Annealing separating agent for grain oriented electrical steel sheet having uniform glass film and excellent magnetic properties and method of manufacturig the same

A technology of annealing separator and grain orientation, which is applied in solid-state chemical plating, coating, metal material coating process, etc. Satisfaction and other issues, to achieve excellent synergistic effect, inhibit other oxidation or nitrification, inhibit the effect of reaction

Active Publication Date: 2009-09-09
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] In the improvement technology regarding MgO or additives, there is a problem that the glass coating film cannot be stably formed depending on the composition of the steel sheet, decarburization annealing conditions or final annealing conditions, especially for large coils where temperature changes may occur. Form a uniform glass film
Also, the above techniques are not designed to solve the coil shape problem and are therefore still unsatisfactory

Method used

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  • Annealing separating agent for grain oriented electrical steel sheet having uniform glass film and excellent magnetic properties and method of manufacturig the same
  • Annealing separating agent for grain oriented electrical steel sheet having uniform glass film and excellent magnetic properties and method of manufacturig the same
  • Annealing separating agent for grain oriented electrical steel sheet having uniform glass film and excellent magnetic properties and method of manufacturig the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Orienting grains with high magnetic flux density containing 0.0078% C, 3.18% Si, 0.068% Mn, 0.024% S, 0.028% Al, 0.0080% N by weight %, and the balance being Fe and other unavoidable impurities The electromagnetic steel sheet material was hot-rolled, annealed and cold-rolled to obtain a final thickness of 0.30 mm. Then, the cold-rolled steel plate is put on the continuous annealing line in N 2 50%+H 2 Decarburization annealing was performed at 850° C. for 150 seconds in an atmosphere of 50% (63° C. DP). At this time, the oxygen content in the steel sheet was 750 ppm. Then, an alkaline composition was added by adding 5 parts by weight of TiO to 100 parts by weight of 40% MgO with a CAA value of 65 seconds 2 Obtained - and the slurry of the low-boiling point additive shown in the following table 1 is 6.5g (by dry weight) / m 2 The ratio of the surface of the steel plate is applied to the steel plate and allowed to dry. The resulting steel sheet was wound into a coil. ...

Embodiment 2

[0063] Hot-rolled and annealed grain-oriented electrical steel sheet material with high magnetic flux density containing 0.0060%C, 3.20%Si, 0.070%Mn, 0.029%Al by weight%, and the balance being Fe and other unavoidable impurities and cold rolling to obtain a final thickness of 0.23mm. Then, on the continuous annealing line at N 2 50%+H 2 Decarburization annealing was performed at 850°C for 130 seconds in an atmosphere of 50% (DP 62°C). Here, the oxygen content in the steel sheet was 730 ppm. Then, an alkaline composition was added by adding 5 parts by weight of TiO to 100 parts by weight of MgO with different 40% CAA values 2 Obtained - and the slurry of the low-melting point additive shown in the following table 2 is 6.0g (by dry weight) / m 2 The ratio of the surface of the steel plate is applied to the steel plate and allowed to dry. The resulting steel sheet was wound into a coil.

[0064] Then, according to the same method as in Example 1, the coil was subjected to a f...

Embodiment 3

[0076] The same raw material as used in Example 2 was rolled to a final thickness of 0.23 mm and subjected to decarburization annealing under the same conditions. The steel coil was then coated with an annealing release agent having the composition shown in Table 4 below and containing TiO 2 , V 2 o 5 , Nb 2 o 4 and / or MnO 2 Used as an additive to adjust the atmosphere between the steel plate surfaces. Then, the steel sheet coil was subjected to final annealing and insulation coating under the same conditions as in Examples 1 and 2, and its glass coating performance and magnetic performance were evaluated. Table 4 below shows the results obtained in this example.

[0077] 【Table 4】

[0078]

[0079]

[0080] As can be seen from the above table 4, in the present invention 32-39, 3-10 parts by weight are selected from TiO 2 , V 2 o 5 , Nb 2 o 4 and MnO 2 When one or more of them are added together with low melting point additives, good glass coating properties...

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Abstract

Disclosed herein are an annealing separator for grain-oriented electrical steel sheets having excellent surface properties and a method for producing grain-oriented electrical steel sheets using the same. More particularly, the annealing separator comprises: 100 parts by weight of MgO, consisting of 40-95% of active MgO and 5-60% of inactive MgO; and 0.01-5 parts by weight of a low-melting-point compound having a melting point lower than 900 DEG C. The method for producing grain-oriented steel sheets comprises applying said annealing separator in the form of slurry to a steel sheet, after stirring the annealing separator in a mixing tank at a revolution speed of 1500-3000 rpm for more than 10 minutes.

Description

technical field [0001] The present invention relates to an annealing release agent for a grain-oriented electrical steel sheet with excellent surface properties and a method for manufacturing a grain-oriented electrical steel sheet using the annealing release agent, more specifically, to such a grain-oriented electrical steel sheet with excellent surface properties An annealing separator for electrical steel sheets, the annealing separator contains 100 parts by weight of MgO composed of 40-95% active MgO and 5-60% inactive MgO, and 0.01-0.5 parts by weight of a low melting point compound with a melting point lower than 900°C It also relates to a method for preparing a grain-oriented electrical steel sheet, which method comprises stirring the annealing separator in a mixing tank (mixing tank) at a speed of 1500-3000 rpm for more than 10 minutes, and then mixing the annealing agent in the form of slurry A release agent is applied to the steel plate. Background technique [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0278C23C20/04C23C20/08
Inventor 朴钟皓禹宗秀朴圣权
Owner 浦项股份有限公司
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