Duplex stainless steels are the most recent development; son aleaciones cromo-níquel-molibdeno que forman una mezcla de cantidades aproximadamente iguales de Austen y ferrita. However, the amount of nickel is sufficient to fully develop the austenitic crystal structure. The chromium content varies from 18 to the 26%, and the nickel content of 4,5 at 6,5%. The addition of elements such as nitrogen, molybdenum, copper, silicon, Tungsten provides certain attributes and resistance to corrosion.
Its features are as follows:
• They are magnetic.
• They can not be hardened by heat treatment.
• Good weldability.
• The duplex structure improves the resistance to fracture under stress corrosion in environments with chloride ions.
duplex
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