What is a characteristic feature of duplex stainless steels?

A characteristic feature of duplex stainless steels is their high resistance to corrosion. This type of stainless steel is engineered to have a balanced microstructure consisting of both austenitic and ferritic phases, which contributes to its superior corrosion resistance when compared to traditional austenitic or ferritic stainless steels. The presence of both phases enhances the material's ability to withstand various corrosive environments, such as those found in chemical processing, marine applications, and oil and gas. The corrosion resistance is typically significantly better in duplex stainless steels, particularly against stress corrosion cracking, than in other types of stainless steel.

While the other options may touch on properties of different materials, they do not accurately describe duplex stainless steels. For instance, duplex stainless steels are known for good tensile strength rather than low tensile strength, and they typically exhibit some magnetic properties, which is contrary to the weak magnetic properties often associated with austenitic stainless steels. Additionally, duplex stainless steels are generally considered to have good weldability compared to other materials, especially when proper practices and filler materials are used. This combination of high strength and excellent corrosion resistance makes duplex stainless steels a popular choice in various industrial applications.