Chromium containing alloys such as ferritic or austenitic steels and nickel-base alloys generally show good oxidation and corrosion resistance as well as high strength, and have been widely used for components in chemical plant, power plant or aircrafts. However, it seems to be necessary to introduce a new technology for further application of these alloys. Nano-structured materials have recently drawn considerable attention, because these materials sometimes show very high strength without serious loss of ductility compared to the materials with deformed microstructure formed by usual processing, and also have large internal friction. This book discusses the composition, properties, electrodeposition, and the applications of chromium alloys. It also provides information on the production of nano-structured chromium-containing alloys.