Process for pickling a piece of steel and in particular a sheet strip of stainless steel
US5851304A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Feb 27, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B2015/0071
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The process comprises applying 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/litre and 300 g/litre, by reoxidation by means of an oxygenation of the Fe.sup.2+ ions produced during the pickling, the REDOX potential being maintained at a value between 0 and 800 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.