KR100268853B1 - The manufacturing method of non oriented electric steel sheet with excellent magnetic properties - Google Patents
The manufacturing method of non oriented electric steel sheet with excellent magnetic properties Download PDFInfo
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- KR100268853B1 KR100268853B1 KR1019960070024A KR19960070024A KR100268853B1 KR 100268853 B1 KR100268853 B1 KR 100268853B1 KR 1019960070024 A KR1019960070024 A KR 1019960070024A KR 19960070024 A KR19960070024 A KR 19960070024A KR 100268853 B1 KR100268853 B1 KR 100268853B1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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Abstract
Description
[발명의 명칭][Name of invention]
열연판의 산세성과 자성이 우수한 무방향성 전기강판의 제조 방법Manufacturing method of non-oriented electrical steel sheet excellent in pickling and magnetic properties of hot rolled sheet
[발명의 상세한 설명]Detailed description of the invention
[발명의 목적][Purpose of invention]
[발명이 속하는 기술분야 및 그 분야의 종래기술][Technical field to which the invention belongs and the prior art in that field]
본 발명은 각종 모터, 변압기 및 안정기 등의 전기기기의 철심으로 사용되는 무방향성 전기강판의 제조방법에 관한 것으로, 보다 상세하게는 열연판의 산세성과 자성이 우수한 무방향성 전기강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a non-oriented electrical steel sheet used as an iron core of electrical equipment such as various motors, transformers and ballasts, and more particularly to a method for manufacturing a non-oriented electrical steel sheet excellent in pickling and magnetic properties of hot rolled sheet will be.
무방향성 전기강판의 철손은 이력손실과 와류손실로 구분할 수 있으며, 낮은 것이 바람직하다. 와류손실은 소재의 Si 과 Al 등의 성분과 제품의 두께에 의해서 대부분 결정되며, 이력손실은 소재의 제조방법에 의해서 결정된다. 그리고 이력손실이 전체손실의 60 % 이상을 차지하고 있으므로 적절한 제조방법에 의하여 이러한 이력손실을 줄이는 것이 원가를 절감하고 소재의 특성을 향상시킬 수 있는 최적의 방법이 될 수 있다.Iron loss of non-oriented electrical steel sheet can be classified into hysteresis loss and eddy current loss. Vortex losses are largely determined by the components, such as Si and Al, and the thickness of the product, and hysteresis losses are determined by the method of manufacturing the material. And since hysteresis loss accounts for more than 60% of total loss, reducing such hysteresis loss by appropriate manufacturing method can be the best way to reduce cost and improve material characteristics.
[발명이 이루고자 하는 기술적 과제][Technical problem to be achieved]
종래의 무방향성 전기강판은 Si과 Al을 다량 첨가하여 이력손실을 줄이거나 대한민국 특허출원 제 92-18617 호와 같이 미량의 원소를 첨가하여 Si 함량을 낮추는 방법을 사용하여 왔으나, 미량으로 첨가되는 원소는 열연판의 산세성을 저하시켜서 공장의 장애 요인이 되어왔다. 즉 미량의 원소 첨가량은 첨가 원소의 영향외에 열연판을 권취시 600℃ 이상으로 권취함으로써 열연판 표면에 마그네타이트가 형성됨으로써 산세가 어려웠다.Conventional non-oriented electrical steel sheet has been used to reduce the hysteresis loss by adding a large amount of Si and Al or to lower the Si content by adding a small amount of elements, such as Korean Patent Application No. 92-18617, Has deteriorated the pickling properties of hot rolled plates and has been a factor in the factory. That is, a small amount of element addition was difficult to pickling because magnetite was formed on the surface of the hot rolled sheet by winding the hot rolled sheet at 600 ° C. or higher in addition to the influence of the added element.
따라서, 본 발명은 상기 설명한 바와 같은 종래의 무방향성 전기강판제조 방법의 문제를 해결하기 위하여 이루어진 것으로, 미량의 원소인 Sn, Ni 및 Cu 가 함유된 무방향성 전기강판의 열간압연후 권취시 권취온도를 600℃ 이하로 낮추어서 열연판내에 열간압연후의 잔류응력을 많이 보유하고 열연판 소둔을 실시함으로써 결정립을 크게 하여 자성을 향상시킬 수 있으며, 열연 권취온도를 낮춤으로써 열연판의 산화층의 두께를 얇게 하고, 산세성이 우수한 무방향성 전기강판을 제조하는 방법을 제공하는 것을 목적으로 한다.Accordingly, the present invention has been made to solve the problem of the conventional non-oriented electrical steel sheet manufacturing method as described above, the coiling temperature during hot rolling after the hot rolling of the non-oriented electrical steel sheet containing trace elements Sn, Ni and Cu By lowering the temperature to below 600 ℃, it retains much of the residual stress after hot rolling in the hot rolled sheet and performs the hot rolled sheet annealing to increase the grain size and improve the magnetism. By lowering the hot rolling temperature, the oxide layer of the hot rolled sheet is thinned. It is an object of the present invention to provide a method for producing a non-oriented electrical steel sheet having excellent pickling properties.
