This book summarizes the research results of carbide control in special steel from the authors. It includes the evolution and control of carbide in special steel in the process of electroslag remelting, rolling, and heat treatment, as well as the effect of alloying treatment (rare earth, magnesium, nitrogen, titanium) as heterogeneous nucleating agent on the carbides in special steel. It helps the readers to understand the formation mechanism and control technology of carbide in special steel deeply for improving the quality of special steel further. The book is useful as a reference for researchers, practitioners, teachers, and engineering management team in the fields of metallurgy and materials.