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Inconel 718 is a high-strength, corrosion-resistant nickel-chromium alloy that is widely used in various high-temperature applications, including aerospace, oil and gas, and nuclear industries. This document provides an overview of the key material properties of Inconel 718, highlighting its mechanical characteristics, thermal properties, and corrosion resistance, which make it a preferred choice for demanding environments.
Tensile Strength: Inconel 718 exhibits excellent tensile strength, typically ranging from 1,270 to 1,380 MPa (185,000 to 200,000 psi) at room temperature.
Yield Strength: The yield strength is approximately 1,034 MPa (150,000 psi) at room temperature, making it suitable for applications requiring high load-bearing capacity.
Elongation: The alloy has an elongation percentage of about 30% in 50 mm (2 in) gauge length, indicating good ductility.
Hardness: Inconel 718 can achieve a hardness of around 35 HRC (Rockwell Hardness Scale) in the heat-treated condition.
Melting Point: The melting point of Inconel 718 is approximately 1,300 to 1,400 °C (2,372 to 2,552 °F), which allows it to maintain structural integrity at elevated temperatures.
Thermal Conductivity: The thermal conductivity of Inconel 718 is about 11.4 W/m·K, which is relatively low compared to other metals, making it suitable for thermal insulation applications.
Coefficient of Thermal Expansion: The coefficient of thermal expansion is approximately 13.2 x 10^-6 /°C, indicating how much the material expands with temperature changes.
Inconel 718 exhibits excellent resistance to a wide range of corrosive environments, including:
Oxidation: The alloy forms a protective oxide layer that enhances its resistance to oxidation at high temperatures.
Pitting and Crevice Corrosion: Inconel 718 is resistant to pitting and crevice corrosion, making it suitable for use in marine and chemical processing environments.
Stress Corrosion Cracking: The alloy has good resistance to stress corrosion cracking, particularly in chloride environments.
Inconel 718 is a versatile and robust alloy that offers exceptional mechanical properties, thermal stability, and corrosion resistance. Its unique characteristics make it an ideal material for applications in extreme environments, ensuring reliability and performance in critical components. Understanding these properties is essential for engineers and designers when selecting materials for high-stress applications.
