WO2017111548A1

WO2017111548A1 - Non-directional electrical steel sheet and method for manufacturing same

Info

Publication number: WO2017111548A1
Application number: PCT/KR2016/015225
Authority: WO
Inventors: 이현주; 김용수; 신수용
Original assignee: 주식회사 포스코
Priority date: 2015-12-23
Filing date: 2016-12-23
Publication date: 2017-06-29
Also published as: KR101701194B1; WO2017111548A8; CN108474078A; JP2019507243A; US20190017135A1; JP7026620B2

Abstract

A non-directional electrical steel sheet according to an embodiment of the present invention comprises, in wt%, 2.5 to 3.3% of Si, 0.05 to 1% of Al, 0.05 to 1% of Mn, 0.01% or less of S (not including 0%), 0.005% or less of N (not including 0%), 0.005% or less of C (not including 0%), 0.005% or less of Ti (not including 0%), 0.005% or less of Nb (not including 0%), 0.001 to 0.1% of P, 0.001 to 0.1% of Sn, and 0.001 to 0.1% of Sb, with the remainder being Fe and unavoidable impurities, and satisfies Formulas 1 to 3 below. [Formula 1] 1.7 ≤ [Si]/([Al] + [Mn]) ≤ 2.9 [Formula 2] 50 ≤ 13.25+11.3*([Si]+[Al]+[Mn]/2) ≤ 60 [Formula 3] 0.025 ≤ [P]+[Sn]+[Sb] ≤ 0.15 (In Formulas 1 to 3, [Si], [Al], [Mn], [P], [Sn], and [Sb] represent the content (in wt%) of Si, Al, Mn, P, Sn, and Sb, respectively.)

Description

【Specification】

[Name of invention]

Non-oriented electrical steel sheet and manufacturing method

Technical Field

It relates to a non-oriented electrical steel sheet and a method of manufacturing the same.

[Technique to become background of invention]

Non-oriented electrical steel sheet is mainly used in the equipment that converts electrical energy into mechanical energy, which requires excellent magnetic properties to achieve high efficiency in the process. Magnetic properties include iron loss and magnetic flux density. Low iron loss can reduce energy lost in energy conversion process, and high magnetic flux density can produce more power with the same electrical energy. Low iron loss and high magnetic flux density increase the motor's energy efficiency. In general, in order to lower the iron loss of non-oriented electrical steel sheet, an element that increases resistivity is added or a method of rolling a steel sheet to a thin thickness is used. A commonly used method for increasing the magnetic properties of non-oriented electrical steel sheets is to add Si as an alloying element. Increasing the resistivity of the steel through the addition of Si has the advantage of lowering the high frequency iron loss, but the magnetic flux density is inferior and the workability is lowered. In particular, the electrical steel sheet used for high-frequency applications can increase the iron loss reduction effect as the thickness is made thinner, the workability degradation due to the addition of Si becomes a fatal problem in the rolling mill.

In order to overcome the deterioration of workability due to the addition of Si, other resistivity increasing elements, such as Al and Mn, may be added. Iron loss can be reduced through the addition of these elements, but the magnetic flux density is deteriorated due to the increase of the total alloy amount, and the rolling is difficult due to the increase in hardness and the workability of the material. In addition, AΓ and Mn combine with impurities inevitably present in the steel sheet to finely deposit nitrides or sulfides, and thus worsen iron loss. For this reason, impurities are managed extremely low in the steelmaking stage of the non-oriented electrical steel sheet, thereby generating fine precipitates that hinder the movement of the wall. By suppressing, the method of reducing iron loss is used. However, the method of improving iron loss through high cleanliness of steel does not have a large effect of improving magnetic flux density, which is a disadvantage of deterioration of steel workability and increase of cost. In order to improve the magnetism of non-oriented electrical steel sheet, various methods have been proposed to manufacture a thin product thickness, add a special element that can improve the magnetism, or optimize grain size and texture. Method of improving the magnetism of non-oriented electrical steel by adding REM, making grain size larger after hot-rolled sheet annealing, rolling and recrystallizing annealing, using cast steel less than 50mm thick, caused by columnar tissue // A method of improving the magnetism by retaining the ND orientation has been proposed. However, if they are applied to the actual production process, there is a problem that the cost is rapidly increased, the production using the existing equipment is impossible, or the productivity is excessively lowered.

