Duplex stainless steel is a type of stainless steel with a two-phase microstructure consisting of both austenitic and ferritic phases. The composition of duplex stainless steel typically includes a combination of elements such as chromium, nickel, molybdenum, and nitrogen, which provide its unique properties.
To make duplex stainless steel, the raw materials are melted in a furnace, typically an electric arc furnace or an induction furnace. The composition of the raw materials is carefully controlled to achieve the desired chemical composition of the final product.
The molten steel is then cast into the desired shape using a variety of casting techniques, such as continuous casting or sand casting. The cast steel is then subjected to a series of heat treatments, including annealing and quenching, to improve its mechanical properties and ensure that it is free from defects.
After heat treatment, the duplex stainless steel is typically cold worked to improve its strength and toughness. Cold working techniques such as rolling, forging, and drawing are commonly used to achieve the desired properties. Finally, the duplex stainless steel may be subjected to various finishing processes, such as polishing, sandblasting, or coating, to improve its appearance and resistance to corrosion.