Based on devoiced eutectoid transformation ( DET) principle
the fast spheroidizing annealing process for 4 mm plate of alloy tool steel SKS51 (/% : 0.75 ~0. 85C
0.20 ~ 0. 50Cr- 1.30 ~2
OONi) produced by CSP line has been tested and studied in laboratory. Results show that with austenizing at 730℃ for lOmin then cooling in furnace to 650 ℃ isothermal-spheroidizing for 120min
the steel gets better sphroidal structure with more uniform-distributing residual carbide particles. As compared with traditional spheroidizing annealing process the fast spheroidizing annealing process can save energy and reduce consumption and increase productivity.