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Alloy 309/309S

A chromium-nickel stainless grade, Alloy309/309S is suitable for a number of high temperature applications.

Alloy 309/309S is an austenitic heat resisting stainless steel. 23% chromium, approx. 5% more than 304 stainless steel gives Alloy 309/309S an edge over 304 stainless steel when it comes to general corrosion resistance at elevated temperatures.


Product form Size range from Size range to
Alloy 309/309S sheet & plate 1.5 mm 12.7 mm
Alloy 309/309S round bar 12.7 mm 152.4 mm

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    Sheet & Plate

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    Round Bar

Chemical Analysis

% C Cr Ni P S Si Mn Fe
Min - 22 12 - - - - Balance
Max 0.08 (309s) 0.20 (309) 24 15 0.045 0.03 0.75 2.0 -


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Alloy 309/309S can be used in a variety of applications including:

  • Aircraft and jet engine parts
  • Auto exhaust parts
  • Heat exchangers
  • Waste incinerators
  • Glass blowing components
  • Rotary kilns
  • Furnace anchor bolts

About Alloy 309/309S

Alloy 309/309S is an austenitic chromium-nickel heat resistant stainless steel with good oxidation resistance up to 1038°C.

The alloy has moderate strength and demonstrates useful performance in reducing sulphidising atmosphere .


7.89 g/cm³


UNS No. (309):
UNS S30900
W. No. (309):
Standards (309):
UNS S30908
W. No. (309S):
Standards (309S):
ASTM A240, AMS 5523
Download the Alloy 309/309S Data Sheet Download

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