Ferralium is the world’s first super duplex stainless steel developed by Langley Alloys in 1967.
Super duplex stainless steels benefit from a combined microstructure of austenite and ferrite, which provides an optimum mix of properties.
The difference in properties between austenitic and duplex stainless steels is explained by their different microstructures.
Duplex, Super Duplex and Hyper Duplex have a combination of austenitic and ferritic microstructures, approximately 50:50.
There are a number of different austenitic stainless steels, the most common being the 300 series (304/316) produced in large volumes.
There are several different types of stainless steel including Austenitic, Ferritic, Martensic and Duplex grades.