Metal deforming – With cleaning – descaling – or lubrication of work or product
Patent
1998-09-16
1999-11-30
Butler, Rodney
Metal deforming
With cleaning, descaling, or lubrication of work or product
72200, B21B 4504
Patent
active
059921960
ABSTRACT:
Continuous production line for producing a strip of rolled sheet of steel comprising applying to said sheet of steel an aqueous pickling solution containing hydrochloric acid and ferric and ferrous pickling irons in solution, and, for the purpose of maintaining a constant pickling power of the aqueous solution of hydrochloric acid having a pH lower than 1, maintaining the concentration of Fe.sup.3+ ions at a value between 1 g/liter and 300 g/liter, by reoxidation of the Fe.sup.2+ ions produced during the pickling, the REDOX potential being maintained at a value between 400 and 600 mV, the potential being measured between a platinum electrode and a reference AG/AGCl electrode which are placed in the solution.
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Giraud Henri
Lauverane Marhine
Vialatte Bernard
Butler Rodney
Usinor
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