EP 2644715 B1 20180425 - MANUFACTURE METHOD OF ORIENTED SILICON STEEL HAVING GOOD MAGNETIC PERFORMANCE
Title (en)
MANUFACTURE METHOD OF ORIENTED SILICON STEEL HAVING GOOD MAGNETIC PERFORMANCE
Title (de)
HERSTELLUNGSVERFAHREN FÜR EINEN KORNORIENTIERTEN SILIZIUMSTAHL MIT HOHER MAGNETKRAFT
Title (fr)
PROCÉDÉ DE PRODUCTION D'ACIER AU SILICIUM À GRAINS ORIENTÉS PRÉSENTANT DE BONNES PERFORMANCES MAGNÉTIQUES
Publication
Application
Priority
- CN 201010561051 A 20101126
- CN 2011073419 W 20110428
Abstract (en)
[origin: EP2644715A1] A method for manufacturing a grain-oriented silicon steel having excellent magnetic performance, comprising steps as follows 1) conventionally melting and casting into a steel blank; 2) heating the steel blank and hot rolling the same into a strip of steel; 3)normalizing process; carrying out the normalizing process having two stages, wherein the strip is firstly heated to 1100ˆ¼1200°C, then cooled to 900ˆ¼1000 °C within 50-200s; and next, the strip is rapidly cooled in water having a temperature of 10ˆ¼100; in this period, a tension force is applied to the strip of steel, the strip of steel in the temperature range of 900°Cˆ¼500°C has a stress of 1ˆ¼200N/mm 2 ; 4)cold rolling, i.e. carrying out a primary cold rolling, or a double cold rolling with intermediate annealing; 5)carrying out primary recrystallizing annealing, then coating an annealing separator, whose main composition is MgO, to carry out final product annealing comprising secondary recrystallizing annealing and purifying annealing. The invention optimizes the content and distribution of martensite in the steel plate after normalization by adjusting the tension force applied to the steel plate while normalization transformation, so as to make the content of martensite in the range ensuring a better magnetic performance of the final product and to optimize the magnetic performance of final products.
IPC 8 full level
C21D 8/12 (2006.01); B21B 37/48 (2006.01)
CPC (source: EP KR)
B21B 37/48 (2013.01 - KR); C21D 8/12 (2013.01 - EP KR); C21D 8/1244 (2013.01 - EP); C21D 8/1272 (2013.01 - EP); C21D 8/1277 (2013.01 - EP); C21D 8/1283 (2013.01 - EP); C21D 2201/05 (2013.01 - EP); C21D 2211/008 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2644715 A1 20131002; EP 2644715 A4 20161214; EP 2644715 B1 20180425; CN 102477483 A 20120530; CN 102477483 B 20131030; JP 2013544970 A 20131219; JP 5845275 B2 20160120; KR 101512090 B1 20150414; KR 20130101099 A 20130912; MX 2013005869 A 20130715; MX 351880 B 20171101; RU 2013127584 A 20150110; RU 2552792 C2 20150610; WO 2012068830 A1 20120531
DOCDB simple family (application)
EP 11842864 A 20110428; CN 201010561051 A 20101126; CN 2011073419 W 20110428; JP 2013538037 A 20110428; KR 20137013154 A 20110428; MX 2013005869 A 20110428; RU 2013127584 A 20110428