Materials

• 200 Series—These are austenitic stainless steel alloys.  These materials are non-magnetic and have high strength with exceleent formability.
  
  • Type 201
  • Type 202
  • Type 203
  • Type 204
  • Type 205
    

• 300 Series—These are austenitic stainless steel alloys.  These materialsare non-magnetic and has good formability.
  
  • Type 301
  • Type 302— same as 304 but with higher strength.
  • Type 303— has a higher iron content than 304.
  • Type 304— the most common grade of stainless steel.
  • Type 304L— contains less carbon than 304.
  • Type 308
  • Type 309
  • Type 316—the second most common grade of stainless steel. 
  • Type 321—similar to 304
    

• 400 Series—These are ferritic and martensitic chromium stainless steel alloys.
  
  • Type 405
  • Type 408
  • Type 409
  • Type 410
  • Type 416r
  • Type 420—great polishability for 400 alloys.
    
  • Type 430
  • Type 440—one of the hardest stainless steels alloys.
  • Type 446

• Precipitation Hardening Series--These are either martensitic
  or austenitic stainless steel alloys.
  
  • Type 15-5
  • Type 15-7
  • Type 17-4
  • Type 17-7

• Duplex--These are more stress resistant alloys, and has a composition of chromium, nickel, and molybdenum.
  
  • Type 329
  • Type 2205
  • Type 2304
  • Type 2507
  • Type 3RE60

Content courtesy of Electropolish.com.