| 摘要 |
PURPOSE:To improve the durability of a piston ring made of an alloy steel by adding prescribed percentages of C, Si, Cr, Mo, V and W and forming a nitrided layer on the outside. CONSTITUTION:This alloy steel for a piston ring consists of, by weight, 0.3- 0.5% C, 0.8-1.5% Si, 4.5-5.5% Cr, 1-1.5% Mo, 0.3-2.1% V and/or W and the balance Fe and has a nitrided layer on the outside as required. The alloy steel has wear resistance, scuffing resistance and heat resistance, and a piston ring made of the alloy steel has superior durability.
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