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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10597765 B1

PDFFull Text
Date of Patent:
Mar. 24, 2020

Filed:

Nov. 25, 2016

Steel, carburized steel component, and method for manufacturing carburized steel component

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Akira Shiga, Hokkaido, JP;

Manabu Kubota, Nishinomiya, JP;

Hajime Hasegawa, Hokkaido, JP;

Hideo Mizukami, Kashima, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Jessee R Roe

Int. Cl.
CPC ...
C23C 8/32 (2006.01); C21D 8/06 (2006.01); C21D 9/28 (2006.01); C21D 9/32 (2006.01); C21D 1/06 (2006.01); C22C 38/60 (2006.01); C23C 8/02 (2006.01); C23C 8/80 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C23C 8/22 (2006.01);
U.S. Cl.
CPC ...
C23C 8/32 (2013.01); C21D 1/06 (2013.01); C21D 8/06 (2013.01); C21D 9/28 (2013.01); C21D 9/32 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/44 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/60 (2013.01); C23C 8/02 (2013.01); C23C 8/22 (2013.01); C23C 8/80 (2013.01); C21D 2211/005 (2013.01);
Abstract

A steel according to an aspect of the present invention has a chemical composition within a predetermined range, in which a hardenability index Ceq ranges from greater than 7.5 to smaller than 44.0, a metallographic structure includes ferrite ranging from 85 to 100 area %, an average distance between sulfides, which are observed in a cross section parallel to a rolling direction of the steel and have an equivalent circle diameter ranging from 1 μm or greater to smaller than 2 μm, is shorter than 30.0 μm, and a presence density of the sulfides, which are observed in the cross section parallel to the rolling direction of the steel and have an equivalent circle diameter ranging from 1 μm or greater to smaller than 2 μm, is 300 pieces/mmor more.

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