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. 27, 2001
Filed:
Jul. 06, 2000
Hisatada Nakakoji, Chiba, JP;
Kyoko Hamahara, Chiba, JP;
Kazuo Mochizuki, Chiba, JP;
Kazumi Yamashita, Chiba, JP;
Kawasaki Steel Corporation, Tokyo, JP;
Abstract
A galvanized steel sheet includes a galvanized coating layer having a coating weight of from about 20 to about 60 g/m,formed on at least one surface of the steel sheet, and a zinc phosphate coating layer having a coating weight of from about 0.5 to about 3.0 g/m,formed on the galvanized coating layer. The zinc phosphate coating layer contains from about 0.5 to about 10.0 percent by weight of magnesium, from about 0.1 to about 2.0 percent by weight of nickel, and from about 0.5 to about 8.0 percent by weight of manganese. However, the manganese content and the nickel content satisfy the following relationship: [Ni]×7.6−10.9≦[Mn]≦[Ni]×11.4 wherein [Mn] represents the manganese content, in percent by weight, and [Ni] represents the nickel content, in percent by weight. This steel sheet exhibits superior perforative corrosion resistance. The steel sheet also exhibits superior press workability by further controlling the magnesium, nickel, and manganese contents.