AGE-HARDENABLE STEEL

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United States of America Patent

APP PUB NO 20160201175A1
SERIAL NO

14765029

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An age-hardenable steel consists of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: 0.03 to 0.50%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, the balance being Fe and impurities. Within impurities, P £ 0.03%, Ti<0.005%, and N<0.0080%, and [C+0.3Mn+0.25Cr+0.6Mo3 0.68], [C+0.1Si+0.2Mn+0.15Cr+0.35V+0.2Mo £ 0.85], and [−4.5C+Mn+Cr−3.5V−0.8Mo3 0.00]. The hardness before aging is not more than 290 HV, a quantity of hardening by aging being not less than 25 HV, fatigue strength is not less than 350 MPa, and absorbed energy at 20° C. after aging is not less than 16 J.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL & SUMITOMO METAL CORPORATIONTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
HASEGAWA, Tatsuya Tokyo, JP 41 127
HIGASHIDA, Masashi Tokyo, JP 10 20
MAKINO, Taizo Tokyo, JP 15 32
MATSUMOTO, Hitoshi Tokyo, JP 212 4590
NEISHI, Yutaka Tokyo, JP 34 19
YUYA, Masato Tokyo, JP 14 3

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