The variation of dissolved oxygen content in molten steel-[O

]

and inclusion ingredient of SWRM6 cold heading steel(≤0.08C

≤0.06Si

≥0.02Al) deoxidized refining by 2.5 kg/t Al block + 2.5 kg/t compound deoxidants or 5.0 kg/t AlMgFe block has been studied by 1kg MoSi

2

furnace. The results showed that at 1873 ℃ with dissolved oxygen content 600×10

-6

~850×10

-6

in steel and deoxidized by Al for 30 min

the[O

]

was 6×10

-6

~17×10

-6

and then feeding compound deoxidants to deoxidize for 30 min

the [O

]

in steel could decreased to 3×10

-6

~ 4×10

-6

by feeding FeSiMgBaCaAl

FeMgCaAl

or FeCa wire

except for heats by feeding FeCaAl for 30 min

of which the [O

]

in steel was 13×10

-6

.Alone deoxidized by 70%～80% Al-10%～15% Mg-Fe

&

alloy for 30 min

the [O

]

in steel decreased to 4×10

-6

.The analysis on typical inclusion in steel showed that the formed larger size inclusions in steel deoxidized by alloy AlMgFe easily went up and were removed from molten steel.