309S grade is a fully austenitic stainless steel containing 23% Cr, and 13% Ni additions. The alloy is well
known for its multi - purpose high temperature corrosion resistance behaviour. Carbon additions are optimized in
order to provide improved creep resistance properties. Alloy 309S can be easily welded. With its high
chromium and low nickel contents, the alloy is designed for high temperature applications up to 1000°C (1832°F)
in sulphur containing atmospheres. Higher sulphur content in gases will result in lower maximum temperature of
uses. The alloy can be also used in slightly oxidizing atmospheres, nitriding, cementing conditions as well as with
thermal cyclings, but the maximum temperature of use will be reduced.
