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. 05, 2019
Filed:
Jun. 23, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Akira Tachiki, Kitakyushu, JP;
Shigeru Hirano, Kitakyushu, JP;
Hirokazu Yokoya, Onga-gun, JP;
Morio Yanagihara, Wuhan, CN;
Yoshiaki Tani, Kitakyushu, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
This steel sheet for containers includes a steel sheet, a Ni coated layer that is formed on at least one surface of the steel sheet, and a chemical treatment layer that is formed on the Ni coated layer. The Ni coated layer contains 10 mg/mto 1,000 mg/mof Ni in terms of an amount of metal Ni, and the chemical treatment layer contains 5 mg/mto 30 mg/mof a Zr compound in terms of an amount of metal Zr. An average roughness Ra of an outermost surface of the chemical treatment layer obtained with a scanning probe microscope is 10 nm to 100 nm, and when a variation amount in a yellowness index measured at one measurement point on the outermost surface of the chemical treatment layer is defined as ΔYI represented by Equation (2), an average of absolute values of the ΔYI obtained at a plurality of the measurement points included in a unit area of the outermost surface is 5.0 or less.ΔYI=YI−YI  (2)