The texture evolution from rolling process to annealing process of 440 MPa grade Nb-bearing high strength IF steel (IF-HSS) was studied.Moreover,the texture of different section in thickness direction of steel sheet after annealing was investigated.Macro-texture measurements using XRD shows that hot rolling texture in Nb-bearing IF-HSS includes a weak γ-fiber and α-fiber,of which main texture components are { 001 } 〈 110〉,{ 111 } 〈 110〉 and { 111 } 〈 112〉.It is worthy of note that the γ-fiber skeleton line formed after hot rolling.During cold rolling,the absolute maximum shifts to { 111 }〈112〉 along the γ-fiber and the maximum along the α-fiber shifts to { 112} 〈110〉.During recrystallization annealing process,the weaker α-fiber and stronger γ-fiber cold rolling texture transformed to a very strong γ-fiber annealing texture.After annealing the main components from surface to mid-section along thickness display the same character for both α-fiber and γ-fiber,while textures intensity at 1/4 section is higher than that of surface and mid-section.
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