What AMS 5662 Inconel 718 round bar is used for - in one sentence: Inconel 718 (UNS N07718) is the precipitation-hardenable nickel-chromium alloy you choose when you need the highest strength available in a nickel superalloy - yield strength up to 1034 MPa (150 ksi) - combined with excellent corrosion resistance and outstanding weldability for aerospace and oil-gas applications. AMS 5662 is the solution-annealed condition, the softest and most machinable state, ready for you to age-harden to final properties after fabrication.
Inconel 718 (UNS N07718, W.Nr. 2.4668) is a precipitation-hardenable nickel-chromium-iron alloy containing approximately 50-55% nickel, 17-21% chromium, 4.75-5.5% niobium, and 2.8-3.3% molybdenum . The niobium and molybdenum additions provide the corrosion resistance, while aluminum and titanium enable the age-hardening response that delivers exceptional strength .
AMS 5662 defines the solution-annealed condition - the rawest and softest state of Inconel 718 . In this condition, the alloy is readily machinable and formable, and can be subsequently aged to achieve final mechanical properties. AMS 5662 bar can be heat treated into AMS 5663 (solution treated and aged) to achieve specific outcomes such as optimum impact properties or optimum tensile and creep-rupture properties .
That is why AMS 5662 Inconel 718 round bar is widely used for gas turbine components, downhole drilling tools, sub-surface safety valves, high-strength bolting, fasteners, and springs - anywhere the combination of ultra-high strength, corrosion resistance, and weldability is required .
Chemical Composition of UNS N07718 Inconel 718 Round Bar (wt%)
| Element | Content Range |
|---|---|
| Ni+Co | 50.0‑55.0 |
| Cr | 17.0‑21.0 |
| Fe | Balance (Remainder) |
| Nb+Ta | 4.75‑5.50 |
| Mo | 2.80‑3.30 |
| Ti | 0.65‑1.15 |
| Al | 0.20‑0.80 |
| C | ≤0.08 |
| Mn | ≤0.35 |
| Si | ≤0.35 |
| P | ≤0.015 |
| S | ≤0.015 |
| B | ≤0.006 |
Expert Note: Nb‑Ta, Ti and Al enable precipitation hardening after aging heat‑treatment; Cr delivers oxidation resistance; Mo provides solid‑solution strengthening. Actual values follow official mill test certificate.
Physical & Mechanical Properties (AMS 5662 Solution‑Annealed, Room‑Temperature)
Physical Properties
| Property | Typical Value | Remarks |
|---|---|---|
| Density | 8.24 g/cm³ | 20 ℃ |
| Melting Range | 1260‑1330 ℃ | ‑ |
| Elastic Modulus | 199 GPa | ‑ |
| Thermal Conductivity | 11.6 W/(m·K) | 20 ℃ |
| Thermal Expansion Coefficient | 13.0 ×10⁻⁶/K | 20‑100 ℃ |
| Operating Temperature | ‑253 ℃ ~704 ℃ | Long‑term service limit for creep performance |
| Magnetic Property | Non‑magnetic | Solution‑annealed state |
Mechanical Properties (AMS 5662 Solution‑Annealed Condition)
| Performance Index | Minimum Requirement | Typical Value | Test Condition |
|---|---|---|---|
| Tensile Strength | 1034 MPa (150 ksi) | 1138 MPa | Room temperature |
| Yield Strength (0.2% offset) | 517 MPa (75 ksi) | 621 MPa | Room temperature |
| Elongation | 30 % | 38 % | Room temperature |
| Hardness | ‑ | 230‑290 HB | Solution‑annealed |
Note: After subsequent age‑hardening heat‑treatment (AMS 5663 condition), tensile strength ≥1241 MPa, yield strength ≥1034 MPa can be achieved for final service parts.
Our supply highlights：Custom sizes service | Fast delivery | VIM+VAR remelting option | Complete EN10204‑3.1 MTR report | PMI positive material identification | Third‑party inspection available
Applicable Standards: AMS 5662, ASTM B637, UNS N07718, DIN W.Nr 2.4668
Industrial Pain Points Solved by AMS 5662 UNS N07718 Round Bar
Aerospace and oil‑gas material engineers often face these costly component‑failure challenges for high‑load high‑temperature hardware:
- Insufficient high‑temperature creep‑rupture strength: Ordinary stainless steel and many nickel alloys lose mechanical strength under elevated‑temperature continuous load, leading to deformation or fracture of rotating aerospace and downhole components.
- Machining difficulty for high‑strength superalloy: If supplied in fully aged hard condition, complex‑feature parts suffer rapid tool wear, poor dimensional control during CNC machining.
