Stainless Steel

What are Duplex Stainless Steels?

These are stainless steels containing relatively high chromium (between 18 and 28%) and moderate amounts of nickel (between 4.5 and 8%). The nickel content is insufficient to generate a fully austenitic structure and the resulting combination of ferritic and austenitic structures is called duplex. Most duplex steels contain molybdenum in a range of 2.5 - 4%.

Basic properties of Duplex Stainless Steel

High resistance to stress corrosion cracking
Increased resistance to chloride ion attack
Higher tensile and yield strength than austenitic or ferritic steels
Good weldability and formability

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Common uses of Duplex Stainless Steel

Marine applications, particularly at slightly elevated temperatures

Desalination plant

Heat exchangers

Petrochemical plant

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