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Description:Alloy 309 is typically used for elevated temperature applications. Their high chromium and nickel contents provide comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common austenitic alloy 304.

Applications:
Higher alloyed stainless steels generally exhibit excellent elevated temperature strength along with resistance to creep deformation and environmental attack. As such, they are used widely in the heat treatment industry for furnace parts, fans, tube hangers, and baskets and trays to hold small parts. These grades are also used in the chemical process industry to contain hot concentrated acids, ammonia, and sulfur dioxide. In the food processing industry, they are used in contact with hot acetic and citric acid.

Chemical Composition:

C	Mn	P	S	Si	Cr	Ni	Fe
0.20	2.00	0.045	0.030	0.75	22 ~ 24	12 ~ 15	Balance

Physical Properties:
Density: 8.03 g/cm3

Aqueous Corrosion Resistance:
Alloy 309 is primarily used at elevated temperature to take advantage of their oxidation resistance. However, 309 is resistant to aqueous corrosion due to their high chromium and nickel contents.
Very resistant to oxidation.