KR101633249B1 - Non-oriented electrical steel sheet and manufacturing method for the same - Google Patents

Abstract

The present invention relates to a non-oriented electrical steel sheet and a method of manufacturing the same. The steel sheet comprises 1.5 to 3.5% of Si, 0.15 to 0.45% of Al, 0.61 to 1.12% of Mn, 0.026 to 0.049% of P, 0.005% or less (excluding 0%) of N, 0.005% or less (excluding 0%) of S, 0.001 to 0.005% of S and 0.005% or less of Ti (excluding 0%) and the balance consisting of Fe and other inevitably added impurities Wherein the Mn, Al and P satisfy 2 * ([Al] + [P]) / [Mn] 1 and 10 * [P] / [Al] Here, [Al], [P] and [Mn] are the weight percentages of Al, P and Mn added, respectively.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-oriented electrical steel sheet,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-oriented electrical steel sheet and a manufacturing method thereof, and more particularly, to a non-oriented electrical steel sheet having improved magnetic properties by controlling the content of manganese, aluminum and phosphorus while reducing the content of aluminum.

The nonoriented electric steel sheet plays an important role in determining the energy efficiency of the electric equipment because the nonoriented electric steel sheet is used as an iron core material in a rotating device such as a motor and a generator and a stationary device such as a small transformer, Because it plays a role of turning it into energy.

In the case of nonoriented electrical steel sheets, a method of adding alloying elements such as Si, Al, and Mn with high resistivity is generally used to improve iron loss. Among them, Si and Al are elements that greatly increase the resistivity, and Mn has a smaller specific resistance increase and can reduce the magnetic flux density.

The core loss can be divided into the hysteresis loss and the eddy loss. When the frequency increases, the hysteresis loss is almost similar but the eddy loss is greatly increased. Since the eddy loss is greatly influenced by the addition amount of the resistivity element, The addition amount of the non-resistive element such as Al should be increased. However, when a large amount of alloying elements such as Si and Al is added in a large amount, the iron loss is reduced, but the reduction of the magnetic flux density is also inevitable due to the decrease of the saturation magnetic flux density.

Recently, the magnetic flux density in the high field region and the low field region is also very important. In order to lower the iron loss, the magnetic flux density in the high magnetic field region and the low field region is decreased when the amount of the alloying element such as Si and Al is increased The problem of increasing the magnetic flux density while lowering the iron loss at the high frequency is considered to be a difficult part.

In this regard, among the prior arts for the non-oriented electrical steel sheet, Japanese Patent Publication No. 2012-112015, Japanese Patent Application Laid-Open No. 2011-179027, Japanese Patent Application Laid-Open No. 2006-104557, Japanese Patent Application Laid-Open No. 55-158252, Japanese Laid-Open Patent Application No. 62-180014, -100217 and Korean Patent Laid-Open Publication No. 1997-0043173 have attempted to solve these problems, but there have been problems such as lowering of productivity, lowering of magnetism, and increase of cost.

In order to solve the above-mentioned problems, the present invention reduces the amount of Al added and the amount of Mn added in steel alloying elements to lower the iron loss at high frequencies, and controls the addition amount of P to improve the texture, Oriented electric steel sheet having improved magnetic properties and a method of manufacturing the same.

In one or more embodiments of the present invention, it is preferable that the steel sheet contains 1.5 to 3.5% of Si, 0.15 to 0.45% of Al, 0.61 to 1.12% of Mn, 0.026 to 0.049% of P, 0.005% or less (excluding 0%), S: 0.001 to 0.005%, and Ti: 0.005% or less (excluding 0%), the balance being Fe and other inevitably added impurities, Al and P can be provided with a non-oriented electrical steel sheet satisfying the composition formula 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] Here, [Al], [P] and [Mn] are the weight percentages of Al, P and Mn added, respectively.

Further, it may further contain 0.01 to 0.2% by weight of Sn + Sb, 0.05% by weight or less of Cu, Ni and Cr, respectively, and may contain Zr, Mo and V in an amount of 0.01% have.

