Simulated results of structural change, residual stresses and distortion are presented for carbon steel cylinder in the scanning-type induction hardening process by a CAE system “HEARTS (HEAt tReaTment Simulation system)”. The system HEARTS was developed to simulate heat treatment processes based on “metallo-thermo-mechanics” available for describing the coupling effect between metallurgical change due to phase transformation, temperature and inelastic stress/strain. A steel cylinder is treated as an axisymmetric model with scanning internal heat generation and convection boundary. The results under different scanning velocity as well as the magnitude and pattern of the heat source from induction coil are compared with experimental data of distortions, volume fraction of metallic phases as well as residual stresses.