Carbon Steel pickling

Carbon Steel pickling

Carbon steel pickling consists in surface treatment used to remove impurities, such as rust, stains, or inorganic contaminants, from carbon steel usually after hot working processes that leave a discoloring oxide layer or scale on the surface.

In order to remove the scale, the workpiece is dipped into a vat of pickle liquor, which contains strong acids. In carbon steel applications, the primary acid used is hydrochloric acid, although sulfuric acid was previously more common. Hydrochloric acid is more expensive than sulfuric acid, but it pickles much faster while minimizing base metal loss.


Pickling baths

Pickling baths shall be heated and then maintained at a temperature of 90°C (195°F) (or lower) for efficiency purpose. The heating loops include some fiber reinforced plastic piping, a corrosion resistant pump and an impervious graphite heat exchanger.


GAB Neumann’s process equipment

GAB Neumann offers graphite block heat exchangers, graphite heaters, and annular groove graphite heat exchangers to carbon steel producers for the heating of their pickling baths. 2 to 6 bar (30 to 90 psi) steam is usually used on service side.


Associated products:

Impervious graphite block heat exchangers

Impervious graphite annular partial condensers

GAB Neumann GmbH

Alemannenstrasse 29

79689 Maulburg


Tel: +49 (7622) 6751 0

Fax: +49 (7622) 6751 20

GAB Neumann GmbH | Alemannenstrasse 29 | D-79689 Maulburg | Phone +49 (7622) 6751 0 | Fax +49 (7622) 6751 20 | E-Mail |