WO2019132130A1

WO2019132130A1 - Non-oriented electrical steel sheet and method for producing same

Info

Publication number: WO2019132130A1
Application number: PCT/KR2018/005624
Authority: WO
Inventors: 이현주; 김용수; 신수용
Original assignee: 주식회사 포스코
Priority date: 2017-12-26
Filing date: 2018-05-16
Publication date: 2019-07-04
Also published as: KR102026271B1; KR20190078167A

Abstract

A non-oriented electrical steel sheet according to an embodiment of the present invention comprises 2.6 to 3.6 wt% of Si, 0.2 to 1.3 wt% of Al, 0.1 to 1.5 wt% of Mn, 0.005 wt% or less (excluding 0 wt%) of C, 0.005 wt% of less (excluding 0 wt%) of N, 0.005 wt% or less (excluding 0 wt%) of S, 0.005 to 0.1 wt% of Sn, 0.005 to 0.1 wt% of Sb, 0.005 to 0.1 wt% of P, and the remainder including Fe and inevitable impurities, wherein the fraction of area of a composite structure having an orientation of 15° or less from {lll}<uvw> is 20% or less, and the fraction of area of a composite structure having an orientation of 15° or less from {001}<130> is 5% or more.

Description

2019/132130 1 »(: 1 ^ 1 {2018/005624

【Specification】

Title of the Invention

Non-oriented electrical steel sheet and manufacturing method thereof

TECHNICAL FIELD

A non-oriented electrical steel sheet and a manufacturing method thereof. Specifically ,

To an excellent non-oriented electrical steel sheet and a manufacturing method thereof.

TECHNICAL BACKGROUND OF THE INVENTION

The nonoriented electrical steel sheet is mainly used in motors that convert electrical energy into mechanical energy. In order to achieve high efficiency, nonmagnetic steel sheets require excellent magnetic properties. Especially in recent years, it has become very important to increase the efficiency of the motor, which accounts for more than half of the total electric energy consumption, as the environment friendly technology is attracting attention. Therefore, the demand of the non-oriented electric steel sheet having excellent magnetic properties is also increasing.

The magnetic properties of nonoriented electrical steel sheets are mainly evaluated by iron loss and magnetic flux density. Iron loss means energy loss occurring at a specific magnetic flux density and frequency, and magnetic flux density means the degree of magnetization obtained under a specific magnetic field. The lower the core loss, the more energy efficient motors can be manufactured under the same conditions. The higher the magnetic flux density, the smaller the motor and the copper hands can be reduced. Therefore, the non-directional electric steel sheet having low iron loss and high magnetic flux density is made It is important.

The characteristics of the non-oriented electrical steel sheet to be considered according to the operating conditions of the motor also vary. As a criterion for evaluating the characteristics of non-oriented electrical steel sheets used in motors, 115/50 iron loss is considered to be the most important when many motors have 1.5 magnetic fields at a commercial frequency of 50 ¾. However, all motors for various applications do not always consider the ¥ 15/50 iron loss as the most important, and may also evaluate iron loss at different frequencies or applied magnetic fields depending on the main operating conditions. Especially in recent large generators and electric motor drive motors 2019/132130 1 »(: 1 ^ 1 {2018/005624

Among the nonoriented electrical steel sheets to be used, magnetic properties are important in the case of 1. (X1 or below). Therefore, the characteristics of nonoriented electrical steel sheets with 110/50 or 10/400 / .

A commonly used method for increasing the magnetic properties of non-oriented electrical steel sheets is to add alloying elements such as the above. The addition of these alloying elements can increase the resistivity of the steel. The higher the resistivity, the lower the eddy current loss and the lower the total iron loss. On the other hand, there is a disadvantage in that the magnetic flux density is decreased and the brittleness is increased as the addition amount is increased, and when it is added in a certain amount or more, cold rolling is impossible and commercial production becomes impossible. In particular, the thinner the thickness of the electric steel sheet, the lower the iron loss can be seen. The lowering of the rolling property due to the brittleness is a fatal problem. By the addition of elements such as when, 1 ₁₁ for further lesson the resistivity can be increased to produce the magnetic fine excellent non-oriented electrical steel sheet. ·

As the amount of alloying elements increases and the thickness of the steel sheet becomes thinner and the cold reduction ratio increases, the magnetic flux density of the nonoriented electrical steel sheet decreases. By suppressing the development of an unfavorable orientation to the magnetism and developing a bearing favorable to the magnetism, Can be improved at the same time. In order to improve the texture, there is a method of adding a small amount of special elements, annealing the hot rolled steel sheet, or reducing the cold rolling rate, but it was not effective in improving the texture.

