PISTON RING AND ITS PRODUCTION METHOD

摘要

To provide a piston ring of low-alloy steel having excellent nitridability, namely, a piston ring of low-alloy steel having excellent thermal conductivity and capable of being provided with a sufficient nitrided layer, steel comprising by mass 0.45-0.65% of C, 0.15-0.35% of Si, 0.65-1.00% of Mn and 0.60-1.10% of Cr as indispensable alloy elements, and less than 0.35% of Mo, less than 0.25% of V and less than 0.001% of B as optional alloy elements, the total amount of the indispensable alloy elements and the optional alloy elements being less than 3.0% by mass, is formed into a piston ring; and the nitrided layer is formed on its surface.

主权项

1. A piston ring made of steel comprising C, Si, Mn and Cr as indispensable alloy elements, and Mo, V and B as optional alloy elements;
said indispensable alloy elements having a composition comprising by mass 0.45-0.65% of C, 0.15-0.35% of Si, 0.65-1.00% of Mn, and 0.60-1.10% of Cr; said optional alloy elements having a composition comprising by mass less than 0.35% of Mo, less than 0.25% of V, and less than 0.001% of B; the total amount of said indispensable alloy elements and said optional alloy elements being less than 3.0% by mass; and a nitrided layer being formed on the surface.