The effect of magnesium on modification of non-metallic inclusions in steel SPHC (0. 065% C
0. 025 % Al) is analyzed by thermodynamic calculation
and combined with commercial test by using an 80 t top and bottom combined blown converter flow sheet
the mechanism for influence of magnesium on inclusions in steel SPHC is studied. Thermodynamic calculation results prove that as[Al
]
2
/a
[Mg]
3
≤7. 69 x 10
10
the inclusion MgO • Al
2
O
3
alone forms in steel ; Commercial test with feeding 0. 875 kg/t magnesium wire in steel SPHC shows that the inclusions are tine by magnesium treatment i. e. the round cluster Al