[발명의 구성 및 작용][Configuration and Function of Invention]
상기 목적을 달성하기 위하여 본 발명에서는, 중량 % 로, C:0.02 % 이하, Si:3.5 % 이하, Mn:0.5 % 이하, P:0.15 % 이하, S:0.015 % 이하, Al:0.7 % 이하, N:0.007 % 이하, Sn:0.03-0.3 %, Ni:0.05-0.7 %, Cu:0.03-0.5 %, 잔부 Fe 및 기타 불가피하게 첨가되는 불순물로 조성되는 강슬라브를 가열로에 넣어 1100-1300℃ 로 재가열하고, 열간압연후 열연판을 500-600℃ 로 권취하고, 850-1100℃ 로 소둔 및 산세한 다음 냉간압연후, 재결정 온도인 700℃ 이상의 온도에서 가열속도가 5∼10℃/초로 가열하여 800-1100℃ 로 소둔하는 것을 특징으로 하는 열연판의 산세성과 자성이 우수한 무방향성 전기강판의 제조방법을 제공한다.In order to achieve the above object, in the present invention, by weight%, C: 0.02% or less, Si: 3.5% or less, Mn: 0.5% or less, P: 0.15% or less, S: 0.015% or less, Al: 0.7% or less, N: 0.007% or less, Sn: 0.03-0.3%, Ni: 0.05-0.7%, Cu: 0.03-0.5%, balance Fe and steel slabs composed of other inevitable impurities are added to the furnace to 1100-1300 ℃ After reheating and hot rolling, the hot rolled sheet is wound to 500-600 ° C, annealed and pickled at 850-1100 ° C, and after cold rolling, the heating rate is heated to a temperature of 5 ° C to 10 ° C / sec. It provides a method for producing a non-oriented electrical steel sheet having excellent pickling and magnetic properties of the hot rolled sheet characterized in that the annealing at 800-1100 ℃.
이하에서는 양호한 실시예와 관련하여 본 발명의 열연판의 산세성과 자성이 우수한 무방향성 전기강판의 제조방법을 상세히 설명한다.Hereinafter, a method of manufacturing a non-oriented electrical steel sheet having excellent pickling properties and magnetic properties of the hot rolled sheet according to the present invention will be described in detail.
본 발명에서는, 우성 중량 % 로, C:0.02 % 이하, Si:3.5 % 이하, Mn:0.5 % 이하, P:0.15 % 이하, S:0.015 % 이하, Al:0.7 % 이하, N:0.007 % 이하, Sn:0.03-0.3 %, Ni:0.05-0.7 %, Cu:0.03-0.5 %, 잔부 Fe 및 기타 불가피하게 첨가되는 불순물로 조성되는 강슬라브를 가열로에 넣어 1100-1300℃ 로 재가열한다.In the present invention, in the dominant weight%, C: 0.02% or less, Si: 3.5% or less, Mn: 0.5% or less, P: 0.15% or less, S: 0.015% or less, Al: 0.7% or less, N: 0.007% or less , Sn: 0.03-0.3%, Ni: 0.05-0.7%, Cu: 0.03-0.5%, balance Fe and steel slabs composed of other inevitable impurities are added to a heating furnace and reheated to 1100-1300 ° C.
이어서, 강슬라브를 열간압연후 열연판을 500-600℃ 로 권취하고, 850-1100℃ 로 소둔 및 산세한 다음 냉간압연한다.Subsequently, after hot rolling of the steel slab, the hot rolled sheet is wound to 500-600 ° C., annealed and pickled at 850-1100 ° C., and then cold rolled.
이후, 재결정 온도인 700℃ 이상의 온도에서 가열속도가 5∼10℃/초로 가열하여 800-1100℃ 로 소둔한다.Thereafter, the heating rate is heated at a temperature of 700 ° C. or more, which is a recrystallization temperature, at a temperature of 5 to 10 ° C./sec and annealed to 800-1100 ° C.
