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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 11827963 B1

PDFFull Text
Date of Patent:
Nov. 28, 2023

Filed:

Oct. 29, 2019

Roughly-shaped steel material for nitrided part, and nitrided part

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Masato Yuya, Tokyo, JP;

Hiroaki Tahira, Tokyo, JP;

Kison Nishihara, Tokyo, JP;

Satoru Okawa, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

SOLARIS Intellectual Property Group, PLLC

Primary Examiner:

Jenny R Wu

Int. Cl.
CPC ...
C22C 38/40 (2006.01); C21D 1/06 (2006.01); C21D 6/00 (2006.01); C21D 9/30 (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); C23C 8/26 (2006.01);
U.S. Cl.
CPC ...
C22C 38/40 (2013.01); C21D 1/06 (2013.01); C21D 6/002 (2013.01); C21D 6/008 (2013.01); C21D 9/30 (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 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C23C 8/26 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided are a roughly-shaped steel material for a nitrided part, and a nitrided part obtained by nitriding the roughly-shaped steel material for a nitrided part, having a determined chemical composition, in which the portion with a diameter or width ranging from 60 to 130 mm of the roughly-shaped steel material for a nitrided part has a microstructure at a depth of 14.5 mm from a surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 70 to 100%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite; and has a microstructure at a depth of 15 mm or more from the surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 0 to less than 50%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite.

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