Oriented electrical steel sheet and method for manufacturing same
A technology of oriented electrical steel sheet and manufacturing method, which is applied in the direction of circuits, electrical components, magnetic materials, etc., can solve the problems of inability to apply the same heat treatment mode, grain growth limitation, iron loss improvement limitation, etc., and shorten the purification annealing time , excellent magnetic properties, and the effect of improving productivity
Pending Publication Date: 2021-07-23
POSCO
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Problems solved by technology
[0005] First, due to the temperature deviation between the outer and inner coils caused by the heat treatment in the coil state, the same heat treatment mode cannot be applied to each part, resulting in magnetic deviations between the outer and inner coils
Second, after decarburization annealing, various surface defects are generated during the process of coating MgO on the surface for high-temperature annealing to form the base coating (Base coating), so the yield will decrease
Third, the decarburized sheet after decarburization annealing is rolled into a coil form, then high-temperature annealed, and then planarized annealed for insulation coating, so the production is divided into three steps, resulting in a problem of decreased yield
However, in the case of continuous annealing, due to the short-time heat treatment of several minutes, the grain growth of the final grain is limited, and grains with an optimal grain size cannot be grown, and there is a limit in iron loss improvement
Method used
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Embodiment 1
[0086]In % by weight, the slab contains Si: 2.32%, C: 0.195%, and the balance contains Fe and unavoidable impurities. The slab is heated at a temperature of 1250° C., then hot-rolled, and then heated at 950° C. The annealing temperature of the hot-rolled sheet is annealed at a dew point temperature of 60°C. Thereafter, the steel sheet was cooled, pickled, and cold-rolled at a rolling reduction of 65% to produce a cold-rolled sheet having a thickness of 0.8 mm.
[0087] The cold-rolled sheet was subjected to decarburization annealing for 80 seconds at a temperature of 950°C and a moist mixed gas environment of hydrogen and nitrogen (the dew point temperature was 60°C), and then cold-rolled at a reduction rate of 65% to produce a thickness of 0.28mm cold rolled sheet.
[0088] Then, when the final annealing was performed, after decarburization annealing was performed at a temperature of 950°C and a humid mixed gas atmosphere of hydrogen and nitrogen (dew point temperature of 60...
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A method for manufacturing an oriented electrical steel sheet, according to one embodiment of the present invention, comprises: a step for heating a slab; a step for hot rolling the slab to manufacture a hot rolled steel sheet; a step for hot rolled sheet annealing the hot rolled steel sheet; a step for primary cold rolling the hot rolled sheet annealed hot rolled steel sheet; a step for decarburization annealing the primary cold rolled steel sheet; a step for secondary cold rolling the steel sheet with the decarburization annealing completed; a step for continuously annealing the steel sheet with the secondary cold rolling completed; and a step for batch annealing the continuously annealed steel sheet.
Description
technical field [0001] The invention relates to a oriented electrical steel plate and a manufacturing method thereof. In particular, the present invention relates to a grain oriented electrical steel sheet whose magnetic properties are improved by including multiple cold rolling and decarburization annealing processes and a manufacturing method thereof. Background technique [0002] The grain-oriented electrical steel sheet is a soft magnetic material excellent in magnetic properties in the rolling direction composed of crystal grains having a so-called Goss (Goss) orientation in which the crystal orientation of the steel sheet is {110}<001>. [0003] For such oriented electrical steel sheets, after the slab is heated, it is made into the final thickness by hot rolling, hot-rolled sheet annealing, and cold rolling, and then undergoes recrystallization annealing and high-temperature annealing for secondary recrystallization to form orientation. Electrical steel plate. ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C38/02C22C38/04C21D8/12H01F1/147
CPCC22C38/04C22C38/02C21D8/12H01F1/147Y02P10/20C21D8/1222C21D8/1244C21D8/1233H01F1/14766C22C2202/02
Inventor 高炫昔徐进旭
Owner POSCO