Heat-resistant stainless steel is stainless steel with high heat resistance and thermal stress. It is typically used in applications exposed to high temperatures such as industrial furnaces, exhaust systems, and heat exchangers. Heat-resistant stainless steel usually contains a high chromium and nickel content and has excellent oxidation and corrosion resistance at high temperatures. ASTM A297 is commonly used in petrochemical, chemical processing, and power generation industries, where corrosion and high-temperature resistance are critical. These alloys are designed to maintain their strength, shape, and integrity even at temperatures in excess of 1000℃.