309(S) Stainless Steel Coil

Description:

Types 309 Stainless Steel and 309S are austenitic chromium-nickel stainless  steels that provide excellent corrosion resistance and heat resistance plus good  strength at room and elevated temperatures. Type 309S Stainless Steel is  identical to Type 309 except for a lower carbon content that minimizes carbide  precipitation and improves weldability. They are essentially nonmagnetic as  annealed and become lightly magnetic when cold worked.

Specifications:

ASTM A167 (309), ASTM A240 (309S)

Typical Applications:

furnace parts, heating elements, aircraft and jet engine parts, heat  exchangers, sulfite liquor handling equipment, kiln liners, boiler baffles,  refinery and chemical processing equipment, and auto exhaust parts

Chemical Composition: (A167, A240)

Mechanical Properties: (ASTM A167, A240)

Physical Properties:

Processing:

These alloys are not hardenable by heat treatment. Anneal at 1900 - 2050°F  (1038 - 1121°C), then water quench or rapidly air cool.

Forming:

Types 309 and 309S Stainless Steels can be roll formed, stamped and drawn  readily. In-process annealing is usually required to reduce hardness and  increase ductility.

Welding:

Type 309 is generally considered to have weldability nearly equivalent to the  most common alloys of this class, Types 304 and 304L. When a weld filler is  needed, AWS E/ER 309 and 310 are most often specified.

Corrosion:

Types 309 and 309S provide excellent general corrosion resistance. They are  more resistant to marine atmospheres than Type 304. They exhibit high resistance  to sulfite liquors and are useful for handling nitric acid, nitric-sulfuric acid  mixtures, and acetic, citric, and lactic acids.