Stainless Steel Alloy 2304, Duplex 2304

Duplex 2304, also called Alloy 2304, is a molybdenum-free duplex stainless steel. It has a structure that is a balance of ferritic and austenitic and is often used as a replacement for Alloys 304L and 316L. Some of Duplex 2304 stainless steel’s other properties include:

  • Outstanding corrosion resistance
  • Yield strength (twice that of 304L/316L)
  • Suitable for applications covering -50ºC/+300ºC temperature range
  • Resistance to pitting and crevice corrosion
  • Improved machinability and weldability

Because of these positive qualities Duplex 2304 is commonly used in a range of applications for a variety of industries.  These include:

  • Pulp and paper industry (pipes, storage tanks)
  • Food industry
  • Pressure vessels
  • Mining
  • Exposure to caustic solutions and organic acids
  • Water treatment
  • Construction and architecture

For a stainless steel to be labeled Duplex 2304, it must contain a number of different components including:

  • Fe Balanced
  • Cr 21.5-24.5%
  • Ni 3.0-3.5%
  • Mn 2.5% max
  • Cu .05%-2.0%
  • N .05-2.0%
  • Si 1% max

Continental Steel offers a wide range of forms and sizes of Duplex 2304, all of which meet the leading industry standards like ASTM, ASME, EURONORM, and DIN.


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