The genesis of this book comes from the author's work in editing a technical journal on steel and engineering. He observed two significant facts: 1. Steel experts and metallurgists generally are convinced that what they know is common knowledge to everyone (not true); and 2. The people who buy, sell, study, manipulate, and in short have to do with steel thirst for an insight into steel and its structure because they need this insight in their jobs and do not find it easy to come by (true). This book is designed to address both of these issues.