Method of treating strip surfaces for metallic coating

Details Method of treating strip surfaces for metallic coating Method of treating strip surfaces for metallic coating

C - Chemistry, Metallurgy

23

C

148/36

C23C 2/38 (2006.01) C21D 9/56 (2006.01) C23C 2/02 (2006.01)

Patent

CA 1104910

ABSTRACT OF THE DISCLOSURE A method of preparing the surfaces of steel strip and sheet stock for fluxless hot dip metallic coating, comprising the steps of passing the stock through a first heating section, continuing the heating of the stock in a second heating section, the atmosphere in the first and second heating sections being isolated from one another, increasing the radiant energy absorptivity of the stock throughout the heating sections, and cooling the stock approximately to the temperature of the molten coating metal. The radiant energy absorptivity is increased by forming a visible iron oxide-containing layer or an iron- oxysulfide layer on the stock surfaces in the first heating section and preserving the oxide layer throughout the second heating section.

293785

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