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.
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