The technology to prevent that the Zn-layer is pressed down by the Conductor roll in Vertical cell in Electolytic Galvanizing Line

摘要

The present invention, in order to eliminate the quality defects caused by the linear plated surface pressing caused by the solid solution carbon on the back of the plated steel sheet during electro-galvanizing, continuous cold rolling mill (TCM) and rolling mill (SPM) rolling roll processing mode and The present invention relates to a method and theory of eliminating linear plated surface crushing caused by solid carbon in a range that does not affect the product's other properties through elongation adjustment in continuous annealing lines.;When the carbon content of 200ppm or more is put into the electroplating line in the situation that the continuous annealing facility is not a batch annealing furnace (BAF) annealing facility, the plated surface crushing phenomenon occurs due to the dissolved carbon. Cold plated products are not a problem in the quality itself when the plated surface is pressed by the wires, but there is a great demand for the production of the raw materials. However, if the use of IF steel (Interstitial Free-Steel) to remove the plated surface crushing caused by dissolved carbon is a cost increase factor, the price competitiveness will inevitably decrease.;Therefore, the present invention, even if the input of ordinary carbon steel CQ (more than 200ppm carbon) material other than IF steel to eliminate the plated surface crushing caused by solid carbon, the same quality difference between the back surface and the top surface of the plated steel sheet, which is unsatisfactory demand Provides plated layer anti-press steel sheet manufacturing technology to produce at a high level.