이하에서 본 발명에서의 조성 성분 및 수치 한정 이유에 대하여 설명한다.Hereinafter, the compositional component and the reason for numerical limitation in this invention are demonstrated.
본 발명의 강의 조성에 있어서 C 의 함유량이 많아지면 철손이 증가하며 자기시효를 일으키기 때문에 0.02 % 이하로 한정하는 것이 바람직하며, 최종 제품에서 C 가 0.003 % 이하가 되도록 탈탄소둔을 할 수 있다.In the composition of the steel of the present invention, when the C content increases, iron loss increases and causes self aging, so it is preferable to limit it to 0.02% or less, and decarbonization can be performed so that C is 0.003% or less in the final product.
Si는 강의 비저항을 증사시켜 와류손을 감소시켜 철손을 낮게 할 수 있으나 3.5 %를 초과할 경우 냉간 압연성이 나빠지므로, 3.5 % 이하로 한정하는 것이 바람직하다.Si can increase the specific resistance of the steel to reduce the vortex loss to lower the iron loss, but if it exceeds 3.5%, cold rolling is worse, it is preferable to limit to less than 3.5%.
Mn은 과다 첨가시 집합조직이 열화될 수 있으므로 0.5 % 이하로 한정하는 것이 바람직하다.Mn is preferably limited to 0.5% or less because the texture may deteriorate when excessively added.
P는 타발 작업성을 개선할 수 있으나 Si 및 Al 등의 합금원소의 함유량이 많은 경우 P의 양이 많아지면 취성이 커지므로 0.10 % 이하로 한정하는 것이 바람직하다.P can improve the punching workability, but when the content of alloying elements such as Si and Al is large, brittleness increases as the amount of P increases, so P is preferably limited to 0.10% or less.
Al 은 Si와 같이 강에 함유되면 비저항을 증가시키나 가격이 비싸고 함량이 많아지면 철손은 개선되나 자속밀도를 저하시킬 수 있으므로 최대 0.7 % 까지 첨가하는 것이 바람직하다.When Al is contained in steel, such as Si, the specific resistance is increased, but if the price is high and the content is high, iron loss is improved, but the magnetic flux density may be lowered, so it is desirable to add up to 0.7%.
N은 Al과 결합하여 AlN을 형성시키거나 단독적으로는 침입형 원소로서 결정립 성장을 방해하므로 최소화하여야 하며, 0.007 % 이하로 제한하는 것이 바람직하다.N is combined with Al to form AlN or alone as an invasive element to prevent grain growth, and should be minimized, preferably limited to 0.007% or less.
Sn은 강중 집합조직을 개선하여 자기적 특성을 개선하는 원소이나 양이 증가하면 강의 취성이 커지므로 0.3 % 이하로 제한하는 것이 바람직하다.Sn is preferably limited to 0.3% or less since the brittleness of the steel increases as the amount of elements or the amount of improving the magnetic properties of the steel improves the magnetic properties.
Ni은 Sn과 같은 역할을 하나 원재료 가격이 비싸고 너무 많이 첨가하면 강의 기계적 특성이 열화하므로 0.7 % 이하로 제한하는 것이 바람직하다.Ni plays the same role as Sn, but if the raw material is expensive and too much is added, the mechanical properties of the steel deteriorate, so it is desirable to limit it to 0.7% or less.
Cu은 Sn과 같은 역할을 하나 원재료 가격이 비싸고 너무 많이 첨가하면 강의 기계적 특성이 열화하므로 0.5 % 이하로 제한하는 것이 바람직하다.Cu plays the same role as Sn, but if the raw material is expensive and added too much, the mechanical properties of the steel deteriorate, so it is desirable to limit it to 0.5% or less.
