The following specifications cover Stainless Steel 309
AISI 309
ASTM A167
ASTM A249
ASTM A276
ASTM A473 (Forging - Open Die)
ASTM A479
DIN 1.4828
UNS S30900
Chemistry Data :
Carbon
0.2 max
Chromium
22 - 24
Iron
Balance
Manganese
2 max
Nickel
12 - 15
Phosphorus
0.045 max
Silicon
1 max
Sulphur
0.03 max
Principal Design Features
This alloy is known for good strength and oxidation resistance in continuous service temperatures up to 2000 F (1093 C).It is superior to 304 stainless in both strength and corrosion resistance.
Applications
Oven linings, boiler baffles, fire box sheets, furnace components and other high temperature containers.
Machinability
This alloy machines similarly to type 304 stainless. Its chips are stringy and it will work harden rapidly. It is necessary to keep the tool cutting at all times and use chip breakers.
Welding
Most of the austenitic stainless steels can be readily welded using fusion or resistance methods. Oxyacetylene welding is not recommended. Filler metal should be AWS E/ER 309 or 309L.
Hot Working
Working temperatures are 2150 F (1177 C), with reheating necessary at 1800 F (982 C).Rapid quenching is recommended. Full post-work annealing is required to reattain maximum corrosion resistance.
Cold Working
Although this alloy has a high work hardening rate, it can be drawn, headed, upset, and stamped. Full annealing is required after cold work to remove internal stress.
Annealing
1900-2050 F (1038-1121 C), water quench.
Hardening
This alloy does not respond to heat treatment. Cold work will cause an increase in both hardness and strength.
