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1) An operating unit that removes iron oxide from a hot rolled product by immersion into a hydrochloric (#3/#5 Picklers) or sulfuric acid solution. 2) The pickler tank contains 5 6% concentrations of sulfuric acid. This solution is kept at a temperature of 180 190 degrees. The purpose of the pickler is to complete the preparation of the steel for plating, by removing any oxides from the surface.