Duplex Stainless Steel Group is intermediate in terms of structure and alloy content between ferritic and austenitic stainless steel. The main characteristic that differentiates Austenitic-ferritic steel from austenitic and ferritic stainless steel 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.
Duplex Stainless Steels are normally named Duplex stainless steel pipes due to the two phases present in the microstructure. Typically twice the yield of austenitic stainless steel. Minimum Specified Ultimate Tensile Strength typically 680 to 750N/mm2 (98.6 to 108ksi). Elongation typically > 25%.
