HIGH-STRENGTH SPRING

WIPO Patent Application WO/2012/017749

A1

A high-strength spring is provided. A spring (2) disclosed in the present invention comprises a steel layer (12) and a nitride-containing compound layer (14) that is formed on the surface of the steel layer (12). The steel layer (12) contains, by mass%, 0.55 to 0.75 of C, 1.50 to 2.50 of Si, 0.30 to 1.00 of Mn, 0.80 to 2.00 of Cr, and 0.05 to 0.30 of W, with the remainder being iron and inevitable impurities. A carbide (16) that precipitates in the steel layer (12) has an average length of 0.12 µm or less and an average width of 0.04 µm or less.

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MIMURA SHINGO (JP)
SAKAKIBARA TAKAYUKI (JP)

PCT/JP2011/064165

February 09, 2012

June 21, 2011

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CHUO HATSUJO KK (JP)
MIMURA SHINGO (JP)
SAKAKIBARA TAKAYUKI (JP)

C22C38/00; C22C38/34; F16F1/02; C21D1/06; C21D7/06; C21D9/02

WO2007114491A1

2007-10-11

JP2007302950A	2007-11-22
JP2008266725A	2008-11-06

KAI-U PATENT LAW FIRM (JP)
Patent business corporation KAI-U Patent Law Firm (JP)

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