WO2016105055A1 - Tôle d'acier électrique à grains orientés et procédé permettant la production de cette dernière - Google Patents

Tôle d'acier électrique à grains orientés et procédé permettant la production de cette dernière Download PDF

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Publication number
WO2016105055A1
WO2016105055A1 PCT/KR2015/014036 KR2015014036W WO2016105055A1 WO 2016105055 A1 WO2016105055 A1 WO 2016105055A1 KR 2015014036 W KR2015014036 W KR 2015014036W WO 2016105055 A1 WO2016105055 A1 WO 2016105055A1
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WIPO (PCT)
Prior art keywords
groove
steel sheet
electrical steel
depth
grain
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PCT/KR2015/014036
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English (en)
Korean (ko)
Inventor
권오열
이원걸
홍성철
이규택
박종태
임충수
Original Assignee
주식회사 포스코
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Priority claimed from KR1020150177394A external-priority patent/KR101719231B1/ko
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to PL15873582T priority Critical patent/PL3239325T3/pl
Priority to US15/539,960 priority patent/US10815545B2/en
Priority to JP2017533470A priority patent/JP6496412B2/ja
Priority to EP15873582.9A priority patent/EP3239325B1/fr
Priority to CN201580070962.7A priority patent/CN107109512B/zh
Publication of WO2016105055A1 publication Critical patent/WO2016105055A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C23C8/18—Oxidising of ferrous surfaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • It relates to a grain-oriented electrical steel sheet and a method of manufacturing the same.
  • a grain-oriented electrical steel sheet is used as an iron core material for electrical equipment such as transformers, and a steel sheet having low magnetic loss and high magnetic flux density is required to reduce power loss and improve efficiency of electrical equipment.
  • oriented electrical steel sheet refers to a material having a Goss Texture oriented in the ⁇ 110 ⁇ ⁇ 001> direction with respect to the rolling direction through hot rolling, cold rolling and annealing.
  • the ⁇ 110 ⁇ ⁇ 001> orientation has better magnetic properties as the degree of iron orientation in the biaxial direction of magnetization increases.
  • the process for producing a grain-oriented electrical steel sheet is first made of steel slab (s l ab) having the composition necessary for the electrical steel sheet, the slab (s l ab) is heated and then hot-rolled to produce a hot rolled steel sheet.
  • This hot rolled steel sheet is then optionally subjected to hot-rolled sheet annealing as needed, followed by one or several times as necessary to produce a cold rolled steel sheet having the required thickness.
  • the cold rolled steel sheet is subjected to decarbonization and optionally nitriding treatment and then subjected to high temperature annealing (also called final annealing or secondary recrystallization annealing) with annealing separator applied.
  • the planarization annealing is optionally performed to correct the shape of the steel sheet. And before or after the planarization annealing is carried out tension coating as necessary to give tension to the steel sheet.
  • tension coating is also referred to as an insulation coating when an inorganic coating liquid or an organic-inorganic composite coating liquid is applied to the surface of a steel sheet and subjected to baking to form a thin insulating film on the surface of the steel sheet.
  • the grain size of the grain-oriented electrical steel sheet is reduced to reduce the width of the magnetic domain.
  • the magnetic micronization method forms a linear groove on the surface of an electrical steel sheet by physical means.
  • Physical methods for forming such grooves include an etching method and a roll method, but laser irradiation is preferred.
  • This method of micronization maintains micronization even after stress relief annealing. According to the presence or absence, it can be classified into temporary and small sized fine permanentization.
  • Permanent domain refining method of forming a groove by laser irradiation can be carried out in the intermediate or later stages of the process for producing electrical steel sheet. That is, after the final cold rolling, grooves may be formed before or after decarburization annealing, before or after coarsening annealing, or before or after planar annealing.
  • the permanent magnetization method by a laser uses a method of irradiating a high power laser to a surface of an electrical steel sheet moving at a high speed and forming a groove accompanying melting of the base by laser irradiation.
  • the lasers used here include Q-switch or pull lasers and continuous wave lasers.
  • the permanent magnetization method using a laser forms deep grooves with melting, it is necessary to minimize the laser energy density when forming the grooves. That is, by minimizing the laser energy density required for groove formation, linear grooves can be formed at high speed with lower laser power.
  • the magnetic flux density deterioration is large in the area irradiated with the laser on the surface of the steel sheet because of the large heat effect near the groove.
