In this book, the indicators for determining the internal corrosion rate in hydrocarbon environments are collected and the models for calculating the corrosion rate, methods for evaluating and selecting corrosion-resistant alloys, types of corrosion inhibitors, corrosion monitoring methods, destruction mechanisms in refining industries and methods The design of inspection programs along with existing engineering experiences in the field of material selection and corrosion assessment of oil and gas exploitation and processing units has been comprehensively studied. This book was compiled and compiled in 2016 by the efforts of Materials Engineering and Corrosion Design and Refining Department.