Austenitic alloys

304 is the basic austenitic stainless

Alloying modifications result in other common alloys

• 316: better corrosion resistance due to addition of molybdenum
• 304L: better weldability due to a decrease of amount of carbon
• 309 and 310: better heat resistance due to increased amounts of chromium and nickel
• 303: better machinability due to addition of sulfur
• 321: improved corrosion resistance due to addition of titanium
• 347: improved corrosion resistance due to addition of niobium
• 201: less expensive due to reduced amount of nickel

Not necessary to memorize all this. Just important to understand the changes possible by altering alloy composition