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Global Dom's Pickling Plants

Pickling plants supplied by Global Dom are characterised by some specific features which make them particularly suitable for cold drawing plants.

The plant pickles tubes come from rolling mills before the production cycle gets started and pickles them after the heat treatment, before starting a new drawing cycle.

The plant uses acid and bonder for a perfect drawing of the tube.

Global Dom ensure a complete plant in terms of chemical and physical management of the tanks, automatic management of the bundles, filling, emptying and heating of the fluids and fumes abatement according to EC standards currently in force.

Furthermore, depending on the chemical process used in the plant, our company can offer the possibility to install secondary plants to purify liquids or air, and a plant for wastewater recirculation.

What are the component parts of a pickling plant?

Hot degreasing tank

Hot washing tank

Hot sulfuric pickling tank

Bonder tank or phosphating tank

Bonder washing tank

Hot neutralization tank

Steam generating system with boiler and piping

Acid fumes abatement system (scraper 1)

Bonder fumes abatement system (scraper 2)

Sulfuric acid filling and emptying circuit

Bonder filling and emptying circuit

Water treatment circuit for washing (not supplied)

Mechanical parts for handling beams in tanks

Air manipulator to load and unload tanks

Tracks for beam supply and transportation

Control and automation system

Hardware and software

What's Pickling?

Pickling is a chemical process carried out to remove surface layers of specific materials through acid or alkali solutions. When metal materials need to be treated, the treatment removes the oxide layer on the surface or other contaminant materials, so that the surface of the metal can be covered with another metal. After the picking process, the treated surface becomes porous, allowing the other metal to firmly bind to the underlying metal. After that, the surface is cleaned from rust residues formed by laminated steel products, surfactants (soaps that increase wetting) and corrosion inhibitors or other chemicals substances, calamine, or lamination scrap. This is one of the most common methods to preparing steel surfaces where the anti-corrosive protective coating is to be applied.

This is also a preliminary process to obtain the best result on those steel tubes placed at industrial drawing plants. In that case, sulfuric acid is used on low alloy steels, while the cloridric acid is used on stainless steels.

A CLOSER LOOK: Pickling of Steel Tubes

Steel tubes are pickled through immersion into hydrochloric acid or sulfuric acid. However, they can also be pickled into phosphoric acid, nitric acid and hydrofluoric acid, at high temperature. For low carbon hot laminated steels, sulfuric acid is the option that is normally chosen.
In the pickling solutions, corrosion inhibitors are often added in order to monitor the attack of the acid onto the bare metal parts and keep it under control, as the layer of oxide is removed quicker than the other parts.
As soon as it is extruded, aluminium is always covered by a layer of oxide whose quantity may vary from time to time. Aluminium is generally pickled into sodium hydroxide.

YOUR PROJECT, OUR EXPERTISE.

Every time you need an expert, feel free to contact us.

Via Foro Boario
324121 Bergamo (BG) - Italy
globaldom@global-dom.com
+39 035 4235003

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Global Dom S.r.l.
C.F. & VAT 04162330163
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