Method for manufacturing grain-oriented electrical steel sheet
A technology of grain-oriented electrical steel sheet and manufacturing method, which is applied to manufacturing tools, furnace types, furnaces, etc., can solve the problems of low oxidation ability, difference in formation of undercoating, and inability to commercialize, and achieve the effect of improving iron loss
Active Publication Date: 2018-08-31
浦项股份有限公司
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Problems solved by technology
[0010] In addition, the existing method of controlling the oxidation ability to be extremely low and minimizing the formation of the undercoat layer by minimizing the oxide layer, in the case of heat treatment from the top of the coil during high temperature annealing, according to the temperature in the coil during high temperature annealing The position of the plate has different dew point and temperature behavior, and the formation of the undercoat layer at this time is different, and the glass free degree is different, which produces deviations according to the position of the plate, which is very problematic for mass production.
[0011] Therefore, in order to manufacture low iron loss grain-oriented electrical steel sheets by the current glass-free method, a decrease in productivity in the decarburization process and high-temperature annealing is inevitable, so although the glass-free process is technically very useful, it cannot be commercialized in reality
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[0141] Manufacture a slab containing Si: 3.2%, Sn: 0.06%, Sb: 0.025% by weight %, then hot-roll it to make a 2.6 mm hot-rolled sheet, then implement annealing and pickling of the hot-rolled sheet, and then cold-roll it into The final thickness is 0.30mm.
[0142] Next, primary recrystallization annealing was performed on the cold-rolled steel sheet, and decarburization and nitriding treatments were carried out while maintaining at a soaking temperature of 875° C. for 180 seconds. At this time, as shown in Table 1 below, the dew point (Dew point) of the heating section, the first soaking section and the second soaking section is adjusted to adjust the amount of the generated oxide layer.
[0143] The field emission transmission electron microscope (FE-EPMA) pictures and analysis results of the side of the cold-rolled plate after a recrystallization annealing are shown in Figure 4 middle. Such as Figure 4 As shown, it was confirmed that the base metal layer, the segregation...
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Abstract
A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: preparing a steel slab comprising, by weight, at least one of 2 to 7% of Si, 0.03 to 0.10% of Sn, and 0.01 to 0.05% of Sb; hot rolling the steel slab to prepare a hot-rolled plate; cold rolling the hot-rolled plate to prepare a cold-rolled plate; primary recrystallization annealing the cold-rolled plate to conduct decarburization and nitridation; coating the primary recrystallization-annealed cold-rolled plate with an annealing separator, followed by drying; and secondary recrystallization annealing the annealing separator-coated cold-rolled plate.
Description
technical field [0001] The invention relates to a method for manufacturing a grain-oriented electrical steel sheet. Background technique [0002] Grain-oriented electrical steel sheet contains 3.1% Si and has a texture in which grain orientations are aligned along the (110)[001] direction. Grain-oriented electrical steel sheets have extremely excellent magnetic properties along the rolling direction, so they are used as core materials for transformers, motors, generators, and other electronic equipment. [0003] Recently, with the commercialization of grain-oriented electrical steel sheets with high magnetic flux density grades, it is required to produce materials with less iron loss. To this end, the following four technical methods can be adopted: i) Orienting the {110}<001> grain orientation containing the easy magnetic axis of the grain-oriented electrical steel sheet precisely along the rolling direction; ii) Thinning the material; iii) Through chemical, Physica...
Claims
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IPC IPC(8): C21D8/12C22C38/02
CPCC21D8/12C22C38/02C21D9/46C22C38/001C22C38/002C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60C21D8/1222C21D8/1233C21D8/1255C21D8/1272C21D8/1283C22C38/008
Inventor 朴昶洙韩敏洙朴钟皓朱炯暾金润水
Owner 浦项股份有限公司