Galvannealed sheet steel and process for production thereof
A technology of hot-dip galvanized steel sheet and manufacturing method, applied in hot-dip galvanizing process, metal material coating process, coating and other directions, can solve the problems of non-disclosure, uneven trace components, difficult countermeasures, etc., and achieve coating properties Excellent, good looking results
Active Publication Date: 2008-04-16
NIPPON STEEL CORP
12 Cites 13 Cited by
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Abstract
The invention aims at providing galvannealed sheet steel excellent in corrosion resistance, workability, coatability and appearance and a process for the production thereof. The invention relates to a process for the production of galvannealed sheet steel which comprises subjecting an ultra low carbon steel sheet to surface cleaning and preplating with nickel, heating the resulting sheet rapidly either in the absence of oxygen or in a reducing atmosphere to a sheet temperature of 430 to 500 DEG C at a temperature rise rate of 30 DEG C/sec or above, plating the sheet in a plating bath of molten Zn, wiping the resulting sheet, heating the sheet rapidly to 470 to 600 DEG C at a temperature rise rate of 30 DEG C/sec or above, and then cooling the sheet either without soaking or after soaking for less than 15 seconds. The galvannealed steel sheet produced by the process is composed of an ultra low carbon steel sheet and a galvannealed layer formed on at least one side of the sheet which layer comprises by mass Fe: 8 to 13 %, Ni: 0.05 to 1.0%, and Al: 0.15 to 1.5% with the balance being Zn and unavoidable impurities, and has an Al/Ni ratio of 0.5 to 5.0, the mean thickness of G layer present on the interface of basis steel being 1 m or below and the dispersion of the thickness falling within +- 0.3 m.
Application Domain
Hot-dipping/immersion processes
Technology Topic
Rise rateHot-dip galvanization +8
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