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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 10240225 B1

PDFFull Text
Date of Patent:
Mar. 26, 2019

Filed:

Sep. 17, 2015

Steel material, material processing method, and material processing apparatus

Applicant:

Hitachi, Ltd., Tokyo, JP;

Inventors:

Matahiro Komuro, Tokyo, JP;

Masafumi Noujima, Tokyo, JP;

Naoya Okizaki, Tokyo, JP;

Assignee:

HITACHI, LTD., Tokyo, JP;

Attorney:

Volpe and Koenig, P.C.

Primary Examiner:

Jessee R Roe

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 1/34 (2006.01); C22C 38/44 (2006.01); C21D 1/40 (2006.01); C21D 1/04 (2006.01); C21D 6/00 (2006.01); C22C 38/42 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/02 (2006.01); C22C 38/24 (2006.01); C22C 38/10 (2006.01); C22C 38/00 (2006.01); C22C 38/30 (2006.01); C22C 38/52 (2006.01); C23C 8/22 (2006.01); C23C 8/26 (2006.01); H01F 1/16 (2006.01);
U.S. Cl.
CPC ...
C22C 38/44 (2013.01); C21D 1/04 (2013.01); C21D 1/34 (2013.01); C21D 1/40 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 6/008 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/10 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/30 (2013.01); C22C 38/42 (2013.01); C22C 38/52 (2013.01); C23C 8/22 (2013.01); C23C 8/26 (2013.01); H01F 1/16 (2013.01); C21D 2211/005 (2013.01);
Abstract

Disclosed herein is a technique to reduce the residual stress of a steel material while improving the mechanical property and the corrosion resistance of the material. A steel material is provided that includes a plurality of ferrite crystal grains, and a laminar iron-rich phase formed at unidirectionally occurring grain boundaries of all grain boundaries of the ferrite crystal grains. A material processing method is provided that includes: heating a steel material that contains a plurality of ferrite crystal grains; applying a magnetic field to a heated portion while heating the steel material; applying an electric field to the heated portion in a direction that crosses the direction of the applied magnetic field while heating the steel material; and measuring a displacement occurring in the steel material under the magnetic field and the electric field.

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