In this informative book, Tubal Cain covers the fundamental principles of steel including its composition, additives, and the effects of different temperatures on its elements. Understanding what changes are taking place in the metal will lead to improved and consistent results in the hardening, tempering, and heat treatment of steel. Flame, salt bath and furnace heating are detailed, with information on accurate measurement or recognition of temperature levels. Includes black and white photos, graphics, tables, and diagrams. This comprehensive manual covers every aspect of steel and the effects of different heat treatments, particularly in respect of tools. With accurate color temperature charts.