The most common one is the 304, also known in Italy as 18-10, used in a lot of sectors, among which domestic (cutlery, pots), automotive and industrial systems. There is also its low carbon version, the 304L that has a better corrosion resistance.
The improved machinability version of 304 is the 303, which can be found in standard or calcium-treated versions that further improve the machinability and the tool life.
In case a good resistance to chloride-rich environments is required, 316 can be used, even in the low-carbon version (316L) or in the titanium stabilized version (316Ti).
Nitronic 50 has a higher resistance to corrosion in the marine environment than 316, together with higher mechanical properties.