Material：309 309S SUS309S 0Cr23Ni13

309 Stainless steel Seamless pipes

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.

309S Stainless steel Seamless tubes

Principal Design Features  Basically a controlled carbon version of type 309 stainless designed to improve the weld strength of the alloy while benefiting from the alloy’s high resistance to heat and corrosion. Superior corrosion resistance to 309 in the range of 800-1500 F (427-816 C).�

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 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.