- Combined loading requirement: Components need both ultra‑high mechanical strength and moderate corrosion‑oxidation resistance under cryogenic up to 704 ℃ working environment.
- Welding risk for high‑strength superalloy: Some high‑strength superalloys crack easily during welding, cannot perform post‑weld aging for complex assemblies.
How AMS 5662 Inconel 718 solution‑annealed round bar addresses above pain‑points
- Precipitation‑hardenable ultra‑high‑strength potential: Solution‑annealed base material can obtain industry‑leading tensile & yield strength after standardized aging heat‑treatment, excellent creep‑rupture resistance up to 704 ℃ for rotating and high‑load parts.
- Optimized machinability for complex parts: AMS 5662 solution‑annealed status has lower hardness compared with aged AMS 5663; greatly reduces cutting‑tool consumption for intricate CNC‑machined aerospace and oil‑gas components, better dimensional stability before final aging heat‑treatment.
- Wide service‑temperature adaptability: Reliable performance from cryogenic‑253 ℃ up to 704 ℃, combines oxidation resistance and moderate sour‑gas corrosion resistance.
- Good fabricability & weldability in solution‑annealed state: Supports forming and welding. After welding, components can go through unified aging heat‑treatment to restore full mechanical properties.
Important Limitation: Inconel 718 provides lower general pitting & acid corrosion resistance compared with Inconel 625. For severe chloride‑rich sour‑gas or heavy chemical mixed‑acid environment, Inconel 625 shall be evaluated. Final aging heat‑treatment procedure must strictly follow AMS standard to achieve target mechanical performance.
Nickel Alloy Round‑Bar Material Comparison for Aerospace & Oil‑Gas Service
Help buyers make quick material‑selection decision
| Grade & Specification | Strengthening Mechanism | Key Advantage | Main Limitation | Best‑Fit Scenario |
|---|---|---|---|---|
| Inconel 718 AMS 5662 UNS N07718 | Precipitation‑hardenable (age‑treated after machining) | Obtain ultra‑high strength after aging; good machinability in solution‑annealed state; outstanding creep‑rupture up to 704℃ | Inferior acid/chloride pitting resistance vs Inconel 625; requires controlled aging heat‑treatment | Aerospace turbine parts, high‑strength fasteners, oil‑gas high‑load downhole tools, complex CNC‑machined components |
| Inconel 718 AMS 5663 UNS N07718 | Precipitation‑hardened (delivered aged) | Final service hardness as‑supplied, no further heat‑treatment needed | Poor machinability, heavy tool wear for complex parts | Simple‑geometry finished parts with no post‑machining heat‑treatment |
| Inconel 625 ASTM B446 UNS N06625 | Solid‑solution strengthening, no aging needed | Superior chloride & sour‑gas corrosion resistance, good weldability without heat‑treatment | Lower yield / tensile strength, cannot reach 718 strength level | Off‑shore sour‑gas hardware, corrosion‑dominated components without high‑creep requirement |
| Incoloy 825 ASTM B425 UNS N08825 | Solid‑solution strengthening | Cost‑effective moderate sour‑gas performance | Low mechanical strength, not fit for high‑load rotating parts | Moderate‑corrosion non‑high‑strength structural parts |
Quick Selection Guidance:
- Pick AMS 5662 Inconel 718 solution‑annealed round bar, if your component requires complex CNC machining / forming / welding and you will perform age‑hardening heat‑treatment afterwards to pursue maximum high‑temperature creep strength for aerospace or oil‑gas high‑load hardware.
- Choose AMS 5663 if you need material delivered in final aged hardness with no in‑house heat‑treatment capacity.
- Switch to Inconel 625 if chloride / sour‑gas corrosion risk outweighs mechanical‑strength requirement.
