The problem of a detailed research of radial forging is associated with the technological process of direct combination of continuous casting and metal forming. The mathematical model of multi-die radial forging is developed. The strain state of radial forging is investigated. The dependences of main characteristics on technological parameters for radial forging with combined loading (torsion, tension or backing) are received by the variational method. The thermal analysis of hollow continuously cast ingot during deformation is executed. The verification of mathematical model adequacy is executed by experimental researches. The design of six-dies forging unit for direct combination with vertical continuouscasting machine is developed.