In the fields of aerospace and power generation, where components must perform under extreme heat, pressure, and stress, the choice of material defines success or failure. Among the most advanced materials available today, Nickel Alloy 716 Round Bar has gained wide recognition for its outstanding combination of strength, oxidation resistance, and corrosion resistance.
This precipitation-hardenable nickel-chromium-iron alloy, strengthened with molybdenum and niobium, offers exceptional creep and fatigue resistance, making it suitable for jet engine parts, gas turbines, steam power systems, and energy conversion equipment.
In this article, we will explore the chemical and mechanical characteristics of Nickel Alloy 716, its key advantages, and its specific applications in the aerospace and power generation industries. We will also explain why SASAALLOY continues to be a trusted global supplier for this high-performance alloy.
1. Understanding Nickel Alloy 716
Nickel Alloy 716, often referred to as Inconel 716, is a derivative of the well-known Inconel 718, offering a refined balance of mechanical properties and stress rupture performance. It maintains excellent strength at both room and elevated temperatures while providing superior weldability and fabricability.
Typical Chemical Composition:
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Nickel (Ni): 50-55%
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Chromium (Cr): 17-21%
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Iron (Fe): balance
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Molybdenum (Mo): 2.8-3.3%
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Niobium + Tantalum (Nb+Ta): 4.75-5.5%
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Titanium (Ti): 0.65-1.15%
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Aluminum (Al): 0.2-0.8%
This specific composition allows the alloy to resist oxidation, carburization, and thermal fatigue, making it ideal for components exposed to high-temperature service environments.
2. Key Mechanical Properties
The Nickel Alloy 716 Round Bar is designed to deliver strength and stability under conditions where other metals would deform or fail.
Typical Mechanical Data (at room temperature):
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Tensile Strength: up to 1300 MPa
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Yield Strength: approximately 1000 MPa
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Elongation: ≥ 15%
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Density: 8.19 g/cm³
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Melting Point: around 1330–1380°C
Even at temperatures exceeding 700°C, this alloy retains excellent tensile and creep resistance, which is vital for aerospace engines and turbine blades. Its combination of mechanical durability and oxidation resistance contributes directly to equipment reliability and service life.
3. Advantages of Nickel Alloy 716 Round Bar
Engineers choose Nickel Alloy 716 Round Bar because of its well-balanced performance profile:
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High-Temperature Strength
Maintains mechanical stability and load-bearing capacity under continuous exposure to extreme heat. -
Excellent Oxidation and Corrosion Resistance
Forms a stable oxide layer that protects against oxidation, carburization, and hot gas corrosion. -
Outstanding Fatigue and Creep Resistance
Withstands cyclic stresses and deformation over long operational periods, ensuring reliable turbine and engine operation. -
Good Weldability and Machinability
Unlike some other nickel-based superalloys, 716 can be welded and machined with minimal cracking risk. -
Long-Term Dimensional Stability
Ideal for high-precision components where tight tolerances must be maintained throughout service.
These advantages make Nickel Alloy 716 a preferred choice for mission-critical aerospace and energy components.
4. Applications in the Aerospace Industry
The aerospace sector demands materials that can endure extreme thermal gradients, mechanical vibration, and high stress. Nickel Alloy 716 meets these requirements across several crucial applications.
4.1 Jet Engine Components
Nickel Alloy 716 Round Bar is widely used for turbine shafts, compressor rotors, and fasteners. Its strength retention at elevated temperatures ensures that these components can operate reliably even during rapid acceleration and deceleration cycles.
4.2 Exhaust and Afterburner Sections
The alloy’s oxidation resistance prevents degradation in exhaust ducts, afterburner liners, and nozzle guide vanes, where exposure to hot gases exceeds 900°C.
4.3 Aerospace Fasteners and Bolts
The precipitation-hardening capability of Alloy 716 provides the high strength and fatigue resistance needed for aerospace fasteners, nuts, and studs used in aircraft engines and airframe assemblies.
4.4 Rocket and Space Applications
Due to its ability to maintain stability in cryogenic as well as high-temperature environments, Alloy 716 is also used in rocket engine fuel systems and propulsion assemblies.
