Duplex stainless steel pipes refer to those stainless steel pipes with a two-phase structure of austenite and ferrite, which combines the excellent toughness and corrosion resistance of austenitic stainless steel pipes with the higher strength and lower nickel content of ferritic stainless steel pipes. The chromium content of duplex stainless steel pipes is usually between 18% and 28%, the nickel content is between 4% and 8%, and it usually contains a certain amount of molybdenum and other alloying elements to improve its performance.
