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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 10793937 B1

PDFFull Text
Date of Patent:
Oct. 06, 2020

Filed:

Feb. 20, 2015

Steel for induction hardening

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Toshiharu Aiso, Villavägen Uppsala, SE;

Suguru Yoshida, Hokkaido, JP;

Kei Miyanishi, Hokkaido, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Christopher S Kessler

Int. Cl.
CPC ...
C22C 38/60 (2006.01); C21D 1/42 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C21D 8/02 (2006.01); C22C 38/40 (2006.01); C22C 38/18 (2006.01); C22C 38/08 (2006.01); C21D 1/10 (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); C21D 9/30 (2006.01); C21D 9/32 (2006.01); B22D 11/22 (2006.01); C21D 9/40 (2006.01); B22D 11/16 (2006.01); C21D 6/00 (2006.01); C22C 38/42 (2006.01);
U.S. Cl.
CPC ...
C22C 38/60 (2013.01); C21D 1/10 (2013.01); C21D 1/42 (2013.01); C21D 8/02 (2013.01); C21D 8/0247 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/18 (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 38/40 (2013.01); B22D 11/16 (2013.01); B22D 11/22 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/30 (2013.01); C21D 9/32 (2013.01); C21D 9/40 (2013.01); C21D 2211/004 (2013.01); C22C 38/42 (2013.01); Y02P 10/253 (2015.11);
Abstract

A steel for induction hardening according to an aspect includes, as a chemical composition, predetermined amounts of alloy elements and a remainder including Fe and impurities, in which Al×N is 0.000330 to 0.000825, Mn/S is 4.6 to 14.0, a machinability index M is 15.5 to 25.65, an area fraction of AlN having an equivalent circle diameter of more than 200 nm at a ¼ position of a diameter of the steel is 20% or less of an area fraction of all AlN having an equivalent circle diameter of 40 nm or more, and a number density of Mn sulfide-based inclusions having a maximum diameter of 0.3 μm or more and 10 μm or less at the ¼ position of the diameter is 100 pieces/mmor more and 2500 pieces/mmor less.

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