[Content of invention]

Problem to be solved

One embodiment of the present invention to provide a non-oriented electrical steel sheet having excellent magnetic properties and at the same time high productivity by precisely controlling the content of Si, Al, Mn in the additive components of the steel.

Another embodiment of the present invention is to provide a method for producing a non-oriented electrical steel sheet.

[Solution of problem]

The non-oriented electrical steel sheet according to an embodiment of the present invention is a weight ¾ », Si: 2.5 to 3.3%, Al: 0.05 to 1% 'Mn: 0.05 to 1%, S: 0.01% or less (including 0% N: 0.005% or less (does not contain 0%), C: 0.005% or less (does not contain 0%), Ti: 0.005% or less (does not contain 0%) ᅳ Nb: 0.005% (Not including 0%), P: 0.001 to 0.1%, Sn: 0.001 to 0.1%, and Sb: 0.0 () l to 0.1%, the balance includes Fe and inevitable impurities, and the following formula 1 to 3 are satisfied.

[Equation 1]

1.7 <[Si] / ([Al] + [Mn]) <2.9 50 <13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) <60

[Equation 3]

0.025 <[P] + [Sn] + [Sb] <0.15

(Wherein [Si], [A1], [Mn], [P], [Sn] and [Sb] in the formulas 1 to 3 are the contents of Si, Al, Mn, P, Sn and Sb (% by weight )

Less than 0.001 wt% B (does not contain 0 weight ¾>), less than 0.005 wt% (without 0 wt%) and less than 0.025 wt% (with 0 wt%) of Mg, Zr and V, respectively May not be included).

The density is calculated by the following formula 4 can be 7.57 to 7.67g / cm ^3.

[Equation 4]

7.865+ (-0.0611 * [Si] — 0.102 * [Al] + 0.00589 * [Mn])

(However, in formula 4, [Si], [Al] and [Mn] represent the contents (weight%) of Si, Al and Mn, respectively.)

Tensile test elongation may be at least 24%.

The thickness may be 0.10 to 0.35 mm.

Method for producing a non-oriented electrical steel sheet according to an embodiment of the present invention by weight%, Si: 2.5 to 3.3%, A1: 0.05 to 1%, Mn: 0.05 to 1), S: 0.01% or less (0% N: 0.00 or less (Does not contain), C: 0.005% or less (does not contain 0%), Ti: 0.005% or less (does not contain 0%), Nb: 0.005% or less ( 0%), P: 0.001 to 0.1%, Sn: 0.001 to 0., and Sb: 0.001 to 0.1%, the balance includes Fe and inevitable impurities, and the following Formulas 1 to 3 Heating the satisfactory slab and hot rolling to clean the hot rolled sheet; Cold rolling the hot rolled sheet to produce a molten sheet; And recrystallizing annealing the flexible plate.

[Equation 1]

1.7 ^' <[Si] / ([Al] + [Mn]) <2.9

[Equation 2]

50 <13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) 60

(However, [Si], [Al] and [Mn] in the formulas 1 and 2 represent the contents (% by weight) of Si, AΓ and Mn, respectively.) In the step of producing a hot rolled sheet, the slab may be heated to 1100 to 1200 ^° C.

In the step of preparing a hot-rolled sheet it may be hot rolled at finishing temperature of 800 to 1000 ^° C.

It may further comprise the step of manufacturing a hot rolled sheet and annealing at 850 to 115CTC silver.

Slabs contain less than 0.001% by weight of B (does not contain 0% by weight), 0.005% by weight or less of Mg, Zr and V (does not contain 0% by weight) and 0.025% or less of Cu (0% by weight) It does not include)).

The prepared steel sheet has a density which is calculated by the following formula 4 it can be 7.57 to 7.67g / cm ^3.

. [Equation 4]

7.865 + C-0.0611 * [Si] -0. 102 * [A1] + 0.00589 * [Mn])

(However, in formula 4 [Si], [A1] and [Mn] represents the content of Si, A1 and Mn (weight ¾>), respectively.)

The prepared steel sheet may have a tensile test elongation of 24% or more.

In the step of manufacturing the lead plate, the thickness may be between 0.1 and 0.35 mm thickness. 【Effects of the Invention】

Non-oriented electrical steel sheet according to an embodiment of the present invention is excellent in magnetic properties and at the same time excellent in productivity.

