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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 10494688 B1

PDFFull Text
Date of Patent:
Dec. 03, 2019

Filed:

Feb. 02, 2016

Hot-working tool and manufacturing method therefor

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventor:

Yousuke Nakano, Yasugi, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Cam N Nguyen

Int. Cl.
CPC ...
B21D 37/01 (2006.01); B21D 37/20 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (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 38/30 (2006.01); C22C 38/34 (2006.01); C22C 38/40 (2006.01); C21D 8/00 (2006.01); B21J 13/02 (2006.01); B22D 17/22 (2006.01);
U.S. Cl.
CPC ...
C21D 8/005 (2013.01); B21D 37/01 (2013.01); B21D 37/20 (2013.01); B21J 13/02 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (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 38/30 (2013.01); C22C 38/34 (2013.01); C22C 38/40 (2013.01); B22D 17/22 (2013.01); C21D 2211/001 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided is a hot-working tool capable of maintaining adequate toughness even if the permissible amount of P contained in the hot-working tool is increased. The present invention is a hot-working tool, which has a component composition that can be adjusted to a martensitic structure by quenching and has a post-quenching and tempering martensitic structure, wherein: the component composition comprises greater than 0.020 mass % to 0.050 mass % of P; prior austenite grain diameter in said post-quenching and tempering martensitic structure is at least No. 9.5 in grain size number according to JIS-G-0551; and the P concentration of the grain boundary of said prior austenite particles is not more than 1.5 mass %. A hot-working tool wherein said component composition also comprises not more than 0.0250 mass % of Zn is preferable. The present invention also is a method for manufacturing a hot-working tool in which quenching and tempering are performed on a hot-working tool material with said component composition.

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