This is a fundamental textbook on the theory and practice of open-hearth steelmaking intended for students of metallurgical and mechanical engineering faculties specializing in the field of steel manufacture. The authors compiled and presented a vast material on the subject, including the theoretical fundamentals and practice of acid and basic open-hearth steelmaking, dephosphorization, desulphurization, deoxidation, alloying, manufacture of high-quality and special steels, combined processed of steelmaking, teeming practice, and continuous casting of steel.