The effect of Ca-Si wire and FeS adding sequence on morphology of sulfide and cutting performance of low carbon structural steel (/% ：0.16C

0.65Mn

0.25Si

0.034S

0.025P) is studied by using a 10 kg induction furnace. Based on inclusion modification treatment of nonmetallic inclusions in steel

with using Image Pro Plus analysis software quantitatively to analyze the inclusions indexes

it is obtained that with using the mode of adding Ca-Si wire first

then adding FeS

the average length of inclusions in steel is 12. 3  μm and the amount of string inclusions and amount of granular inclusions in steel are respectively 64/mm

2

and 41/mm

2

while with using the mode of adding FeS first

then adding Ca-Si wire

the average length of inclusions in steel is 9. 9 μm

and the amount of string inclusions and amount of

granular inclusions in steel are respectively 52 /mm

2

and 53 /mm

2

and the cutting performance is better than that with using first adding Ca-Si wire mode. The first adding FeS then adding Ca-Si wire mode is favorable to control the morphology of sulfide in steel.