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Duplex stainless steels are a family of stainless steels. These are called duplex (or austenitic-ferritic) grades because their metallurgical structure consists of two phases, austenite (face-centered cubic lattice) and ferrite (body centered cubic lattice) in roughly equal proportions.
Duplex stainless steels were developed to overcome some limitations of traditional stainless steel grades, such as the popular 304 and 316 types. Compared to these conventional stainless steels, duplex stainless steels exhibit superior mechanical properties—especially regarding strength and toughness.
Mar 7, 2024 · Duplex Stainless Steels are a specific group of engineering stainless steel materials consisting of the austenitic and ferritic phases in roughly equal proportions in the microstructure. They are widely popular because of their good corrosion resistance, high strength, and ease of fabrication.
Duplex stainless steels are materials that benefit from the properties of both austenitic stainless steels and ferritic stainless steels, as they are made of approximately 50% austenites and 50% ferrites.
What is Duplex Stainless Steel? Duplex stainless steels get their name from their two-phase microstructure. While exact ratios vary by grade, most duplex steels have a structure that is roughly 50-percent austenite and 50-percent ferrite.
Duplex stainless steels are Fe-Ni-Cr alloys consisting of ferritic-austenitic microstructure at room temperature. These steels generally possess beneficial combinations of the austenitic and ferritic phases. Duplex stainless steels exhibit greater toughness and better weldability than ferritic stainless steel (Nilsson, 1992 ).
Oct 5, 2023 · Duplex stainless steels are a family of corrosion-resistant alloys known for their exceptional combination of strength and resistance to corrosion. These materials exhibit a dual-phase microstructure of austenite and ferrite, which imparts unique properties suitable for a wide range of applications.
May 18, 2005 · Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Their microstructures have both austenite and ferrite phases and show properties of both types of stainless steels. The properties, applications and fabrication details are provided for duplex stainless steels.
The achievement of duplex stainless steel is that it combines the best properties of both ferrite and austenite. The result is a range of alloys that provide corrosion resistance, cost competitiveness and high strength.
Jul 22, 2019 · Duplex stainless steels were established as a product family around a chromium content of c. 22%, compared with 16-18% for standard austenitic stainless steels. As suggested by their name, duplex grades exhibit two distinct microstructural phases, that of both austenitic and ferritic.
