Oriented electrical steel sheet and method for preparing same
Pending Publication Date: 2021-03-04
POHANG IRON & STEEL CO LTD
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Benefits of technology
The present invention relates to a method of producing an oriented electrical steel sheet with excellent magnetic properties. The method involves controlling the alloy component and growing grains with high degree of integration into a Goss orientation during secondary recrystallization high temperature annealing using S- and Se-based precipitates. A cold rolled sheet is prepared by cold rolling the hot rolled sheet and warm rolling is performed to maintain the temperature of the sheet at 100°C or higher. The technical effects achieved by this method include improved magnetic properties and stable growing grains with high degree of integration into a Goss orientation.
Problems solved by technology
In addition, when the slab is heated at a high temperature, a slab washing phenomenon occurs due to formation of Fe2SiO4 having a low melting point, thereby decreasing actual yields.
The low temperature heating method also has many limitations in the preparing process so as to control precipitates, and thus does not solve problems caused by complexity in the preparing process.
Method used
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examples
[0069]A slab including Si at 3.2 wt %, C at 0.055 wt %, and the contents of Mn, Cu, S, Se, Al, and N that were changed as shown in Table 1, and a remainder Fe and inevitable impurities was prepared. Subsequently, the slab was heated to 1250° C. and then hot rolled to prepare a 2.3 mm thick hot rolled sheet. The hot rolled sheet was heated at a temperature of 1085° C., then maintained at 910° C. for 160 seconds and quenched in water. Next, after pickling the hot-rolled annealing sheet, it was cold-rolled to a thickness of 0.30 mm, and the primary recrystallization annealing was performed for the cold-rolled steel sheet by maintaining it at a temperature of 850° C. for 180 seconds in a mixed gas atmosphere of hydrogen and nitrogen at a dew point of 60° C. After applying MgO, which is an annealing separator, to this steel sheet, the secondary recrystallization annealing was performed therefor, wherein the secondary recrystallization annealing was performed in a mixed gas atmosphere of ...
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Abstract
An oriented electrical steel sheet according to an embodiment of the present invention includes, in a unit of wt %, Si at 1.0 wt % to 5.0 wt %, C at 0.005 wt % or less (excluding 0 wt %), Mn at 0.001 wt % to 0.1 wt %, Cu at 0.001 wt % to 0.1 wt %, S at 0.001 wt % to 0.020 wt %, Se at 0.001 wt % to 0.050 wt %, Al at 0.0005 wt % to 0.010 wt %, N at 0.0005 wt % to 0.005 wt %, and the remainder of Fe and inevitable impurities.The oriented electrical steel sheet according to the embodiment of the present invention satisfies Equation 1.16≤(10×[Mn]+[Cu]) / ([S]+[Se])+(0.02−[Al]) / [N]≤20 [Equation 1](In Equation 1, [Mn], [Cu], [S], [Se], [Al], and [N] represent contents (wt %) of Mn, Cu, S, Se, Al, and N, respectively.)
Description
TECHNICAL FIELDBACKGROUND ART(a) Field of the Invention[0001]The present invention relates to an oriented electrical steel sheet and a method for preparing the oriented electrical steel sheet. Specifically, the present invention relates to an oriented electrical steel sheet and a method for preparing the oriented electrical steel sheet that may be excellent in magnetism by stably growing grains with a very high degree of integration into a Goss orientation during secondary recrystallization high temperature annealing using S- and Se-based precipitates. More specifically, the present invention relates to an oriented electrical steel sheet and a method for preparing the oriented electrical steel sheet that may have excellent magnetic properties by controlling a correlation between Mn, Cu, S, Se, Al, and N in an alloy component.(b) Description of the Related Art[0002]An oriented electrical steel sheet is a soft magnetic material used as an iron core for electronic equipment that has ex...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C38/16C22C38/04C22C38/02C22C38/06C22C38/00C21D8/02C21D9/00
CPCC22C38/16C22C38/04C22C38/02C22C38/06C21D9/0081C22C38/002C21D8/0226C21D8/0236C21D8/0205C22C38/001C21D8/12C21D9/46C22C38/00C22C38/60C22C38/004C21D8/1244C21D8/1272C21D8/1205C21D6/008C21D6/00Y02P10/20C21D8/1222C21D8/1233C21D2201/05
InventorKIM, JAE KYOUMHAN, KYU-SEOKPARK, CHANG SOOSEO, JIN-WOOKPARK, YUJUN
OwnerPOHANG IRON & STEEL CO LTD