Texture of the steel sheet is _{0.35≤ (V c + V g +} V rc) / V {111} may satisfy a ≤0.45, _c in the V, V _g, V _rc is 100 [001] (110 ) [001], (100) [011] is the volume fraction of the texture, and V _{111} is the volume fraction of the texture of the {111} texture.

The grain size of the steel sheet may be in the range of 50 to 150 _{占 퐉} and the iron loss (W _10/400 ) of the steel sheet may be ₁₇ W / Kg or less and the magnetic flux density (B ₁ ) may be 1 tesla or more.

In one or more embodiments of the present invention, it is preferable that the steel sheet contains 1.5 to 3.5% of Si, 0.15 to 0.45% of Al, 0.61 to 1.12% of Mn, 0.026 to 0.049% of P, 0.005% or less (excluding 0%), S: 0.001 to 0.005% and Ti: 0.005% or less (excluding 0%), the balance being Fe and other inevitably added impurities, Al and P are reheated to 1200 ° C or less at a slab satisfying a composition formula of 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] Hot rolling the reheated slab; Annealing the hot-rolled hot-rolled sheet by hot rolling or omitting the hot-rolled sheet and cold rolling; And finally annealing the cold-rolled cold-rolled sheet at a temperature of 850 to 1100 占 폚. Here, [Al], [P] and [Mn] are the weight percentages of Al, P and Mn added, respectively.

In this case, Sn + Sb may be further added in an amount of 0.01 to 0.2% by weight, Cu, Ni and Cr may each be contained in an amount of 0.05% by weight or less, and Zr, Mo and V may be contained in an amount of 0.01%

The hot-rolled sheet annealing may be performed at a temperature ranging from 850 to 1150 ° C.

The cold rolling may be two or more cold rolling with primary cold rolling or intermediate annealing in between.

According to the embodiment of the present invention, the addition amount of Mn is increased and the addition amount of P is precisely controlled to improve the aggregate structure in order to limit the addition amount of Al and to compensate the resistivity, It is possible to produce a non-oriented electrical steel sheet having a high magnetic flux density and excellent magnetic properties.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

The non-oriented electrical steel sheet according to an embodiment of the present invention was made by adding Si, Al, Mn and P to improve the iron loss by decreasing the amount of Al added and increasing the amount of Mn in the component system of the conventional non- (100) [001], (110) [001], and (100) [011], which are favorable to magnetism, by enhancing the aggregate structure by appropriately controlling the addition amount of P, And to improve the magnetism in the high frequency and autogenous field by reducing the tissue.

For this purpose, in one embodiment of the present invention, it is preferable that Si is contained in an amount of 1.5 to 3.5%, Al is 0.15 to 0.45%, Mn is 0.61 to 1.12%, P is 0.026 to 0.049%, C is 0.005% ), N: not more than 0.005% (excluding 0%), S: 0.001 to 0.005%, Ti: not more than 0.005% (excluding 0%), the balance Fe and other inevitably added impurities, P is a non-oriented electrical steel sheet having excellent magnetic properties in a high-frequency and author-length region satisfying a composition formula of 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] to provide. Here, [Al], [P] and [Mn] mean the weight percent of Al, P and Mn added, respectively.

(100) [001], (110) [001], and (100) which are favorable to magnetism in the texture of the steel sheet are obtained by adding Sn + Sb in an amount of 0.01 to 0.2% When the fractions of the texture are denoted as V _c , V _g and V _rc and the fractions of the _{111} texture unfavorable to magnetism are denoted as V _{111} , 0.35? (V _c + V _g + V _rc ) / V _{111}? 0.45, the iron loss W _10/400 was ₁₇ W / Kg or less and the magnetic flux density B ₁ was ₁ T or more.

In an embodiment of the present invention, the average grain size of the steel sheet is 50 to 150 mu m.

In one embodiment of the present invention, the main elements added to prepare the non-oriented electrical steel sheet are Si, Mn, Al, P, Sn and Sb. The most common way to lower the iron loss is to increase the resistivity of the steel. Si and Al are the elements that increase the resistivity most significantly. If the addition amount of Si is increased to lower the iron loss, the cold rolling property is deteriorated.

