By analysing the stepped test pieces with optical microscope, the influence of the Technological parameters including rolling temperature and reduction amount on the Austenitic recrystallization fraction of Nb content of 0.08％ steel deformed in high temperature processing was studied, and the deformed austenite recrystallization figures of the test steel were obtained. The result indicates when the reduction amount is 60%, the critical temperature of complete recrystallization is 1070℃ and the borderline temperature of non recrystallization is 900℃. In contrast with general HSLA steel, the recrystallization and non recrystallization temperatures are respectively 120℃ and 100℃ higher so the steel contenting high Nb has better hot processing performance because Nb has great function of holding back recrystallization.
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