Alloy 904L

Alloy 904L (UNS N08904)

High performance austenitic stainless steels Alloy 904L (UNS N08904) differ substantially from more conventional grades with regard to resistance to corrosion and, in some cases, also mechanical and physical properties. This is mainly due to the high contents of chromium, nickel, molybdenum and nitrogen. High performance austentic stainless steels have good weldability and excellent formability.
The high content of alloying elements gives the steel exceptionally good resistance to uniform corrosion.
Conventional stainless steels are sensitive to stress corrosion cracking (SCC) under certain conditions, i.e. a special environment in combination with tensile stress in the material and often also an elevated temperature. Resistance to SCC increases with the increased content of nickel and molybdenum. This implies that the high performance austenitic steels 904L have very good resistance to SCC.
Nano-Mag Technologies offer various products made from Alloy-904L material including Autoclave, Reactor, Hydrogenators, Magnetic Drives, Catalyst Filters etc. as per the requirement.
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Characteristics of Alloy 904L

  • Very good resistance to uniform corrosion
  • Good to exceptionally good resistance to pitting and crevice corrosion
  • Very good resistance to various types of stress corrosion cracking
  • Very good ductility
  • Good weldability
  • Excellent formability

Chemical Composition:


Indicative Corrosion Data

Alkaline & SaltsGood
Hydrochloric AcidNot Suitable
Hydrofluric AcidNot Suitable
Nitric AcidNot Suitable
Organic AcidGood
Phosphoric AcidGood
Sulfuric AcidNot Suitable

Corrosion rates may vary at different concentrations and temperatures . Each user is advised to carry out their own corrosion test with sample coupon

Material Specification

Plate, Sheet & StripSA-240A-24017750
Rod & BarSA-276A-27617752
Seamless Pipe & TubeSA-312A-31217551
Welded PipeSA-312A-312-
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Alloy 904L High Pressure Autoclave50 ml-100 litres, Upto 350 bar, 500°C
Alloy 904L High Pressure Reactors
Alloy 904L Hydrogenators
50 ml -50000 litres, Upto 150 bar, 500°C
Alloy 904L Continuous Stirred Tank Reactor50 ml-100 litres, Upto 350 bar, 500°C
Alloy 904L Non-Stirred Pressure Vessels50 ml-100 litres, Upto 350 bar, 500°C
Alloy 904L Catalyst Filters for Precious MetalsAs per requirement
Alloy 904L Magnetic DriveAs per requirement
Alloy 904L Mini Magnetic CouplingNano-20, Nano-40, Nano-80

All Products, Product Specifications and Data are subject to change.

  • Process equipment in chemical industry
  • Bleaching equipment in the pulp and paper industry
  • Flue gas cleaning
  • Desalination
  • Seawater handling
  • Hydrometallurgy
  • Food and beverage
  • Pharmaceuticals
  • Heat exchangers