Mn is an element capable of increasing the resistivity, but Mn is conventionally added at less than 0.5% because it is a non-magnetic element that can lower the saturation magnetic flux density and is less effective than Si and Al. On the other hand, P is well known as a grain boundary grain boundary and segregates at grain boundaries during recrystallization to inhibit aggregate formation unfavorable to magnetism in grain boundaries. However, when the amount of P added is excessive, it is difficult to obtain desired crystal grains because crystal growth is inhibited, so it is important to properly add P.

Hereinafter, the reason for limiting the numerical value in the production of the non-oriented electrical steel sheet according to one embodiment of the present invention will be described.

Si: 1.5 to 3.5 wt%

Since Si is a component that increases the resistivity of steel and lowers vortex loss during iron loss, Si is a main element to be added. When the Si content is less than 1.5%, a high magnetic flux density characteristic can be obtained. However, it is difficult to obtain a low iron loss property. The sheet breakage occurs in the cold rolling. Therefore, in one embodiment of the present invention, the addition amount of Si is limited to 1.5 to 3.5% by weight.

Mn: 0.61 to 1.12 wt%

In addition to Si and Al, the Mn has an effect of lowering the iron loss by increasing the resistivity. However, Mn is added for the purpose of improving the iron loss by adding about 0.1 to 0.5% in the conventional nonoriented electric steel sheet to decrease the magnetic flux density as it is added. In one embodiment of the present invention, the Mn addition amount is limited to 0.61 to 1.12% by weight in one embodiment of the present invention because the amount of Al added can be decreased by increasing the amount of Mn and improving the magnetic flux density by improving the texture.

Al: 0.15-0.45 wt%

Since Al is a main element for increasing the resistivity, it is added in order to lower the iron loss, but also serves to decrease the saturation magnetic flux density when added in a large amount. If the Al addition amount is less than 0.15%, the AlN is formed to form fine AlN, thereby suppressing the grain growth and decreasing the magnetic property. If the Al addition amount is more than 0.45%, the magnetic flux density is decreased. Therefore, The addition amount of Al is limited to 0.15 to 0.45% by weight.

P: 0.026 to 0.049 wt%

The P decreases the iron loss by lowering the resistivity and segregates in the grain boundaries to inhibit the formation of {111} texture which is harmful to magnetism and form {100} which is a favorable texture, but when it is added in excess of 0.05% Therefore, in one embodiment of the present invention, the addition amount of P is limited to 0.026 to 0.049% by weight.

C: 0.005 wt% or less

 When C is added heavily, it enlarges the austenite region and increases the phase transformation period. It suppresses the grain growth of ferrite during annealing and increases the iron loss. It combines with Ti and forms carbide to dislocate magnetism. , The iron loss is increased by magnetic aging at the time of use after use, so that it is limited to 0.005 wt% or less in one embodiment of the present invention.

S: 0.001 to 0.005% by weight or less

S is an element which forms sulfides such as MnS, CuS and (Cu, Mn) S harmful to the magnetic properties, and therefore it is preferable to add S as low as possible. However, when it is added in an amount of less than 0.001%, it is rather disadvantageous to formation of aggregate structure and magnetic property is deteriorated. Therefore, it is added in an amount of 0.001% or more, and when it is added in an amount exceeding 0.005%, the magnetic property is heated due to increase of fine sulfides. In one embodiment, the content of S is limited to 0.001 to 0.005% by weight.

N: 0.005 wt% or less

N is an element which is detrimental to magnetism such as forming a nitride by binding strongly with Al, Ti or the like to inhibit grain growth. Therefore, it is preferable that N is contained in a small amount. In one embodiment of the present invention, N is limited to 0.005 wt% or less.

Ti: 0.005 wt% or less

Ti forms fine carbides and nitrides to inhibit crystal growth. As the amount of Ti is increased, the texture is disadvantageously lowered due to increased carbides and nitrides. Therefore, in one embodiment of the present invention, the content of Ti is less than 0.005 wt% .