[Specific contents to carry out invention]

Terms such as first, second, and third are used to describe various parts, components, regions, layers and / or sections, but are not limited to these. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first portion, component, region, layer or section described below may be referred to as the second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is merely to refer to a specific embodiment. It does not intend to limit the present invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of "comprising" specifies a particular characteristic, region, integer, step, operating element and / or component, and the presence of another characteristic, region, integer, step, operation, square and / or component or It does not exclude the addition.

When a portion is referred to as "on" or "on" another portion, it may be directly on or on the other portion or may be accompanied by another portion therebetween. In contrast, when one part is mentioned "right above" another part, no other part is intervened.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

Also, unless noted otherwise, ¾ means percent increase and lppm is

0.0001% by weight.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The non-oriented electrical steel sheet according to an embodiment of the present invention in weight%, Si: 2.5 to 3.3%, A1: 0.05 to 1%, Mn: 0.05 to 1%, S: 0.01% or less (not including 0%) ), N: 0.005% or less (without OT), C: 0.005% or less (without OT), Ti: 0.005% or less (without 0%), Nb: 0.005% or less ((» P: 0.001 to 0.1%, Sn: 0.001 to 0.1%, and Sb: 0.001 to 0.1%, and the balance includes Fe and unavoidable impurities. First, the reason for component limitation of a non-oriented electrical steel sheet is demonstrated.

Si: 2.5 to 3.3% by weight

Silicon (Si) serves to lower the iron loss by increasing the specific resistance of the material. If too little Si is added, the effect of improving the high frequency iron loss may be insufficient. In addition, when too much Si is added, the brittleness of the material may increase, leading to a sharp decrease in rolling productivity. Therefore, Si can be added in the above range _. have.

A1: 0.05 to 1% by weight

Aluminum (A1) plays a role of lowering iron loss by increasing specific resistance together with Mn. Although the increase in specific resistance is lower than that of Si, the specific resistance can be increased while maintaining the rolling property by adding an appropriate amount. When too little A1 is added, the high frequency iron loss effect is significantly reduced, and finely formed nitrides and sulfides deteriorate the magnetic properties. If too much A1 is added, the magnetic properties or rolling properties may deteriorate rapidly. Therefore, A1 can be added in the above-mentioned range.

Mn: 0.05 to 1 weight%

Manganese (Mn), together with A1 increases the specific resistance to reduce the iron loss. If too little Mn is added, the high frequency iron loss effect is significantly reduced, and finely formed nitrides and sulfides degrade the magnetic properties. If you participate too much Mn. Magnetic properties or rollability may deteriorate rapidly. Therefore, Mn can be added in the above-mentioned range.

S: 0.01% by weight or less

Sulfur (S) is an element inevitably present in the steel to form fine precipitates MnS, CuS and the like to deteriorate the magnetic properties, it is preferable to limit to 0.01% by weight or less, more specifically 0.005% by weight or less.

N: 0.005 weight ¾> or less

Nitrogen (N) not only forms fine and long A1N precipitates in the base material, but also combines with other impurities to form fine nitrides, inhibits grain growth and worsens iron loss, so more specifically, 0.003 wt% or less. It is good to restrict to the following.

C: 0.005% by weight or less Since carbon (c) causes magnetic aging and combines with other impurity elements to form carbides to lower the magnetic properties, the carbon (c) is preferably limited to 0.005 weight or less, more specifically 0.003 weight ¾> or less.

Ti: 0.005 wt% or less, Nb: 0.005 wt% or less

Titanium (Ti) and niobium (Nb) form carbides or nitrides that ^' deteriorate iron loss and promote the development of undesirable {111} textures that are undesirable for magnetism, so they are limited to 0.005% by weight or less, more specifically 0.003% by weight or less Good to do.

P: 0.001 to 0.1 weight%, Sn: 0.001 to 0.1 weight%, and Sb ': 0.001 weight 0.1 weight%

Phosphorus (P), tin (Sn), and antimony (Sb) segregate on the surface and grain boundaries of the steel sheet to suppress surface oxidation during annealing and to suppress recrystallization of the U11} // ND orientation to improve texture. It plays a role. If a small amount of one element is added, the effect is remarkably reduced. If it is added excessively, grain growth is suppressed due to an increase in the amount of grain boundary segregation. It is not preferable because iron loss is deteriorated, the toughness of steel is lowered, and productivity is lowered. In particular, when the total of p, Sn, Sb is limited to the range of 0.025 to 0.15% by weight, the surface oxidation inhibition and texture improvement effect is maximized, the magnetic properties are significantly improved.

