Material Matters - Duplex and Super Duplex
Duplex stainless steel, so-called because it has a mixed microstructure with about equal proportions of ferrite and austenite, was first developed more than 70 years ago in Europe.
The key feature of stainless steel is its corrosion resistance, the bulk of which is provided by the chrome content of the steel. Chrome on the surface of the metal reacts with oxygen to form chrome oxide, which is chemically inert and forms a protective layer for the underlying metal. As chrome is intrinsic to the material, wearing away the layer just exposes more chrome, allowing another protective layer to form.
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