Abstract: Through thermodynamic calculations of carbon-oxygen reactions and theoretical analysis of CO production in molten steel, it is concluded that bubbles are not generated by the high oxygen enamel steel itself  during solidification. Therefore，during the continuous casting of high oxygen enamel steel, it is necessary to control the carbon content in the tundish flux and continuous casting mould power. By adopting pilot experiments and continuous casting production methods, it was found that as the active oxygen value in the high oxygen enamel steel increased, the total oxygen content also increased, the number of inclusions increased, and the maximum size of inclusions showed an increasing trend. When the active oxygen value reached 0.028 5%, the maximum size of inclusions exceeded 30 μm. The yield of alloy in the steel ingot decreased with the increased of active oxygen value in the molten steel. When the active oxygen value increased from 0.011 6% to 0.028 5%, the yield of Mn in the steel ingot decreased from 93% to 84.2%, and the yield of Nb in the steel ingot decreased from 76.2% to 68%.The inclusions in the high oxygen enamel steel continuous casting slab were spherical and mainly composed of oxides and manganese sulfide. Manganese oxide was the main component in the oxides, while manganese sulfide was distributed on the surface of the oxides. The above-mentioned inclusions were plastic inclusions that deform synchronously with the steel plate during the rolling process. After hot rolling, cold rolling, and enamel, high-quality continuous casting slab have good product performance.

Key words: high oxygen enamel steel, carbon-oxygen equilibrium, alloy yield, inclusion