Super duplex stainless steel fasteners are made from a combination of austenitic and ferritic steel grades. They are extremely corrosion resistant and have excellent mechanical properties, making them suitable for use in highly corrosive environments. These fasteners are often used in the oil and gas industry, marine applications, and chemical processing. They are available in different grades such as UNS S32750, UNS S32760, and UNS S32950. The main benefits of using this type of fastener include superior corrosion resistance, high strength, and good weldability.