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. 07, 2021
Filed:
Feb. 23, 2018
Nippon Steel Corporation, Tokyo, JP;
Yusuke Miyakoshi, Tokyo, JP;
Motoki Takasuga, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A non-heat treated steel bar according to the present disclosure has a chemical composition consisting of, in mass percent, C: 0.39 to 0.55%, Si: 0.10 to 1.00%, Mn: 0.50 to 1.50%, P: 0.010 to 0.100%, S: 0.040 to 0.130%, Cr: 0.05 to 0.50%, V: 0.05 to 0.40%, Ti: 0.10% to 0.25%, Al: 0.003 to 0.100%, and N: 0.020% or less, with the balance being Fe and impurities, and satisfying Formula (1). A number density of AlO-based inclusions in each of which AlOis contained at 70.0% or more in mass % and √AREA is not less than 3 μm is 0.05 to 1.00/mm.0.60≤C+0.2Mn+0.25Cr+0.75V+0.81Mo≤1.00  (1)