  • One embodiment of the present invention is to provide a grain-oriented electrical steel sheet having a linear groove with a relatively low energy density and excellent iron loss improvement characteristics even after laser irradiation.
  • Another embodiment of the present invention is to produce a grain-oriented electrical steel sheet that can form grooves with a relatively low energy density, excellent iron loss improvement characteristics after laser irradiation, and can form a linear groove by scanning a laser at high speed To provide a way.
  • the groove in the grain-oriented electrical steel sheet having grooves formed on a surface thereof, the groove is formed in a state where a non-metal oxide layer is coated on the surface of the electrical steel sheet.
  • the groove may have a narrow width and a deep depth such that a ratio of the width Wb and the depth Db of the groove is 3.4: 1 to 1.5: 1.
  • the groove includes a groove having a width Wb and a depth Db of 3.2: 1 to 2: 1 and having a narrow width and a deep depth.
  • the inflection point Xb of the tangents interconnected by the vertical tangent rolls may be formed below the half point (1/2 Da) of the groove depth.
  • the groove has a radius of curvature at the point where the groove depth is maximum
  • (RBb) may be 0.2JM to 100 ⁇ m.
  • the nonmetal oxide layer may be formed by combining any one or any one of Mg 2 Si3 ⁇ 4, MgAl 2 O 4 , MnO, Mn, and Mn 2 Si0 4 .
  • the nonmetal oxide layer may be formed on the surface of the electrical steel sheet 1 ⁇ 20 / ⁇ thickness. As for the thickness of this nonmetal oxide layer, 1-5 are preferable.
  • the radius of curvature () at the groove surface from the point at which the groove depth is maximum to a quarter of the depth (D) of the groove can be 4 // m to 130.
  • the depth Db of the groove may be 3% to 8% of the thickness of the electrical steel sheet.
  • the upper width Wb of the groove may be 10 ffli to 50.
  • the groove is formed linearly and the linear groove may be 82 ° to 98 ° (not including 90 ° ) with respect to the rolling direction of the electrical steel sheet.
  • the method for manufacturing a grain-oriented electrical steel sheet according to another embodiment of the present invention includes applying an annealing separator after decarbonization of the cold rolled electrical steel sheet and forming secondary recrystallization by silver annealing to form a surface of the electrical steel sheet. Forming a nonmetal oxide layer on the substrate; And 9> forming grooves on the surface of the electrical steel sheet on which the non-metal oxide layer is formed, o> ratio of width (Wb) and depth (Db) of the grooves is narrow and has a depth of 3.4: 1 to 1.5: 1. Forming a groove to be deeply formed.
  • the groove forming step includes forming a groove using a continuous wave laser having a Gaussian energy distribution, a TEM 00 mode , and a beam quality factor of M 2 of 1.0 to 1.1. It may be.
  • the continuous wave laser may have a wavelength in the range of 1.06 1.08, an output of 0.5-5 kW, and an energy density of 0.5 2.0 J / m '.
  • the continuous wave laser may be either an Nd: YAG laser or a fiber laser beam. have.
  • the laser may be one having an energy density in the range of Equation 1 below.
  • a radius of curvature Bb at the point where the depth of the groove bottom is maximum, and a quarter point of the groove depth Db from the point at which the groove depth is maximum Forming the groove such that the inflection point (Xb) of the tangential portion interconnecting the vertical tangents of the radius of curvature (RSb) at the groove surface up to is formed below the half point (1/2 Da) of the groove depth.
  • Xb inflection point
  • RSb radius of curvature
  • the groove roll may be formed so that the radius of curvature RBb at the point where the depth of the groove is maximized is about 100 // 1I1.
  • the non-metal oxide layer may be one of Mg 2 Si0 4 , MgAl 2 O 4 , MnO, Mn, or Mn 2 Si0 4, in which one or any one or more of them is formed in combination.
  • the nonmetal oxide layer may be formed to a thickness of 1 2 ⁇ .
  • the thickness of such a non-metal oxide insect l-ffli is preferable.
  • the insulating coating layer may be further formed on the nonmetal oxide layer.
  • Recrystallization of the base steel sheet may be further formed by heat treating the electrical steel sheet on which the groove is formed.
  • the method of forming the recrystallization may be any one of a heat treatment or an inert pixel anneal that naturally forms a 3 ⁇ 4 worm.
