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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 GET A QUOTE
Alloy 309/309S round bar12.7 mm152.4 mm GET A QUOTE

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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, here are just a few examples:

  • 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
W.Nr.Number (309):
Standards (309):
UNS Number (309S):
UNS S30908
W.Nr.Number (309S):
Standards (309S):
ASTM A240, AMS 5523
Download the Alloy 309/309S Data Sheet Download

FAQs & Resources

602 CA® is our strongest and most oxidation resistant alloy readily available for service above 1040°C. 602 CA® has been oxidation tested to 1230°C. General service experience shows the alloy working well above 1150°C. However, one cannot successfully choose an ally based on temperature limitation alone. Other factors such as atmosphere/media/environment, mechanical requirements and usage should also be considered when choosing the right alloy for an application.

Alloy 321, 316Ti, 309, 310S, 800 H/AT, 253 MA®, RA330 ®, RA333®, 600, 601, 602 CA® are generally referred to as heat resisting alloys and used in various high temperature applications.

NeoNickel aims to provide a quote or contact our customer back within 24 hours after we received an enquiry.

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Fill in our online form to get a fast quote. Got a technical question? Contact us on techsales@neonickel.com or for more general enquiries please email us at enquiries@neonickel.com