Piston ring excellent in resistance to scuffing, cracking and fatigue and method for producing the same, and combination of piston ring and cylinder block
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United States of America Patent
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Issued Date -
Mar 4, 2004
app pub date -
Jun 17, 2003
filing date -
Jul 17, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A piston ring having improved scuffing resistance, cracking resistance and fatigue resistance, consists of a high-chromium martensitic stainless steel and a sliding nitriding layer formed on the surface of said steel. The stainless steel consists of C: 0.3 to 1.0%; Cr: 14.0 to 21.0%, N: 0.05 to 0.50%, at least one of Mo, V, W and Nb: 0.03 to 3.0% in total, Si: 0.1 to 1.0%, Mn 0.1 to 1.0%, P: 0.05% or less, S: 0.05% or less, the balance being Fe and unavoidable impurities. The sliding nitriding layer comprises on its surface hard particles mainly consisting of nitrides in a range of from 0.2 to 2.0 .mu.m of average particle size, 7 .mu.m or less of the longest diameter, and from 5 to 30% in area ratio.
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