DISCLOSURE OF THE INVENTION

[Problem to be solved]

One embodiment of the present invention provides a non-oriented electrical steel sheet and a method of manufacturing the same. Specifically, the four, _11, defining the content range of C, and ¾ _1, controls the optimum total amount of I ^5, and by a low control of the annealing temperature during the final annealing, the {001} <130> and the development of orientation, The present invention provides a non-oriented electrical steel sheet excellent in magnetic properties by suppressing the development of orientation of {111} < ₁₁ >

MEANS FOR SOLVING THE PROBLEMS

The non-oriented electrical steel sheet according to one embodiment of the present invention may contain, by weight, 2.6 to 3.6%, 0.2 to 1.3%, 0.1 to 1.5%, 0 to 0.005% 2019/132130 1 »(: 1 ^ 1 {2018/005624

: 0.005% or less (excluding 0%), 0.005% or less (excluding 0%), 0.005 to 0.1%, ¾: 0.005 to 0.1% and? : 0.005 to 0.1%, the balance including? Ø and unavoidable impurities,

And the area fraction of the texture having an orientation within 15 DEG from {001} < 130 > is 5% or more.

The non-oriented electrical steel sheet according to one embodiment of the present invention may have a total amount of ¾, ¾, and moles of 0.025 to 0.20% by weight.

The non-oriented electrical steel sheet according to one embodiment of the present invention

0.005 wt% or less, 0.005 wt% or less, and 0.005 wt% or less.

The non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 70 to 150.

The non-oriented electrical steel sheet according to one embodiment of the present invention may have a thickness of the steel sheet of 0.1 to 0.65.

The non-oriented electrical steel sheet according to one embodiment of the present invention has the following formulas

3 < / RTI >

[Formula ¹ ]

650 (45 DEG) < 850 (60 DEG)

[Expression]

650 (0 DEG) / 650 (90 DEG) > 1.03

[Formula 3]

650 (0 DEG) / 650 (45 DEG) > 1.06

(Formula (1) in to equation 3 350 (0 °), 650 (45 °), 650 (60 °), 650 (90 °) is respectively in the rolling _direction, the rolling direction and the _{45 °, 60 °,} measured in the _{90 °} direction Magnetic flux density criminals 50). )

C: not more than 0.005% (excluding 0%), N: not more than 0.005% (excluding 0%), C: 0.2 to 1.3% 0.005% or less (excluding 0%), ¾ _{1: 0.005} % to 0.1%, and 0.005% to 0.1%. : 0.005 to 0.1%, and the remainder comprising muscles and unavoidable impurities; Heating the slab; The slab was hot rolled 2019/132130 1 »(: 1 ^ 1 {2018/005624

Producing a hot rolled sheet; The hot-rolled sheet was cold-rolled at a reduction ratio of 55 to 75%

And annealing.

Slabs _{1 ¾, ¾,} and? Is the number of days from 0.025 to 0.20% by weight of the sum of the amount. The slab may further contain at least one of 0.005 wt% or less, 0.005 wt% or less, and 0.005 wt% or less.

After the hot rolling step, it may further include annealing the hot rolled sheet in the range of 850 to 1150 DEG (:).

After the step of producing the hot rolled plate, the cold rolling step and the intermediate annealing step may be further included.

The intermediate annealing temperature may be from 850 to 11501 :.

【Effects of the Invention】

The non-oriented electrical steel sheet according to an embodiment of the present invention has a ratio

Limiting the content ranges of £ and ¾ _1, ¾, controls the optimum total amount of I ^3, and by a low control of the final annealing four annealing temperature, the {001} <130> and developed the orientation, {111} _<11 ñ bearing The magnetism can be improved.

This makes it possible to manufacture eco-friendly automobiles, high-efficiency home appliances, and super premium class electric motors.

DETAILED DESCRIPTION OF THE INVENTION

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms used herein are intended to encompass the singular forms < RTI ID = 0.0 > 2019/132130 1 »(: 1 ^ 1 {2018/005624

It also includes forms. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition. ,

When any part of the mentioned that ^'1 on "or" over "' of the other part, which can be can be directly on or above the other part, or accompanied by different parts therebetween. In contrast, when referring to a part being "directly above" another part, no other part is interposed therebetween.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further construed to have meanings consistent with the relevant technical literature and the presently disclosed subject matter and are not to be construed as ideal or very formal meanings unless defined otherwise.