Other impurities

In addition to the above-described elements, impurities, such as B, Mg, Λ, V, and Cu, may be included inevitably. Although these elements are trace amounts, they may cause magnetic deterioration through the formation of inclusions in the steel, so they should be controlled to B: 0.001 wt% or less, Mg, Zr, V: 0.005 wt% or less and Cu: 0.025 wt% or less.

Non-oriented electrical steel sheet according to an embodiment of the present invention satisfies the following formula 1 to formula 3.

[Equation 1]

1.7 <[Si] / ([Al] + [Mn]) <2.9

[Equation 2]

50 <13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) <60

[Equation 3] 0.025 <[P] + [Sn] + [Sb] <0.15

(Wherein [Si], [Al], [Mn], [P], [Sn] and [Sb] in the formulas 1 to 3 are the contents of Si, Al, Mn, P, Sn and Sb (weight% ).)

When satisfying the formulas 1 to 3, the magnetic properties and the rollability is excellent at the same time, the magnetic properties or rollability may be rapidly deteriorated outside this range.

The non-oriented electrical steel sheet according to one embodiment of the present invention may have a density calculated by Equation 4 below 7.57 to 7.67 g / cm ³ . If the density is less than 7.5767 g / cm ³ , the magnetic flux density may deteriorate or the rolling property may be sharply lowered. If the density exceeds 7.67 g / cm ³ , the iron loss may be degraded, especially high frequency iron loss. Therefore, the density can be adjusted in the above-described range.

The non-oriented electrical steel sheet according to one embodiment of the present invention may have a tensile test elongation of 24% or more. Year _. If the elongation is less than 24%, the rolling properties may be inferior, resulting in poor productivity. More specifically, the elongation may be 28 to 34%.

Non-oriented electrical steel sheet according to an embodiment of the present invention has a thickness of 0.10 to

It may be 0.35 mm. Method for producing a non-oriented electrical steel sheet according to an embodiment of the present invention by weight%, Si: 2.5 to 3.3%, Al: 0.05 to 1%, Mn: 0.05 to 1%, S: 0.01% or less (0% N: 0.005% or less (does not contain 0%), C: 0.005% or less (does not contain 0¾>), Ti: 0.005% or less (does not contain 0%), Nb: 0.005 % Or less (not including 0%), Ρ: 0.001 to 0.1%, Sn: 0.001 to 0.1%, and Sb: 0.001 to 0.1%, the balance includes Fe and inevitable impurities, and the following formula Manufacturing a hot rolled sheet by heating and heating the slab satisfying Formulas 1 to 3; Rolling the hot rolled sheet to produce a rolled sheet; And recrystallizing annealing the flexible plate. -[Equation 1]

1.7 <[Si] / ([Al] + [Mn]) <2.9

. [Equation 2]

50 <13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) <60 [Equation 3]

0.025 <[P] + [Sn] + [Sb] <0.15

(Wherein [Si], [Al], [Mn], [P], [Sn] and [Sb] in the formulas i to 3 are the contents of Si, Al, Mn, P, Sn and Sb (% by weight) ).)

First, the slab is heated and hot rolled to produce a hot rolled sheet. The reason for limiting the addition ratio of each composition is the same as the reason for limiting the composition of the non-oriented electrical steel sheet described above. Since the composition of the slab does not substantially vary in the processes of hot rolling, hot rolling annealing, hot rolling, recrystallization annealing, and the like, the composition of the slab and the composition of the non-oriented electrical steel sheet are substantially the same.

Charge the slab into a furnace and heat it to 1100 to 1200 ^° C.

The heated slabs are hot rolled to 2 to 2.3 mm to produce hot rolled plates. Finishing temperature in the step of manufacturing a thermal plate may be 800 to 1000 ^° C.

