when applications require exceptional strength, fatigue resistance, and corrosion resistance at elevated temperatures. It maintains mechanical integrity under extreme heat, pressure, and cyclic loading where conventional metals lose strength or fail.
INCONEL® 718 offers high tensile and yield strength, excellent creep and fatigue resistance, and strong oxidation and corrosion resistance. Its precipitation-hardened structure allows it to perform reliably across a wide temperature range, including cryogenic conditions up to approximately 1,300°F (704°C).
INCONEL® 718 is widely used in aerospace and defense components, gas turbines, rocket engines, nuclear and energy systems, chemical processing equipment, and high-pressure fasteners. Its strength and stability make it ideal for rotating, load-bearing, and safety-critical parts.
Leading Edge Metals & Alloys supplies INCONEL® 718 in bar, rod, plate, sheet, and forgings, as well as cut-to-size blanks and machined components. Materials can be provided in raw, semi-finished, or near-net configurations based on customer requirements.
INCONEL® 718 is notoriously difficult to machine due to its high strength, work-hardening tendency, and low thermal conductivity. Successful machining requires rigid setups, appropriate tooling, controlled cutting parameters, and allowance for cleanup stock. Heat treatment condition should be considered early, as it significantly impacts machinability.
Customers should specify product form, AMS or ASTM specification, heat-treat condition, dimensions, tolerances, inspection requirements, and intended service environment. Providing this information upfront allows LEMA to align material condition, processing, and documentation with application needs.
INCONEL 718 is most commonly supplied to AMS 5662, AMS 5663, and AMS 5664, depending on product form and heat treatment. ASTM standards may also apply for certain industrial applications. The correct specification depends on industry, application, and inspection requirements.
INCONEL 718 is typically supplied in the solution-annealed and precipitation-hardened condition. This condition provides a balance of machinability, strength, and fatigue resistance. Alternate conditions may be specified depending on fabrication sequence and final performance requirements.
Yes. INCONEL 718 can be welded using appropriate procedures and filler materials. Welding parameters, joint design, and post-weld heat treatment considerations are critical to maintaining mechanical properties and corrosion resistance.
INCONEL 718 can be welded to stainless or carbon steel in certain applications, but metallurgical compatibility, thermal expansion mismatch, and service conditions must be evaluated carefully. These joints are typically reviewed on a case-by-case basis.
INCONEL 718 does not rust like carbon steel and offers excellent resistance to oxidation and corrosion. Performance depends on the service environment, but the alloy is well-suited for high-temperature, high-pressure, and corrosive conditions.
INCONEL® 718 is typically chosen for higher strength and fatigue resistance, while INCONEL® 625 emphasizes corrosion resistance and fabricability. The optimal choice depends on mechanical loading, temperature, and environmental exposure.
Yes. LEMA supplies machined INCONEL 718 components, near-net shapes, and first-stage parts. This includes support for prototypes, low-volume programs, and production requirements with flexible sourcing and fulfillment.
Customers should share operating temperature, mechanical loads, fatigue exposure, corrosive environment, fabrication sequence, and compliance requirements. These inputs help determine the correct specification, condition, and processing approach.
