The studied steelmaking flow sheet for tyre cord steel is 150 t LD-RH-LF-soft argon blowing-CC process. The plasticity of non-metallic inclusions in steel is controlled by adding deoxidation reagent Si-Mn during LD tapping and adding low basicity top slag during LF refining to carry out steel-slag reaction. Results show that in RH
LF
tundish-bloom procedure
the main inclusions in steel are respectively MnO-Al
2
0
3
-SiO
2
( RH)
CaO-Al
2
O
3
-SiO
2
(LF) and MnO-Al
2
O
3
- SiO
2
(tundish and bloom)
It is available to control the quantity and size of inclusions in steel and the Al
2
0
3
content in inclusions and to form plastic inclusions by using Si-Mn deoxidation and usi