In aerospace manufacturing, safety and performance are paramount — and that’s why many leading OEMs rely on SASAALLOY’s Nickel Alloy 716 Round Bars for precision machining and dependable long-term use.
5. Applications in Power Generation
In power generation systems, whether conventional or renewable, temperature extremes and corrosive gases pose constant challenges. Nickel Alloy 716 has become a standard material for gas and steam turbines, nuclear plants, and energy conversion systems.
5.1 Gas Turbine Shafts and Discs
The alloy’s high creep strength and resistance to oxidation make it ideal for rotor shafts, turbine blades, and compressor discs that operate continuously at high temperatures.
5.2 Steam Power Equipment
Nickel Alloy 716 resists scaling and sulfidation, allowing it to be used in superheater tubes, valves, and bolting materials in modern steam turbines.
5.3 Nuclear Power Applications
Because it maintains mechanical integrity under radiation and temperature stress, Alloy 716 is used for fastener assemblies, control rod mechanisms, and pressure vessel internals in nuclear power plants.
5.4 Renewable Energy Systems
In advanced geothermal and hydrogen power projects, the material withstands corrosive geothermal fluids and high-pressure gas environments, making it an efficient long-term investment for clean-energy applications.
By offering reliability, performance, and long service life, Nickel Alloy 716 Round Bar contributes significantly to operational safety and energy efficiency in the power generation sector.
6. Heat Treatment and Processing
Nickel Alloy 716 Round Bar can be heat treated to achieve different mechanical properties, depending on the required performance:
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Solution Annealing: typically at 980°C–1000°C, followed by rapid cooling to optimize grain structure.
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Aging Treatment: around 720°C–780°C to promote precipitation hardening for enhanced strength.
After heat treatment, the material maintains both high yield strength and good ductility, making it suitable for precision-machined turbine and aerospace parts.
7. Fabrication and Machining
While nickel-based alloys are generally difficult to machine due to their work-hardening characteristics, Nickel Alloy 716 offers improved fabricability and weldability. Standard machining techniques with rigid tooling and controlled speeds yield excellent results.
Common fabrication methods include:
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Hot and cold forging
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CNC machining for tight-tolerance parts
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Gas tungsten arc welding (GTAW) and electron beam welding
The result is a component that maintains superior mechanical properties after forming and assembly — a critical factor for aerospace and turbine applications.
8. Quality Control and Standards
At SASAALLOY, each batch of Nickel Alloy 716 Round Bar is manufactured and tested in compliance with the highest international standards:
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ASTM B637
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AMS 5662 / AMS 5663
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EN 10204 3.1 / 3.2 Certification
Every product undergoes strict non-destructive testing, including ultrasonic inspection, hardness testing, tensile verification, and positive material identification (PMI). This ensures that all mechanical and chemical properties meet or exceed client specifications for high-temperature service.
9. Why Choose SASAALLOY
SASAALLOY is a specialized global manufacturer and distributor of nickel-based alloys, stainless steels, and special metals for aerospace, power, and chemical industries. Our advanced production lines and experienced metallurgical engineers guarantee consistent quality and performance.
Advantages of Working with SASAALLOY:
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Reliable quality with full traceability
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Comprehensive stock of standard and custom dimensions
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Precision machining and heat treatment services
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On-time delivery to global customers
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Professional technical support and documentation
From aerospace turbines to power plant equipment, SASAALLOY’s Nickel Alloy 716 Round Bars provide the reliability and performance that engineers demand for critical projects.
10. Conclusion
The success of modern aerospace and power generation systems depends on materials that can endure extreme conditions without compromising performance. Nickel Alloy 716 Round Bar offers precisely that — combining strength, heat resistance, fatigue performance, and corrosion protection into one advanced material solution.
Its proven track record in jet engines, turbines, and nuclear plants demonstrates why it remains one of the most trusted alloys for high-temperature and high-pressure environments. By delivering consistent quality, advanced processing, and expert technical support, SASAALLOY continues to empower industries worldwide with high-performance nickel alloy solutions that ensure reliability, safety, and efficiency.
Post time: Nov-03-2025