The production flowsheet of ø9~ ø12 mm wire rod o£ spring steel 60Si2MnA is 100 t BOF-LF-VD-150 mm x 150 mm billet casting-high speed wire rolling process. The decarburization mechanism is discussed and the effective factors on decarburization are analyzed. With the process measures including suitable decreasing the temperature of second heating zone and rising the temperature of soaking zone

decreasing the total heating time of billet from 2. 7 h to 1. 5 h

controlling oxygen content in furnace being 3% ~ 5%

decreasing beginning rolling temperature and finishing rolling temperature respectively from (1 000 ± 20 )℃ and (850 ± 20 ) ℃to ( 950 ± 20)℃and ( 820 ± 20 )℃ 

reducing the wind cooling time for wire rod at temperature more than 727 X.

the full ferrite decarburization layer of wire rod of spring steel 60Si2MnA decreases from 0. 072 mm to 0

the total decarburizat

ion layer decreases from 0. 142 mm to 0. 063 mm

and the fatigue life of spring increases from 17. 7 x 10

4

to 23. 2 x 10

4

.