When sourcing high-performance high-temperature alloys for aerospace, power generation, oil and gas, or high-temperature industrial components, Inconel 718 round bar is one of the most popular material forms due to its strength, corrosion resistance, and machinability. Inconel 718 (UNS N07718) is a nickel-chromium-niobium alloy that performs exceptionally well even in the most demanding environments.
What Is Inconel 718 Round Bar?
An Inconel 718 round bar is a solid cylindrical rod of nickel-based superalloy used as feedstock for machining shafts, fasteners, turbine parts, flanges, and critical components. Bars can be supplied in various surface finishes (hot-rolled, cold drawn, peeled, bright ground) and to multiple standards including ASTM B637, AMS 5662, and AMS 5663.
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Inconel 718 Round Bar Chemical Composition (Typical Range, wt%)
| Element | Typical Range (%) |
|---|---|
| Nickel (Ni) | ~50–55 |
| Chromium (Cr) | 17–21 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75–5.50 |
| Molybdenum (Mo) | 2.8–3.3 |
| Titanium (Ti) | 0.65–1.15 |
| Aluminum (Al) | 0.20–0.80 |
| Carbon (C) | ≤0.08 |
| Others | Mn, Si, Cu trace levels |
Inconel 718 Round Bar Mechanical Property
| Condition | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|---|
| Solution-annealed (soft) | ~1100–1400 MPa | ~480–690 MPa | 20–35% | ~18–28 HRC |
| Aged/Hardened | ~1200–1950 MPa | ~760–1550 MPa | 10–20% | ~35–44 HRC |
Inconel 718 Round Bar Price Range (2025)
| Supplier / Region | Price (USD/kg) |
|---|---|
| Inconel 718 Round Bar | ~$12 – $30 |
| Inconel 718 ss flat bar | ~$35 – $55 |
| Inconel 718 ss square bar | ~$45 – $70 |
| Inconel 718 hexagonal bar | ~$50 – $85 |
| Inconel 718 steel threaded rod | ~$65 – $115 |
Hot Rolling vs. Cold Drawing: Cold-drawn or bright-finished round bars are typically more expensive due to tighter tolerances and better surface finish.
Heat Treatment Condition: Age-hardened (precipitation-hardened) bars are more expensive but offer higher strength and better creep resistance.
Certification and Testing: Materials conforming to aerospace or customer specifications (e.g., AMS 5662, AMS 5663, EN10204 3.1/3.2) are more expensive because traceability documentation is required.
GNEE is a reliable supplier of Inconel 718 round bars, offering UNS N07718 / W.Nr. 2.4668 round bars with diameters typically ranging from Ø6 mm to Ø450 mm, available in solution-treated or solution-treated and aged conditions.
All Inconel 718 round bars are manufactured according to ASTM B637, AMS 5662 / AMS 5663 standards and come with EN 10204 3.1 certificates.
GNEE offers various product forms, such as hot-rolled bars, forged bars, peeled bars, polished bars, and cut-to-length bars, to meet different processing and performance requirements.
For transportation and packaging, the round bars are protected with anti-rust oil, plastic wrapping, and packaged in seaworthy wooden crates or steel strapping.
FAQ
Q: What sizes of Inconel 718 round bars are available?
A: Typical diameter ranges from approximately 6 mm to 300 mm, with lengths up to approximately 6 meters, depending on the supplier's manufacturing capabilities.
Q: Why are Inconel 718 round bars expensive?
A: The high cost is due to the expensive alloying elements (nickel, niobium) and the typically stringent certification/testing requirements.
Q: What certifications should I request?
A: Common certifications include ASTM B637, AMS 5662/5663, and EN 10204 3.1/3.2 for quality assurance.
Q: Can Inconel 718 round bars be machined?
A: Yes, but machining is difficult due to work hardening; appropriate tools and techniques are crucial.
Q: Which industries use Inconel 718 round bars?
A: Aerospace components, gas turbines, power generation, chemical processing, nuclear reactors, and oil and gas components.
