321 Stainless Steel Sheet

Description:

Type 321 Stainless Steel is a stabilized austenitic stainless steel similar  to Type 304 but with a titanium addition of at least five times the carbon  content. This titanium addition reduces or prevents carbide precipitation during  welding and in 800 - 1500°F service. It also improves the elevated temperature  properties of the alloy. Type 321 provides excellent resistance to oxidation and  corrosion and possesses good creep strength. It is used primarily in  applications involving continuous and intermittent service temperatures within  the carbide precipitation range of 800 - 1500°F.

Specifications:

ASTM A240

Typical Applications:

annealing covers, high-temperature tempering equipment, diesel and heavy duty  automotive exhaust systems, firewalls, stack liners, boiler casings, welded  pressure vessels, jet aircraft components, radiant super heaters, bellows and  oil refinery equipment

Chemical Composition: ASTM A240

Mechanical Properties:

Physical Properties:

Processing:

Type 321 is non-hardenable by heat treatment. Annealing: Heat to 1750 -  2050°F, then water quench or air cool. Forming: Type 321 can be readily formed  and drawn. Like most austenitic stainless steels, Type 321 work hardens and may  require annealing after severe forming.

Welding:

This particular alloy is generally considered to have comparable weldability  to Types 304 and 304L. A major difference is the titanium addition that reduces  or prevents carbide precipitation during welding. When a filler is needed,  either AWS E/ER 347 or E/ER 321 is most often specified.

Corrosion:

Type 321 exhibits excellent resistance to organic chemicals, dyestuffs, and a  wide range of inorganic chemicals. It resists nitric acid well and the sulfur  acids moderately. Long-time exposure in the 900 -1500째F range may lower its  general corrosion resistance, but the grade still shows improved resistance to  intergranular corrosion compared to unstabilized grades.