Inconel 718 Round Bar: Properties, Specifications and Industrial Buying Guide
Inconel 718 Round Bar Inconel 718 round bar is a high-strength, nickel-based superalloy used in demanding engineering applications that require excellent mechanical properties, corrosion resistance and performance at elevated temperatures. Also known as Alloy 718, it is identified by UNS N07718 and is widely used in aerospace, oil and gas, power generation and specialised industrial manufacturing.
Unlike conventional stainless steels and many other nickel alloys, Inconel 718 is strengthened through precipitation hardening. This gives it a combination of high tensile strength, good fatigue resistance and useful performance under demanding service conditions.
For engineers, manufacturers and procurement professionals, selecting the correct Inconel 718 round bar requires attention to its grade, dimensions, heat-treatment condition, applicable standards and material documentation.
This guide explains the important properties, specifications, applications and purchasing considerations associated with Inconel 718 round bars.
What Is Inconel 718?
Inconel 718 is a precipitation-hardenable nickel-chromium alloy containing iron, niobium, molybdenum and other alloying elements.
It is designed for applications where high mechanical strength and resistance to demanding operating environments are important.
Important material identifiers include:
- Material name: Inconel 718
- Common designation: Alloy 718
- UNS designation: N07718
- Material family: Nickel-based superalloy
- Werkstoff number: 2.4668
- Product form covered: Round bar
The alloy is particularly recognised for its ability to achieve high strength through controlled heat treatment.
Chemical Composition of Inconel 718
The chemical composition of Inconel 718 contributes to its strength, corrosion resistance and high-temperature characteristics.
The following table provides commonly specified composition limits for Alloy 718. The exact requirements should always be verified against the applicable material specification and material test certificate.
| Element | Typical specification range or limit |
|---|---|
| Nickel (Ni) | 50.0–55.0% |
| Chromium (Cr) | 17.0–21.0% |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb + Ta) | 4.75–5.50% |
| Molybdenum (Mo) | 2.80–3.30% |
| Titanium (Ti) | 0.65–1.15% |
| Aluminium (Al) | 0.20–0.80% |
| Cobalt (Co) | 1.0% maximum |
| Carbon (C) | 0.08% maximum |
| Manganese (Mn) | 0.35% maximum |
| Silicon (Si) | 0.35% maximum |
| Phosphorus (P) | 0.015% maximum |
| Sulphur (S) | 0.015% maximum |
These are general reference limits. The applicable product specification should be checked for the complete chemistry requirements and any additional restrictions.
Important Properties of Inconel 718 Round Bar
Inconel 718 is selected for applications requiring a combination of high strength, fatigue resistance and corrosion performance.
1. High Mechanical Strength
One of the most important characteristics of Inconel 718 is its high mechanical strength after suitable precipitation-hardening treatment.
Its strength makes it suitable for selected components exposed to significant mechanical loads.
2. Precipitation-Hardening Capability
Inconel 718 develops its high strength through a controlled heat-treatment process.
Niobium, titanium and aluminium contribute to the precipitation-strengthening mechanism. The final properties depend on the heat-treatment cycle and material condition.
3. Corrosion Resistance
The nickel and chromium content contributes to resistance against several corrosive environments.
The alloy is used in selected applications where corrosion resistance and mechanical strength are both important. However, its suitability must be checked against the actual chemical environment and operating conditions.
4. Fatigue Resistance
Inconel 718 is used in components exposed to repeated mechanical loading. Its fatigue performance depends on the material condition, component geometry, surface finish, manufacturing process and operating environment.
5. Elevated-Temperature Performance
Inconel 718 is used in selected elevated-temperature applications, particularly in aerospace and power-generation engineering.
Its allowable service temperature depends on the design, stress level, exposure duration and applicable engineering requirements.
Heat Treatment of Inconel 718
Heat treatment is an important part of achieving the required mechanical properties of Inconel 718.
The alloy is commonly supplied in a solution-treated condition before precipitation hardening, depending on the product specification and intended application.
Solution Treatment
Solution treatment is used to establish a suitable metallurgical condition before subsequent ageing.
Precipitation Hardening
Ageing treatments allow strengthening precipitates to form within the alloy’s microstructure.
The commonly used strengthening phases include gamma double-prime and gamma-prime.
Why Does Heat Treatment Matter?
