SS904L Mechanical and Physical Properties

by Aditya Pandit


Posted on July 17, 2017 at 5:30 PM



A grade 904L stainless steel is a stainless austenitic non-stabilized steel with very low carbon content. The alloy is stainless steel added with copper to improve its resistance against strong reducing acids like the sulphuric acid.

The steel is also resistant to stress corrosion cracking and crevice corrosion and is also non-magnetic. It offers excellent toughness, formability and weldability.

Grade 904L Stainless Steel contains high amounts of expensive metals, such as nickel and molybdenum.

Grade Carbon Manganese Silicon Phosphorus Sulfur Chromium Molybdenum Nickel Copper
904L min. - - - - - 19 4 23 1
904L max. 0.02 2 1 0.045 0.035 23 5 28 2

Source: Composition ranges of grade 904L stainless steels

The mechanical properties of grade 904L are:

 Steel Grade

      Tensile             Strength        (MPa) min

   Yield Strength 0.2%          Proof (MPa) min

   Elongation

 (% in 50mm) min

                Hardness

 Rockwell B    (HR B)

  Brinell (HB)

    904L

   490.0

     220.0

      36.0

   70.0-90.0

    150.0

Corrosion

904L stainless steels possess excellent resistance to warm seawater and also from chloride attack. The above the normal resistance in grade 904L against stress corrosion cracking is due to the presence of high amounts of nickel. The alloy is less resistant to nitric acid than grades 304L and 310L.

Welding

Grade 904L stainless steels also have excellent weldability which can be performed using all conventional methods. This steel does not require pre-heat and post-weld heat treatments.

Heat Resistance

The steel structure collapses only at a temperature above 400 C.

Applications

The 904L is used in

  • Oil refinery components
  • Pulp and paper processing industries
  • Gas scrubbing plants
  • Wiring in electrostatic precipitators
  • Acetic, phosphoric and sulphuric acid processing plants
  • Seawater cooling devices

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