Steel for mechanical structure for cold working, and method for manufacturing same

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United States of America Patent

PATENT NO 9914990
SERIAL NO

14387906

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Abstract

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The present invention is a steel for a mechanical structure for cold working, the steel characterized in containing C, Si, Mn, P, S, Al, N, and Cr, the remainder being iron and inevitable impurities; the metal composition having pearlite and pro-eutectoid ferrite; the combined area of the pearlite and pro-eutectoid ferrite being 90% or more of the total composition; the area percentage A of the pro-eutectoid ferrite having the relationship A>Ae, where Ae=(0.8−Ceq)×96.75 (Ceq=[C]+0.1×[Si]+0.06×[Mn]−0.11×[Cr], and “(element names)” indicates the element content (percent in mass); and the mean grain size of the pro-eutectoid ferrite and the ferrite in the pearlite being 15 to 25 μm.

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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
Chiba, Masamichi Kobe, JP 17 12
Tsuchida, Takehiro Kobe, JP 15 50
Yamashita, Koji Kobe, JP 241 1993

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