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309 Stainless Steel

Shapes Available

  • Pipe
  • Round Bar
  • Sheet


  • Aerospace
  • Manufacturing

Industry Names

  • 309 Stainless
  • 309


  • Stainless Steel


  • AMS 5523
  • UNS S30908
  • UNS S30909


  • Anchor Bolts
  • Annealing Boxes
  • Glass Forming Equipment
  • Radiant Tubes for Aluminum and Steel Annealing
  • Thermowells Paper Mill Equipment
  • Waste Incinerators


  • Ease of Fabrication
  • Good Sulfidation Resistance
  • Good Weldability
  • Moderate Strength at High Temperature
  • Oxidation Resistant to 1900°F

309 stainless steel is an austenitic stainless steel that machines comparably to 304. However, 309 has superior corrosion resistance and strength. Cold working 309 will increase both strength and hardness and this stainless steel does not respond to heat treating.

309 comes in the following shapes: round bar, sheet and pipe.

Please contact us to request a quote. We specialize in hard to find material.

We work closely with many manufacturers in the aerospace & defense industry. We work with NADCAP approved heat treaters and testing laboratories. We can supply DFARS compliant material.

Metal Properties
Melting Range 2500-2590 °F
.2% Yield Strength 45 ksi
Density 0.285 lb/inch³
Elongation 50 %
Ultimate Tensile Strength 90 ksi
Chemical Composition
C- .08
Cr22.0 24.0
Fe- Bal
Mn- 2.0
Ni12.0 15.0
P- .045
S- .03

DISCLAIMER: The information provided on this Web site, technical or otherwise, is merely for informational purposes, and is not intended to serve as a guide, manual, instructions, or any kind reference for proper safety procedures or material purchasing. Michlin Metals makes no warranty, express or implied, based on the statements on this Web site and, as such, will not be liable for any damages, either direct or indirect, including but not limited to consequential damages, such as damages for loss of profits, that may arise based on reliance on the information provided on this Web site. Some information has been referenced from reliable industry sources. Tradenames listed are the sole property of the tradename owners. Michlin Metals typically provides branded products through its relationships with mills and authorized re-sellers. Equivalent non-branded product is sometimes also available through certified sources of such products. Michlin Metals will never substitute non-branded product when branded product is requested.

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