  • the depth Db of the groove formed in the forming of the groove may be 3% to 8% of the thickness of the electrical steel sheet.
  • the upper width (Wb) of the groove formed in the step of forming the groove may be l im to 50.
  • the angle formed between the linear groove formed in the forming of the groove and the rolling direction of the electrical steel sheet may be 82 ° to 98 ° (not including 90 ° ).
  • the laser beam of (10) to (30) ⁇ 1 (1 in the width direction of the steel sheet and (5) / an to (20) in the rolling direction of the steel sheet is irradiated to the steel sheet to obtain the primary
  • the laser grooves (25) to (50) in the rolling direction of the steel sheet may be further formed to irradiate the primary grooves to further form the secondary grooves.
  • a groove having a relatively narrow width and a deep depth can be formed on a surface of a steel sheet which proceeds at a high speed.
  • the magnetization of the microstructure by laser irradiation is performed at a relatively low energy density by a nonmetal oxide layer formed on the surface of the steel sheet. can do.
  • the manufacturing method of the grain-oriented electrical steel sheet according to the embodiment of the present invention it is possible to form a narrow groove and a deep groove by the laser irradiation, and to secure the improvement characteristics of iron loss of 33 ⁇ 4 or more even after laser irradiation have.
  • FIG. 1 is a photograph showing a cross section of a groove formed on a grain-oriented electrical steel sheet according to one embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a cross section of a groove formed in a grain-oriented electrical steel sheet according to one embodiment of the present invention.
  • 5> is a view showing a cross-section of the groove formed on the grain-oriented electrical steel sheet according to an embodiment of the present invention
  • the steel sheet when a groove is formed on the surface of the steel sheet to a depth within 33 ⁇ 4-8% of the thickness of the steel sheet by using a laser, the steel sheet having an insulating coating on the nonmetal oxide layer or the nonmetal oxide layer having high laser absorption rate It is a permanent magnetization technique that can form grooves with a relatively low energy density by irradiating a laser on the surface, and improves iron loss after laser irradiation, and can form grooves by scanning a laser at high speed.
  • a molten alloy layer may not be formed on the side or the bottom of the groove, and some molten alloy worm may remain on the surface of the steel sheet on the left and right sides of the groove.
  • a nonmetal oxide layer should be formed on the surface of the steel sheet. This non-metal oxide layer is formed on the surface of the steel sheet after the secondary recrystallization by applying an annealing separator in the manufacturing process of the grain-oriented electrical steel sheet, followed by high temperature annealing.
  • the nonmetal oxides formed on the surface of the steel sheet after the annealing are Mg 2 Si0 4 ,
  • MgA l, 0 4> MnO, Mn0 2 or Mn 2 S i 04 may be formed in combination.
  • the laser absorption rate is increased by 30% or more than the steel sheet on which the non-metal oxide layer is not formed upon laser irradiation, so that grooves can be formed even at a relatively low energy density. It is possible to form linear grooves.
  • the steel sheet having the non-metal oxide layer is more efficient than the steel sheet without the non-metal oxide layer, so that the laser power required for groove formation is reduced by 20% or more, thereby improving iron loss.
  • the non-metal oxide worm when the non-metal oxide worm is formed on the surface of the steel sheet, such a non-metal oxide layer has a physicochemically strong bond with the surface of the steel sheet, so that the non-metal oxide layer is not easily destroyed even by thermal lamination by laser irradiation.
  • the nonmetal oxide layer having a high laser absorption rate is preferably formed on the surface of the steel sheet in a thickness of 1 to 20 GPa. If the thickness of the non-metal oxide layer is 1 or less, the effect of increasing the laser absorption is low, and when the laser is irradiated, the non-metal oxide layer may be destroyed by thermal shock. If it is 20 or more, it is difficult to control the process conditions for forming the non-metal oxide layer. There is a disadvantage that the laser power for forming is high. More preferably, the thickness of the nonmetal oxide layer formed on the surface of the steel sheet is.
  • the laser characteristics irradiated on the surface of the steel plate on which the nonmetal oxide layer is formed should have a Gaussian energy distribution of the final laser beam energy distribution. If the energy distribution has a Gaussian energy distribution, it is relatively independent of the laser oscillation method or the shape of the final pulse, but continuous wave lasers or extended pulse (< t >) are preferred.
