B2O3 was added into tire cord steel during refining in carbon tube furnace.The influence of boron which was added in tire cord steel on the deformability of oxide inclusions was studied by metallographic and scanning electron microscope（SEM） observation.The melting points of boron-bearing compound oxide inclusions were calculated by the software of Factsage.The results showed that the most part of inclusions were boron-bearing compound oxide and their deformation properties were obviously improved by adding B2O3 in steel.As the boron content was increased from 0.0046%to 0.039%,the proportion of long strip type inclusions changed a little and the number of inclusions decreased.The low-melting point areas of MnO-SiO2-Al2O3 and CaO-SiO2-Al2O3 ternary system were increased due to adding B2O3 in steel.Moreover,the areas increased with the increasing of B2O3 content in conclusions.Evident effect on low-melting point inclusion occurred when B2O3 content went up to 5% in CaO-SiO2-Al2O3 inclusions system and to 10%in MnO-SiO2-Al2O3 inclusions system.
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