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Non-metallic inclusions in high-strength low-alloyed steel refined by slag with basicity ( B ) 2–5 and Al 2 O 3  content 20%–30% (in mass percent) were investigated by slag–metal equilibrium experiments in laboratory and thermodynamic calculations. Most inclusions in equilibrium were quasi-spherical CaO-MgO-Al 2 O 3 -SiO 2  system and the sizes were less than 5 µm. The average content ratio, CaO/Al 2 O 3  and CaO/SiO 2  of the inclusions, increased with slag basicity increasing when Al 2 O 3  content in slag was around 25%, MgO/Al 2 O 3  and CaO/Al 2 O 3  increased with Al 2 O 3  content in slag decreasing when slag basicity was around 3.3. The MgO/Al 2 O 3  of the inclusions was influenced mainly by Al 2 O 3  content in slag and CaO/Al 2 O 3  was influenced mainly by slag basicity. To make the inclusions out of relative lower melting region (&lt;1,773 K), the values of CaO/Al 2 O 3 , MgO/Al 2 O 3  and (CaO+MgO)/Al 2 O 3  of the inclusions should be enhanced by increasing basicity and decreasing Al 2 O 3  content in slag properly.

Laboratory Study on Oxide Inclusions in High-Strength Low-Alloyed Steel Refined by Slag with Basicity 2–5