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309 Stainless Steel Bar

UNS S30900 (Grade 309)

309 stainless steel bar, also known as UNS S30900 and Grade 309, is an austenitic stainless steel comprised of 22% to 24% chromium, 12% to 15% nickel, .2% carbon, 2% maximum manganese, traces of phosphorus, silicon, and sulfur with the balance being iron. Grade 309 machines similarly to 304 but has superior strength and corrosion resistance. This alloy is known for good strength and oxidation resistance in continuous service temperatures up to 2000° F. Cold working this material will cause an increase in both hardness and strength, it does not respond to heat treatment.

Industries that use 309 include:

  • Heat Treating

Products partially or completely constructed of 309 include:

  • Baskets and trays
  • Boiler baffles
  • Burner parts
  • Fans
  • Fire box sheets
  • Furnace components
  • Furnace parts, such as conveyor belts and rollers
  • Oven linings
  • Retorts
  • Refractory supports
Stocking Diameters ½” to 6”
Material Lengths Up to 12’
Bar Specifications
Uns Type Ams Astm Federal Characteristics
S30900 309 - A-276
A-314		 QQ-S-763 309 has high strength and resistance to scaling at high temperatures.
Chemistry Analysis
C MN P S SI CR NI MO CU OTHER M/NM
.08 2. .04 .03 1. 22. - 24. 12. - 15. .75 .5   NM

The information above is not warranted, guaranteed, or for design purposes.

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