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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 formSize range fromSize range to
Alloy 309/309S sheet & plate1.5 mm12.7 mm
Alloy 309/309S round bar12.7 mm152.4 mm

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    Sheet & Plate

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    Round Bar

Chemical Analysis

Max0.08 (309s) 0.20 (309)24150.0450.030.752.0-


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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 Number (309):
UNS S30900
Werkstoff Number (309):
Standards (309):
UNS Number (309S):
UNS S30908
Werkstoff Number (309S):
Standards (309S):
ASTM A240, AMS 5523
Download the Alloy 309/309S Data Sheet Download

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