EP 1752549 B1 20160120 - Process for manufacturing grain-oriented magnetic steel spring
Title (en)
Process for manufacturing grain-oriented magnetic steel spring
Title (de)
Verfahren zur Herstellung von kornorientiertem Elektroband
Title (fr)
Procédé de fabrication de bande d'acier magnétique à grains orientés
Publication
Application
Priority
EP 05016835 A 20050803
Abstract (en)
[origin: EP1752549A1] A method for the production of grain-oriented electric steel strip by continuous thin-slab casting, involves a continuous hot-rolling stage on a line-mounted multiple-stand milling train at 900-1200[deg]C, with reductions of more than 40% in the first pass and not more than 30% in the last pass and with rolling in the two-phase mixture range in at least the second and third passes.. A method for the production of grain-oriented electric steel strip based on a continuous thin-slab casting process, involves (a) melting steel containing (apart from iron and unavoidable impurities) 2.5-4.0 wt% silicon, 0.02-0.10 wt% carbon, 0.01-0.065 wt% aluminum, 0.003-0.015 wt% nitrogen, and optionally up to 0.30 wt% manganese, up to 0.05 wt% titanium, up to 0.3 wt% phosphorus, not more than 0.04 wt% sulfur and/or selenium (total), up to 0.2 wt% (each) of one or more of the elements arsenic, tin, antimony, tellurium or bismuth, up to 0.5 wt% (each) of one or more of the elements copper, nickel, chromium, cobalt or molybdenum and up to 0.012 wt% (each) of one or more of the elements boron, vanadium or niobium, (b) secondary metallurgical processing of the melt in a vacuum unit and/or a pan furnace, (c) continuous casting to form a strip, (d) cutting the strip into thin slabs, (e) heating to 1050-1300[deg]C for not more than 60 minutes in an in-line furnace, (f) continuous hot-rolling in a line-mounted multiple stand mill train to give rolled strip with a thickness of 0.5-4.0 mm, using a temperature of 900-1200[deg]C for the first pass with a reduction of more than 40%, rolling in the two-phase mixture range (alpha - gamma ) in at least the next two passes and with a reduction of not more than 30% in the last pass, (g) cooling the strip, (h) rolling the strip into a coil, (i) optionally annealing the strip after coiling or before cold-rolling, (j) cold-rolling to cold-rolled strip with a final thickness of 0.15-0.50 mm, (k) annealing with recrystallisation and decarbonisation, (l) treating the strip surface with a scale separator, (m) final annealing to develop a Goss structure, (n) optional coating with electrical insulation followed by stress-relieving annealing and (o) optional domain refinement.
IPC 8 full level
C21D 8/12 (2006.01); C22C 38/02 (2006.01)
CPC (source: EP KR US)
C21D 8/12 (2013.01 - KR); C21D 8/1222 (2013.01 - EP US); C21D 8/1244 (2013.01 - EP US); C21D 8/1261 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US)
Citation (examination)
- "I materiali magnetici impiegati nelle macchine electriche: proprietà dei prodotti attuali e tendenze di sviluppo", LA METALLURGICA ITALIANA, 19 September 1991 (1991-09-19), IT, pages 905 - 914
- "Grain-oriented Silicon Electrical Steel From Italy and Japan", US INTERNATIONAL TRADE COMMISSION, 1 May 1994 (1994-05-01), us, pages ii-3 - ii-8
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1752549 A1 20070214; EP 1752549 B1 20160120; AU 2006274901 A1 20070208; AU 2006274901 B2 20110728; BR PI0614379 A2 20110322; BR PI0614379 B1 20140429; CA 2615586 A1 20070208; CA 2615586 C 20150421; CN 101238227 A 20080806; CN 101238227 B 20111116; JP 2009503265 A 20090129; KR 101365653 B1 20140219; KR 20080042859 A 20080515; MX 2008001475 A 20080402; PL 1752549 T3 20170831; RU 2008107938 A 20090910; RU 2407807 C2 20101227; SI 1752549 T1 20160930; TW 200710226 A 20070316; TW I402353 B 20130721; US 2008216985 A1 20080911; US 8088229 B2 20120103; WO 2007014868 A1 20070208; ZA 200800663 B 20090429
DOCDB simple family (application)
EP 05016835 A 20050803; AU 2006274901 A 20060720; BR PI0614379 A 20060720; CA 2615586 A 20060720; CN 200680028800 A 20060720; EP 2006064480 W 20060720; JP 2008524481 A 20060720; KR 20087005312 A 20060720; MX 2008001475 A 20060720; PL 05016835 T 20050803; RU 2008107938 A 20060720; SI 200532056 A 20050803; TW 95127715 A 20060728; US 99767006 A 20060720; ZA 200800663 A 20080122