duplex
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These are characterized by having both austenite and ferrite in their microstructure, hence the name Duplex Stainless Steel. Duplex stainless steels have high Chromium content (between 18 and 28%) and a narrow Nickel range (between 4 - 7%). A ferrite matrix with islands of austenite characterizes the lower nickel grades, and an austenite matrix with islands of ferrite characterizes the higher nickel range.<br> They are better than austenitic and ferritic steels in tensile and yield strength while offering good weldablity and formability. When the matrix is ferrite, the alloys are resistant to chloride stress corrosion cracking. When the matrix is austenitic, the alloys are sensitive to chloride stress corrosion cracking.<br>
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