In this paper, the effect of the chemical composition, the dimension of casting, the method of the finishing and annealing or not annealing on the distribution of the pressure of a cast iron piston ring on the containing cylinder has been d'scussed. The chemical compositions and the dimensions of casting are shown in Table 1. and Fig. 1.
From this cylindrical c. sting with oval crass-section, several closed rings were taken and also from the remainder with annealed at suitable temperature. These closed rings were all cut off at the portion of cord in Fig. 1 as proper length and stapped with pin and then finished (Fig. 2). The contact pressure was measured by the Riken's testing apparatus and further we performed tension, compression, bending, hardness and abrasion test From these results, we can conclude that the distribution of the contact pressure exerted by these piston ring is better than that of some another cases and it's mean intensity is in all cases nearly propotional to mechanical properties.

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