  • a laser having a Gaussian energy distribution is preferably in the TEM 00 mode with a maximum intensity on the optical axis of the single-mode jeungsim.
  • the beam quality factor M 2 representing the laser beam mode is preferably 1.0 to 1.1.
  • a laser having a Gaussian energy distribution preferably uses a laser beam having a M 2 of 1.0 to 1.1 in a TEM 00 mode.
  • Lasers used for micronization are preferably lasers in the wavelength range 1.06-1.08. Therefore, any laser can be used as long as it is a laser in this wavelength range, and it is more preferable to use Nd: YAG laser or fiber laser.
  • the laser power used is 0.5-5 kW and the laser energy density is
  • the final shape of the laser beam irradiated to the steel sheet is preferably oval, the width of the other circular beam is preferably 0.005 ⁇ 0.1 ⁇ in the rolling direction, the length of the beam in the steel plate width direction is preferably 0.01-0.2mm.
  • Equation 1 The reason why the energy density of the laser is limited to Equation 1 is that, in the case of less than 0.010 W "L m / s, the iron loss characteristic is deteriorated due to the increase of the thermal effect on the groove when the groove is formed by the laser. This is because, if it is more than 0.080 ⁇ ⁇ 3, the gtub formed on the surface may not have a depth enough to improve the iron loss after heat treatment.
  • Figure 1 is a cross-sectional view of the groove formed on the grain-oriented electrical steel sheet according to an embodiment of the present invention
  • Figure 2 is a schematic view showing a cross-section of the portion formed in the grain-oriented electrical steel sheet.
  • ( ⁇ ) is a cross section of a steel sheet irradiated with laser under the following conditions in a state where only mineral oil is applied to an electrical steel sheet having a thickness of 0.23 ⁇ , from the manufacturing process of the grain-oriented electrical steel sheet to the cold rolling process.
  • ( ⁇ ) is manufactured from a mild steel sheet under the same conditions as ( ⁇ ), followed by applying an annealing separator based on MgO and performing secondary recrystallization annealing, followed by colloidal silica.
  • it is a cross-sectional photograph of the steel sheet irradiated with a laser on the electrical steel sheet further subjected to the process of applying the insulating coating liquid containing a metal phosphate under the following conditions.
  • a continuous wave fiber laser having a wavelength of 1.07 was used, wherein a range of fiber lasers irradiated onto the steel sheet was TEMoo mode and M 2 value was 1.07.
  • the size of the elliptical beam was 15 in the rolling direction and 40 ⁇ in the width direction of the steel plate.
  • the laser output power was 0.9 k
  • the laser energy density was 1,13 J / tnnf
  • the laser irradiation interval was 2.5 mm.
  • the electrical steel sheet used in Figure 1 is weight 3 ⁇ 4 0: 0.0050%, Si: 3.1%, C: 0.05%, A1:
  • the grooves were formed on the surface of the steel sheet under the same laser irradiation conditions, but the grooves formed on the steel sheet (A) after cold rolling had a width of 45an and a depth of 12.9, whereas the steel sheet on which the nonmetal oxide oxide of Mg 2 SiO + was formed ( Grooves formed in B) have a width of 30 The depth was 18.2 ⁇ .
  • the width of the groove here means the width Wa of the groove inlet formed in the steel sheet, ie, the maximum width of the groove on the surface of the steel sheet, as seen in FIG.
  • the grooves formed on the cold rolled steel sheet (/) are larger than the steel sheet (B) on which the nonmetal oxide oxide is formed, and conversely, the depth of the grooves formed on the steel sheet (A) after cold rolling was not deeper than the steel sheet (B) on which the non-metal oxide layer was formed, and this result shows that in the case of the steel sheet (B) on which the non-metal oxide layer is formed, the non-metal oxide layer formed on the surface of the steel sheet absorbs the energy of the laser better (for the cold rolled steel sheet).
  • the laser energy absorption rate is about 20%, and the laser energy absorption rate is about 40% for the steel plate on which the nonmetallic oxide layer is formed.)
  • the width and width are narrower and narrower by laser irradiation. This is because deep grooves are formed.
  • the thickness of the electrical steel sheet was further tested under the same conditions for 0.3 ⁇ , 0.27 ⁇ and 0.23 ⁇ , and as a result, the ratio of the width (Wa) and the depth (Da) of the groove formed in the steel sheet (A) after cold rolling was 5 1 yieoteu little more depth deepened by changing the laser irradiation conditions mye jideo even up to 3.5: was "confirmed to be 1 degree.
