The following specifications cover Stainless Steel 309
AISI 309ASTM A167ASTM A249ASTM A276ASTM A473ASTM A479DIN 1.4828UNS S30900
Chemistry Data : [top]
22 – 24
12 – 15
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.
Physical Data : [top]
Density (lb / cu. in.) 0.287
Specific Gravity 7.9
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.12
Electrical Resistivity (microhm-cm (at 68 Deg F)) 468
Melting Point (Deg F) 2650
Modulus of Elasticity Tension 29