Test 0. 8 mm cold rolled sheet of 390 MPa IF steel (/%: 0. 005C

0.04Si

0. 35Mn

0. 095P

0. 005S

0. 030Nb

0. 016Ti

0. 036Alt) is cold rolled by 4 mm hot rolled plate. The effect of continuous annealing temperature 780 ~ 820 °C on structure

texture and mechanical properties of the IF steel has been studied. Results show that as continuous annealing temperature increases from 780 ℃ to 820 ℃

the yield and tensile strength of the IF steel decrease respectively from 282 MPa and 432 MPa to 249 MPa and 405 MPa

and the elongation A

50

and plastic strain ratio r

m

increase respectively from 37. 2% and 1.45 to 41. 7% and 1. 84

it has better deep drawing property while with increasing annealing temperature the plane an

isotropic index △r   increases from 0. 44 to 0. 65

grain size of ferrite increases， and structure homogeneity becomes poor

and deformation texture {112}

<

110 > is weaker

favorable texture {111}

<

110 > is enhanced

texture {001}

<

110> weakens

comprehensively considering

the suitable annealing temperature is about 820 ℃.