CLC 18-12-4LN (317LN) is a Nitrogen alloyed austenitic stainless steel with a 3% Mo addition. Its austenitic microstructure is free of deleterious carbide precipitations at grain boundaries. The grade contains some residual ferrite after solution annealing (1100 - 1150°C / 2012 - 2102°F) and water quenching.

This steel has a higher resistance to corrosion in chlorides environments than standard grades (CLC17-12-2L / 316L). Nitrogen additions improves sructure stability, increases the yield strength and improves its pitting corrosion resistance.

Its main properties are : good mechanical properties, high ductility and improved corrosion resistance.

The main applications are chemical and petrochemical applications and chemical tankers.