Galvanized cold drawn seamless steel tube with strong corrosion resistance and strength, stiffness, widely used in gas, heat and water transport pipeline.Technological process is: the clarinet, alkaline cleaning, washing, pickling, rinse, leaching agent, drying, hot dip galvanized - - within the outer wind - air cooling, water cooling, passivation, water rinse, inspection, weighing, warehousing.
Disposal process before plating
1) some cold drawn seamless steel tube appearance have oil, require alkaline cleaning.
2) use hydrochloric acid pickling to remove the oxide skin cold drawn seamless steel tube appearance.
3) to get rid of cold drawn seamless steel tube appearance of residual acid and iron salts, need to rinse twice cold drawn seamless steel tube.
4) flux function to remove all impurities from cold drawn seamless steel tube appearance, ensure clean touch, cold drawn seamless steel tube and liquid zinc constitute outstanding coating.
5) to avoid cold drawn seamless steel tube immersed in zinc pot blasting appearance, need to paint on the flux cold drawn seamless steel tubes for drying, drying temperature in 120-200 ℃, time of no less than 150 s.
Hot dip galvanizing process
1) the temperature of molten zinc in zinc pot strict control in 450 + 5 ℃.
2) drying treatment of cold drawn seamless steel tube through the chain by the root out of baking furnace, furnace roller, and then transported to the galvanizing furnace, rolling into the galvanized machine from three leaching zinc in a spiral.
3) three spiral phase is different, make the cold drawn seamless steel tube on the spiral into a skewed, with screw rotation, cold drawn seamless steel tube side moves down a skew Angle, and then into the liquid zinc, and continue to move down.
4) cold drawn seamless steel tube active fell on the slippery course of zinc pot, organized by ejecting the dial to the lateral, again by machine liquid zinc is put forward.
5) cold drawn seamless steel tube to magnetic roller roller surface, absorb and move to drag out on the table.
Disposal after plating process
1) cold drawn seamless steel tube through the outer ring, there is a row of holes on it, by compressed air blowing cold drawn seamless steel tube residual liquid zinc, shiny appearance.
2) under the satisfactory production rhythm, drop drag out speed, can control the amount of zinc, zinc consumption.
3) blow can get rid of cold drawn seamless steel tube in the rest of the liquid zinc appearance, make bright appearance, was get rid of the zinc liquid zinc powder, be retrieved.
4) water tank temperature control at 80 ℃, cooling water pump to the cooling tower for cooling cycle after use.
5) water back out of the water tank, fell on the inspection on the bench, after the inspection will finish tube into the waste basket, the finished tube into the output table.
6) transport in the finished product through the loops of passivation liquid spray blow pipe, the pipe surface passivation, after blowing outside ring, use compressed air to blow out the rest of the passivation solution.
7) delivery by laying in steam heating pipe line of drying stages, after dried, for printing packaging.
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