Our 309 welded stainless steel round tube is a high-temperature alloy designed for use in environments with extreme heat. These tubes are primarily used for furnace parts, heat exchangers, and exhaust systems in the aerospace and energy sectors. The 309 alloy offers superior oxidation resistance compared to 304 or 316 stainless when exposed to temperatures up to 1900 degrees Fahrenheit. Its high nickel and chromium content ensure it maintains structural integrity under intense thermal stress. Purchase your 309 stainless tubing from Onlinemetals.com for your most demanding high-heat engineering projects.