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Handan City Costu Fastener Manufacturing Co., Ltd. specializes in: expansion bolts, anchor bolts, hot-dip galvanized bolts, welding nails, pins, drill tail wire, U-shaped wire, heart-shaped ring.
Handan City Costu Fastener Manufacturing Co., Ltd. specializes in expansion bolts, anchor bolts, hot-dip galvanized bolts, custom-made parts, gaskets, etc. Welcome to call 15533335522
Hot-dip galvanized bolts for annealing outside the line!
Hot-dip galvanized bolt external annealing: before the hot-rolled or cold-rolled steel sheet enters the hot-dip galvanizing line, it is first recrystallized in the bottoming annealing furnace or the hood annealing furnace. Therefore, the galvanizing line is not There is an annealing process. The steel sheet must be bonded to a clean, pure iron active appearance in the absence of oxides and other contaminants prior to hot dip galvanizing. This method is to remove the annealed appearance of iron oxide skin by pickling, and then apply a layer of zinc chloride or a solvent composed of ammonium chloride and zinc chloride to protect the steel plate from oxidation. .