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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 11111568 B1

PDFFull Text
Date of Patent:
Sep. 07, 2021

Filed:

Sep. 30, 2016

Steel for cold forging and manufacturing method thereof

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Akira Shiga, Tokyo, JP;

Manabu Kubota, Tokyo, JP;

Hajime Hasegawa, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Brian D Walck

Int. Cl.
CPC ...
C22C 38/44 (2006.01); B22D 27/04 (2006.01); C21D 8/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (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);
U.S. Cl.
CPC ...
C22C 38/44 (2013.01); B22D 27/04 (2013.01); C21D 8/00 (2013.01); C21D 8/005 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (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); C21D 2211/004 (2013.01);
Abstract

A steel for cold forging has a predetermined chemical composition, satisfies d+3σ≤10.0 and SA/SB<0.30, includes 1200/mmor more of sulfides having an equivalent circle diameter of 1.0 to 10.0 μm in a microstructure, and has an average distance between the sulfides of less than 30.0 μm. Here, d is an average value of equivalent circle diameters of sulfides having an equivalent circle diameter of 1.0 μm or more, σ is a standard deviation of the equivalent circle diameters of the sulfides having an equivalent circle diameter of 1.0 μm or more, SA is the number of sulfides having an equivalent circle diameter of 1.0 μm or more and less than 3.0 μm, and SB is the number of the sulfides having an equivalent circle diameter of 1.0 μm or more.

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