Unless otherwise noted,% means% by weight, and%

0.00 double percent.

In an embodiment of the present invention, the meaning of further including additional elements means that iron is replaced by an additional amount of additional elements. Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In one embodiment of the present invention, the content range of the hour, addition, 0, and ratio is limited _,

I ³ is controlled and the annealing temperature during the final annealing is controlled to be low to develop a {001} <130> orientation and suppress the development of the {111} < _{11 \} > orientation, Steel plate.

The non-oriented electrical steel sheet according to an embodiment of the present invention may contain, by weight%: 2.6 to 3.6%, Si: 0.2 to 1.3%, 111: 0.1 to 1.5%, C: 0.005% : 0.005% or less (excluding 0%), 5: 0.005% or less (excluding 0%), 2019/132130 1 »(: 1 ^ 1 {2018/005624

0.005 to 0.1%, ¾: 0.005 to 0.1%, and 0.005 to 0.1%, and the balance contains ₆ and unavoidable impurities.

First, the reason for limiting the components of the non-oriented electrical steel sheet will be described. : 2.6 to 3.6 wt%

Silicon () enhances the resistivity of the material and lowers the iron loss, and when added too little, the iron loss improvement effect may be insufficient _. On the other hand, if too much is added, the brittleness of the material may increase and the rolling productivity may be deteriorated drastically. Therefore, ^ can be added in the above range. More specifically 2.7 to 3.5% by weight.

Hour: 0.2 to 1.3 wt%

Aluminum (Si) plays a role of lowering the iron loss by increasing the resistivity of the material, and if it is added too little, the nitride may be formed finely and the magnetism may be lowered. On the other hand, if it is added too much, excessive nitrides are formed to deteriorate the magnetic properties, which can cause problems in all processes such as steelmaking and continuous casting, thereby greatly reducing the productivity. Therefore, poisons can be added in the above-mentioned range. More specifically, 0.3 to 1.2% by weight of silica can be contained.

^ 0.1 to 1.5 wt%

If too little is added, sulfide may be precipitated to a fine extent, which may degrade magnetism. Conversely, if too much is added, the magnetic flux density can be reduced by promoting the formation of {111} texture which is detrimental to magnetism. Therefore, the above range can be added. And more specifically 0.2 to 1.4% by weight.

0: 0.005% by weight or less

Carbon (0) may be limited to 0.005% by weight or less, more specifically, 0.003% by weight or less, because it causes magnetic aging and combines with other impurity elements to generate carbide to deteriorate magnetic properties.

0.005 wt% or less

Nitrogen) forms fine and elongated precipitates inside the base material, 2019/132130 1 »(: 1 ^ 1 {2018/005624

It may be limited to 0.005% by weight or less, more specifically 0.003% by weight or less, because it forms fine nitrides in association with other impurities to inhibit grain growth and deteriorate iron loss.

Less than 0.005% by weight

Sulfur ratio) is preferably as low as 0.005% by weight or less, more specifically 0.003% by weight or less, because it forms a fine sulfide inside the base material to inhibit grain growth and deteriorates iron loss.

¾ _1,

: 0.005 to 0.1 wt%

Tin (¾0, antimony (, ⁵⁾ delays the segregation to the grain boundary or the surface of the base material by lowering the surface energy and the grain boundary precipitates suppress energy and {111} _{<11 \} ñ recrystallization and developing the favorable texture in the magnetic. ¾ _1, ¾,? Is less than 0.005% by weight of any one element has the effect that could significantly reduce. When ¾ _1, ¾, more than 0.1% by weight of any one element meujung increased brittleness to the side seokryang excessive and the surface quality is reduced, and the constraints generated in the commercial production.

¾ and I ³ is contained in the range of 0.025 to 0.20% by weight, the above-mentioned effect can be most apparent. More specifically, the total content of ¾ and ¾ may be 0.05 to 0.15% by weight.

, And V: 0.005 wt% or less

Titanium (), niobium, and vanadium (V) are very strong elements in intragranular precipitates. They form fine carbides or nitrides in the base material and inhibit crystal growth, thereby deteriorating iron loss. Therefore, when V is further included, it can be limited to 0.005 wt% or less, more preferably 0.003 wt% or less.

Other impurity elements

In addition to the above-mentioned elements ((1), (9), etc., inevitably incorporated impurities may be included. Although these elements are trace amounts, they may cause magnetic deterioration through the formation of intracellular inclusions. Therefore, they may be limited to (: not more than 0.025% by weight, not more than 0.002% by weight, not more than 0.005% by weight, and not more than 0.005% by weight.

