This manual compiles practical knowledge on steel manufacturing and use, surveying production methods (cemented or blister, crucible, Bessemer, and open-hearth), properties and effects of carbon and alloying elements, heat treatments including heating, annealing, hardening, and tempering, and the effects of forging, rolling, grinding, and welding. It discusses common impurities and defects, theories of hardening and microstructure, inspection and specification practices, and practical advice for users and temperers, and concludes with a glossary of shop terms to assist practitioners.