Steels represent the most used metallic material, possessing a wide range of structures and properties. By examining the properties of steels in conjunction with structure, this book provides a valuable description of the development and behavior of these materials - the very foundation of their widespread use. The fourth edition of this successful book has been thoroughly updated with expanded and new content, with improved organization, while retaining its clear writing style, extensive bibliographies and real-life examples. Steels: Structure and Properties , Fourth Edition remains an essential text and reference, providing indispensable foundational content for researchers, metallurgists and engineers in industry and academia. The book provides inspiring content for undergraduates and yet has a depth that makes it useful to researchers. Key features: A new chapter on nanostructured steels, with new content integrated into existing chapter to describe the physical metallurgy of coatings and surface treatments, and multivariate high-performance steels Includes derivations with important equations so that students from a broad range of subjects can appreciate the issues without being bogged down in mathematics Replacement of the majority of micrographs and figures reflecting the resolution and capabilities of modern instruments.