Sn + Sb: 0.01 to 0.2 wt%

The Sn and Sb suppress the diffusion of nitrogen through the grain boundaries as a segregated element in the grain boundaries and suppress the {111} texture which is detrimental to the magnetism and increase the magnetic property by increasing {100} When Sn + Sb is added in an amount exceeding 0.2% by weight, the grain growth is inhibited and the magnetism is lowered and the rolling property is deteriorated. Therefore, in one embodiment of the present invention, the value of Sn + %.

In addition to the above elements, Cu, Ni, and Cr, which are inevitably added in the steelmaking process, react with impurity elements to form fine sulfides, carbides, and nitrides, thereby detrimentally affecting the magnetic properties. It limits. Since Zr, Mo, and V are also strong carbonitride-forming elements, they are preferably not added, and are limited to 0.01 wt% or less.

In addition to the above composition, the remainder is composed of Fe and other unavoidable impurities.

In one embodiment of the present invention, the addition amounts of Mn, Al and P satisfy a composition formula of 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] , Mn is less influenced on the resistivity than Al, and therefore it is possible to improve the magnetism in the high-frequency region by compensating for the decrease in the amount of Al, and to increase the texture, a large amount of Mn must be added. The effect of suppressing the growth of the crystal grains is enhanced when the element or the amount of addition improving the texture is increased, so that the addition amount can be properly controlled. That is, by increasing the amount of Mn and controlling the addition amount of P, it is possible to improve the magnetization in the high-frequency region and the author region by improving the magnetic flux density by improving the texture.

If the proportion of Mn, Al and P added is controlled by a composition formula of 2 * ([Al] + [P]) / [Mn] 1 and 10 * [P] / [Al] Can be simultaneously improved to produce a non-oriented electrical steel sheet excellent in magnetic properties in high-frequency and low-field regions.

Hereinafter, a method for manufacturing a non-oriented electrical steel sheet according to the present invention will be described.

In order to manufacture the non-oriented electrical steel sheet according to an embodiment of the present invention, the steel sheet may contain 1.5 to 3.5% of Si, 0.15 to 0.45% of Al, 0.61 to 1.12% of Mn, 0.026 to 0.049% of P, C: not more than 0.005% (excluding 0%), N: not more than 0.005% (excluding 0%), S: 0.001 to 0.005%, and Ti: not more than 0.005% Wherein the Mn, Al and P satisfy the following composition formula of 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] The steel slab is reheated to 1200 ° C or less and then hot rolled.

If the reheating temperature is higher than 1200 ° C., the precipitates such as AlN and MnS existing in the slab may be re-heated at the time of hot rolling to suppress the grain growth and decrease the magnetism, so that the reheating temperature is limited to below 1200 ° C. In addition, finish rolling in hot rolling is finished in ferrite and final rolling reduction is 20% or less for plate shape calibrating.

The hot-rolled sheet prepared as described above is rolled up at 700 ° C or less and cooled in air. The rolled hot-rolled sheet can be subjected to hot-rolled sheet annealing and pickling, if necessary. After that, cold rolling is performed and finally cold rolled sheet annealing is performed.

The hot-rolled sheet annealing is to anneal the hot-rolled sheet when necessary for improving the magnetic properties, and the hot-rolled sheet annealing is performed at a temperature in the range of 850 to 1150 ° C. If the annealing temperature of the hot-rolled sheet is lower than 850 캜, the grain growth is insufficient. If the annealing temperature exceeds 1150 캜, the grain grows excessively and the surface defects of the plate become excessively excessive. It is limited to 1150 ℃.

The hot-rolled sheet picked up by a conventional method or the annealed hot-rolled sheet obtained by annealing the hot-rolled sheet is finally cold-rolled to a thickness of 0.10 mm to 0.70 mm. If necessary, cold rolling can be carried out twice or more between primary cold rolling and intermediate annealing, and the final rolling reduction is in the range of 50 to 95%.

The final cold-rolled steel sheet is cold-rolled sheet annealed. In the step of annealing the cold rolled sheet, the temperature of the annealing of the cold rolled sheet during annealing is 850 to 1100 占 폚. If the annealing temperature of the cold-rolled sheet is less than 850 캜, the grain growth is insufficient and the grain growth is insufficient. When the annealing temperature is more than 1100 캜, the grain growth excessively affects the magnetism badly. Therefore, Is limited to 850 ~ 1100 ℃.

