UNS S32750

UNS S32750 is a super duplex stainless steel known for its high strength and excellent corrosion resistance. Super duplex stainless like duplex, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that super duplex has a higher Molybdenum and Chromium content which gives the material greater corrosion resistance.

Super duplex has the same benefits as its counterpart – it has lower production costs when compared with similar ferritic and austenitic grades and due to the materials increased tensile and yield strength, in many cases this gives the purchaser the welcomed option of purchasing smaller thicknesses without the need to compromise on quality and performance.

Composition: UNS S32750 contains a high percentage of chromium (around 25%), molybdenum (about 3.6%), and nickel (approximately 7%), along with other elements like nitrogen and iron. This composition gives it superior resistance to corrosion, especially in environments that are highly corrosive or prone to chloride stress corrosion cracking.

Super Duplex Structure: This steel is classified as “super duplex” because it has a dual-phase microstructure—about 50% austenite and 50% ferrite. This combination provides excellent mechanical properties, such as high strength and good resistance to both pitting and crevice corrosion.

Corrosion Resistance: UNS S32750 is highly resistant to corrosion in aggressive environments, including sea water, acids, and chloride-rich solutions. It is often used in applications where standard stainless steels might not perform well, like in offshore oil and gas rigs, chemical processing plants, and desalination plants.

Mechanical Properties: It has excellent strength compared to standard austenitic stainless steels, making it suitable for applications that require both strength and corrosion resistance.