Non-oriented electrical steel sheet according to one embodiment of the present invention from the {111} <¾ _\> 2019/132130 1 »(: 1 ^ 1 {2018/005624

The area fraction of the texture having orientation within 15 DEG is 20% or less and the area fraction of the texture having orientation within 15 DEG from {001} <130> is 5% or more.

In {111} < ₁₁ >, it means an arbitrary number, and means a direction in which the normal direction of the printing surface is parallel to <111> and the rolling direction is parallel to <>.

Similarly, {001} < 130 > means a direction in which the normal direction of the flat surface is parallel to < 001 > and the rolling direction is parallel to < 130 >.

The area fraction means the occupied area fraction of the aggregate structure over the entire rolled surface.

If the area fraction of the texture with orientation within 15 ° from {111} <π is too large, the magnetism may be thermally degraded, and the magnetism in the direction of rolling (especially in the direction of rolling) may suffer from heat. More specifically, the area fraction of the texture having an orientation within 15 DEG from {111} < ₁₁ > may be 10 to 17 area%.

If the area fraction of the texture with orientation within 15 DEG from {001} < 130 > is too small, the magnetism may be thermally damaged, and the magnetism in the rolling direction? More specifically, the area fraction of the texture having an orientation within 15 DEG from {001} < 130 > may be 7 to 10 area%.

The non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 70 to 150. The magnetic properties of the non-oriented electrical steel sheet are superior in the above-mentioned range.

The non-oriented electrical steel sheet according to one embodiment of the present invention has a thickness of 0.1 to < RTI ID = 0.0 >

0.65 < / RTI >

As described above, the non-oriented electrical steel sheet according to one embodiment of the present invention has improved magnetic properties, particularly magnetic flux density. Specifically, the following formulas 1 to 3 can be satisfied.

[Formula 1]

650 (45) < 650 (60)

[Formula 2]

650 (0 DEG) / 850 (90 DEG) > 1.03

[Formula 3]

650 (0 DEG) / 650 (45 DEG) > 1.06 2019/132130 1 »(: 1 ^ 1 {2018/005624

(Formula (1) in to equation 3 650 (0 °), 650 (45 °), 650 (60 °), 650 (90 °) is respectively in the rolling _direction, the rolling direction and the _{45 °,} _{60 °,} measured in the _{90 °} direction Magnetic flux density criminals 50). )

The magnetic flux density 650 is the magnetic flux density induced at a magnetic field of 5000 shots / ₁₁₁ .

When the non-oriented electrical steel sheet is used as a motor for an automobile by satisfying the above-mentioned formulas 1 to 3, it is excellent in iron loss and magnetic flux density and can be used as an electric vehicle drive motor to improve fuel economy and running performance.

The average value of the magnetic flux density in the rolling direction and in the direction perpendicular to the rolling direction 50 (ratio) can be 1.681 or more. More specifically, 85 can be 1.69 to 1.751 '.

0.27 占 The iron loss of 15/50 was 1.75 / 1 占_¾ or less when the magnetic flux density of 1.51: at the frequency of 50 占 was induced on the basis of the thickness. The iron loss 0 / 400 may be less than 12.5 [mu] m. A method of manufacturing a non-oriented electrical steel sheet according to an embodiment of the present invention includes the steps of: manufacturing a slab; Heating the slab; Hot rolling the slab to produce a hot rolled sheet; Cold-rolling the hot-rolled sheet to produce a hot-rolled sheet, and finally annealing the hot-rolled sheet.

Hereinafter, each step will be described in detail.

First, slabs are manufactured. The reason why the addition ratio of each composition in the slab is limited is the same as the reason for limiting the composition of the non-oriented electrical steel sheet described above, so repeated description is omitted. The composition of the slab is substantially the same as that of the non-oriented electrical steel sheet because the composition of the slab does not substantially change during the manufacturing process such as hot rolling, hot rolling annealing, cold rolling and final annealing described later.

First, the slab is heated. Specifically, the slab is charged into a heating furnace

It can be reused and finely precipitated after hot rolling.

The heated slabs are hot rolled to 2 to 2.3 占 and made of hot rolled sheets.

2019/132130 1 »(: 1 ^ 1 {2018/005624

Specifically, it may be 800 to 1000.

