This technical report from the Bureau of Standards provides in-depth information on heat treatments and other properties of iron and steel. Drawing on years of research and experimentation, Rosenberg and Digges lay out the most up-to-date knowledge and techniques for working with these metals. An indispensable resource for metallurgists and other engineers. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.