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.:
Date of Patent:
Feb. 13, 2018
Filed:
Sep. 02, 2015
Hitachi Metals, Ltd., Tokyo, JP;
Tatsuya Shouji, Yasugi, JP;
Setsuo Mishima, Yasugi, JP;
Toru Taniguchi, Yasugi, JP;
Katsufumi Kuroda, Yasugi, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
A cold work tool material has an annealed structure including carbides, and a composition including, in mass %, C: 0.80% to 2.40%, Cr: 5.0% to 15.0%, Mo and W contained alone or in combination in an amount of (Mo+½W): 0.50% to 3.00%, and V: 0.10 to 1.50%, and adjusted such that the material has a martensitic structure by quenching. The material includes a cross sectional region of an annealed structure and a length of 90 μm and a width of 90 μm and including no carbides having a circle equivalent diameter exceeding 5.0 μm. In the cross sectional region, a proportion of a number of carbides B having a circle equivalent diameter of more than 0.1 μm and not more than 0.4 μm to a number of carbides A having a circle equivalent diameter of exceeds 0.1 μm and not more than 2.0 μm is greater than 80.0%.