Introduction to the following topics: quantitative metallography; compositional and structural analysis; structure of metals; mechanical properties; grain boundary and vacancies; solid solution and phase diagram; diffusion; plastic deformation and annealing; heat treatment of metals and its application, focusing on steel and its alloys; strengthening mechanism. The contents include Metal Structure and Crystallization、Plastic Deformation、Wear of Metal、Tool Steels、Phase Diagrams、Solidification.