상기와 같이 조성되는 무방향성 전기강판 제조용 강슬라브를 열간압연전 재가열로에 장입하여 1100∼1300℃로 재가열한 후 열간압연한 다음 권취한다. 이때 재가열온도가 1100℃ 미만일 경우 목표로 하는 열연 후면 온도를 확보할 수 없으며 압연력이 커지므로 열연판 두께 및 폭의 제어가 어려워 제품화가 불가능하며, 1300℃를 초과하는 경우에는 MnS 또는 AlN 등의 재고용에 의해 열간압연후 미세한 석출물의 형성으로 인하여 소둔시 결정립 성장이 방해되어 자성이 열화되므로, 상기 슬라브 재가열온도는 1100∼1300℃로 제한하는 것이 바람직하다.The steel slab for producing non-oriented electrical steel sheet prepared as described above was charged to a reheating furnace before hot rolling, reheated to 1100 to 1300 ° C., and then hot rolled. At this time, if the reheating temperature is less than 1100 ℃, the target hot rolled back temperature cannot be secured, and the rolling force increases, making it difficult to control the thickness and width of the hot rolled steel plate, making it impossible to commercialize it. Due to the formation of fine precipitates after hot rolling, grain growth is hindered during annealing due to the formation of fine precipitates, so that the slab reheating temperature is preferably limited to 1100 to 1300 ° C.
열간압연의 사상압연시 마무리 압연온도는 오스테나이트상과 페라이트상에서 가능하며, Si 함량이 낮은 강은 오스테나이트상이 유리한테, 압연중 상변태가 없어서 판두께가 균일하기 때문이다. 그러나 Si이 많은 강은 상변태 구역이 없어서 페라이트상에서 압연되어진다.The finish rolling temperature during hot rolling of hot rolling is possible in the austenitic and ferritic phases, and the steel having a low Si content is uniform in the austenitic phase because the plate has no phase transformation during rolling. However, Si-rich steel is rolled on ferrite because there is no phase transformation zone.
권취온도는 500∼600℃로 한다. 이 보다 높은 온도에서는 열연판 표면에 산세가 어려운 산화물인 마그네타이트가 발생되고 동시에 다음과 같은 인자가 추가됨으로써 산세가 어렵기 때문이다. 즉, 자기적 특성을 향상시키기 위해 소량 첨가되는 Sn, Ni, Cu는 열연판 표면에 농축되어 있는데, 산세시 염산 등의 산용액과의 반응이 어렵기 때문이다. 또한 이들 산화층을 벗겨 내었다 하더라도 소재의 표면직하에 있는 소재의 원소중 산소와 반응하기 쉬운 Al, Mn 및 Si이 산화물을 형성하여 표층하 산화물을 형성하기 때문이다. 따라서 본 발명의 강에서는 권취온도는 500∼600℃로 제한하는 것이 바람직하다. 또한 열연판내 잔류응력을 크게 함으로써 열연판 소둔시 결정립 성장을 크게 하는 효과를 얻는 목적으로서도 권취 온도는 상기와 같이 제한하는 것이 바람직하다.Winding temperature shall be 500-600 degreeC. This is because at higher temperatures, magnetite, an oxide that is difficult to pickle, is generated on the surface of the hot-rolled sheet, and at the same time, pickling is difficult by adding the following factors. That is, Sn, Ni, and Cu added in small amounts to improve magnetic properties are concentrated on the surface of the hot rolled plate, because it is difficult to react with an acid solution such as hydrochloric acid during pickling. This is because Al, Mn, and Si, which are easily reacted with oxygen in the elements of the material directly below the surface of the material, form an oxide to form an oxide under the surface layer even if these oxide layers are peeled off. Therefore, in the steel of this invention, it is preferable to limit winding temperature to 500-600 degreeC. In addition, the winding temperature is preferably limited as described above to obtain the effect of increasing the grain growth during the annealing of the hot rolled sheet by increasing the residual stress in the hot rolled sheet.
상기와 같은 열간압연된 열연판은 850∼1100℃의 온도에서 열연판 소둔을 실시한다. 이때 소둔온도가 850℃ 미만인 경우는 결정립 성장이 불충분하며, 1100℃를 초과하는 경우에는 판의 표면 결함이 과다해지므로 상기 소둔온도는 850∼1100℃로 제한하는 것이 바람직하다.The hot rolled hot rolled sheet as described above is subjected to hot rolled sheet annealing at a temperature of 850 ~ 1100 ℃. In this case, when the annealing temperature is less than 850 ° C., grain growth is insufficient. When the annealing temperature is above 1100 ° C., the surface defects of the plate become excessive, so the annealing temperature is preferably limited to 850 to 1100 ° C.
