Stainless 309/ AISI 309Stainless 309 offers a better corrosion resistance than the type 304 because of higher percentages of nickel and chromium. This alloy has been used for furnace parts, high temperature containers, weld wire, and fire box sheets. Available forms are seamless pipe, welded pipe, seamless tube, welded tube, bar, wire, sheet, plate, forgings, pipe fittings and flanges.