Duplex stainless steel coil is a high-performance steel product composed of two metallographic structures, austenite and ferrite, which account for approximately 50% each. Therefore, it has the advantages of both austenitic stainless steel and ferritic stainless steel. This kind of steel has high strength, excellent corrosion resistance, good weldability and thermal processing properties, and is widely used in petroleum, chemical industry, marine engineering, papermaking, food processing and other fields.