Honda Motor Co., Ltd.

Nippon Steel Sumitomo Metal Corporation

Kabushiki Kaisha Riken

Tanaka Seimitsu Kogyo Co., Ltd.

Suzuki Metal Industry Co., Ltd.

Riken Castec Co., Ltd.

Keiichi Maekawa

Atsushi Murakami

Masayuki Hashimura

Takayuki Kisu

Hitoshi Demachi

Takaaki Harasaki

Shoichi Suzuki

Kazuo Nakamura

Motonobu Suehiro

Jun Kawaguchi

High strength steel wire for spring containing, by mass %, C: 0.67% to less than 0.75%, Si: 2.0 to 2.5%, Mn: 0.5 to 1.2%, Cr: 0.8 to 1.3%, V: 0.03 to 0.20%, Mo: 0.05 to 0.25%, W: 0.05 to 0.30%, and N: 0.003 to 0.007%, having a total of contents of Mn and V of 0.70%&#x2266;Mn+V&#x2266;1.27% and a total of contents of Mo and W of 0.13%&#x2266;Mo+W&#x2266;0.35%, limiting P: 0.025% or less, S: 0.025% or less, and Al: 0.003% or less, and having a balance of iron and unavoidable impurities, having a microstructure comprised of, by volume percent, over 6% to 15% of retained austenite and tempered martensite, having a prior-austenite grain size number of 10 or more, having a density of presence of spheroidal carbides with a circle equivalent diameter of 0.2 to 0.5 &#x3bc;m of 0.06 particles/&#x3bc;mor less, having a density of presence of spheroidal carbides with a circle equivalent diameter of over 0.5 &#x3bc;m of 0.01 particles/&#x3bc;mor less, and having a tensile strength of 2100 to 2350 MPa.

High strength steel wire for spring

Abrasion resistance is further enhanced in a sliding member used in an internal combustion engine. With respect to a valve lifterused in an internal combustion engine, hard particles having higher hardness than the valve lifterare dispersed onto the top faceof the valve lifter, and a nitriding treatment is conducted on the top facedispersed with the hard particles.

Sliding member and surface treatment method for the same

It is a technical common knowledge that a chaplet used in casting of a hollow casting is fusion-bonded with the melt and is incorporated into the casting. However, the adhesion between the chaplet and the casting body is not necessarily satisfactory, thereby incurring the strength reduction of a thin-wall hollow casting. A core for a thin-wall hollow casting according to the present invention is provided with a chaplet mounted thereon. The chaplet has arcuate portionwith a gapand a plurality of projectionsfrom an outer peripheral of the arcuate portion and is in contact with an inner wallof a mold. The entire arcuate portion of the chaplet is included in a grooveformed around an outer peripheral portion of the core body. Only the projectionsof the chaplet protrude from the core body, when the chaplet is inserted in the groove.

Core for thin-wall hollow casting and thin-wall hollow casting produced by production method employing it

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Wako, Japan

Keiichi Maekawa