Stainless steel as the common ferritic and austenitic stainless steels due to their low chromium content. Duplex stainless steels have a mixed microstructure of austenite and ferrite, the aim usually being to produce a 50/50 mix, although in commercial alloys the ratio may be 40/60. They are characterized by high chromium (19–32%) and molybdenum (up to 5%) and lower nickel contents than austenitic stainless steels. Duplex stainless steels have roughly twice the strength compared to austenitic stainless steels. Their mixed microstructure provides improved resistance to chloride stress corrosion cracking in comparison to austenitic stainless steels Types 304 and 316. The properties of
New South Wales stainless steel carriage stock New South Wales stainless steel carriage stock The New South Wales stainless steel carriage stock was a type of passenger carriage operated by the New South Wales Government Railways from 1961 until 1993. These carriages were mainly used on interstate trains such as the Southern Aurora, which ran between Sydney and Melbourne, its slower counterpart the Spirit of Progress and the Brisbane Limited. They were also used on the Gold Coast Motorail to Murwillumbah. With the demise of locomotive-hauled trains, the majority of the carriages passed to the Australian Railway Historical Society, Canberra and New South Wales Rail Transport Museum