使用ASPEX PSEM explorer研究了帘线钢中氧化物夹杂的成分及形态在炼钢与轧制过程的变化。结果表明，连铸坯夹杂物中SiO2质量分数较中间包有增加趋势，并在铸坯中发现MnO-SiO2-Al2O3和SiO2构成的复合夹杂物，轧制盘条中出现未很好变形的SiO2夹杂物。热力学分析表明：由于连铸过程钢液和夹杂物间的传质作用，导致铸坯夹杂物中SiO2质量分数增加，MnO-SiO2-Al2O3系夹杂在浇铸过程较CaO-SiO2-MnO-Al2O3系夹杂物更易析出SiO2相，形成MnO-SiO2-Al2O3为基体的复合夹杂物。CaO-SiO2-Al2O3-MnO和MnO-SiO2-Al2O3夹杂物在盘条中呈长条状，MnO-SiO2-Al2O3和SiO2析出相构成的复合夹杂在轧制过程将发生相分离，形成“眼睛状”或单颗粒状夹杂。
Changes in composition and morphology of inclusions during steelmaking and rolling process of tire cord were studied by ASPEX PSEM explorer. The results showed the content of SiO2 in inclusions in as-cast bloom increased a little compared to that in the tundish and dual-phase structure of pure SiO2 in MnO-SiO2-Al2O3 matrix were also ob-served in as-cast bloom. Inadequate deformation SiO2-type inclusions were observed in rolling products. Thermodynam-ic analysis showed that mass transfer between liquid steel and inclusions resulted in the rise of SiO2 content in inclusions from tundish to as-cast bloom and accelerated the precipitation of pure SiO2 phase in the formed inclusions. SiO2 solid phase was highly likely to precipitate out from MnO-SiO2-Al2O3 inclusions to form dual phase inclusions,compared to precipitate from CaO-SiO2-MnO-Al2O3 inclusions. During hot rolling,the homogeneous CaO-SiO2-Al2O3-MnO and MnO-SiO2-Al2O3 can easily be elongated and presented long strip shape in rolled products. Phase separation in the dual phase inclusion of MnO-SiO2-Al2O3 and SiO2 may occur for its inhomogeneous composition during rolling accounting for the distribution of non-deformable SiO2 inclusions in the wire rods and some eye-shaped and single-particle inclusions were generated.
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