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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 10808304 B1

PDFFull Text
Date of Patent:
Oct. 20, 2020

Filed:

Jul. 19, 2017

Steel for induction hardening

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Yutaka Neishi, Tokyo, JP;

Akira Shiga, Tokyo, JP;

Kei Miyanishi, Tokyo, JP;

Assignee:

Nippon Steel Corporation, Tokyo, JP;

Attorney:

Banner & Witcoff, Ltd.

Primary Examiner:

Brian D Walck

Int. Cl.
CPC ...
C22C 38/28 (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 38/26 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C21D 1/06 (2006.01); C21C 7/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/28 (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 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/54 (2013.01); C21C 7/00 (2013.01); C21D 1/06 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.58 to 0.68%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and by area fraction, 85% or more of pearlite. In the steel, a ratio of a number of composite inclusions to a total number of AlOinclusions and the composite inclusions that contain 2.0% or more of SiOand 2.0% or more of CaO is 20% or more./7+/5+/9+/2.5≤1.05  (1)/10+/20+/25≥0.70  (2)≤0.20  (3)

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