Stainless Steel / 309 ANN

Type 309 is a high temperature chromium nickel austenitic stainless steel that is known for good strength and oxidation resistance in continuous service temperatures up to 2000 F (1093 C). It is superior to 304 stainless in both strength and corrosion resistance. Type 309 has good sulfidation resistance but low resistance to carburization and should not be used in highly carburizing atmospheres. This alloy does not respond to heat treatment. Cold work will cause an increase in both hardness and strength. Although this alloy has a high work hardening rate, it can be drawn, headed, upset, and stamped. Full annealing is required after cold work to remove internal stress. Type 309 is non-magnetic in the annealed and cold worked conditions and is as resistant to corrosion as Type 304/304L. This product is often used in oven linings, boiler baffles, fire box sheets, furnace components and other high temperature containers. (UNS: S30900)

Chemical Makeup

Element Min Max
Carbon, C 0.8
Manganese, Mn 2
Silicon, Si 1
Sulfur, S 0.03
Phosphorus, P 0.04
Chromium, Cr 22 24
Nickel, Ni 12 15
Copper, Cu - 0.75
Molybdenum, Mo - 0.75

Common Applications

  • Aerospace Aerospace
  • Industrial Industrial


  • High Strength
  • Oxidation Resistance
  • Good Heat Resistence

We stock 309 ANN to the following specifications:

  • AMS-5650
  • AMS-QQ-S-763
  • ASTM-A-276
  • ASTM-A-479 (309 S ONLY)
  • ASTM-A-484
  • QQS-763

Click on a cross-section to see the sizes we stock:

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