Stainless Steel 317 and 317L are molybdenum-bearing austenitic stainless steels. Due to the molybdenum content of 3-4% 317 and 317L are more resistant to general corrosion and pitting/crevice corrosion than type 304. 317 and 317L are used in the Food, Pharmaceutical, Marine and Architecture industries.

Stainless Steel 321 has similar composition to 304 Stainless Steels but with addition of Titanium. This alloy has excellent resistance to corrosion and is also ideal for high temperature environments.

Type 316 stainless steel is an austenitic grade with added molybdenum. The alloy offers improved corrosion resistance when compared with Type 304, particularly in chloride environments.