The 316 stainless steel is defined as austenitic stainless steel and is formed by chromium, nickel and molybdenum. Molybdenum is a metal of transisazione, very hard, characterized by one of the highest melting points. In small quantities it has a hardening effect on steel. The addition of this last element makes the stainless steel 316 even more resistant to corrosion and this is used for equipment in contact with the atmosphere or sea water.