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Oriented electrical steel sheets and method for manufacturing the same

A technology of grain-oriented electrical steel sheet and manufacturing method, applied in the field of grain-oriented electrical steel sheet and its manufacturing, can solve the problems of complicated manufacturing process and rising cost, and achieve the effects of reducing manufacturing cost, reducing manufacturing cost and excellent iron loss characteristics

Inactive Publication Date: 2015-06-24
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, the production method of grain-oriented electrical steel sheets using AlN or MnS precipitates as grain growth inhibitors to cause secondary recrystallization also has the following problem: after the completion of secondary recrystallization, in order to remove the precipitate components, it is necessary to Purification annealing at high temperature for more than 30 hours leads to complicated manufacturing process and increased cost
[0008] Although there is a method for manufacturing grain-oriented electrical steel sheets, AlN and MnS precipitates are not used as grain growth inhibitors, but surface energy is used as the crystal growth driving force to preferentially grow {110}-oriented grains, but In order to effectively use the difference in surface energy, the thickness of the steel plate must be thin

Method used

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  • Oriented electrical steel sheets and method for manufacturing the same
  • Oriented electrical steel sheets and method for manufacturing the same
  • Oriented electrical steel sheets and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0081] The slabs containing 0.05% C, 3.2% Si, 0.03% Mn, 0.003% Al, 0.003% N as basic components, and adding different contents of S, Sn, Sb, and Bi were vacuum melted into ingots.

[0082] Next, the ingot was heated at a temperature of 1250° C., and then hot-rolled to a thickness of 2.3 mm. After the hot-rolled hot-rolled sheet was heated to a temperature of 950° C., soaking was performed for 180 seconds, and then the hot-rolled sheet was annealed.

[0083] After pickling the steel plate annealed by the hot-rolled plate, it is cold-rolled into a cold-rolled plate with a thickness of 0.30 mm. The cold-rolled steel sheet was held at a temperature of 810° C. for 180 seconds in a moist hydrogen-nitrogen mixed gas atmosphere to perform decarburization and recrystallization heat treatment.

[0084] After coating the annealing separator MgO on the steel sheet, final annealing was performed in a coiled state. The final annealing was carried out in a mixed atmosphere of 25% by volum...

Embodiment 3

[0092] The slab contains 0.045% of C, 3.15% of Si, 0.020% of Mn, 0.020% of S, 0.05% of Sn, 0.03% of Sb, 0.015% of Bi in % by weight as a basic component, and the following table Al and N contents were varied as shown in 3, and the slab was vacuum melted into ingots.

[0093] Next, after heating the ingot at a temperature of 1200° C., it was hot-rolled to a thickness of 2.3 mm. Heat the hot-rolled sheet after hot rolling to 1100° C., then heat soak at a temperature of 900° C. for 120 seconds, and then anneal the hot-rolled sheet.

[0094] Thereafter, the steel sheet annealed by the hot-rolled sheet was cooled, pickled, and cold-rolled into a cold-rolled sheet having a thickness of 0.23 mm. The cold-rolled steel sheet is kept at 850° C. for 180 seconds in a moist hydrogen-nitrogen mixed gas atmosphere to perform decarburization and recrystallization heat treatment.

[0095] After coating the annealing separator MgO on the steel sheet produced in this way, final annealing was p...

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Abstract

An oriented electrical steel sheet according to one embodiment comprises, by weight, 2.0-4.5% of Si, 0.001-0.20% of C, less than 3% (not including 0%) of Al, less than 0.08% (not including 0%) of Mn, less than 0.005% (not including 0%) of N and less that 0.05% (not including 0%) of S, and the remainder is Fe and other unavoidable impurities.

Description

technical field [0001] The invention relates to a oriented electrical steel plate and a manufacturing method thereof. Background technique [0002] Grain-oriented electrical steel sheet is a soft magnetic material with excellent magnetic properties in the rolling direction of the steel sheet, because the grain-oriented electrical steel sheet forms a so-called Gaussian texture, in which all grains on the steel sheet surface are oriented to the {110} plane, and during rolling The crystal orientation in the direction is parallel to the <001> axis. Research on the technology of manufacturing grain-oriented electrical steel sheets by secondary recrystallization with orientation {110}<001> is mainly focused on the use of strong grain growth inhibitors to form secondary recrystallization with high concentration of {110}<001> orientation. Crystallized to ensure excellent magnetic properties. [0003] The manufacturing method of grain-oriented electrical steel she...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/06C21D8/12
Inventor 韩奎锡林才洙高炫昔
Owner POHANG IRON & STEEL CO LTD
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