Duplex steel 316Lmod plate sheet

316L Mod Grade stainless steel is a modified version of 316L with additional chemistry modifications to improve its corrosion resistance properties. These modifications include the addition of molybdenum, nitrogen, and a higher nickel content. This modification makes 316L Mod Grade stainless steel more resistant to localized corrosion in harsh environments, such as those encountered in the oil and gas industry. It is low Si, high Mo stainless steel for Urea plants.

Duplex steel 316Lmod plate sheet specification:

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  Standard: ASTM 316 L Modified, 1.4435, X2CrNiMo18.14.3

  
  

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  Thickness: 1.2-100mm

  
  

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  Width: 1000-1500mm

  
  

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  Length: 1000-6000mm

  
  

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  Surface: 2B, No.3, No.4, HL, BA, 8K

  
  

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  Manufacturing process: Hot rolled, cold rolled

  
  

Urea stainless steel 316L Mod 1.4435 Chemical analysis

Urea 316L Mod Mechanical properties

Urea stainless steel 316L Mod 1.4435 Physical properties

Density = 7.9kg/cm3

Urea stainless steel 316L Mod 1.4435 Size range

Hot forming

Hot forming should be carried out in a temperature range of 1200-950°C (2732-1742°F) after the piece has been uniformely heat treated. Final full annealing tremperature is required to obtain the requested microstructure. It will be performed at 1120°-1180°C (2048-2156°F) followed by water quenching.

Cold forming

Due to its fully austenitic microstructure, the alloy can be cold formed without any problem. The higher molybdenum content and cold hardening behaviour of the steel explains that it may require more powerfull equipments than 304 stainless steel.

Pickling

The UREA 316L Modified grade must be used in the as pickled and passivated conditions. Pickling treatment may be performed with a nitro-hydrofluoric acid bath (10-20 % HN03 - 1.5-5% HF) at room temperature (few hours) or 20 minutes approx. at 60°C (140°F). 10-20% H2SO4 - 1.5-5% HF pickling bath may also be used.

316LMod stainless steel Applicaiton:

The UREA 316L Modified grade is designed for the fabrication of lining interiors in Urea units or complementary products (pipes, fittings...).

The alloy is not designed for nitric acid application.