This course provides an in-depth introduction to high-performance stainless steels, focusing on their classification, metallurgy, mechanical and physical properties, corrosion resistance, fabrication, and applications. It explains the behavior of austenitic, ferritic, and duplex stainless steels in aggressive environments and highlights the role of alloying elements such as chromium, nickel, molybdenum, and nitrogen in achieving superior performance compared to conventional stainless steels.