Effects of wire drawing reduction rate of cross-sectional area on spheroidizing annealing structure and mechanical property of φ9.67- 11.69mm 10B30 steel wire rod(/%:0.28-0.34C

0.0005-0.0030B) have been studied. The results show that with increasing of drawing reduction of cross-sectional area

the rate of spheroidizing annealing structure increases

the tensile strength decreases and the reduction of area increases

this is because the wire drawing promotes spontaneous spheroidizing and ostwald ripening of carbide during spheroidizing annealing. Spheroidizing annealing structure and corresponding tensile strength and reduction rate of cross-sectional area become stable when drawing reduction rate of cross- sectional area is over 25%. In actual production

drawing reduction of cross-sectional area before annealing shouldn't be less than 25%.