Hot rolled hot rolled sheet is annealed hot rolled sheet at a temperature of 850 to 1150 ^° C. If the hot-rolled sheet annealing temperature is less than 850 ^° C, the structure does not grow or finely grow, so there is little synergistic effect of the magnetic flux density; if the annealing temperature exceeds 1150 ^° C, the magnetic properties deteriorate, and rolling due to the deformation of the plate shape Since workability may deteriorate, the temperature range is limited to 850 to 1150 ^° C. More preferable annealing temperature of the hot rolled sheet is 950 to 115CTC. Hot-rolled sheet annealing is performed to increase the orientation favorable to the magnetic, if necessary, may be omitted. The average grain size after hot-rolled sheet annealing is preferably 120 / m or more. After annealing the hot rolled sheet, the hot rolled sheet is pickled and cold rolled to a predetermined sheet thickness. It may be applied differently depending on the thickness of the hot rolled sheet, by applying a reduction ratio of about 70 to 95% can be cold rolled so that the final thickness is 0.1 to 0.35 瞧.

The final hot rolled cold rolled sheet is subjected to final recrystallization annealing. If the final recrystallization annealing temperature is too low, does not re-crystallization occurs sufficiently layer, since the final recrystallization annealing temperature is too high, it becomes a magnetic flux density and a high-frequency iron loss by rapid growth occurs in the crystal grains to heat, enforcing at a temperature of 850 to 1150 ^° C This is preferred. The recrystallized annealing plate is insulated coated and shipped to the customer. Insulation coating can be organic, inorganic or organic-inorganic composite coating treatment, and other insulating coating can be used. The customer can use this steel plate as it is, and can use it after conducting the spring removal annealing if necessary. Hereinafter, the present invention will be described in more detail with reference to Examples. However, these examples are only for illustrating the present invention, and the present invention is not limited thereto.

Example 1

The slab, as shown in Table 1 below, was heated at 1100 ^° C., and hot-rolled to a finishing temperature of 870 ^° C to prepare a hot rolled plate having a thickness of 2.3 kPa. The hot rolled sheet was annealed at 1060 ^° C. for 100 seconds, pickled, cold rolled to a thickness of 0.35 mm, and subjected to final recrystallization annealing at 1000 ^° C. for 110 seconds. [Si] / ([Al] + [Mn]) values for each specimen, 13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) values, [P] + [Sn] + [Sb ], Density, magnetic flux density (B50), iron loss (W15 / 50), high frequency iron loss (W10 / 400), bending test results and elongation are summarized in Table 2 below.

Density was calculated by the formula of 7.865 + (− 0.0611 * [Si] -0.102 * [Al] + 0.00589 * [Mn]). For magnetic properties such as magnetic flux density, iron loss, and high frequency iron loss, three or more specimens were cut into 60 隱 * 60 隱 size for each specimen, and the magnetic properties in the rolling direction and the vertical direction were measured with a single sheet tester. Averaged measured values are shown. At this time, B50 is the magnetic flux density induced in the magnetic field of 5000A / m, W15 / 50 is the iron loss when the 1.5T magnetic flux density is induced at the frequency of 50Hz, and W10 / 400 is the magnetic flux of 1.0T at the frequency of 400Hz. It means the iron loss when the density is induced. The flexural test was carried out to predict the rolling productivity, and after the hot-rolled sheet annealing, the 2.3 誦 thick specimen was cut into 300 隱 * 35mm 3 and after the close flexural test at room temperature, the cracks on the outer surface and the corner of the flexure were bad. ， If it does not occur, it is represented as good. Elongation showed the value obtained by the tensile test according to J IS No.5 standard.

Table 1

1 * 1

Example comparison

A14 2.30 47.15 0.084 7.687 1.68 2.43 18.9 0 |: ¾

o ϋ 34.8

Examples As shown in Table 1 and Table 2, A4, A5, A7, A8, A10, All, A12 satisfying the conditions of the present invention had excellent magnetic properties, and the flexural test results and the elongation were all good. On the other hand, A3 and A6 whose [Si] / ([Al] + [Mn]) values exceed the range of the present invention are inferior in magnetic properties or poor in flexural test results and elongation, and [Si] / ([ Al] + [Mn]) value is less than the range of the present invention A9, A13 also showed inferior magnetic properties or poor bending test results and elongation. A2 and A14, whose values of 13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) exceed or fall below the range of the present invention, have also been shown to be inferior or inferior in magnetic properties and have poor elongation. . Example 2

Table 3 and the slab composition as shown in Table 4 was heated at 1130 ^° C, hot-rolled to a finishing temperature of 870 ^° C to prepare a hot rolled plate having a thickness of 2.0 kPa. The hot rolled sheet was annealed at 103C C for 100 seconds, pickled, cold rolled to a thickness of 0.35 mm 3, and subjected to final recrystallization annealing at 990 ^° C. for 110 seconds. [Si] / ([Al] + [Mn]) values for each specimen, 13.25 + 11.3 * ([Si] + [Al] + [Mn] / 2) values, [P] + [Sn] + [Sb ], Magnetic flux density (B50) ᅳ iron loss (W15 / 50), high frequency iron loss (W10 / 400), bending test results and elongation are summarized in Table 5 below.