The cold-rolled annealed sheet is shipped to the customer after the insulating coating treatment. The insulating coating may be treated with an organic, inorganic and organic composite coating, or may be treated with other insulating coatings. The customer can use the steel sheet after processing.

Hereinafter, the present invention will be described in more detail with reference to Examples.

[Example 1]

Alloys were prepared by vacuum melting to form the steel ingots as shown in Table 1 below. Each steel ingot was heated at 1160 DEG C, hot rolled to a thickness of 2.5 mm, and then wound. The hot-rolled steel sheet wound and cooled in air was annealed at 1,050 ° C for 2 minutes, pickled, cold-rolled to a thickness of 0.35 mm, and finally annealed at 1010 ° C for 100 seconds. The grain size was measured by the intercept method and the iron loss (W _10/400 ) and the magnetic flux density (B) were measured by X-ray pole figure test for each specimen. ₁ ) were measured. The results are shown in Table 2 below.

In the X-ray pole figure measurement method, the surface of the specimen was polished to a thickness of 3 / 4t, and poles of (110), (200) and (211) were measured with an X-ray diffractometer as a result, 100 [001] 110 [001] 100 [011] texture fraction V _c, V _g, V _rc and (111) sets the volume of the fraction of the tissue V ₍₁₁₁₎ of The volume fraction was calculated.

Steel grade C Si Mn P S Al N Ti Sn Sb A1 0.0027 1.9 0.66 0.034 0.0014 0.09 0.0021 0.0021 0 0.056 A2 0.0026 2.6 0.44 0.029 0.0033 0.24 0.0026 0.0018 0 0.037 A3 0.0015 2.7 0.80 0.034 0.0027 0.21 0.0016 0.0021 0.057 0.046 A4 0.0034 3.4 0.75 0.027 0.0012 0.27 0.0018 0.0016 0.089 0.012 A5 0.0033 3.0 0.81 0.044 0.0019 0.35 0.0026 0.0011 0 0.034 A6 0.0025 2.9 0.73 0.046 0.0015 0.31 0.0027 0.0008 0.037 0 A7 0.0037 2.8 0.88 0.013 0.003 0.46 0.0014 0.0012 0.019 0.016 A8 0.0016 3.1 0.86 0.061 0.0021 0.31 0.0019 0.0016 0.027 0.028 A9 0.0019 3.2 0.61 0.021 0.0038 0.24 0.0017 0.0031 0.034 0 A10 0.0023 3.4 0.64 0.027 0.0026 0.34 0.0037 0.0034 0.019 0.067 A11 0.0027 2.7 0.61 0.028 0.0032 0.26 0.0023 0.0016 0.067 0 A12 0.0017 3.3 0.86 0.041 0.0022 0.33 0.003 0.0012 0.055 0.024 A13 0.0018 3.2 1.12 0.048 0.0024 0.45 0.0019 0.002 0.042 0.018

Steel grade 2 * ([Al] + [P])
/ [Mn] 10 * [P]
/ [Al] (V _c + V _g + V _rc )
/ V _{111} Particle size
(탆) Iron loss
W _10/400 Magnetic flux density
B ₁ Remarks A1 0.38 3.78 0.35 72 19.2 1.04 Comparative Example A2 1.22 1.21 0.31 87 18.6 0.94 Comparative Example A3 0.61 1.62 0.37 89 16.4 1.15 Honor A4 0.79 1.00 0.36 91 15.8 1.13 Honor A5 0.97 1.26 0.41 97 15.7 1.03 Honor A6 0.98 1.48 0.44 103 16.3 1.16 Honor A7 1.08 0.28 0.33 103 17.6 0.97 Comparative Example A8 0.86 1.97 0.34 69 17.5 0.95 Comparative Example A9 0.86 0.88 0.3 94 17.9 0.98 Comparative Example A10 1.15 0.79 0.33 97 17.5 0.96 Comparative Example A11 0.94 1.08 0.38 110 16.2 1.15 Honor A12 0.86 1.24 0.36 91 15.7 1.08 Honor A13 0.89 1.07 0.42 106 15.5 1.1 Honor

1) _Iron loss (W _10/400 ) is the average loss (W / kg) in the rolling direction and in the rolling direction perpendicular to the magnetic flux density of 1.0 Tesla at 400 Hz frequency.

