Stainless Steel Materials, Grade 321


  • Type 321 is similar to SS 304, however, it contains a Titanium addition of at least five times the carbon content, this addition is made to reduce or eliminate chromium carbide precipitation – resulting from welding or exposure to high temperatures.
  • Maximum stabilisation is accomplished by annealing between 1750°C and 1850°C; mainly used in aircraft exhaust stacks and manifolds, chemical processing equipment, welded equipment, jet engine parts, petrochemical and other fertilizer industries.
  • Can be used for exhaust systems where operating temperatures are higher than 800°F and where corrosive conditions are not too serve, also because of its resistance to scaling and vibration fatigue.