ASTM B670-07(2018) is Standard Specification for Precipitation-Hardening Nickel Alloy (UNS N07718) Plate, Sheet, and Strip for High-Temperature Service. ASTM B670 UNS N07718 is a high-strength, corrosion-resistant, and heat-resistant alloy, Inconel 718 used in applications that require excellent mechanical properties and resistance to high-temperature environments.
Here are some of the key properties and characteristics of ASTM B670 UNS N07718:
1. High Strength: Inconel alloy 718, as specified in ASTM B670, exhibits high tensile and yield strength, making it suitable for applications in which strength and reliability are critical.
2. Corrosion Resistance: This nickel alloy 718 offers excellent resistance to corrosion, including resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC). It is often used in harsh environments, including marine and aerospace applications.
3. High-Temperature Performance: ASTM B670 UNS N07718 plates and sheets maintain their mechanical properties at elevated temperatures. It is capable of withstanding temperatures ranging from cryogenic conditions up to around 704°C (1,300°F), making it ideal for applications involving high-temperature exposure.
4. Fatigue Resistance: Nickel Inconel 718 exhibits good fatigue resistance, which is important in applications subject to cyclic loading and stress, such as gas turbine engines and aerospace components.
5. Weldability: UNS N07718 can be readily welded using common welding techniques, although post-weld heat treatment is typically required to restore its full strength and corrosion resistance.
6. Creep Resistance: Inconel 718 plate demonstrates excellent creep resistance, making it suitable for use in applications where materials are subjected to prolonged stress at high temperatures.
7. Chemical Compatibility: 2.4668 Inconel 718 is compatible with various chemicals and is often used in chemical processing equipment.
8. Dimensional Stability: ASTM B670 UNS N07718 plates and sheets maintain dimensional stability even under high-temperature conditions.
Keep in mind that the specific mechanical and physical properties can vary depending on factors such as heat treatment, manufacturing processes, and the specific application requirements. Therefore, it's important to refer to the ASTM B670 specification and consult with material engineers or suppliers for detailed information regarding the properties of Inconel 718 as per ASTM B670.
