309 Stainless Steel

Technical Data Sheet


Chemical Composition Limits
Weight% C P Si Ni Mn S Cr Fe Mo Cu
Alloy 309 0.08 max 0.040 max 1 max 12-15 2 max 0.030 max 22-24 Bal 0.75 max 0.75 max

Alloy 309 is an austenitic chromium-nickel stainless steel which has excellent heat-resisting properties. Alloy 309 has improved corrosion resistance and better creep strength than alloy 304. Alloy 309 is used in furnace parts, fire box sheets, high temperature containers and weld wire.

Typical Mechanical Properties


Condition Ultimate Tensile Strength (MPa)
Yield Strength 0.2% (MPa) Elongation 2" (%) Reduction of Area (%) Rockwell B Hardness
Alloy 309 round bar 1" annealed 1950°F, water quench 620 276 50 77 83

Alloy 309 is available in Bar (Round), Wire, Rod, Billet, Sheet, Strip, Plate. View Stock Lists for further information, Plate Stock List or contact Sales.

AMS 5523 Sheet / strip / plate
AMS 5574 Seamless tube
AMS 5650 Bar / tube / forgings
AMS QQ-A-793
ASTM A276 / ASME SA276
ASTM A479 / ASME SA479
ASTM A484 / ASME SA484
ASTM A314 / ASME SA314
ASTM A580 / ASME SA580
BS 970; 309S24
WS 1.4828
AFNOR Z15CN24-13
UNS 30900 (309)
UNS 30908 (309S)

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.