309S Stainless Steel Plate is a high-chromium and nickel austenitic stainless steel, renowned for excellent oxidation and heat resistance in medium-high temperature environments, with a service temperature up to 1000℃, far superior to 304. It features good weldability, formability and machinability, stable mechanical properties at high temperatures, and moderate corrosion resistance in normal conditions. Customizable in thickness and surface finishes, it’s a cost-effective premium choice for medium-high temperature industrial applications.