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321 stainless steel coils are widely used in the chemical and petrochemical industries for manufacturing high-temperature corrosion-resistant equipment components, such as reactor liners, heat exchanger sheets, and high-temperature pipeline cladding, as they resist intergranular corrosion even after long-term exposure to environments up to 800°C. In the aerospace sector, they are applied to produce aircraft engine exhaust system parts, fuel system components, and aircraft structural panels, benefiting from excellent high-temperature strength and oxidation resistance. They also find applications in thermal power plants (for high-temperature steam pipeline liners) and food processing machinery (for sterile fluid contact sheets), ensuring reliable performance in both high-temperature aggressive and hygienic-demanding scenarios.