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:
Nov. 02, 2021
Filed:
Aug. 08, 2018
Osaka University, Suita, JP;
Komatsu Ltd., Tokyo, JP;
Yoritoshi Minamino, Suita, JP;
Koji Hagihara, Suita, JP;
Koji Yamamoto, Tokyo, JP;
Shohei Ikurumi, Tokyo, JP;
Yusuke Hiratsuka, Himeji, JP;
Takeshi Fujimatsu, Himeji, JP;
Toshiyuki Sugimoto, Himeji, JP;
OSAKA UNIVERSITY, Suita, JP;
KOMATSU LTD., Tokyo, JP;
Abstract
A steel with high hardness and excellent toughness contains, in mass %, 0.40-1.00% C, 0.10-2.00% Si, 0.10-1.00% Mn, 0.030% or less P, 0.030% or less S, 1.10-3.20% Cr, 0.010-0.10% Al, and 0.15-0.50% V, and further contains at least one or two of 2.50% or less Ni and 1.00% or less Mo, with an amount of (C+V) being 0.60% or more in mass %, with the balance consisting of Fe and unavoidable impurities. The steel has a microstructure which is a martensitic structure with finely dispersed Fe-based ε carbides, with its prior austenite grain size being 20 μm or less.