열연판소둔을 행한 후 통상의 방법으로 산세작업을 실시하고 목표 제품 두께로 냉간압연을 실시하여 냉간압연판의 C의 함량이 0.008 % 이상인 경우에는 냉연판 소둔전에 이슬점을 10∼50℃로 하여 질소와 수소의 혼합 분위기에서 탈탄을 실시할 수 있으며 통상적으로 10분 이하의 시간동안 최종소둔을 행한다. 이때 강중 재결정이 성장이 시작되는 750℃ 에서부터 균열온도까지의 승온 속도를 5∼20℃/초로 제한 하는데, 이는 승온속도를 증가시키는 경우 자기적 특성을 향상시키는 집합조직인 (001),(110) 등의 면 강도가 크게 되므로 목적으로 하는 자기적 특성을 확보 할 수 있고, 20℃/초를 초과시키는 경우 로의 열원을 초대형화하여야 하므로 설비 구성이 불가능해지므로 제한하는 것이 바람직하다. 상기 냉간압연은 중간소둔을 포함하는 2회 냉간압연을 포함한다.After hot-rolled sheet annealing, pickling is carried out by the usual method, and cold rolling is performed to the target product thickness. If the C content of the cold-rolled sheet is 0.008% or more, the dew point is set to 10 to 50 ° C prior to cold-rolled sheet annealing. Decarburization can be carried out in a mixed atmosphere of hydrogen and hydrogen, and the final annealing is usually carried out for a time of 10 minutes or less. At this time, the recrystallization in the steel is limited to the temperature increase rate from 5 to 20 ℃ / second from 750 ℃ to the start of the growth temperature, which is (001), (110), etc., which improves the magnetic properties when increasing the temperature increase rate It is desirable to limit the surface strength of the furnace because it is possible to secure the desired magnetic properties, and if the heat source of the furnace is exceeded 20 ° C / sec, the facility configuration becomes impossible because the heat source of the furnace must be supersized. The cold rolling includes two cold rolling including intermediate annealing.
이하 실시예를 통하여 본발명을 보다 구체적으로 설명한다.The present invention will be described in more detail with reference to the following Examples.
[실시예 1]Example 1
중량 % 로, C:0.004%, Si:2.5%, Mn:0.23%, P:0.01%, S:0.004%, Al:0.36%, N:0.003%, Sn:0.13 %, Ni:0.10%, Cu:0.12%, 잔부 Fe 및 기타 불가피하게 첨가되는 불순물로 조성되는 강슬라브를 가열로에 장입한후 1200℃로 가열한후 열간압연하고 발명강은 550℃에서 권취하여 열연판을 제조하고, 비교재는 700℃에서 권취하여 열연판을 제조하였다. 열연판소둔을 발명강 및 비교재 공히 1050℃에서 3분간 행하였다. 상기와 같이 열처리한 열연판은 10 % 의 염산용액에서 산세를 거친후, 2.0 mm 두께에서 0.5 mm 두께로 냉간압연하고 자기적인 특성을 최종적으로 확보하기 위한 고온소둔을 1050℃에서 2분간 수소 25% 질소 75%의 분위기중에서 표 1과 같이 행하였다. 상기와 같이 제조된 무방향성 전기강판의 시편에 대하여 엡스타인 자성 측정기로 자기적 특성을 측정하고 표 1에 나타내었다.By weight%, C: 0.004%, Si: 2.5%, Mn: 0.23%, P: 0.01%, S: 0.004%, Al: 0.36%, N: 0.003%, Sn: 0.13%, Ni: 0.10%, Cu The steel slab composed of 0.12%, balance Fe and other inevitably added impurities is charged into a heating furnace, heated to 1200 ° C, hot rolled, and the inventive steel is wound up at 550 ° C to produce a hot rolled plate. It was wound up at 700 ℃ to prepare a hot rolled sheet. Hot-rolled sheet annealing was performed at 1050 ° C. for 3 minutes for both the inventive steel and the comparative material. The hot rolled plate subjected to the heat treatment as described above is subjected to pickling in a 10% hydrochloric acid solution, and then cold rolled from 2.0 mm to 0.5 mm in thickness and 25% hydrogen at 1050 ° C. for 2 minutes at high temperature to finally secure magnetic properties. It carried out as Table 1 in 75% nitrogen atmosphere. The magnetic properties of the non-oriented electrical steel sheet prepared as described above were measured by an Epstein magnetic meter and are shown in Table 1.