  • the ratio of the width (Wb) and the depth (Db) of the groove is a groove formed in the steel sheet to 3.4: 1 to 1.5: 1 degree Is relatively narrow in width and deeper in depth. Therefore, the ratio of the width Wb and the depth Db of the groove of the steel sheet B on which the nonmetal oxide layer is formed is preferably 3.4: 1 to 1.5: 1, and more preferably 3.2: 1 to 2: 1.
  • grooves When grooves are formed on the steel plate on which the non-metal oxide layer is formed, grooves can be formed with a relatively low energy density, and the width and groove depth ratio of the grooves are 3.4: 1 to 1.5: 1 so that iron loss can be obtained even after laser irradiation.
  • the baseline characteristics are high, and the grooves can be formed on the surface of the electrical steel sheet by scanning the laser at high speed.
  • the radius of the back is called the radius (B ⁇ 1 10 ,,,) at the point where the groove bottom is maximized and the groove surface from the point where the groove depth is maximum to the quarter point of the groove depth (D)
  • the radius of curvature is referred to as the RS surface at
  • the bottom radius of curvature of the groove formed in (A) is called RBa
  • the radius of curvature of the surface portion is called RSa
  • the grooves formed on the steel sheet (B) on which the nonmetal oxide layer is formed are also named RBb and RSb.
  • the groove formed is lower than the inflection point () below 1/2 of the groove depth (1/2 Da). It is desirable to control the process conditions so that they form.
  • Figure 3 is a view showing a cross section of the groove formed on the grain-oriented electrical steel sheet according to an embodiment of the present invention.
  • a nonmetal oxide layer 20 such as Mg 2 Si0 4 is formed on the surface of the steel sheet B, and is formed by magnetic domain refinement treatment. Grooves are formed on the surface of the steel sheet.
  • a non-metal oxide layer 20 such as Mg 2 Si0 4 is formed on the surface of the steel sheet B, and is formed by magnetic domain refinement treatment. Grooves are formed on the surface of the steel sheet.
  • An insulating coating layer may be selectively formed on the top.
  • the relatively narrow and deep grooves formed in the steel sheet may have a radius of curvature (RBb) of from 0. m to 100 / ⁇ at the point where the depth of the groove is maximized. More specifically, it may be from 0.9 3 ⁇ 4zm.
  • the depth Db of the groove means the distance from the portion where the groove on the surface of the steel sheet is not formed to the point where the depth of the groove becomes maximum.
  • the melt of the steel sheet remains inside the groove. It is difficult to secure electrical insulation properties after insulation coating, and if it exceeds 130, the iron loss improvement rate may decrease. However, the melt formed by laser irradiation may solidify and remain on the outer surface of the upper portion of the groove, as indicated by reference numeral 40 of FIG. 3.
  • the depth Db of the groove may be 3% to 8% of the thickness of the electric steel pipe. More specifically, it may be 43 ⁇ 4 to 8%. If it is less than 3%, grooves of appropriate depth are not formed to improve iron loss. If it exceeds 8%, the heat affected zone may increase, adversely affecting the growth of the Goss Texture.
  • the upper width (Wb) of the groove may be 1 to 50. If it is less than 10, the proper width for iron loss is not maintained, and if it is more than 50, the heat-affected zone may increase and the magnetism may be degraded.
  • the lower portion of the groove may be formed of the recrystallization 30 of the steel sheet due to the heat effect.
  • the electrical steel sheet exhibits iron loss improving characteristics due to the narrow domain.
  • This recrystallization 30 may be formed discontinuously at the bottom of the groove, or may be formed continuously.
  • the method of forming the recrystallization 30 in the lower portion of the groove may be formed by forming grooves by laser irradiation and then heat treating the steel sheet.
  • heat treatment methods include a heat treatment or insulation relaxation annealing after insulation coating.
  • the groove may be formed at 82 ° to 98 ° with respect to the rolling direction of the electrical steel sheet.
  • the magnetic field can be improved by weakening the semi-magnetic field.
  • the manufacturing process of grain-oriented electrical steel sheet is hot-rolled and hot-rolled annealing slab (slab) of Si 3 weight 3 ⁇ 4, cold rolling, decarbonization (primary recrystallization annealing), hot annealing (secondary recrystallization annealing) , Insulation coating is done in order.
