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采用夹杂物原貌分析、扫描电镜和能谱分析、氧氮分析等手段系统分析了IF钢铸坯全厚度方向的洁净度变化及夹杂物分布规律.铸坯厚度方向全氧(T.O)和N质量分数平均值均为17×10-6.内、外弧表层1/16内T.O、N均高于平均值5%~10%,存在夹杂物聚集带;内弧1/4至外弧1/4区域T.O、N水平低于平均值5%~10%;表层1/16至1/4区域接近平均水平.共统计夹杂物963个,夹杂物平均粒径5.7μm,<5μm占60%,<10μm占90%;Al2O3夹杂主要存在表层5 mm内,尺寸在2~10μm;Ti N-Al2O3和Ti N粒子主要在距离表层5~80 mm,尺寸随深度增加而增大;Ti N-Ti S和Ti S夹杂主要在距离表面80~130 mm,尺寸1~5μm.从铸坯表层到中心主要夹杂物的分布依次是Al2O3、Al2O3-Ti N、Ti N、Ti N-Ti S、Ti S和MnS.
The change of cleanness and the distribution of inclusions in the full thickness direction of IF steel slab were systematically analyzed by means of the original appearance analysis of inclusions, scanning electron microscopy and energy spectrum analysis, oxygen and nitrogen analysis etc. The total oxygen (TO) and N mass The average value of the scores is 17 × 10-6.The inner and outer arc 1/16 of the TO and N are higher than the average value of 5% to 10%, there are inclusions aggregation zone; inner arc 1/4 to outer arc 1 / 4, the TO and N levels in the area are lower than the average of 5% -10%, and the average area of 1/16 to 1/4 in the surface layer is close to the average level. A total of 963 inclusions are observed, with an average inclusion size of 5.7μm, 60% <10μm accounted for 90%. The inclusions of Al2O3 mainly existed within 5 mm of the surface and the size ranged from 2μm to 10μm. The size of TiN-Al2O3 and TiN increased mainly from 5 to 80 mm from the surface with the increase of depth. TiN-Ti The inclusions of S and Ti S are mainly 80-130 mm from the surface and 1-5 μm in size.The distribution of the main inclusions from the slab surface to the center are Al2O3, Al2O3-TiN, TiN, TiN-TiS, TiS And MnS.