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薄带钢中夹杂物是影响其表面质量和材料性能的重要因素。采用真空感应熔炼和铜模吸铸的方法制取了Si-Mn脱氧后加Ti脱氧的低碳钢薄带,薄带中全氧含量为79μg/g,凝固冷速范围为240~960 K/s。利用此工艺制备的薄带中大多数夹杂物尺寸小于1μm,最大夹杂直径为8.5μm。其中尺寸在0.2~0.5μm夹杂物的数量密度为825个/mm2,其在截面上的分布规律为:表面数量最多,达1 570个/mm2,中心和1/4处数量接近。尺寸在0.5~5μm夹杂物的数量密度为510个/mm2,各厚度位置分布均匀。尺寸大于5μm夹杂物的数量密度为15个/mm2,各厚度位置分布均匀。对夹杂物的成分、形貌和结构分析显示,每个夹杂均由多个晶体组成,整体形貌近似球形,为TinO2n-1+Mn S复合夹杂,其中以钛氧化物为主体,Mn S附着在钛氧化物的表面区域。
Inclusion in thin strip is an important factor affecting the surface quality and material properties. The low carbon steel strip with Si-Mn deoxidation and Ti deoxidation was prepared by vacuum induction melting and copper mold suction casting. The content of total oxygen in the strip was 79μg / g, the solidification cooling rate was in the range of 240-960 K / s. The size of most inclusions in the strip prepared by this process is less than 1μm and the maximum inclusion diameter is 8.5μm. The number of inclusions with the size of 0.2 ~ 0.5μm is 825 per mm2. The distribution of the inclusions in the cross section is as follows: the surface number is the most, reaching 1 570 / mm2, and the number of inclusions is close to the center. The number of inclusions with the size of 0.5 ~ 5μm is 510 / mm2, and the thickness distributions are uniform. The number of inclusions with a size larger than 5μm is 15 / mm2, and the thickness distributions are uniform. The composition, morphology and structure of the inclusions show that each inclusions are composed of multiple crystals, the overall morphology is approximately spherical, which is composed of a combination of TinO2n-1 + Mn S, with the main body of titanium oxide and MnS attached In the titanium oxide surface area.