In the rolling of seamless steel tubes, particularly in the production procedure of accuracy seamless steel tubes, just how does the acid pickling procedure continue? Today, the strange shroud is introduced for you!

Using pickling, surface treatment, steel pickling to remove scale and rust from steel surfaces is called pickling. Iron oxides (Fe3O4, Fe2O3, FeO, and so on), such as scales as well as corrosion, chemically react with the acid remedy to develop salts that are liquified in the acid solution as well as got rid of. Pickling acids include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, and also blended acids.


Primarily fertilized pickling, jet pickling as well as acid paste rust removal. As a whole, the impregnation pickling method is normally used, and also the spray technique can be utilized in mass production. Steel components are generally pickled in 10% to 20% (by quantity) sulfuric acid remedy at a temperature of 40 ° C. When the iron web content in the remedy goes beyond 80g/L and the ferrous sulfate exceeds 215g/L, the acid remedy should be transformed. At area temperature, pickling of steel with 20% to 80% (by quantity) hydrochloric acid remedy is not susceptible to over-corrosion and also hydrogen embrittlement. As a result of the excellent result of acid on steel corrosion, deterioration inhibitors need to be included. After cleaning, the metal surface becomes silver white, as well as the surface area is passivated to improve the deterioration resistance of the stainless-steel.

In order to remove the surface area adsorption of the diatomaceous planet provider and lower the tailing of the chromatographic tops, the service provider should be acid-washed or alkali-washed before use. Pickling is executed by dipping the provider with 6 mol/L hydrochloric acid for 2 hrs or heating with concentrated hydrochloric acid for half an hour, filtering, washing with water to nonpartisanship, as well as drying. Pickling gets rid of contaminations such as iron, aluminum, calcium, and magnesium externally however does not eliminate silanol groups. Pickling supports appropriate for the evaluation of acidic examples.

Degreasing and also derusting the surface of precision seamless steel tubes to get ready for the following process. In the manufacturing procedure, the pickling procedure is to eliminate the surface oxide skin, after the lubrication therapy (carbon steel - phosphorus saponification, stainless-steel - tallow lime, copper aluminum - oiled), with the old procedure - copper plating), and after that Carry out deep processing. If the steel pipe is not marinaded and there may be oxides and oil on the surface area, the phosphating option can not remove them and also the high quality of phosphating will certainly be reduced.