[Table 3]

Si AI n P Sn Sb C S N Specimen No.

(%) (%) (%) (%) (%) (%) (%) (%) (%)

B1 2.90 0.80 0.30 0.032 0.029 0.043 0.0032 0.0012 0.0029

B2 2.90 0.80 0.30 0.012 0.035 0.029 0.0017 0.0011 0.0023

B3 2.90 0.80 0.30 0.009 0.011 0.012 0.0025 0.0019 0.0031

B4 2.90 0.80 0.30 0.032 0.013 0.021 0.0024 0.0034 0.0019 rice plant

Specimen Formula 1 Formula 2 Formula 3 B50 W15 / 50 W10 / 400 Bending

Higher Tension (T) (W / kg) (W / kg) Test

Bl 2.64 56.76 0.104 1.70 1.98 15.3 Good 29.7 Invention example

B2 2.64 56.76 0.076 1.70 2.02 15.4 Good 30.2 Invention example

B3 2.64 56.76 0.032 1.70 1.99 15.2 Good 29.9 Invention example

B4 2.64 56.76 0.066 1.66 2.14 16.9 (： 28.9 Comparative Example

B5 2.64 56.76 0.073 1.67 2.20 17.1 Good 30.7 Comparative example

B6 2.64 56.76 0.089 1.67 2.15 17.0 Good 30.2 Comparative example

B7 2.64 56.76 0.018 1.66 2.14 17.4 Good 31.1 Comparative Example

CI 2.16 53.37 0.105 1.71 2.03 15.9 Good 31.2 Invention example

C2 2.16 53.37 0.067 1.71 2.01 15.6 Good 30.1 Invention example

C3 2.16 53.37 0.076 1.71 2.01 15.7 Good 30.2 Invention example

C4 2.16 53.37 0.103 1.67 2.19 17.9 Good 30.9 Comparative example

C5 2.16 53.37 0.084 1.68 2.18 17.7 Good 29.8 Comparative example

C6 2.16 53.37 0.137 1.68 2.24 18.1 31.3 Comparative Example

C7 2.16 53.37 0.172 1.67 2.19 18.0 17.2 Comparative Example As shown in Table 5, B1, Β2, Β3, CI, C2, and C3, which are within the scope of the present invention, showed excellent magnetic properties and good bending test results. On the other hand, Β4, Β5, Β6, C4, C5, C6 have inferior magnetic properties because the content of one or more of Β, Mg, Zr, V, Cu exceeds the scope of the present invention. B7 is inferior to the magnetic properties because the sum of the P, Sn, Sb component content is less than the scope of the present invention, C7 is not only Mg component, but also the sum of the P, Sn, Sb component content also exceeds the scope of the present invention Inferior magnetic properties were also inferior to the flexural test results and elongation. The present invention is not limited to the embodiments can be manufactured in a variety of different forms, those skilled in the art to which the present invention pertains to other specific forms without changing the technical spirit or essential features of the present invention It will be appreciated that it may be practiced. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

【Claim】【Claim 1】 By weight %, Si: 2.5 to 3.3¾, Al: 0.05 to 1%, Mn: 0.05 to 1%, S: 0.01% or less (not including 0%), N: 0.005 % or less (does not include 0%), C: 0.005% or less (does not include OT), Ti: 0.005% or less (does not include OT), Nb: 0.005% or less (does not include 0%) , P: 0.001 to 0.1%, Sn: 0.001 to 0.1%, and Sb: 0.001 to 0.1%, the balance includes Fe and inevitable impurities, and satisfies the following Equations 1 to 3. [Equation 1]

1.7<[Si]/([Al] + [Mn])<2.9

[Equation 2]

50<13.25+11.3*([Si] + [Al] + [Mn]/2)<60

[Equation 3]

0.025 < [P]+[Sn]+[Sb] < 0.15

(However, in Equations 1 to 3, [Si], [Al], [Mn], [P], [Sn], and [Sb] are the contents of Si, Al, Mn, P, Sn, and Sb, respectively (% by weight) ).)

