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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 10570478 B1

PDFFull Text
Date of Patent:
Feb. 25, 2020

Filed:

Jun. 08, 2015

Steel for mechanical structure for cold working, and method for producing same

Applicant:

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

Inventors:

Yuki Sasaki, Hyogo, JP;

Takehiro Tsuchida, Hyogo, JP;

Takuya Kochi, Hyogo, JP;

Koji Yamashita, Hyogo, JP;

Masamichi Chiba, Hyogo, JP;

Kei Masumoto, Hyogo, JP;

Masayuki Sakata, Hyogo, JP;

Assignee:

KOBE STEEL, LTD., Kobe-shi, JP;

Attorney:

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

Primary Examiner:

Jessee R Roe

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C22C 38/04 (2006.01); C21D 9/52 (2006.01); C21D 8/06 (2006.01); C22C 38/18 (2006.01); B21B 1/22 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/20 (2006.01);
U.S. Cl.
CPC ...
C21D 9/525 (2013.01); B21B 1/22 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/06 (2013.01); C21D 8/065 (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 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); B21B 2001/225 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

Provided is a steel for a mechanical structure for cold working, which contains C, Si, Mn, P, S, Al and N and in which the metal structure includes pearlite and ferrite, the total areal proportion of pearlite and ferrite relative to the overall structure is 90% or higher, the average circle-equivalent diameter of bcc-Fe crystal grains surrounded by large angle grain boundaries is 5-15 μm, the average aspect ratio of pro-eutectoid ferrite crystal grains is 3.0 or lower, and the average spacing at the narrowest pearlite lamellar spacing is 0.20 μm or less.

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