2) The magnetic flux density (B ₁ ) is the magnitude of the magnetic flux density (Tesla) induced when a magnetic field of 100 A / m is added.

[Al], [P] and 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] (V _c + V _g + V _rc ) / V _{111} of 0.35 to 0.45 were obtained from the texture measurement results of the grades A3, A4, A5, A6, A11, A12 and A13 satisfying the composition formula of & As a result, the high frequency iron loss W _10/400 was low and the magnetic flux density B ₁ in the high magnetic field region was also high.

On the other hand, A2 did not satisfy the composition formula above the Mn range beyond the control range, and the result of the texture measurement (V _c + V _g + V _rc ) / V _{111} was 0.35 or less. As a result, The density was also low.

A1 satisfies the above formula and the aggregate texture measurement value (V _c + V _g + V _rc ) / V _{{111} is} also good, but Al is out of the management range and the iron loss is inferior.

A8 was satisfied with the composition formula but P exceeded the control range and the aggregate structure measurement result (V _c + V _g + V _rc ) / V _{111} was 0.35 or less. As a result, iron loss and magnetic flux density were inferior .

A7, A9, A10 is [Mn], [Al], but the amount of [P] is satisfied were not satisfy the above formula, the texture measurements _{(V c + V g + V} rc) / V {111} Of 0.35 or less. As a result, iron loss and magnetic flux density were inferior.

[Example 2]

A steel ingot was prepared as shown in Table 3 through vacuum melting. At this time, the effect of the annealing temperature of the hot - rolled sheet and the annealing temperature of the cold - rolled sheet on the texture, crystal grain size and magnetism was investigated. Each steel ingot was heated at 1190 占 폚, hot rolled to a thickness of 2.7 mm, and then wound. The hot-rolled steel sheet was rolled in air and cooled and annealed at 800 to 1200 ° C for 2 minutes, pickled, cold-rolled to a thickness of 0.35 mm, and cold rolled sheet annealed at 800 to 1150 ° C for 90 seconds. For each specimen, the fraction of the texture was measured by an X-ray pole figure test. The particle size was measured using the intercept method and the iron loss (W _10/400 ) and magnetic flux density (B ₁ ) were measured The results are shown in Table 4 below.

Steel grade C Si Mn P S Al N Ti Sn Sb B1 0.0034 2.7 0.74 0.037 0.0013 0.31 0.0024 0.0008 0.024 0.027 B2 0.0021 3.3 0.86 0.041 0.0029 0.37 0.0016 0.0016 0 0.024 B3 0.0019 3.4 0.76 0.064 0.0036 0.26 0.0011 0.0021 0.064 0.034 B4 0.0034 2.7 0.47 0.031 0.0021 0.11 0.0019 0.002 0.031 0 B5 0.0041 3.2 0.55 0.026 0.0024 0.21 0.0027 0.0019 0.018 0.037 B6 0.0033 2.8 0.62 0.034 0.0034 0.15 0.0034 0.0035 0.029 0.067 B7 0.0016 3.2 1.01 0.049 0.0017 0.44 0.0031 0.0031 0 0.032 B8 0.0026 2.9 0.53 0.018 0.0016 0.16 0.0022 0.0024 0.028 0.016 B9 0.0021 3.1 0.51 0.024 0.0022 0.21 0.0026 0.0023 0.009 0.044 B10 0.0017 3 0.83 0.038 0.0027 0.35 0.0016 0.0017 0.068 0

