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:
Sep. 10, 2019
Filed:
Nov. 21, 2014
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Kengo Takeda, Tokyo, JP;
Toshimasa Tomokiyo, Tokyo, JP;
Yasushi Tsukano, Tokyo, JP;
Takashi Aramaki, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A high-carbon steel sheet has a chemical composition represented by, in mass %, C: 0.60% to 0.90%, Mn: 0.30% to 1.50%, and Cr: 0.20% to 1.00%, and others, and has a structure represented by a concentration of Mn contained in cementite: 2% or more and 8% or less, a concentration of Cr contained in cementite: 2% or more and 8% or less, an average grain diameter of ferrite: 10 μm or more and 50 μm or less, an average particle diameter of cementite: 0.3 μm or more and 1.5 μm or less, and a spheroidized ratio of cementite: 85% or more.