Guest 5639-82 . Methods of identifying and determining the value of grain”, created by the team of authors, is an indispensable guide for specialists, scientists and engineers working in the field of metallurgy, materials science and quality control of metals . This book is a real guide to the complex and important topic of determining the structural characteristics of steels and alloys, revealing all the subtleties and nuances of methods for identifying and measuring grain size, which is a key aspect in assessing the properties and quality of metal materials. The main value of the book is a systematic presentation of standard methods enshrined in the state standard GOST 5639-82, as well as detailed descriptions of procedures that allow you to accurately and objectively determine the size of the grain. It examines in detail various methods of research, ranging from traditional optical methods and microscopy to modern methods of automated analysis, which makes the book relevant for specialists striving for accuracy and modernity in their work. The reader will find here not only theoretical foundations, but also practical recommendations, which is especially important for those who are engaged in product quality control, the development of new alloys or the study of the structural features of metals. The book "GOST 5639-82 STEELS AND SLEEPS" is perfect for metallurgical engineers, technologists, researchers, students of specialized universities and all those who are engaged in the study and control of metal materials . Its content is designed for a wide age range - from students just starting out in metallurgy, to experienced professionals looking for relevant methods and standards. This book is especially valuable for those who appreciate accuracy, consistency and scientific approach in their professional activities. The topics raised in the book cover a wide range of issues related to the structure of metals, the impact of grain size on mechanical properties, methods for determining and standardizing measurements. Particular attention is paid to standardization issues, which makes the book an important tool for compliance with regulatory requirements and improving the quality of products. In today's world, where material requirements are becoming more stringent, this book helps to understand how to properly apply standards and methods to achieve the best results. The style of the authors is distinguished by clarity, accuracy and practical orientation. It combines scientific rigor with the availability of material, which makes reading not only useful, but also fascinating. A team of authors with extensive experience in the field of metallurgy uses a clear structure, illustrations and examples to simplify the perception of complex technical aspects as much as possible. This book is a continuation of the traditions of classical standards, supplemented by modern methods of analysis, which makes it relevant and in demand even decades after publication. If you are looking for a reliable source of knowledge about the methods of determining the size of grain of steels and alloys, then GOST 5639-82 STEELS AND COMMUNICATIONS will become your indispensable assistant. It should be at hand as a practical guide, allowing not only to understand the standards, but also to successfully apply them in their professional activities. This book is the key to accuracy, reliability and high standards in the field of metallurgy and materials science, which will definitely deserve a place on the shelf of every specialist who appreciates quality and professionalism.