ASTM A179 Steel Pipe

ASTM A179 low pressure boiler seamless steel tube production 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. Specific as follows: 1, plating pretreatment process

Alkaline cleaning, acid pickling, rinsing, 5 leaching agent, drying process.

1) part of steel tube surface is smeary, require alkaline cleaning.

2) use hydrochloric acid pickling to remove the oxide coating on the surface of the steel pipe.

3) is adhered on the surface of the steel tube to remove the residual acid and ferric salt, 2 times rinse should be carried out for steel pipe.

4) flux function from the steel surface to remove all the impurities, ensure steel tube in contact with the liquid zinc clean, good coating.

5) to prevent carbon steel pipe immersed in zinc pot blasting phenomenon occurs, for drying tube coated with solvent, drying temperature in 120-200 ℃, time of no less than 150 s.

2, hot dip galvanizing process

1) the temperature of molten zinc in zinc pot strict control in 450 + 5 ℃.

2) the drying processing of steel pipe chain by root removed by drying 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 mild steel pipe on the spiral into a tilt state, with the screw rotation, steel tube side move down a slope Angle formation, and then into the liquid zinc, and continue to move down.

4) steel pipe automatic drop on the slippery course of zinc pot, the dial to the outside by ejecting agency, again by machine liquid zinc is put forward.

5) steel pipe up to the magnetic force grinding roller surface, absorb and move to drag out on the table.

3, post-treatment of plating process

Plating post-processing procedure including:, drag out, inside outside wind, water, inspection, passivation and print.

1) steel pipe through the outer ring, there is a row of holes on it, by compressed air, the steel tube excess liquid zinc away, bright and clean appearance.

2) under the satisfy the production rhythm, reduce the drag out speed, can control the amount of zinc, reduce the consumption of zinc.

3) blow can remove steel pipe inner surface excess liquid zinc, obtain the inner surface is bright and clean, be removed the zinc liquid zinc dust formation, be recycled.

4) water tank temperature control at 80 ℃, cooling water pump to the cooling tower for recycled after cooling.

5) water back out of the water tank, on 4 shelves, after the inspection will finish tube into the waste basket, the finished tube into the output table.

In 6) transport after passivation liquid spray ring finished pipe, the pipe surface passivation, after blowing outside ring, use compressed air to blow out redundant passivation solution.

7) delivery after laying in steam heating pipe line of drying stages, after dried, for printing packaging.

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