Inconel 718/GH4169/UNS N07718/2.4668/NiCr19Fe19Nb5Mo3 High Temperature Alloy Wire for Critical Components in Aviation Engines

Inconel 718 (also known as GH4169 in China and UNS N07718 globally) is a high-performance nickel-chromium superalloy, commonly used in extreme temperature and pressure environments. The alloy is widely used in aerospace, gas turbine engines, and other high-stress applications due to its excellent mechanical properties, corrosion resistance, and ability to withstand extreme temperatures.

Inconel 718 (GH4169 / UNS N07718 / 2.4668) is a high-strength, corrosion- and oxidation-resistant nickel-chromium superalloy widely used in high-temperature applications like aerospace, gas turbines, and chemical processing. The alloy excels in thermal stability, mechanical properties, and resistance to oxidation. It is commonly available as wires, bars, and other forms, and is capable of operating effectively in extreme conditions, making it ideal for demanding industries such as aerospace, nuclear energy, and high-performance manufacturing.

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Key Characteristics and Properties:

• Mechanical Properties:

Tensile Strength: Typically around 1,270 MPa (185 ksi) at room temperature, but can be higher at elevated temperatures after heat treatment.

Yield Strength: Up to 1,030 MPa (150 ksi) depending on heat treatment.

Elongation: Generally in the range of 40-50%.

Hardness: Can be Rockwell C 30 or higher, depending on the heat treatment and processing conditions.

• Temperature Resistance:

Inconel 718 is specifically designed for high-temperature applications, capable of operating in temperatures as high as 700°C to 900°C (1,300°F to 1,650°F).

Thermal Stability: The alloy maintains high strength and stability at elevated temperatures, making it ideal for applications in environments that involve thermal cycling or high stress.

• Corrosion and Oxidation Resistance:

Excellent resistance to oxidation, corrosion, and creep in high-temperature environments.

Corrosion resistance in a wide range of corrosive environments, including those involving sea water, organic acids, and inorganic acids.

Resistant to stress corrosion cracking in environments that involve both high stress and high temperature.

• Fabrication:

Weldability: Inconel 718 is generally weldable, but the presence of a high amount of niobium and titanium can lead to issues with cracking or embrittlement. Specialized welding techniques, such as argon arc welding (TIG) or electron beam welding, are often employed.

Formability: Can be forged, rolled, or drawn into various forms, including wires, sheets, and bars.

Heat Treatment: Typically heat-treated through solution annealing and aging processes to achieve optimal mechanical properties. The alloy is capable of maintaining its properties after undergoing significant thermal cycling.

• Wire Form:

Available in various forms including wire, rod, bar, sheet, and plate.

Alloy Wire: Inconel 718 is commonly used in wires for applications requiring excellent strength and high temperature resistance, including for electrical heating elements, springs, and fasteners in high-temperature environments.

Applications:

• Aerospace Industry: Used in the manufacture of engine components such as compressor discs, turbine discs, and casings.
• Chemical Processing: Employed in chemical processing equipment, heat exchangers, and pipelines for its resistance to corrosive chemicals.
• Power Generation: Utilized in components of power plants, such as steam generators and heat recovery systems, due to its resistance to high-temperature steam and water environments.

​In summary, GH3044 alloy's combination of high-temperature strength, corrosion resistance, and good fabricability makes it a popular choice for demanding applications where performance under extreme conditions is critical. Its versatility and reliability have led to its widespread use in industries such as aerospace, chemical processing, and power generation.