Stainless Steel Alloy 904L


Type 904L is a high alloy austenitic stainless steel that is known for its corrosion properties. This low carbon version of Type 904 stainless steel also offers other benefits to users including:

  • Non-magnetic
  • Stronger corrosion properties than Type 316L an 317L
  • Good resistance to sulphuric, phosphoric and acetic acids
  • High resistance to crevice and stress corrosion cracking
  • Excellent formability and weldability

Due to all of the benefits of using Type 904L stainless steel, it can be found in a number of applications in wide variety of critical industries including:

  • Cooling equipment for seawater
  • Chemical processing of sulphuric, phosphoric and acetic acids
  • Heat exchangers
  • Condenser tubes
  • Gas washing
  • Control and instrumentation
  • Oil and gas industry
  • Pharmaceutical production
  • Wiring in electrostatic precipitators

To be considered Type 904L, a stainless steel must have a unique chemical composition that includes the following:

  • Fe balance
  • Ni 23-28%
  • Cr 19-23%
  • Mo 4-5%
  • Mn 2%
  • Cu S 1-2.0%
  • Si 0.7%
  • S 0.3%
  • N 0.1%
  • P 0.03%