상기 표 1에 나타난 바와 같이 본발명에 부합되는 열연 권취온도, 열연판소둔조건 및 냉연판 소둔시 승온속도 조건에서 산세 상태 및 자기적 특성이 비교재와 대비하여 우수함을 알 수 있다. 자기적 특성이 우수한 것은 냉연판소둔시 승온속도를 발명의 조건으로 작업함으로써 자기적 특성에 유리한 집합조직의 강도를 크게 하였으며, 따라서 비교재 대비 우수한 특성을 얻을 수 있었다.As shown in Table 1, it can be seen that the pickling state and the magnetic properties are excellent in comparison with the comparative material in the hot rolling temperature, the hot rolled sheet annealing condition and the temperature rising rate condition in the cold rolled sheet annealing according to the present invention. The excellent magnetic properties by increasing the temperature of the cold rolled sheet annealing in accordance with the conditions of the invention to increase the strength of the texture, which is advantageous to the magnetic properties, and thus excellent properties compared to the comparative material.
[실시예 2]Example 2
중량%로, C:0.005%, Si:0.55%, Mn:0.28%, P:0.05%, S:0.005%, Al:0.27%, N:0.003%, Sn:0.1%, Ni:0.25%, Cu:0.22%, 잔부 Fe 및 기타 불가피하게 첨가되는 불순물로 조성되는 강슬라브를 가열로에 장입후 1180℃로 가열후 열간압연의 마무리 압연시 오스테나이트상에서 열간압연하고 열연판 권취온도를 400℃, 500℃, 600℃ 및 700℃로 하여 공기중에 냉각하였다. 열연판소둔은 발명강 및 비교재 공이 950℃에서 3분간 행하였다. 냉각된 열연판은 1000℃에서 5분간 소둔후 15%의 염산용액에서 산세를 거친후 2.0mm 두께에서 0.5mm 두께로 냉간압연하였다. 자기적인 특성을 최종적으로 확보하기 위한 고온소둔을 1000℃에서 2분간 수소 20% 질소 80%의 분위기중에서 표 1과 같은 조건으로 행하였다. 이와 같이 제조된 무방향성 전기강판의 시편에 대하여 엡스타인 자성측정기로 자기적 특성을 측정하고 그 결과를 표 2에 나타내었다.By weight%, C: 0.005%, Si: 0.55%, Mn: 0.28%, P: 0.05%, S: 0.005%, Al: 0.27%, N: 0.003%, Sn: 0.1%, Ni: 0.25%, Cu : 0.22%, remainder Fe and other unavoidably added impurities, steel slab is charged into the furnace and heated to 1180 ℃, hot rolled on austenite and hot rolled sheet winding temperature 400 ℃, 500 It cooled in air at the temperature of 600 degreeC, and 700 degreeC. Hot-rolled sheet annealing was performed for 3 minutes at 950 ° C by the inventive steel and the comparative material ball. The cooled hot rolled sheet was annealed at 1000 ° C. for 5 minutes, pickled in 15% hydrochloric acid solution, and cold rolled from 2.0 mm to 0.5 mm thick. The high temperature annealing to finally secure the magnetic properties was performed under conditions as shown in Table 1 in an atmosphere of 20% hydrogen and 80% hydrogen for 2 minutes at 1000 ° C. The magnetic properties of the non-oriented electrical steel sheet thus prepared were measured by an Epstein magnetometer, and the results are shown in Table 2.
[발명의 효과][Effects of the Invention]
따라서, 상기 설명한 바와 같은 본 발명의 열연판의 산세성과 자성이 우수한 무방향성 전기 강판의 제조 방법에 의하면, 미량의 원소인 Sn, Ni 및 Cu 가 함유된 무방향성 전기강판의 열간압연후 권취시 권취온도를 600℃ 이하로 낮추어서 열연판내에 열간압연후의 잔류응력을 많이 보유하고 열연판 소둔을 실시함으로써 결정립을 크게 하여 자성을 향상시킬 수 있으며, 열연 권취온도를 낮춤으로써 열연판의 산화층의 두께로 얇게 하고, 산세성이 우수한 무방향성 전기강판을 제조할 수 있다.Therefore, according to the manufacturing method of the non-oriented electrical steel sheet excellent in pickling and magnetic properties of the hot-rolled sheet of the present invention as described above, the winding during hot rolling of the non-oriented electrical steel sheet containing trace elements Sn, Ni and Cu By lowering the temperature below 600 ℃, it retains much of the residual stress after hot rolling in the hot rolled sheet and performs the hot rolled sheet annealing to increase the grain size and improve the magnetism. By lowering the hot rolling temperature, the thickness of the oxide layer of the hot rolled sheet is thinned. And it is possible to manufacture a non-oriented electrical steel sheet excellent in pickling properties.
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