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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 10253398 B1

PDFFull Text
Date of Patent:
Apr. 09, 2019

Filed:

Nov. 07, 2014

High-strength steel for steel forgings, and steel forging

Applicant:

Kobe Steel, Ltd., Kobe-shi, JP;

Inventors:

Hiroyuki Takaoka, Takasago, JP;

Tomonori Ikegami, Takasago, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/42 (2006.01); C22C 38/48 (2006.01); C22C 38/54 (2006.01); C22C 38/00 (2006.01); C21D 6/00 (2006.01); C21D 8/10 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); B21K 23/00 (2006.01); C21D 1/18 (2006.01); C21D 9/00 (2006.01); C21D 8/00 (2006.01); C21D 9/30 (2006.01); C21D 7/13 (2006.01);
U.S. Cl.
CPC ...
C22C 38/54 (2013.01); B21K 23/00 (2013.01); C21D 1/18 (2013.01); C21D 6/004 (2013.01); C21D 8/105 (2013.01); C21D 9/0068 (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 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C21D 7/13 (2013.01); C21D 8/00 (2013.01); C21D 9/30 (2013.01); C21D 2211/002 (2013.01); C21D 2211/003 (2013.01); C21D 2211/004 (2013.01); C21D 2211/008 (2013.01);
Abstract

The high-strength steel for steel forgings according to the present invention has a composition that includes, as basic components, C: 0.35 mass % to 0.47 mass %; Si: 0 mass % to 0.4 mass %; Mn: 0.6 mass % to 1.5 mass %; Ni: more than 0 mass % up to 2.0 mass %; Cr: 0.8 mass % to 2.5 mass %; Mo: 0.10 mass % to 0.7 mass %; V: 0.035 mass % to 0.20 mass %; Al: 0.015 mass % to 0.050 mass %; N: 30 ppm to 100 ppm, and O: more than 0 ppm up to 30 ppm, the balance being Fe and inevitable impurities. The metal structure is mainly bainite, martensite or a mixed structure of bainite and martensite. Among cubic B1-type precipitates, the number of coherent precipitates having a diameter equal to or smaller than 30 nm is equal to or smaller than 50/μm.

Find Patent Forward Citations

Takaoka, Hiroyuki. (2019). High-strength steel for steel forgings, and steel forging (U.S. Patent No. 10253398). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10253398

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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