Duplex Stainless Steel 2205 Composition

Duplex 2205 is a two phase ferritic austenitic 22 chromium 3 molybdenum 5 to 6 nickel alloyed stainless steel.

Duplex stainless steel 2205 composition. Duplex 2205 also known as uns s32205 is a nitrogen enhanced stainless steel. Duplex 2205 data sheet specification. 2205 is a duplex stainless steel with a chemical composition of nearly equal proportions of austenite and ferrite. Duplex s tainless steel are extremely corrosion resistant work hardenable alloys.

2205 is the most widely used duplex ferritic austenitic stainless steel grade. Applications include chemical processing oil and gas exploration marine and other high chloride environments and paper digestors. However it is only in the last 30 years that duplex steels have begun to take off in a significant way. Its high chromium and molybdenum content gives the stainless steel excellent corrosion resistance.

The following table lists alloy 2205 stainless steel chemical composition based on cast. Saf 2205 also known as sandvik saf 2205 is a sandvik owned trademark for a 22cr duplex ferritic austenitic stainless steel. Their microstructures consist of a mixture of austenite and ferrite phases. Combining many of the beneficial properties of both ferritic and austenitic steels 2205 is the most widely used duplex stainless steel grade.

The microstructure provides resistance to stress corrosion cracking and ensures high strength. It is important to note that duplex 2205 offers much higher levels of corrosion resistance than most other austenitic stainless steels. Saf derives from sandvik austenite ferrite the nominal chemical composition of saf 2205 is 22 chromium 5 nickel 3 2 molybdenum and other alloying elements such as nitrogen and manganese. Its most important properties are excellent corrosion resistance and high strength.

This combination of properties can mean some compromise when compared with pure austenitic and pure ferritic grades. It is the most widely used duplex stainless steel grade and is characterized by high yield strength double that of the standard austenitic stainless steel grades. The idea of duplex stainless steels dates back to the 1920s with the first cast being made at avesta in sweden in 1930. This combination allows the alloy to be stronger and tougher than standard austenitic steels.

As a result duplex stainless steels display properties characteristic of both austenitic and ferritic stainless stee ls. The uns designation for saf 2205 is s31803 s32205 and the en steel no.