【Claim 2】

In clause 1,

B is 0.001% by weight or less (does not include 0% by weight), Mg, Zr and V are each 0.005% by weight or less (does not include 0% by weight), and Cu is 0.025% by weight or less (does not include 0% by weight) Non-oriented electrical steel sheet that further includes (does not apply).

【Claim 3】

In paragraph 1,

A non-oriented electrical steel sheet with a density of 7.57 to 7.67 g/cm ³ calculated by Equation 4 below.

[Equation 4]

7.865+(-0.0611* [Si ] -0.102* [Al ]+0.00589* [Mn] )

(However, in Equation 4, [Si], [Al], and [Mn] represent the contents (weight ¾>) of Si, Al, and Mn, respectively.) [Claim 4]

In clause 1,

Non-oriented electrical steel sheet with a tensile test elongation of 24% or more.

【Claim 5】

In paragraph 1,

Non-oriented electrical steel sheet with a thickness of 0.10 to 0.35 睡.

【Claim 6】

By weight %, Si: 2.5 to 3.3%, A1: 0.05 to 1%, Mn: 0.05 to 1%, S: 0.01% (does not include 0%), N: 0.005% or less (does not include 0%) (does not include), C: 0.005% or less (does not include), Ti: 0.005% or less (does not include 0%), Nb: 0.005% or less ((does not include »), P: 0.001 to 0.1%, Sn: 0.001 to 0.1%, Sb: 0.001 to 0.1%, the balance contains Fe and inevitable impurities, and the slab satisfying the following formulas 1 to 3 is heated and then hot rolled to produce a hot rolled sheet. step;

Manufacturing a nap-rolled plate by rolling the hot-rolled plate; and

A method of manufacturing a non-oriented electrical steel sheet comprising the step of recrystallization annealing the nap soft plate.

[Equation 1]

1.7<[Si]/([Al] + [Mn])<2.9

[Equation 2]

50<13.25+11.3*([Si] + [Al] + [Mn]/2)<60

[Equation 3]

0.025 < [P] + [Sn] + [Sb] < 0.15

(However, in Formulas 1 to 3, [Si], [Al], [Mn], [P], [Sn], and [Sb] are the contents of Si, Al, Mn, P, Sn, and Sb, respectively (weight ¾ >).)

【Claim 7】

In paragraph 6,

In the step of manufacturing the hot-rolled sheet, a method of manufacturing a non-oriented electrical steel sheet in which the slab is heated to 1100 to 120 CTC.

【Claim 8】 In clause 6,

In the step of manufacturing the hot rolled sheet, a method of manufacturing a non-oriented electrical steel sheet by hot rolling at a finishing temperature of 800 to iooo ^° c.

【Claim 9】

In clause 6,

A method of manufacturing a non-oriented electrical steel sheet further comprising the step of manufacturing a hot-rolled sheet and annealing it at a temperature of 850 to 1150 ^° C.

[Claim 10]

In clause 6,

The slab is B. 0.001% by weight or less (does not include 0% by weight)，

A method of manufacturing a non-oriented electrical steel sheet further comprising 0.005% by weight or less of Mg, Zr, and V (not including 0% by weight) and 0.025% by weight or less of Cu (not including 0% by weight).

【Claim Hi

In paragraph 6,

The manufactured steel sheet has a density of 7.57 to 7.67 g/cm ³ calculated by Equation 4 below. Method for manufacturing a non-oriented electrical steel sheet.

[Equation 4]

7.865+ (-0.0611* [Si ]-0. 102* [Α1 ]+0.00589* [Mn] )

(However, in Equation 4, [Si], [A1], and [Mn] represent the contents (% by weight) of Si, A1, and Mn, respectively.)

【Claim 12】

In clause 6,

The manufactured steel sheet was manufactured using a method for manufacturing non-oriented electrical steel sheets with a tensile test elongation of 24% or more.

[Claim 13]

In clause 6,

In the step of manufacturing the flat plate, a method of manufacturing a non-oriented electrical steel sheet that is rolled to a thickness of 0.10 to 0.35 mm.