  • Magnetic micronization by laser irradiation can be carried out after hot rolling or after secondary recrystallization annealing, but the method of manufacturing a grain-oriented electrical steel sheet according to one embodiment of the present invention is the surface of the steel sheet after decarbonization (primary recrystallization annealing). After application of the annealing separator to the silver annealing (secondary recrystallization annealing) to form a non-metal oxide charge on the surface of the steel sheet, the surface of the steel sheet can be irradiated with a laser to perform micronization.
  • the method of forming a non-metal oxide layer on the surface of the steel sheet is to prepare a cold rolled steel sheet by the manufacturing process of the electrical steel sheet, then subjected to decarbonization annealing, MgO as a main component and applying an annealing separator composed of other additives on the steel sheet , Mg 2 Si0 4 by high temperature annealing
  • a method of forming a non-metal oxide worm in which non-metal oxides such as (Forsterite), MgAl 2 O 4 (spinel), MnO, Mn0 2 , and Mi Si0 4 alone or in combination is present.
  • the laser may be irradiated immediately to irradiate the particles, or the insulating coating solution containing colloidal silica and metal phosphate may be applied and heat-treated on the non-metal oxide layer to insulate the steel sheet surface. After the additional film is formed, the laser may be irradiated to perform micronization.
  • the filler increases the absorption rate, thereby forming grooves with a relatively low energy density.
  • the irradiation conditions of the laser may satisfy Equation (1).
  • the laser beam used at this time is irrelevant to the laser oscillation method if the energy distribution has a Gaussian energy distribution, but a continuous wave laser or an extended plus laser is preferable.
  • a laser having a Gaussian energy distribution is preferably TEM 00 mode having the maximum intensity at the center of the optical axis of the Sunggle mode.
  • the beam quality factor M 2 representing the mode of the laser beam is preferably 1.0 to 1.1.
  • Lasers used for micronization are preferably lasers with an exaggeration in the range of 1.06 to 1.08. So any laser in this wavelength range can be any Nd: YAG It is more preferable to use a laser or a fiber laser.
  • the laser power used is 0.5 to 5 kW, and the energy density of the laser is
  • the final shape of the laser beam irradiated to the steel sheet is preferably elliptical, 0.005 0.1mm in the rolling direction width temperature of the other circular beam is preferred, the length of the beam in the steel plate width direction is preferably 0.03-0.2 ⁇ .
  • a groove having a depth of 3% to 83 ⁇ 4 of the thickness of the electrical steel sheet may be formed by irradiating a laser to satisfy the above condition.
  • the radius of curvature (RBb) at the point where the depth of the groove is maximized by irradiating a laser beam having a different width and length on the groove is again 0.2.
  • the groove can be formed such that the radius of curvature (RSb) is 4 kPa to 130 1 at the groove surface from kPa to 10 an and the groove depth from the point at which the groove depth is maximum to one quarter of the depth (D) of the groove. .
  • a laser beam having a width of 10 to 30/411 in the width direction of the steel sheet and 5 // m to 2 TM in the rolling direction of the steel sheet is irradiated to the steel pipe to form a primary groove, and then the 1
  • the secondary groove may be formed by irradiating a laser beam having a width of 35 mW to 80 / m in the width direction of the steel sheet and 23 ⁇ 4 / m to 50 in the rolling direction of the steel sheet on the secondary groove.
  • the radius of curvature (RBb) at the point where the groove depth is maximum is between 0.3 ⁇ 43 ⁇ 4m and 100, and at the groove surface from the point where the groove depth is maximum to one quarter of the depth (D) of the groove.
  • the groove may be formed such that the radius of curvature RSb is im or less.
  • the method of forming the grooves is merely exemplary, and the radius of curvature RBb at the point where the groove depth is maximum is 0. ffli to 100, and the groove depth is maximum.
  • the object of the present invention can be achieved when the radius of curvature RSb is from 130 to 130. It is not limited.
  • the method of forming the groove is preferably a method by laser irradiation, but also includes forming a groove by mechanical polishing or forming a groove by chemical etching.
  • the slab was heated at 1100 ° C and hot rolled to prepare a hot rolled steel sheet. Thereafter, the hot rolled steel sheet was cold rolled to prepare a cold rolled steel sheet having a thickness of 0.3 mm.