Equivalent & Alternative Material Reference Table
| If you need... | Consider... | Key Difference |
|---|---|---|
| Same material, Chinese certification | GH4169 (GB/T 14992) | Chemically identical; requires qualification for aerospace |
| Higher temperature capability (>700°C) | Inconel 625 (UNS N06625) | Better oxidation resistance, lower strength |
| Better corrosion resistance in seawater | Inconel 625 | Superior pitting resistance |
| Lower cost, moderate temperature | Inconel 600 / 601 | Lower nickel content, lower strength |
Customization Services
| Parameter | Options |
|---|---|
| Diameter Range | 10 mm – 350 mm (custom sizes available) |
| Length | 1,000 mm – 6,000 mm (custom cut-to-length) |
| Condition | AMS 5662 (solution annealed), AMS 5663 (aged), custom heat treatment |
| Surface Finish | As-rolled, peeled, turned, ground, polished, centerless ground |
| Tolerances | Standard ASTM or customer-specified tight tolerances |
| NDT Inspection | Ultrasonic (UT), eddy current, dye penetrant (PT), magnetic particle (MT) |
| End Preparation | Chamfered, beveled, or as-rolled |
| Marking | Heat number, specification, size per customer requirement |
Specify Exact Form, Dimensions, and Surface Requirements
Be detailed and explicit in your inquiry:
| Parameter | What to Specify |
|---|---|
| Form | Round bar, forged bar, rolled bar, peeled/burnished bar |
| Diameter | Exact size and tolerance (e.g., 50.8 mm ± 0.13 mm) |
| Length | Random lengths, exact lengths, or cut-to-length |
| Condition | AMS 5662 (solution annealed) or AMS 5663 (aged) |
| Surface Finish | As-rolled, peeled, turned, ground, or polished |
| NDT Requirements | Ultrasonic (UT), eddy current, dye penetrant (PT), magnetic particle (MT) |
How do I avoid procurement pitfalls when buying Inconel 718 bar?
Key Check List:
- Verify the standard - AMS 5662 (solution annealed) vs AMS 5663 (aged).
- Confirm the condition - solution annealed for machinability, aged for final strength.
- Check chemical composition - Nb 4.75–5.5%, Mo 2.8–3.3%, Ti 0.65–1.15%.
- Request the Mill Test Certificate (MTC) - confirm compliance to AMS 5662.
- Confirm NACE compliance for oil-gas applications.
- Request PMI verification - on-site spectral testing confirms material authenticity.
- Check multiple melt - VIM + VAR for aerospace critical applications .
Delivery & Commercial Terms
| Item | Details | |
|---|---|---|
| MOQ | Stock standard sizes: 50 kg; Custom ground / special processing: 100 kg; small trial order negotiable | |
| Lead Time | Stock items: 10‑14 working days; Custom‑processed bar: 20‑30 working days | |
| Payment Terms |
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| FOB Port | FOB Shanghai / FOB Qingdao, China (other ports negotiable) | |
| Packaging | Anti‑rust oil, moisture‑proof wrapping, fumigated wooden case / wooden pallet; heat‑number labels attached for each bundle | |
| Certificates | EN 10204 3.1 MTC, chemical & mechanical test reports, heat‑lot traceability; PMI, UT and third‑party inspection available upon customer request |
Typical Application Fields for AMS 5662 UNS N07718 Round Bar
| Industry | Applications | Why Inconel 718 |
|---|---|---|
| Aerospace | Turbine discs, compressor blades and vanes, jet engine shafts, buckets, spacers, high-temperature bolts and fasteners, landing gear components, rocket motors, thrust reversers | High-temperature strength, creep resistance, fatigue resistance |
| Oil & Gas | Downhole drilling tools, sub-surface safety valves, pump parts and shafts, MWD/LWD tools, sour service components | NACE MR0175 compliance, corrosion resistance, high strength |
| Power Generation | Gas turbine components, nuclear reactor components, cryogenic storage tanks | Oxidation resistance, high-temperature stability |
| Chemical Processing | Pump bodies, valves, fasteners, pollution-control equipment | Corrosion resistance, durability |
| Aerospace Fasteners | High-strength bolting, fasteners, springs | High strength, stress relaxation resistance |
About Us
We are a professional Chinese manufacturer and supplier of high‑performance nickel‑based superalloys. We specialize in Inconel 718 (UNS N07718 / AMS 5662 / GH4169) and other premium nickel‑chromium alloys serving aerospace, oil & gas, power generation and chemical processing industries worldwide.
We deploy advanced VIM, ESR and VAR melting processes. Our products strictly conform to international specifications including AMS 5662, AMS 5663, ASTM B637 and NACE MR0175. Full‑batch material traceability is guaranteed, with Mill Test Certificates (MTC) provided for every shipment.
Our engineering team brings rich hands‑on experience in high‑temperature alloy applications for turbine discs, jet‑engine parts, downhole tools and subsurface safety valves. We deliver professional guidance covering material selection, heat‑treatment options and fabrication advice, helping you optimize component performance and lower total cost of ownership.
We support global export with flexible MOQs, dependable lead times and end‑to‑end technical support. Custom sizes, surface finishes and heat‑treatment solutions are available to match your unique project requirements. Partner with us for reliable high‑performance superalloy solutions featuring consistent quality, competitive pricing and stable global supply‑chain performance.
Our Factory
Vacuum Melting Furnace
Automatic Cold Drawing Line For Expansion Alloy Bars
Solution Annealing Furnace
Rotating+Passing Eddy Current Flaw Detector
Electron Microscope
German Spike Spectral Analyzer
Need AMS 5662 Inconel 718 Round Bar for Your Application?
