Abstract: The reason of oxide scale of continuous casting slab in 22SiMn2TiB steel cannot be completely removed was analyzed by SEM, EDX and XRD. The results show that silicon element (0.70% 〜1. 00 %) of 22SiMn2TiB steel is easy oxidation ,and form the phase of Fe₂SiO₄ (fayalite ) under the condition of primary heating process. The form of Fe₂SiO₄ (fayalite) will be changed after high-pressure water descaling, like anchor, FeO will be packed by it, leading to the increment of adhesion force between inner layer oxide scale and steel matrix, which is the reason for the incompletely removed of oxide scale of continuous casting slab. According to the analysis results, we have optimized heating process of continuous casting slab, the temperature of continuous casting slab was elevated 1 250 ~ 1 300℃, thus, the temperature of continuous casting slab was controlled above 1 173 ℃ after high-pressure water descaling, leading to the decrease of adhesion force between inner layer oxide scale and steel matrix, the question of incompletely descaling of continuous casting slab in steel 22SiMn2TiB will be effectively resolved.

摘要： 采用扫描电镜、EDX能谱仪和X射线衍射仪对22SiMn2TiB钢连铸坯的氧化铁皮除不净的原因进行分析。结果表明,在现行加热工艺条件下容易使钢中Si（0.70%～1.00%）氧化,并在连铸坯氧化铁皮中形成Fe₂SiO₄（铁橄榄石）,经高压水除鳞冷却后Fe₂SiO₄形成类似锚状形貌,将FeO层钉扎住,增加了与基体的附着力,致使氧化铁皮很难完全被除掉。通过优化加热工艺,控制连铸坯加热出炉温度为1 250～1 300℃,可使连铸坯经除鳞点后温度控制在1 173℃以上,减小氧化铁皮与基体的结合力,可有效的解决22SiMn2TiB钢连铸坯除鳞不净的问题。