ZYTC Alloy Completes Alloy 718 Round Bar Export to Germany – Precision That Matters
At ZYTC Alloy, we believe that quality is not a matter of degrees—it is a standard. Recently, we successfully completed and delivered an order of Alloy 718 round bar to a German client, manufactured strictly in accordance with AMS 5663P specifications. The product was supplied in the solution-treated and precipitation-aged (mill-annealed and aged) condition, with dimensions of 115(+2) × 160(+5) mm.
During our final inspection, we discovered that four (4) pieces measured 0.3 mm longer than the contract tolerance. While this deviation might seem negligible to some, at ZYTC Alloy, 0.3 mm is 0.3 mm over the limit. With ample delivery lead time, we re-cut the excess length on all four pieces, bringing them back to full contract compliance. The Alloy 718 round Bars passed final inspection and were shipped to the client with full certification.
This is who we are. ZYTC Alloy operates with standardized, process-driven, and professional production and inspection protocols. We do not cut corners—we cut materials to spec.
What Is Alloy 718?
Alloy 718 (UNS N07718, W.Nr. 2.4668) is an austenitic nickel-based superalloy that is precipitation-hardenable through the addition of niobium (columbium). It exhibits exceptional high yield tensile strength and creep-rupture properties at temperatures up to 1300°F (704°C), along with oxidation resistance up to 1800°F (982°C). The sluggish age-hardening characteristics of Alloy 718 allow for annealing and welding without the risk of spontaneous hardening during heating and cooling.
Alloy 718 is non-magnetic, maintains significant corrosion and oxidation resistance, and is widely used in critical applications including jet engines, gas turbines, rocket motors, nuclear reactors, downhole drilling components, and high-temperature fasteners.
Chemical Composition of Alloy 718 (AMS 5663)
| Element | Weight % (AMS 5663 Range) |
|---|---|
| Nickel (Ni) | 50.00 – 55.00 |
| Chromium (Cr) | 17.00 – 21.00 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.20 – 0.80 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 0.35 |
| Silicon (Si) | ≤ 0.35 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.015 |
| Copper (Cu) | ≤ 0.30 |
| Cobalt (Co) | ≤ 1.00 |
Source: AMS 5663 specification / industry-standard ranges
Mechanical Properties of Alloy 718 (AMS 5663 – Aged Condition)
| Property | Value (Minimum) |
|---|---|
| Ultimate Tensile Strength | ≥ 185 ksi (≈ 1276 MPa) |
| Yield Strength (0.2% Offset) | ≥ 150 ksi (≈ 1034 MPa) |
| Elongation (in 4D / 50 mm) | ≥ 12% |
| Reduction of Area | ≥ 15% |
| Hardness (Brinell) | ≥ 331 HB |
Based on longitudinal specimens tested at room temperature per ASTM E9/E8M
Key Applications of Alloy 718
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Aerospace: turbine discs, shafts, engine mounting brackets, structural hardware, jet engine components
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Power Generation: gas turbine components, power turbine rotors
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Oil & Gas: downhole drilling components, sub-surface safety valves, pump parts and shafts
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Nuclear Industry: reactor cores, primary coolant circuits, reactor support structures
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Cryogenic & Petrochemical: pressure vessels, heat exchangers, storage tanks
Alloy 718 vs. Alloy X750 – Key Differences
While both Alloy 718 and Alloy X750 (UNS N07750) are precipitation-hardened nickel superalloys, they differ significantly in composition, strengthening mechanisms, and performance envelopes.
| Feature | Alloy 718 (UNS N07718) | Alloy X750 (UNS N07750) |
|---|---|---|
| Nickel Content | 50.0 – 55.0% | ≥ 70.0% |
| Chromium Content | 17.0 – 21.0% | 14.0 – 17.0% |
| Niobium (Nb) Content | 4.75 – 5.50% | 0.70 – 1.20% |
| Iron Content | Balance | 5.0 – 9.0% |
| Primary Strengthening Phase | γ″ (Ni₃Nb) | γ′ (Ni₃Al,Ti) |
| Room-Temperature Yield Strength | 1,034 – 1,241 MPa | 690 – 1,100 MPa |
| Maximum Service Temperature | ~650°C (optimal) | ~870°C |
| Weldability | Excellent | Requires careful practice |
Alloy 718 achieves higher room-temperature yield strength through a dominant γ″ (Ni₃Nb) precipitate phase, which forms in greater volume fraction due to its higher niobium content. Alloy 718 is also significantly easier to weld and less susceptible to strain-age cracking compared to Alloy X750. At temperatures above 650°C, however, the γ″ phase in Alloy 718 transforms to the stable delta (δ) phase, reducing strength above 700°C—whereas Alloy X750's γ′ phase remains effective to approximately 870°C.
Alloy 718 also demonstrates superior stress corrosion cracking (SCC) resistance relative to Alloy X750 in high-temperature water environments. For applications requiring maximum yield strength below 650°C with excellent weldability, Alloy 718 is the material of choice.
ZYTC Alloy – Your Trusted Alloy 718 Partner
ZYTC Alloy is a professional manufacturer and supplier of Alloy 718 in a comprehensive range of product forms:
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Alloy 718 Sheet
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Alloy 718 Strip
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Alloy 718 Wire
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Alloy 718 Bar / Round Bar
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Alloy 718 Tube / Pipe
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Alloy 718 Custom Components
We accept custom drawings and tailored specifications. Every order is produced and inspected in strict compliance with international standards, including:
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Sheet, Strip and Plate: AMS5596, AMS5597
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Seamless Tube: AMS5589, AMS5590
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Bars, Forgings, Rings: AMS5662, AMS5663, AMS5664, API 6ACRA, ASTM B637
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Welding Wire: AMS5832
We offer fast delivery, competitive pricing, and uncompromising quality. Whether you need Alloy 718 round bar for aerospace fasteners, Alloy 718 plate for pressure vessels, or Alloy 718 forgings for turbine components—ZYTC Alloy delivers.
Contact ZYTC Alloy Today
For inquiries on Alloy 718, Alloy X750, or any other nickel-based superalloy products, contact our sales team. Let us show you what standardized, process-driven, and professional really means.
