| 摘要 |
The piston ring material essentially consists, by weight of 0.2 to 1.2% C, 5.0 to 25.0% Cr and the balance Fe and incidental impurities, M 7 C 3 type carbide content existing in the structure being 4.0% or less in terms of area percent to attain excellent scuffing resistance and workability. Preferably, C is 0.2 to 0.7%, and Cr is less than 12.0%. Cr (wt.%)/c (wt.%) is 12 to 45, preferably 15 to 45, more preferably 18 to 30. In addition, the piston ring material of the present invention may contain not more than 0.25% Si, not more than 0.30% Mn, at least one not more than 2.5% in total selected from the group consisting of Mo, W, V and Nb, not more than 4.0% Cu, not more than 2.0% Ni, not more than 1.5% Al.
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