What is the difference between grade 316 and grade 304 stainless steel?

The difference between grade 304 and 316 stainless is that 316 tends to have more nickel and a little molybdenum in the mix. The general mechanical properties of the two metals are mostly comparable.

The increased nickel content and the addition of molybdenum give 316 stainless steel better chemical resistance than 304 stainless steel. It is resistant to acids and chlorides (including salts), making Grade 316 ideal for chemical processing and marine applications.

However, the addition of nickel and molybdenum also makes the 316-grade alloy more expensive than stainless steel 304 per ounce of material.

Also, grade 304 stainless steel has a slightly higher melting point than grade 316. 316 has a melting point range of 2,500°F – 2,550°F (1,371°C – 1,399°C), approximately 50 to 100 degrees Fahrenheit lower than the melting point of grade 304 stainless steel.

Although 304 stainless steel alloy has a higher melting point, grade 316 has better resistance to chemicals and chlorides (such as salt) than grade 304 stainless steel. Grade 316 stainless steel is considered superior when it comes to applications involving chlorinated solutions or exposure to salt.