Spring steel wire excellent in fatigue characteristic and wire drawability

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United States of America Patent

PATENT NO 8192562
APP PUB NO 20100034691A1
SERIAL NO

12444001

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Abstract

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An object of the preset invention is to provide a spring steel wire that: shows excellent wire drawability not only when it is used as a spring steel wire for cold-winding formed into a steel spring by applying quenching and tempering treatment after wiredrawing but also when it is used as a spring steel wire for cold-winding formed into a steel spring as it is wiredrawn; and secures a spring having an excellent fatigue characteristic after the spring steel wire is formed into the spring. The spring steel wire according to the present invention is a spring steel wire excellent in fatigue characteristic and wire drawability, wherein: the contents of C, Si, Mn, Cr, Ti, B, and other elements are specified; the contents (mass %) of B, Ti, and N satisfy the expression (1) below; the amount of solid solute B is in the range of 0.0005% to 0.0040%; the remainder in the spring steel wire is composed of Fe and unavoidable impurities; and the solid solute B concentrates at the grain boundaries of pearlite nodules,

description='In-line Formulae' end='lead'0.03≦B/(Ti/3.43−N)≦5.0  (1).description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD )2-4 WAKINOHAMA-KAIGANDORI 2-CHOME CHUO-KU KOBE-SHI HYOGO 651-8585

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yoshihara, Nao Kobe, JP 26 129

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