EP 0792949 A1 19970903 - Process for pickling a steel workpiece, in particular stainless steel sheet strip
Title (en)
Process for pickling a steel workpiece, in particular stainless steel sheet strip
Title (de)
Verfahren zum Beizen von Stahlwerkstücken, insbesondere Blechband aus rostfreiem Stahl
Title (fr)
Procédé de décapage d'une pièce en acier et notamment d'une bande de tÔle en acier inoxydable
Publication
Application
Priority
FR 9602405 A 19960227
Abstract (en)
In a steel pickling process, especially for stainless steel strip, employing an aqueous hydrochloric acid pickling solution, the Fe(III) ion concentration is maintained at 1-300 g/l, for constant pickling capacity of the solution of pH less than 1, by oxygenation (preferably aeration) to effect re-oxidation of the Fe(II) ions generated during pickling, the redox potential being maintained at a value of 0-800 (preferably 400-600) mV as measured between a Pt electrode and an Ag/AgCl reference electrode in the solution. Also claimed is a continuous rolled steel (especially stainless steel) strip production line employing the above process, in which the strip is subjected to mechanical treatment (e.g. stretch-levelling and/or peening), primary pickling, working (e.g. rolling), annealing, final pickling and finishing (e.g. skin pass rolling), at least one of the pickling operations being carried out by the above process.
Abstract (fr)
Procédé de décapage d'une pièce en acier et notamment d'une bande de tôle en acier inoxydable, consistant à appliquer une solution aqueuse de décapage constituée d'acide chlorhydrique et d'ions ferriques et ferreux de décapage en solution, et en vue de conserver un pouvoir décapant constant dans la solution aqueuse d'acide chlorhydrique ayant un pH inférieur à 1, à maintenir la concentration en ions Fe<3+>, à une valeur comprise entre 1 g/litre et 300 g/litre, par réoxydation au moyen d'une oxygénation des ions Fe<2+> générés lors du décapage, le potentiel REDOX étant maintenu à une valeur comprise entre 0 et 800 mV potentiel mesuré entre une électrode de platine et une électrode de référence Ag/AgCl placées dans la solution.
IPC 1-7
IPC 8 full level
B21B 45/06 (2006.01); C23G 1/08 (2006.01); B21B 1/22 (2006.01); B21B 1/36 (2006.01); B21B 3/02 (2006.01); B21B 15/00 (2006.01)
CPC (source: EP KR US)
B21B 45/06 (2013.01 - EP US); C23G 1/08 (2013.01 - EP KR US); C23G 1/086 (2013.01 - EP US); B21B 1/36 (2013.01 - EP US); B21B 3/02 (2013.01 - EP US); B21B 2001/228 (2013.01 - EP US); B21B 2015/0071 (2013.01 - EP US)
Citation (search report)
- [Y] EP 0501867 A1 19920902 - UGINE SA [FR]
- [A] DE 3719604 A1 19881222 - BRINGMANN MARKUS MARIA DIPL IN [DE]
- [DA] FR 2551465 A3 19850308 - GUEUGNON SA FORGES [FR]
- [DA] FR 2587369 A1 19870320 - UGINE GUEUGNON SA [FR] & EP 0236354 A1 19870916 - UGINE GUEUGNON SA [FR]
- [A] EP 0188975 A1 19860730 - CHETREFF BERNARD
- [A] GB 2000196 A 19790104 - TOKAI ELECTRO CHEMICAL CO
- [A] EP 0505606 A1 19920930 - ITB SRL [IT]
- [A] FR 2399488 A1 19790302 - BEUGIN SA EXPL PROCEDES [FR]
- [E] EP 0769574 A1 19970423 - NOVAMAX ITB S R L [IT]
- [X] CHEMICAL ABSTRACTS, vol. 84, no. 24, 14 June 1976, Columbus, Ohio, US; abstract no. 168136g, MIZUNUMA: "Descaling of stainless steel" XP002016316 & JP S5047826 A 19750428
- [Y] PATENT ABSTRACTS OF JAPAN vol. 007, no. 167 (C - 177) 22 July 1958 (1958-07-22)
- [DA] PATENT ABSTRACTS OF JAPAN vol. 014, no. 497 (C - 0774) 15 August 1990 (1990-08-15)
- [A] PATENT ABSTRACTS OF JAPAN vol. 005, no. 012 (C - 040) 24 January 1981 (1981-01-24)
- [A] PATENT ABSTRACTS OF JAPAN vol. 013, no. 011 (C - 558) 11 January 1989 (1989-01-11)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE
DOCDB simple family (publication)
EP 0792949 A1 19970903; EP 0792949 B1 20010509; AT E201057 T1 20010515; AU 1488497 A 19970911; AU 711782 B2 19991021; BR 9701076 A 19980901; CA 2198631 A1 19970827; CA 2198631 C 20040831; CN 1084801 C 20020515; CN 1168823 A 19971231; DE 69704732 D1 20010613; DE 69704732 T2 20010913; ES 2156344 T3 20010616; FR 2745301 A1 19970829; FR 2745301 B1 19980403; JP 4186131 B2 20081126; JP H101791 A 19980106; KR 100448972 B1 20041208; KR 970062075 A 19970912; MX 9701425 A 19980331; TW 517099 B 20030111; US 5851304 A 19981222; US 5992196 A 19991130; ZA 971647 B 19980826
DOCDB simple family (application)
EP 97400433 A 19970226; AT 97400433 T 19970226; AU 1488497 A 19970225; BR 9701076 A 19970226; CA 2198631 A 19970226; CN 97109913 A 19970226; DE 69704732 T 19970226; ES 97400433 T 19970226; FR 9602405 A 19960227; JP 5701797 A 19970225; KR 19970006274 A 19970227; MX 9701425 A 19970225; TW 86104093 A 19970331; US 15451598 A 19980916; US 80763497 A 19970227; ZA 971647 A 19970226