logo

For the Inventor, By the Inventor

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 10844456 B1

PDFFull Text
Date of Patent:
Nov. 24, 2020

Filed:

Mar. 01, 2016

Cold work tool and method for manufacturing same

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventors:

Tatsuya Shouji, Yasugi, JP;

Yukio Shinji, Yasugi, JP;

Katsufumi Kuroda, Yasugi, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Brian D Walck

Int. Cl.
CPC ...
C21D 9/46 (2006.01); B21D 37/01 (2006.01); B21D 37/20 (2006.01); B21J 13/02 (2006.01); B23B 27/14 (2006.01); C21D 1/18 (2006.01); C21D 1/25 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/36 (2006.01); C22C 38/40 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C21D 6/00 (2006.01); C21D 9/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21D 37/01 (2013.01); B21D 37/20 (2013.01); B21J 13/02 (2013.01); B23B 27/14 (2013.01); C21D 1/18 (2013.01); C21D 1/25 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/36 (2013.01); C22C 38/40 (2013.01); C21D 9/0068 (2013.01); C21D 2211/004 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided are: a cold work tool having excellent wear resistance; and a method for manufacturing the cold work tool. A cold work tool which has an ingredient composition that can be prepared into a martensite structure by quenching and which has a martensite structure, wherein the hardness of the cold work tool is 58 HRC or more, the area ratio of a carbide having an equivalent circle diameter of 5 μm or more in the cross-sectional structure of the cold work tool is 4.0% by area or more, and the carbon solid solution fraction, which is expressed by the ratio of the mass ratio of the amount of carbon that is present in the form of a solid solution in the structure of the cold work tool to the mass ratio of the amount of carbon that is contained in the whole of the cold work tool, is 75.0% or more. A method for manufacturing a cold work tool, which is suitable for manufacturing the aforementioned cold work tool.

Find Patent Forward Citations

Loading…