This book continues to be the only book written specifically on the subject of metallurgy in petroleum drilling and production. The purpose for continuing to update this book is threefold. First, there are many nonmetallurgists in the petroleum industry who are responsible for materials selection and failure analysis, yet no single source is available for reference on the subject. Second, for the practicing metallurgist in the petroleum industry, no reference book contains many of the often-used tables, charts, graphs, etc, that are helpful in day-to-day decision making on materials. Third, the few knowledgeable people in this field continue to dwindle and it is hoped that this book will preserve some of the knowledge that has been gained over 50 years in the petroleum industry as it relates to materials.