The heat-treatment condition affects:
- Tensile strength
- Yield strength
- Hardness
- Ductility
- Fatigue performance
- Dimensional stability
Buyers should specify the required condition and mechanical-property limits rather than assuming that every Inconel 718 round bar has identical properties.
Heat treatment should follow the applicable material specification and qualified processing procedure.
Common Standards for Inconel 718
The applicable material standard depends on the product form and project requirements.
| Standard | Product form |
|---|---|
| ASTM B637 | Precipitation-hardening nickel alloy bars, forgings and related product forms covered by the specification |
| AMS 5662 | Nickel alloy bars, forgings and rings in a specified condition |
| AMS 5663 | Nickel alloy bars, forgings and rings in a precipitation-hardened condition |
These are commonly referenced specifications associated with Alloy 718. Confirm the current edition, exact product form, material condition and supplementary requirements before procurement.
Do not assume that every specification applies to every Inconel 718 product.
Industrial Applications of Inconel 718
Inconel 718 is used across industries where mechanical strength, fatigue resistance and performance under demanding operating conditions are important.
Aerospace Industry
Selected aerospace applications include:
- Engine components
- Turbine-related parts
- High-strength fasteners
- Rotating components
- Specialised structural components
Oil and Gas Industry
Potential applications include:
- Selected downhole equipment components
- High-strength fasteners
- Specialised valves and fittings
- Pressure-related equipment components
- Selected offshore engineering components
The suitability of the alloy for sour-service applications must be checked against the relevant standards and project requirements.
Power Generation
Inconel 718 is used in selected power-generation components where high mechanical strength and elevated-temperature performance are required.
Industrial Engineering
The alloy is also used in specialised machinery and equipment where conventional materials may not provide the required mechanical performance.
Inconel 718 Round Bar: What Should Buyers Check?
Before purchasing Inconel 718 round bars, procurement teams should verify the following:
- Grade: Confirm Inconel 718 / Alloy 718 / UNS N07718.
- Product form: Specify round bar or another required product form.
- Dimensions: Confirm diameter, length and dimensional tolerances.
- Applicable standard: Specify the required ASTM or AMS specification.
- Material condition: Confirm solution-treated or precipitation-hardened requirements.
- Chemical composition: Check the reported analysis against the governing specification.
- Mechanical properties: Verify tensile strength, yield strength, elongation and hardness requirements.
- Material test certificate: Request the required chemical and mechanical test results.
- Traceability: Confirm heat number and batch identification.
- Inspection: Specify additional testing or third-party inspection where required.
A clear purchase specification helps prevent material mismatches and supports reliable procurement.
Inconel 718 Supplier in India
Manan Steel & Metals deals in specialty metals and alloys for industrial and engineering requirements.
Buyers looking for Inconel 718 can share their required grade, dimensions, quantity, applicable specification and material condition.
Providing the technical details at the enquiry stage helps identify the correct material requirements.
Explore the Manan Steel & Metals website or submit your requirement through the Contact Us page.
You can also refer to the round bar product page for additional product information.
Frequently Asked Questions About Inconel 718 Round Bar
1. What is the UNS number of Inconel 718?
The UNS designation of Inconel 718 is N07718.
2. What is the Werkstoff number of Inconel 718?
The Werkstoff number commonly associated with Inconel 718 is 2.4668.
3. Is Inconel 718 a precipitation-hardening alloy?
Yes. Inconel 718 is a precipitation-hardenable nickel-based alloy. Controlled heat treatment develops its high mechanical strength.
4. What is the main difference between Inconel 718 and ordinary stainless steel?
Inconel 718 is a nickel-based precipitation-hardenable superalloy designed for demanding mechanical and temperature conditions. Stainless steel grades have different compositions, strengthening mechanisms and application limits.
5. Which industries use Inconel 718?
It is used in selected aerospace, oil and gas, power-generation and specialised industrial engineering applications.
6. What standard applies to Inconel 718 round bars?
ASTM B637 is a commonly referenced specification for precipitation-hardening nickel alloy bars and other covered product forms. Specific AMS specifications may also apply depending on the application and material condition.
Conclusion
Inconel 718 round bar is an important material for specialised engineering applications requiring high mechanical strength, fatigue resistance and dependable performance under demanding conditions.
Its precipitation-hardening capability distinguishes it from many conventional nickel alloys. However, selecting the correct product requires careful verification of grade, material condition, dimensions, applicable standards and material documentation.
For Inconel 718 and other specialty alloy requirements, contact Manan Steel & Metals with your technical specifications.
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