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This paper studies hot rolled Ti + Nb + P-IF steel in austenite region,with cold rolling reduction as the influencing factor.Cold deformation and recrystallization annealing were carried out.And microstructure observation,TEM analysis and texture measurement were used as the measurement methods.Conclusions were drawn on the evolution of recrystallization microstructure 、secondary phase particles 、texture of Ti + Nb + P-IF steel with different cold rolling reduction.