采用Ｘ射线衍射方法测定了具有不同石墨化率的自焙炭块的真密度ρｕ，并结合体积质量ρｂ估算了全气孔率ｑ和比孔体积Ｖ·同时采用ＥＰＭ方法观测了自焙炭块的气孔形态，并与美国ＵＣＡＲＮＭＡ系列炭块进行了比较，认为：国产自焙炭块的气孔形状及力学结构不尽合理；１４５０℃下铁液在该炭块孔隙中的渗透较明显，且随时间的延续，渗透深度增加· The true density ρu of self-baking carbon blocks with different graphitization rates was determined by X-ray diffraction. The total porosity q and the specific pore volume V were estimated by combining the bulk mass ρb. Stomatal shape and compared with the UCAR-NMA series carbon blocks in the United States. It is concluded that the stoma shape and mechanical structure of the self-baking carbon blocks in China are not reasonable. The infiltration of molten iron in the pores of the carbon block is obvious at 1450 ℃ As time goes by, penetration depth increases