Valve spring

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United States of America Patent

PATENT NO 12006994
APP PUB NO 20240077123A1
SERIAL NO

17754667

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Abstract

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A valve spring includes a nitrided layer, and a core portion that is further inward than the nitrided layer. A chemical composition of the core portion consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Ca: 0.0001 to 0.0050%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, and N: 0.0070% or less, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 per μm2, and in the core portion, a numerical proportion of Ca sulfides with respect to a total number of oxide-based inclusions and sulfide-based inclusions is 0.20% or less.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONTOKYO JAPAN
NHK SPRING CO LTDKANAGAWA KANAGAWA
NIPPON STEEL SG WIRE CO LTD1-9-1 MARUNOUCHI CHIYODA-KU TOKYO 100-0005

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aono, Michimasa Tokyo, JP 7 3
Kondo, Mitsuhiro Yokohama, JP 33 740
Kozawa, Shuji Tokyo, JP 24 115
Neishi, Yutaka Tokyo, JP 56 65
Nishimoto, Shigekazu Yokohama, JP 3 16
Ochi, Tatsuro Tokyo, JP 32 182
Suzuki, Shoichi Tokyo, JP 628 6863
Takahashi, Fumio Yokohama, JP 103 927
Teramoto, Shinya Tokyo, JP 28 24

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