Cylinder sleeve for casting

The utility model aims to provide a cylinder sleeve for casting, which can improve the bonding strength between the cylinder sleeve and a cylinder block by reducing the gap between the cylinder sleeve and the cylinder block. The above-mentioned problem can be solved by setting a molten metal travel index (YI), which is defined by formula (1), to 2.2-14.5 (inclusive). (1) Molten metal travel index YI = [area ratio St (%) of the protruding tops * molten metal penetration volume V (mm3)/surface area A (mm2) of the cylinder liner base body]/average inter-surface distance Pav (mm) of the protruding tops. 本实用新型的课题在于提供一种铸造用气缸套筒，能够通过减少气缸套筒与气缸块之间产生的空隙，提高气缸套筒与气缸块之间的结合强度。通过将由下式(1)所定义的熔融金属行进指数YI设定为2.2以上14.5以下能够解决上述课题。熔融金属行进指数YI＝[突起顶部的面积比率St(％)×熔融金属渗透容积V(mm3)/气缸套筒基体的表面积A(mm2)]/突起顶部的平均表面间距离Pav(mm)...(1)。