The ingredients of D type and B type inclusions in high cleanliness bearing steel CCr15 produced by hot metal + scrap- 100t EAF-LF(VD)-CC flow sheet were analyzed and the effect of refining slag ingredient and VD argon stiring process on brittle inclusions in steel were tested. Results showed that in CCr15 steel produced at Xingcheng Special Steel

the ingredients of large scale D type inclusions were O-Al-Ca-S

O-Al-Mg-Ca-(S)and Ti-N-Cr and the ingredients of B type inclusions were O-Al-Ca and O-Al-Mg-Ca; it was available to control large scale inclusions in steel to meet the technical requirement for high cleanliness of steel by using 40~60CaO

20～40Al

2

O

3

5～12MgO

4～10SiO

2

refining slag series

prolonging VD argon stiring time

controlling refractory quality and total oxygen content in steel≤8×10

-6

.