钢初期凝固坯壳的自由变形

FREE DEFORMATION OF INITIAL SOLIDIFIED LAYER OF STEEL

坯壳初期凝固变形直接影响连铸坯表面质量．采用液滴落下法研究了钢中碳（Ｃ）和其它合金元素含量对坯壳凝固自由变形的影响．结果表明：浇铸温度越高，钢试样铸片越接近球冠状原因是坯壳底面随着表面张力和元素含量的变化而发生了再弯曲和再熔化． Ｃ是坯壳初期凝固变形的主要影响元素， Ｓ， Ｍｎ； Ｐ和

The deformation of initial solidified layer directly affects the surface quality of continuous casting steel. Experiments are conducted to study the effects of the carbon and other alloy element contents on the free deformation of solidified shell by the drop-let method. Results show that the higher the casting temperature is, the more spherical the casting steel sample looks. This is due to the rebend and redissolvation of the bottom shell with the changes of the surface tension and element contents. The effects of silicon, manganese, phosphorus and sulfur contents are relatively much less compared with the effect of carbon content on the deformation of initial solidified layer. Thus carbon is the main element that influences the initial solidified layer.