Hot dip galvanized steel pipe is first pickling, in order to remove iron oxide on the surface of the steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
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Cold rolled steel if heated to the annealing temperature, the surface color due to high temperature contact with the air turns black, called black steel. Its surface is black because it has not been polished. The physical properties become soft for further welding into steel pipes. Common hardness 57HRB, can also be retreated to different hardness according to the need.
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Cold plate is made of ordinary carbon structural steel hot rolled steel strip, after further cold rolling into a thickness of less than 4mm steel plate. Due to rolling at room temperature, no oxide sheet is produced
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Hot dip galvanized steel pipe is first pickling, in order to remove iron oxide on the surface of the steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank.
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Seamless pipe is a kind of hollow section, no joint around the strip of steel
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Hot dip galvanized steel pipe is first pickling, in order to remove iron oxide on the surface of the steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank.
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