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AssigneeKawasaki Steel Metal Products & Engineering Inc.
InventorsKazuhiro Hayashi, Masao Taguchi, Yasumasa Fukushima, Masato Takagi, Shinichi Noma
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A method for making an enameled steel sheet includes the steps of spraying a slurry to form a slurry layer onto a surface of a substrate and firing the slurry layer. In this method, the slurry has a static surface tension of 50 dyne/cm or less and an apparent viscosity of 500 mPa·s that is measured with a model E viscometer at a rotation of 100 rpm. Alternatively, the method includes a step of spraying a slurry for forming an enamel layer onto a surface of a substrate, wherein the substrate is vibrated when the slurry is applied or when the slurry applied is still fluid.
A method for making an enameled steel sheet comprising the steps of spraying a slurry to form a slurry layer onto a surface of a substrate and firing the slurry layer, wherein the slurry has a static surface tension of 50 dyne/cm or less and an apparent viscosity of 500 mPa·s that is measured with a model E viscometer at a rotation of 100 rpm.
A method for making an enameled steel sheet comprising a step of spraying a slurry for forming an enamel layer onto a surface of a substrate, wherein the substrate is vibrated when the slurry is applied or when the slurry applied is still fluid.
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1. Field of the Invention
The present invention relates to a method for making an enameled steel sheet. In particular, the present invention relates to a method for making an enameled steel sheet having a flat (smooth) surface that is suitable for marker boards, black boards, tunnel interior materials, building interior and exterior boards, and the like.
2. Description of the Related Art
EXAMPLES according to the present invention and COMPARATIVE EXAMPLES will now be described.
A nickel-plated steel sheet composed of a 0.6-mm thick plain steel sheet of which the two faces were coated with nickel plating layers having a total plating density of 100 mg/m2 for the two layers was subjected to degreasing treatment and alkaline etching treatment.
An undercoating slurry having a composition shown in Table 1 was sprayed onto the nickel-plated steel sheet to form a wet film with a thickness of about 50 μm, and was fired at 810° C. for 2 minutes in an electric oven to prepare an undercoating enamel steel sheet.