Stainless steel, commonly abbreviated as SS, is a corrosion-resistant alloy of iron, carbon, and other elements like chromium, nickel, and molybdenum. The choice of stainless steel for heavy impellers is due to its excellent resistance to corrosion, especially in harsh environments such as those involving water, chemicals, or extreme temperatures. SS impellers are also valued for their high strength and durability, which makes them suitable for handling heavy loads and high-speed applications without compromising performance.