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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 10407747 B1

PDFFull Text
Date of Patent:
Sep. 10, 2019

Filed:

Dec. 27, 2016

Cold working tool material and cold working tool manufacturing method

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventors:

Tatsuya Shouji, Yasugi, JP;

Setsuo Mishima, Yasugi, JP;

Yukio Shinji, Yasugi, JP;

Katsufumi Kuroda, Yasugi, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Jie Yang

Int. Cl.
CPC ...
C21D 6/00 (2006.01); C21D 8/00 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C22C 38/36 (2006.01); C22C 38/60 (2006.01); C21D 1/18 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01);
U.S. Cl.
CPC ...
C21D 8/005 (2013.01); C21D 1/18 (2013.01); C21D 6/00 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/00 (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 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/36 (2013.01); C22C 38/60 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided are a cold working tool material with which high hardness can be obtained in a broad range of tempering temperatures, and a cold working tool manufacturing method using same. The present invention is a cold working tool material comprising a steel component composition that contains, in mass %, C: 0.65-2.40%, Cr: 5.0-15.0%, Mo and W alone or combined (Mo+½W): 0.50-4.00%, V: 0.10-1.50%, and N: greater than 0.0300% to 0.0800%, in which martensitic structure can be adjusted by quenching, and in which, in a 90 μm long 90 μm wide region of a cross-sectional structure that does not contain carbides with equivalent circle diameters exceeding 5.0 μm, the number density of carbides A with equivalent circle diameters greater than 0.1 μm to 2.0 μm is at least 9.0×105/mm2 and the number density of carbides B with equivalent circle diameters greater than 0.1 μm to 0.4 μm is at least 7.5×105/mm2. The present invention is also a cold working tool manufacturing method in which quenching and tempering are performed on said cold working tool material.

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