Steel grade 2 * ([Al] +
[P]) / [Mn] 10 * [P]
/ [Al] Hot-rolled plate
Annealing temperature
(° C) Cold rolled plate
Annealing temperature
(° C) (V _c + V _g +
V _rc ) / V _{111} particle
size
(탆) Iron loss
W _10/400 Magnetic flux
density
B ₁ Remarks B1 0.94 1.19 1120 1030 0.36 116 16.4 1.16 Honor B2 0.96 1.11 1080 960 0.41 103 15.7 1.07 Honor B3 0.85 2.46 1030 870 0.29 47 18.1 0.98 Comparative Example B4 0.60 2.82 1030 840 0.32 59 18.6 0.94 Comparative Example B5 0.86 1.24 1030 1080 0.38 135 15.8 1.12 Honor B6 0.59 2.27 1070 910 0.44 75 16.7 1.11 Honor B7 0.97 1.11 980 960 0.42 81 16.2 1.04 Honor B8 0.67 1.13 1180 1120 0.28 164 17.3 0.98 Comparative Example B9 0.92 1.14 830 960 0.33 86 17.8 0.95 Comparative Example B10 0.93 1.09 1130 1010 0.44 94 15.4 1.06 Honor

[Al], [P] and 2 * ([Al] + [P]) / [Mn] 1, 10 * [P] / [Al] (V _c + V _g + V _rc ) / V _{111} satisfying the composition formula of > = 1 and satisfying the annealing temperature of the hot-rolled sheet and the annealing temperature of the cold- _{} Of} 0.35 to 0.45 and the grain size of 50 ~ 150 _㎛ . As a result, the high frequency iron loss W _10/400 was low and the magnetic flux density B ₁ in the high magnetic field region was also high.

On the other hand, B3 is the formula and the hot-rolled sheet annealing temperature and the cold-rolled sheet satisfy the annealing temperature for the addition amount of a P escaped the administrative scope texture _{measurements, (V c + V g +} V rc) / V {111} Fig. 0.35 And the grain size was less than 50 ㎛. As a result, iron loss and magnetic flux density were inferior.

Further, B4 and B9 have a composition formula of [Mn], [Al], [P] and 2 * ([Al] + [P]) / [Mn] (V _c + V _g + V _rc ) / V _{111} was less than 0.35, indicating that iron loss and magnetic flux density were inferior to those of the cold rolled and annealed hot rolled sheets.

B8 satisfied the composition formula of [Mn], [Al], [P] and 2 * ([Al] + [P]) / [Mn]? 1, 10 * [P] / [Al]? 1, (V _c + V _g + V _rc ) / V _{111} was 0.35 or less as a result of the aggregate structure measurement. Further, the annealing temperature was too high and the annealing temperature was too high, And the size is 150 mu m or more. As a result, iron loss and magnetic flux density are inferior.

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

Claims (3)

The steel sheet according to any one of claims 1 to 3, wherein the steel sheet comprises, by weight, 1.5 to 3.5% of Si, 0.15 to 0.45% of Al, 0.61 to 1.12% of Mn, 0.026 to 0.049% of P, 0.001 to 0.005% of S, and 0.005% or less of Ti (exclusive of 0%), the balance being Fe and other inevitably added impurities, and Mn, Al, ([Al] + [P]) / [Mn]? 0.98 and 10 * [P] / [Al]
Reheating the slab further containing 0.01 to 0.2% by weight of Sn + Sb to 1200 ° C or less;
Hot rolling the reheated slab;
Annealing the hot-rolled hot-rolled sheet in a temperature range of 850 to 1150 캜 and cold-rolling the hot-rolled sheet; And
And finally annealing the cold-rolled cold-rolled sheet at a temperature of 850 to 1100 ° C,
(V _c + V _g + V _rc ) / V _{111} &_lt; / ₌ 0.45 in the non-oriented electrical steel sheet.
Here, [Al], [P] and [Mn] are the weight percentages of Al, P and Mn added, respectively.
However, the above V _c, V _g, V _rc is 100 [001] 110 [001] 100 [011] The volume fraction of texture, V ₍₁₁₁₎ is {111} texture . The method according to claim 1,
Further comprising 0.05 wt% or less (excluding 0 wt%) of Cu, Ni and Cr, respectively, and further containing 0.01 wt% or less (excluding 0 wt%) of Zr, Mo and V, respectively. The method according to claim 1,
Wherein said cold rolling is cold rolling at least two times with primary cold rolling or intermediate annealing being interposed therebetween.