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We carry seamless and welded stainless steel and carbon steel pipe. Check out our inventory of steel tubing and piping.

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Pipe Dimensions PDF.

ASTM A309:


Disclaimer: The content of this page is for general information only and is not to be used for engineering or design. The content of this material specification page was compiled from available public sources and authorities on material properties. Although we believe the information to be corrrect, Metal Stock, Inc. is not responsible for the accuracy of any of the material specifications and only presents this data as general information for our customers.

309 is austenitic chromium-nickel stainless steel that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. Type 309S is identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability.

309 provide's 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. These materials are generally considered heat-resisting alloys. Their destructive scaling temperature is about 2000°F (1093°C). They exhibit good scaling resistance in both continuous and intermittent service, but the alloys should not be used above 1800°F (982°C) for intermittent service.

309 Conforms with ASTM A167.

General Information about 309:


309's typical uses include furnace parts, heating elements, aircraft and jet engine parts, heat exchangers, carburizingannealing boxes, sulfite liquor handling equipment, kiln liners, boiler baffles, refinery and chemical processing equipment, and auto exhaust parts.


309 stainless steel can be roll formed, stamped and drawn readily. In-process annealing is usually required to reduce hardness and increase ductility. The austenitic class of stainless steels is generally considered to be weldable by the common fusion and resistance techniques. Special consideration is required to compensate for a higher coefficient of thermal expansion to avoid warping and distortion. 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.

HEAT TREATING - Forging, Normalizing, and Annealing:

309 is not hardenable by heat treatment.

Annealing: Anneal at 1900 - 2050°F (1038 - 1121°C), then water quench or rapidly air cool.



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