Abstract: The static recrystallization behavior of a high temperature processing (HTP) steel containing 0.08% Nb (4^#Nb steel) with coarse austenite was investigated by using a thermo-mechanical simulator Gleeble 1500. A low carbon steel containing 0. 049% Nb (2^# Nb steel) was also studied as a comparison. The results indicate that the static recrystallization kinetics process of 4^# Nb steel is slightly slower than that of 2^# Nb steel at high deformation temperature. The recrystallization of 4^# Nb steel is greatly retarded with decreasing deformation temperature. According to experimental data, a mathematical model of static recrystaUization was developed, which can provide theoretical guidance for designing the industrial rolling procedure.