Types 309 Stainless Steel and 309S are austenitic chromium-nickel stainless steels that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. Type 309S Stainless Steel is identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability. They are essentially nonmagnetic as annealed and become lightly magnetic when cold worked.
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309 - 309S STAINLESS STEEL UNS S30900 / UNS S30908 //// 309 / 309s Stainless Steels (UNS designation S30900/S30908) are austenitic, chromium-nickel stainless steels that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. Type 309s is the low carbon version of 309 which minimizes
Technical Data Sheet 309L Welding Rod and Wire Overview 309L is an austenitic stainless steel used to weld base metal of similar composition and 300 Series stainless to carbon or low alloy steels, and also the low carbon grades of stainless. The low carbon reduces carbide precipitation. (Tri-mix gas = 90% He + 7.5% Ar + 2.5% CO 2)
The only significant difference between 309 and 309S is the carbon content, Alloy 309S has a much less carbon composition which minimizes carbide precipitation and improves weldability. SS 309S stainless steel is a highly alloyed austenitic stainless steel utilized for its outstanding oxidation resistance, high-temperature, strength, and creep resistance.
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