Steels represent the most widely-used metallic alloy, possessing a wide range of microstructures and mechanical properties. By examining the mechanical properties of steels in conjunction with microstructure this book provides a valuable description of the development and behavior of these materials, the very foundation of their widespread use. Updated throughout and including new chapters on nanostructured steels, and new alloys and technologies for the energy and automobile industries, the book is clearly written and illustrated, with extensive bibliographies and real-life examples. This is an essential reference, both compact and readily comprehensive, for metallurgists and engineers, as well as senior undergraduate students and postgraduates in materials science, physical metallurgy and mechanical engineering.