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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 9914990 B1

PDFFull Text
Date of Patent:
Mar. 13, 2018

Filed:

Apr. 04, 2013

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

Applicant:

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

Inventors:

Koji Yamashita, Kobe, JP;

Takehiro Tsuchida, Kobe, JP;

Masamichi Chiba, Kobe, JP;

Assignee:

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

Attorney:

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

Primary Examiner:

Xiaowei Su

Int. Cl.
CPC ...
C22C 38/46 (2006.01); C21D 1/00 (2006.01); C22C 38/42 (2006.01); C22C 38/32 (2006.01); C22C 38/28 (2006.01); C22C 38/00 (2006.01); C22C 38/24 (2006.01); C22C 38/22 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C21D 8/06 (2006.01); C22C 38/60 (2006.01); C21D 6/00 (2006.01); C22C 38/18 (2006.01); C22C 38/26 (2006.01); C22C 38/40 (2006.01); C21D 1/32 (2006.01); C21D 8/00 (2006.01); C21D 9/52 (2006.01);
U.S. Cl.
CPC ...
C22C 38/46 (2013.01); C21D 1/00 (2013.01); C21D 1/32 (2013.01); C21D 6/002 (2013.01); C21D 8/005 (2013.01); C21D 8/06 (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 38/18 (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); C22C 38/42 (2013.01); C22C 38/60 (2013.01); C21D 9/52 (2013.01); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

The present invention is a steel for a mechanical structure for cold working, the steel characterized in containing C, Si, Mn, P, S, Al, N, and Cr, the remainder being iron and inevitable impurities; the metal composition having pearlite and pro-eutectoid ferrite; the combined area of the pearlite and pro-eutectoid ferrite being 90% or more of the total composition; the area percentage A of the pro-eutectoid ferrite having the relationship A>Ae, where Ae=(0.8−Ceq)×96.75 (Ceq=[C]+0.1×[Si]+0.06×[Mn]−0.11×[Cr], and '(element names)' indicates the element content (percent in mass); and the mean grain size of the pro-eutectoid ferrite and the ferrite in the pearlite being 15 to 25 μm.

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