Ultra-high-strength spring steel for valve spring

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United States of America Patent

PATENT NO 10689736
APP PUB NO 20170159161A1
SERIAL NO

15139231

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Abstract

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An ultra-high-strength spring steel for an engine valve spring steel comprises, by weight: 0.5-0.7% of carbon (C), 1.3-2.3% of silicon (Si), 0.6-1.2% of manganese (Mn), 0.6-1.2% of chrome (Cr), 0.1-0.5% of molybdenum (Mo), 0.05-0.8% of nickel (Ni), 0.05-0.5% of vanadium (V), 0.05-0.5% of niobium (Nb), 0.05-0.3% of titanium (Ti), 0.001-0.01% of boron (B), 0.01-0.52% of tungsten (W), 0.3% or less (0% exclusive) of copper (Cu), 0.3% or less (0% exclusive) of aluminum (Al), 0.03% or less (0% exclusive) of nitrogen (N), 0.003% or less (0% exclusive) of oxygen (O), and a remainder of Fe and other inevitable impurities, based on 100% by weight of the ultra-high-strength spring steel.

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Patent Owner(s)

Patent OwnerAddress
HYUNDAI MOTOR COMPANY12 HEOLLEUNG-RO SEOCHO-GU SEOUL 06797
KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY5 HWARANG-RO 14-GIL SEONGBUK-GU SEOUL 02792
HYUNDAI STEEL COMPANY63 JUNGBONG-DAERO DONG-GU INCHEON 22525

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cha, Sung Chul Seoul, KR 28 59
Jo, Bong Lae Yongin-si, KR 10 13
Shim, Jae Hyeok Seoul, KR 7 6
Song, Sang Min Asan-si, KR 20 58

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