This group of steels is intermediate in terms of structure and alloy content between ferritic and austenitic steels.
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The microstructure shows an
image of a duplex stainless steel.
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The main characteristic that differentiates austenitic-ferritic steels from austenitic and ferritic steels is that they have a higher yield strength and tensile strength. They are therefore often used in dynamically stressed machine parts, e.g. suction rolls for paper machines. New areas of application are within the oil, gas and petrochemical sector, seawater-bearing systems and the offshore industry.
These steels are normally named Duplex stainless steels due to the two phases present in the microstructure.