The Handbook summarizes the theoretical foundations of metal science, provides methods for researching and testing metals and assessing their most important technological properties. Sections provide the necessary information about iron-based alloys - steels and cast irons; data on composition, structure and properties of basic non-ferrous metals and alloys based on them; information on steels and alloys with special properties; information on noble metals and alloys. The reference book is necessary when designing, installing, operating machines and mechanisms for various purposes. The guide will be useful for development specialists, researchers, graduate students, students who have faced questions about the use of metal materials in their work.