309S Stainless Steel Bar is a high-chromium-nickel austenitic solid bar, famed for exceptional high-temperature oxidation and heat resistance with a service temperature up to 1000℃. It retains stable mechanical properties under medium-high heat conditions, has moderate general corrosion resistance in normal environments, and features good weldability, formability and machinability. Available in round, square, hexagonal and flat profiles with customizable dimensions, lengths and surface finishes, it boasts high dimensional precision, serving as a premium cost-effective choice for medium-high temperature industrial machining applications.