Compression ring and its production method
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United States of America Patent
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Mar 21, 2017
Grant Date -
May 1, 2014
app pub date -
Jun 21, 2012
filing date -
Jun 22, 2011
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Abstract
To provide a price-competitive compression ring having excellent thermal conductivity and thermal sag resistance, which can be used in a high-thermal-load environment of high-compression-ratio engines, steel identified by the material number of SKS93 in JIS G 4404 is used, and a piston ring wire is annealed before an oil-tempering treatment such that spheroidal cementite having an average particle size of 0.1-1.5 μm is dispersed in a tempered martensite matrix.
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