50 grades of stainless steel

The BSSA has selected 50 Grades of Stainless Steel as its theme for 2014. Each week throughout the year, we will showcase one grade and illustrate the variety of corrosion resistant, mechanical and physical properties which determine its suitability for a wide range of applications.



310 MoLN 1.4466 S31050

310 MoLN is a highly alloyed austenitic stainless steel grade. It is based on 310 with additions of molybdenum and nitrogen and a lower carbon content. In contrast to 310, which is used for heat resistance, it is used for its corrosion resistance especially in the production of urea.

Approximate Composition - 25% Cr, 22% Ni, 2.0% Mo, < 0.030% C, 0.12% N (Exact composition ranges vary between EN and ASTM standards).

This grade combines the following characteristics:

  • Excellent resistance to pitting and crevice corrosion – typical PREN 34
  • Excellent resistance to ammonium carbamate, an intermediate compound in urea production
  • Slightly higher 0.2% PS compared to standard austenitic grades due to high alloy content especially nitrogen – 255 MPa minimum
  • Fully austenitic structure (< 0.5% ferrite) requires care in welding to avoid hot cracking.

This grade is an example of a development aimed at a specific chemical production process, namely urea. Its high level corrosion resistance (PREN ~34) allows it to be used in other highly corrosive environments.

Applications include:

Urea production, pulp and paper, flue gas desulphurisation.

Find out more about the 50 Grades of Stainless Steel campaign

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310 MoLN 1.4466 S31050