After the step of producing the hot-rolled steel sheet, the step of annealing the hot-rolled steel sheet may further include the step of annealing the hot-rolled steel sheet. At this time, the hot-rolled sheet annealing temperature of 850 to 1150 ^° (: may be. When the hot-rolled sheet annealing temperature is 850

, The structure does not grow or grow finely and the synergistic effect of the magnetic flux density is small. If the annealing temperature exceeds 11501, the magnetic properties are rather lowered and the rolling workability may be deteriorated due to the plate-like deformation. More specifically, the temperature range may be from 950 to 11251. More specifically, the annealing temperature of the hot-rolled sheet is 900 to 11001 :. The hot-rolled sheet annealing is performed in order to increase the orientation favorable to magnetism as required, and may be omitted.

Next, the hot rolled sheet is pickled and rolled to a predetermined thickness. In one embodiment of the present invention, it is possible to cold-roll at a reduction ratio of 55 to 75% to develop a {001} < 130 > orientation and inhibit the development of a {111} < _{11 &} When the reduction rate is too high, the recrystallized grains of {111} < _{11 \} ñ orientation are generated first and are present in high proportion in the final product as they grow. More specifically, it can be rolled at a rolling reduction of 60 to 70%.

The cold rolling can be carried out by cold rolling two or more times with intermediate annealing interposed therebetween. That is, after the step of producing the hot-rolled steel sheet, it may further include intermediate rolling and intermediate annealing. Even in this case, the final cold rolling can be hot rolled at a reduction ratio of 55 to 75% mentioned above.

At this time, the intermediate annealing temperature was 850 to 1150

Can be. Next, the hot rolled quenched plate is subjected to final annealing. The final annealing temperature was 900

&Lt; / RTI > If the final annealing temperature is too high, recrystallized grains of {111} <> orientations are generated first and are present in a high fraction in the final product while growing. Further, by annealing at such a low temperature, recovery of {001} < 130 > orientation and sufficient grain growth can occur. The final annealing time may be 100 to 1000 seconds. In the final annealing process, the average grain size can be 70 to 150 < -1 >, and all the processed structures formed in the previous rolling step can be recrystallized (i.e., 99% or more). 2019/132130 1 »(: 1 ^ 1 {2018/005624

Hereinafter, preferred embodiments and comparative examples of the present invention will be described. However, the following examples are only a preferred embodiment of the present invention, and the present invention is not limited to the following examples. Example

Slabs were prepared as shown in Tables 1 and 2 below. The slab was heated to 1150 ° C and hot rolled at a finishing temperature of 880 ° C to produce a hot rolled sheet having a thickness of 2.0 °. The hot-rolled hot-rolled sheet was annealed at 103010 for 100 seconds, pickled, and subjected to primary cold rolling to a thickness of 0.7 占 퐉. This was subjected to intermediate annealing at 1000 to 80 seconds and finally cold rolled to a thickness of 0.27 占 (reduction ratio of about 61%). After that, final annealing was carried out at 800 ℃ for 60◦ seconds. However, in the specimen No., the hot-rolled steel sheet was cold-rolled once without intermediate annealing to obtain 0.27? (A reduction ratio of about 87%). Specimen No. This was performed for 110 seconds at 1000 ° (:) of the final annealing condition.

Table 3 and Table 4 show the magnetic properties and the average crystal grain diameters for each grain. The magnetic properties such as magnetic flux density and iron loss were measured by cutting a specimen of 60 × 60 in length and 5 pieces in width for each specimen. To measure magnetic flux density per direction, the interval between the rolling direction (0 °) and the rolling direction (90 °) is 15th, 15th, 30th, 45th,

60 °, 75 °, and 90 °, and the specimens were cut five times each as described above. In this case, 10 10/400 is the iron loss when the magnetic flux density is 1.01 at the frequency of 40 cases ₂ , and 15/50 is the iron loss when the magnetic flux density of the 1st group is induced at a frequency of 50 이며, Means the magnetic flux density induced at a magnetic field of 5000 < RTI ID = 0.0 > _{111. &} Lt; / RTI >

The grain size of the grain was measured by taking an area of more than 1500 crystal grains in 10 sections of the specimen with an optical microscope (measured area / number of crystal grains 广 0.5).

The {001} <130> fraction and the {111} <ñ fraction were repeatedly measured in 50 sheets at a step interval of 2 111 with respect to the total thickness (270 _{11 111} ) X 5000 ₁ ^ area with 10 sections of each specimen! This was merged and calculated as a program.

