Nickel-based alloys are generally defined as alloys with a nickel content exceeding 30 wt%. Common products typically have nickel content exceeding 50 wt%. Due to their exceptional high-temperature mechanical strength and corrosion resistance, they are classified along with iron-based and cobalt-based alloys as superalloys. These alloys are typically used in high-temperature environments above 540°C and are selected based on the specific application, with different alloy designs used for various purposes. They are widely employed in special corrosion-resistant environments, high-temperature corrosion environments, and equipment requiring high-temperature mechanical strength. Common applications include the aerospace, energy, petrochemical industries, and specialized electronics/optoelectronics fields.