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Main principle of duplex stainless steels

2016-03-30 17:12:59   COMMENT:0 HITS:
  However, there are some main principles for duplex stainless steels. The basic idea of duplex is to produce a chemical composition that leads to an approximately equal mixture of ferrite and austenite. This balance of phases provides the following. First is higher strength. The range of 0.2% PS for the current duplex grades is from 400 – 550 MPa. This can lead to reduced section thicknesses and therefore to reduced weight. This advantage is particularly significant for applications such as, pressure vessels and storage tanks, structural applications. We still should pay high attention to some special places even duplex steel flange supplies has strong power for the engineering project. The advantage of high strength immediately becomes a disadvantage when considering formability and mach inability. The high strength also comes with lower ductility than austenitic grades. Therefore, any application requiring a high degree of formability, for example, a sink, is ruled out for duplex grades. Even when the ductility is adequate, higher forces are required to form the material, for example, in tube bending. There is one exception to the normal rule of poorer mach inability, grade 1.4162.

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