[Table 1] 2019/132130 1 »(: 1/10/01 018/005624

[Table 2]

2019/132130 1 »(: 1/10/01 018/005624

[Table 3]

2019/132130 1 »(: 1/10/01 018/005624

[Table 4]

2019/132130 1 »(: 1 ^ 1 {2018/005624

As shown in Tables 1 to 4, show 4, show 5, 84, 65, 04, 05, and 4, the eggs satisfied the ranges of the present invention, , And the magnetic properties were also excellent. On the other hand, in the case of Show 1, Show 2, 61, 82, 01 and 02, the content of 0, ratio 1, V, V exceeded the range of the present invention, The magnetic properties were inferior. Shows 3, 63, 03, for 3 ¾ _1, out of the range of the content of ¾ present invention, even if the grain is not sufficiently grown, or the crystal grains are grown {001} <130> failure to orientation is developed the Magnetic Properties . 1) In case of 1, 02, the cold reduction ratio and the final annealing temperature were out of the range of the present invention, the crystal grains were excessively grown, and the {001} orientation was not developed and the magnetic properties were weakened.

The present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the scope of the present invention. Accordingly, it is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. As will be understood by those skilled in the art. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

Claims

\ \ 0 2019/132130 1> (: 1 '/ ¾¾2018 / 005624)

[Claim 1]

(Excluding 0%), N: not more than 0.005% (excluding 0%), N: 0.005% or less (excluding 0%), , _0.005 to 0.1%, and 0.005 to 0.1%, and the balance contains ₆ and unavoidable impurities, and {111 (inclusive): 0.005% or less (excluding 0%), ¾ _{1: 0.005} to 0.1% A non-oriented electrical steel sheet having an area fraction of an aggregate structure having an azimuth within 15 占 from < ₁₁ > of 20% or less and an area fraction of an aggregate structure having an azimuth within 15 占 from {001} .

[Claim 2]

The method according to claim 1,

Lt; RTI ID = 0.0 > _11% , < / RTI >

[Claim 3]

The method according to claim 1,

0.005 wt% or less, 0.005 wt% or less and V: 0.005 wt% or less.

Claim 4

The method according to claim 1,

Wherein the average grain size is 70 to 150 / h.

[Claim 5]

The method according to claim 1,

The thickness of the steel sheet is 0.1 to 0.65.

[Claim 6]

The method according to claim 1,

The non-oriented electrical steel sheet satisfying the following formulas (1) to (3).

[Formula 1]

650 (45 DEG) < 350 (60 DEG)

[Formula 2]

650 (0 DEG) / 650 (90 DEG) > 1.03

[Formula 3] 2019/132130 1 »(: 1 ^ 1 {2018/005624

850 (0 DEG) / 650 (45 DEG) > 1.06

(650 ° (0 °), 650 ° (45 °), 650 ° (60 °), and 650 ° (90 °) in the formulas 1 to 3 are measured in the rolling direction and the rolling direction in the directions of 45 °, 60 °, and 90 ° Magnetic flux density criminals 50). )

Claim 71

(Excluding 0%), N: not more than 0.005% (excluding 0%), N: 0.005% or less, 0.005 to 0.1% and 0.005 to 0.1%, and the remainder being? Ø and unavoidable impurities, in an amount of not more than 0.005% (excluding 0%), ¾: 0.005 to 0.1¾ _> , ¾: 0.005 to 0.1% step ;

Heating the slab;

Hot rolling the slab to produce a hot rolled sheet;

Hot rolling the hot rolled sheet at a reduction ratio of 55 to 75% to produce a cold rolled sheet; and

And finally annealing the cold-rolled sheet at a temperature of 9001 or less.

8.

8. The method of claim 7,

Wherein the slab has a total amount of ¾, ¾ and I ³ of 0.025 to 0.20 wt%.

Claim 91

8. The method of claim 7,

Wherein the slab further comprises at least one of 0.005 wt% or less, 0.005 wt% or less and V: 0.005 wt% or less.

[Claim 10]

8. The method of claim 7,

Wherein the slab is heated at a temperature of 120010 or less in the step of heating the slab.

Claim 11 2019/132130 1 »(: 1 ^ 112018/005624

8. The method of claim 7,

A method for producing a non-oriented electrical steel sheet.

Claim 12

8. The method of claim 7,

Further comprising the step of annealing the hot-rolled steel sheet in the range of 850 to 11501: after the hot-rolling step.

Claim 13

8. The method of claim 7,

Further comprising a cold rolling step and an intermediate annealing step after the step of producing the hot rolled steel sheet.

[14]

14. The method of claim 13,

Wherein the intermediate annealing temperature is from 850 to 11501.