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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 10669604 B1

PDFFull Text
Date of Patent:
Jun. 02, 2020

Filed:

Jun. 27, 2016

Bolt

Applicants:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Aoyama Seisakusho Co., Ltd., Aichi, JP;

Inventors:

Yutaka Neishi, Muroran, JP;

Makoto Kosaka, Kisarazu, JP;

Naoki Matsui, Kisarazu, JP;

Tetsushi Chida, Nishinomiya, JP;

Keisuke Chiba, Toyota, JP;

Hideo Kanisawa, Aichi, JP;

Kazutaka Aoyama, Aichi, JP;

Kazuoki Shibuya, Aichi, JP;

Ryoko Inagaki, Aichi, JP;

Assignees:

NIPPON STEEL CORPORATION, Tokyo, JP;

AOYAMA SEISAKUSHO CO., LTD., Aichi, JP;

Attorney:

Clark & Brody LLP

Primary Examiner:

Melvin C Mayes

Assistant Examiner:

Christopher Douglas Moody

Int. Cl.
CPC ...
C21D 8/00 (2006.01); C21D 9/00 (2006.01); C22C 38/54 (2006.01); F16B 35/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/00 (2006.01); C22C 38/26 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C21D 1/25 (2006.01); C22C 38/24 (2006.01); C21D 6/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/0093 (2013.01); C21D 1/25 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (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 38/20 (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 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); F16B 35/00 (2013.01); C21D 9/00 (2013.01); C21D 2211/008 (2013.01);
Abstract

A bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to an embodiment of the present invention consists of, in mass %, C: 0.32 to 0.39%, Si: 0.15% or less, Mn: 0.40 to 0.65%, P: 0.020% or less, S: 0.020% or less, Cr: 0.85 to 1.25%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.050%, B: 0.0010 to 0.0030%, N: 0.0015 to 0.0080%, O: 0.0015% or less, Mo: 0 to 0.05%, V: 0 to 0.05%, Cu: 0 to 0.50%, Ni: 0 to 0.30%, and Nb: 0 to 0.05%, with the balance being Fe and impurities. The bolt satisfies Formula (1) and Formula (2), and has a tensile strength of 1000 to 1300 MPa and satisfies Formula (3).4.9≤10C+Si+2Mn+Cr+4Mo+5V≤6.1  (1)Mn/Cr≤0.55  (2)[dissolved Cr]/Cr≥0.70  (3)

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