Process for pickling a piece of steel and in particular a sheet strip of stainless steel
US5992196A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B2015/0071
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.