Alloy 309/309S (UNS S30900/S30908) austenitic stainless steel

Alloy 309/309S (UNS S30900/S30908) austenitic stainless steel is typically used for elevated temperature applications. Its high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common austenitic Alloy 304.

309/309S stainless steel Applications:
Oven linings, boiler baffles, fire box sheets, furnace components and other high temperature containers.

Hot Working
Grade 309 stainless steel is hot worked at 1177°C (2150°F) followed by reheating at 982°C (1800°F). It can be then quenched rapidly. Post-work annealing can be done to restore its corrosion resistance property.

Cold Working
Grade 309 stainless steel can be headed, upset, drawn, and stamped even though it has high work hardening rate. Annealing is performed after cold working in order to reduce internal stress.

309/309S stainless steel Physical Properties
Density
0.285 lbs/in3
7.89 g/cm3

Specific Heat
0.12 BTU/lb-°F (32 – 212°F)
502 J/kg-°K (0 – 100°C)

Modulus of Elasticity
28.5 x 106 psi
196 GPa

Thermal Conductivity 212°F (100°C)
9.0 BTU/hr/ft2/ft/°F
15.6 W/m-°K

Melting Range
2500 – 2590°F
1480 – 1530°C

Electrical Resistivity
30.7 Microhm-in at 68°C
78 Microhm-cm at 20°C

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