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Inclusions in steel samples collected 0.5, 2, 5, 10 and 20 min after calcium addition were investigated in Low Carbon Aluminum Killed steel (LCAK steel) with ultra low sulfur content (0.04–0.065% Al, 9 ppm S). It’s found that inclusions change from CaO to CaO–CaS and finally to CaO–Al2O3–CaS with time. Al2O3 in inclusions linearly decreases by increasing T.Ca/T.O of the steel and disappears when T.Ca/T.O exceeds 3. CaS/CaO of the inclusions linearly increases by increasing S/T.O of the steel.

Inclusion Evolution after Calcium Addition in Low Carbon Al-Killed Steel with Ultra Low Sulfur Content