Global Patent Index - EP 0910676 B1

EP 0910676 B1 2001-01-10 - PROCESS FOR PRODUCING A GRAIN-ORIENTATED ELECTRICAL STEEL SHEET

Title (en)

PROCESS FOR PRODUCING A GRAIN-ORIENTATED ELECTRICAL STEEL SHEET

Title (de)

VERFAHREN ZUR HERSTELLUNG VON KORNORIENTIERTEM ELEKTROBLECH

Title (fr)

PROCEDE POUR PRODUIRE UNE TOLE ELECTRIQUE A GRAINS ORIENTES

Publication

EP 0910676 B1 (DE)

Application

EP 97930498 A

Priority

  • DE 19628136 A
  • EP 9703510 W

Abstract (en)

[origin: DE19628136C1] The invention relates to a process for producing a grain-orientated electrical steel sheet in which a steel slab is soaked at a temperature which is lower than the solubility temperature for manganese sulphide but above the solubility temperature for copper sulphide. The slab is subsequently hot-rolled at a starting temperature of at least 960 DEG C and at an end temperature in the range of 880 to 1000 DEG C to provide a hot-strip final thickness in the range of 1.5 to 7.0 mm. The hot strip is subsequently annealed at a temperature in the range of 880 to 1150 DEG C and cooled at a rate of above 15 K/s. The hot strip is cold rolled in one or a plurality of cold rolling stages. There follows recrystallisating annealing with simultaneous decarburisation, application of a separating agent, high temperature annealing and, after application of an insulating layer, final annealing. The invention is characterised in that the cold strip for high-temperature annealing is heated in an atmosphere containing less than 25 vol. % of H2, the remainder being nitrogen and /or a noble gas, at least until the critical temperature is obtained.

IPC 1-7 (main, further and additional classification)

C21D 8/12; C22C 38/02

IPC 8 full level (invention and additional information)

C21D 9/46 (2006.01); B21B 1/46 (2006.01); C21D 1/76 (2006.01); C21D 8/12 (2006.01); C21D 9/56 (2006.01); C21D 9/573 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/16 (2006.01); H01F 1/18 (2006.01)

CPC (invention and additional information)

C21D 8/1272 (2013.01); C21D 1/76 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1261 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

DE 19628136 C1 19970424; AT 198629 T 20010115; AU 3442897 A 19980209; AU 710053 B2 19990909; BR 9710302 A 19990817; CN 1078256 C 20020123; CN 1219977 A 19990616; CZ 288875 B6 20010912; CZ 9900068 A3 19991013; DE 59702901 D1 20010215; EP 0910676 A1 19990428; EP 0910676 B1 20010110; ES 2154904 T3 20010416; ID 17500 A 19980108; ID 19071 A 19980611; IN 191758 B 20031227; JP 2000514506 A 20001031; JP 4369536 B2 20091125; KR 20000016310 A 20000325; PL 183750 B1 20020731; PL 331166 A1 19990621; RU 2190025 C2 20020927; SK 1899 A3 20000214; SK 283881 B6 20040406; TW 425429 B 20010311; US 6153019 A 20001128; WO 9802591 A1 19980122; ZA 9706001 B 19980901

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