Kabushiki Kaisha Riken

Tokusen Kogyo Co., Ltd.

Ryouichi Kamon

Yuji Shima

Junya Takahashi

Shima Yuji

Takahashi Junya

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 SUP10 in JIS G 4801, which contains small amounts of alloying elements, 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 &#x3bc;m is dispersed in a tempered martensite matrix, thereby suppressing the movement of dislocation and creep even at 300&#xb0; C., and improving thermal sag resistance.

Compression ring and its production method

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 &#x3bc;m is dispersed in a tempered martensite matrix.

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Ono, Japan

Ryouichi Kamon