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.
Urea production, pulp and paper, flue gas desulphurisation.