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:
Dec. 21, 2021
Filed:
Oct. 31, 2017
Nippon Steel Corporation, Tokyo, JP;
Takayuki Kagaya, Tokyo, JP;
Kazuyuki Kashima, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A nickel-containing steel plate for use at a low temperature, having a predetermined chemical composition, in which the volume fraction of retained austenite at a position 1.5 mm from the surface of the steel plate in the thickness direction is from 3.0 to 20.0% by volume; in which the maximum distance between adjacent grains of retained austenite on prior austenite grain boundaries at the position 1.5 mm from the surface of the steel plate in the thickness direction is 12.5 μm or less; and in which the circle equivalent diameter of grains of retained austenite at a position corresponding to ¼ of the plate thickness from the surface of the steel plate in the thickness direction is 2.5 μm or less. A tank for use at a low temperature, which is produced using the above described nickel-containing steel plate for use at a low temperature.