Tell us your required diameter, length, quantity, and application (aerospace, oil-gas, industrial) . We will confirm availability, provide a quotation, and ship with full documentation. Fast delivery and custom sizes available.
FAQ
Q1: What is the difference between AMS 5662 and AMS 5663 Inconel 718 round bar?
A: AMS 5662 is solution‑annealed condition: material is soft and machinable, no aging precipitation; you need to perform subsequent age‑hardening heat‑treatment to achieve maximum final strength. AMS 5663 is solution‑annealed plus fully age‑hardened condition, delivered at final service hardness, but much harder for CNC machining.
Q2: Is AMS 5662 Inconel 718 round bar VIM‑VAR remelted?
A: Standard stock material is air‑melt. We provide VIM+VAR double‑remelted Inconel 718 round bar for critical aerospace applications upon customer request, which delivers higher material purity and stable high‑temperature creep‑rupture performance. Please specify melting requirement in your inquiry.
Q3: Can I weld AMS 5662 Inconel 718 bar stock?
A: Yes, welding can be completed in solution‑annealed AMS 5662 state. After welding, age‑hardening heat‑treatment is required to restore full mechanical strength for final service. ERNiFeCr‑1 welding consumable is recommended for Inconel 718 welding.
Q4: When should I select Inconel 718 AMS 5662 instead of Inconel 625 for oil‑gas & aerospace projects?
A: Choose AMS 5662 Inconel 718 when your component's main demand is ultra‑high mechanical strength and high‑temperature creep‑rupture resistance, and you can implement post‑machining aging heat‑treatment. Select Inconel 625 if your main failure risk comes from chloride or sour‑gas corrosion instead of mechanical load.
Q5: Do you offer custom sizes and fast delivery for AMS 5662 UNS N07718 round bar?
A: Yes. We deliver custom sizes service for special diameter, cut‑length and surface finish. Standard‑spec bar stock supports fast delivery. Send your drawing for accurate lead‑time assessment.
Q6: What documents can you provide for aerospace‑grade AMS 5662 Inconel 718 round‑bar order?
A: Full EN10204‑3.1 MTR mill test report complying with AMS 5662; PMI positive‑material‑identification report; melting‑process certificate for VIM‑VAR remelted material; third‑party witness inspection can be arranged as buyer's requirement.
Q7: What is AMS 5662 Inconel 718 round bar used for?
A: AMS 5662 Inconel 718 bar is used for aerospace gas turbine components, high-strength fasteners, downhole drilling tools, sub-surface safety valves, wellhead components, and cryogenic tankage . It is chosen when you need the highest strength available in a nickel superalloy (150 ksi yield) combined with good corrosion resistance and excellent weldability.
Q8: When should I choose Inconel 625 instead of Inconel 718?
A: Select Inconel 718 (AMS 5662) if you prioritize high‑temperature mechanical strength after aging. Choose Inconel 625 UNS N06625 for heavily corrosive sour‑gas environments, though its high‑temperature strength is lower than Inconel 718.
Q9: Can AMS 5662 bar be used without customer aging heat‑treatment?
A: It works for low‑stress non‑critical components. For aerospace, high‑load oil‑gas parts, you must complete precipitation aging after machining to reach required mechanical strength.
Q10: Is Inconel 718 suitable for sour service?
A: Yes. Inconel 718 is approved under NACE MR0175/ISO 15156 for oilfield service, with a maximum hardness limit of 45 HRC (since 2018) . It is used for wellheads, tubing hangers, packers, and downhole production components at risk of environmentally-assisted cracking. NACE compliance documentation available.
Q11: What is the maximum service temperature of Inconel 718?
A: Inconel 718 is used at temperatures up to 1300°F (704°C) for high-strength applications . It maintains yield strength ≥862 MPa at 650°C . For higher temperature service (up to 980°C), consider Inconel 625.
Q12: Can Inconel 718 be welded?
A: Yes. Inconel 718 has outstanding resistance to post-weld cracking - it was specifically developed to avoid the strain-age cracking problems common to gamma-prime strengthened alloys like Waspaloy . Recommended: TIG welding with Inconel 718 filler. Interpass temperature should not exceed 100°C .
Q13: What is the one-line rule for choosing AMS 5662 Inconel 718?
A: Choose AMS 5662 Inconel 718 round bar when you need the highest strength available in a nickel superalloy (150 ksi yield when aged), combined with good corrosion resistance, excellent weldability, and full AMS/NACE compliance for aerospace and oil-gas applications.
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