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通过运用氧氮分析仪、大样电解分析、扫描电镜及能谱分析等分析手段,研究高强钢尾坯不同浇铸长度洁净度。结果表明:尾坯不同浇铸长度的w(T[O])、w([N])和大型夹杂物数量是沿拉坯方向呈逐渐减小的;大型夹杂物主要为:SiO2夹杂物、含K的SiO2-Al2O3夹杂物、含Na的SiO2-Al2O3-CaO夹杂物,以及数量较少的TiN-SiO2夹杂物、MgO-CaO夹杂物和SiO2-CaO夹杂物;距尾端1.5m时,尾坯的洁净度达到正常水平,建议尾坯切割长度大于等于1.5m。
Through the use of oxygen and nitrogen analyzer, large sample electrolysis, scanning electron microscopy and energy spectrum analysis and other analytical tools to study the high strength steel tailings of different casting length and cleanliness. The results show that the w (T [O]), w ([N]) and the number of large inclusions in different casting lengths decrease gradually along the direction of blank drawing. The major inclusions are mainly inclusions of SiO2, K SiO2-Al2O3 inclusions, Na-containing SiO2-Al2O3-CaO inclusions, and a small number of TiN-SiO2 inclusions, MgO-CaO inclusions and SiO2-CaO inclusions; Billet cleanliness reached the normal level, the proposed tail billet cutting length greater than or equal to 1.5m.