  • the output of the fiber laser was 900W, and the scan speed was adjusted to satisfy the V / P values as shown in Table 1 below.
  • the radius of curvature (RSb) at the groove surface was to have the value shown in Table 1.
  • the linear groove was formed to have an angle of 85 ° with the rolling direction of the electrical steel sheet.
  • the iron loss improvement rate was calculated by measuring the iron loss () before forming the groove by laser irradiation and the iron loss () after irradiation with the laser (W!-).
  • the invention examples satisfying the laser irradiation condition and the groove forming condition of the present invention showed an improvement in iron loss of .3% or more, but the laser irradiation condition and the groove forming condition of the present invention were not satisfied. In all cases, iron loss improvement was found to be less than 3%.

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Abstract

La présente invention selon un mode de réalisation porte sur une tôle d'acier électrique à grains orientés pourvue de rainures sur sa surface, le rayon de courbure au point de plus grande profondeur de rainure (RBb) étant de 0,2 à 100 µm et le rayon de courbure au niveau de la surface de rainure du point de plus grande profondeur de rainure jusqu'au point à ¼ de la profondeur de la rainure (D) (RSb) étant de 4 à 130 µm.
PCT/KR2015/014036 2014-12-24 2015-12-21 Tôle d'acier électrique à grains orientés et procédé permettant la production de cette dernière WO2016105055A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PL15873582T PL3239325T3 (pl) 2014-12-24 2015-12-21 Blacha cienka ze stali elektrotechnicznej o budowie kierunkowej i sposób jej wytwarzania
US15/539,960 US10815545B2 (en) 2014-12-24 2015-12-21 Grain-oriented electrical steel plate and manufacturing method thereof
JP2017533470A JP6496412B2 (ja) 2014-12-24 2015-12-21 方向性電磁鋼板およびその製造方法
EP15873582.9A EP3239325B1 (fr) 2014-12-24 2015-12-21 Tôle d'acier électrique à grains orientés et procédé permettant la production de cette dernière
CN201580070962.7A CN107109512B (zh) 2014-12-24 2015-12-21 取向电工钢板及其制造方法

Applications Claiming Priority (4)

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KR10-2014-0189060 2014-12-24
KR20140189060 2014-12-24
KR1020150177394A KR101719231B1 (ko) 2014-12-24 2015-12-11 방향성 전기강판 및 그 제조방법
KR10-2015-0177394 2015-12-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210060694A1 (en) * 2017-12-26 2021-03-04 Posco Grain-oriented electrical steel sheet and magnetic domain refining method therefor
EP3901972A4 (fr) * 2018-12-19 2022-03-09 Posco Tôle électrique à grains orientés et procédé pour sa fabrication
US11393612B2 (en) 2018-02-26 2022-07-19 Nippon Steel Corporation Grain-oriented electrical steel sheet

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JPH07220913A (ja) * 1994-02-04 1995-08-18 Nippon Steel Corp 磁気特性の優れた電磁鋼板
KR20080010454A (ko) * 2005-05-09 2008-01-30 신닛뽄세이테쯔 카부시키카이샤 저철손 방향성 전기강판 및 그 제조 방법
KR20130020933A (ko) * 2010-08-06 2013-03-04 제이에프이 스틸 가부시키가이샤 방향성 전기 강판
KR20130128214A (ko) * 2012-05-16 2013-11-26 주식회사 포스코 방향성 전기강판 및 그 제조방법
KR20140133974A (ko) * 2013-05-09 2014-11-21 주식회사 포스코 방향성 전기강판 및 그 자구미세화 방법

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Publication number Priority date Publication date Assignee Title
JPH07220913A (ja) * 1994-02-04 1995-08-18 Nippon Steel Corp 磁気特性の優れた電磁鋼板
KR20080010454A (ko) * 2005-05-09 2008-01-30 신닛뽄세이테쯔 카부시키카이샤 저철손 방향성 전기강판 및 그 제조 방법
KR20130020933A (ko) * 2010-08-06 2013-03-04 제이에프이 스틸 가부시키가이샤 방향성 전기 강판
KR20130128214A (ko) * 2012-05-16 2013-11-26 주식회사 포스코 방향성 전기강판 및 그 제조방법
KR20140133974A (ko) * 2013-05-09 2014-11-21 주식회사 포스코 방향성 전기강판 및 그 자구미세화 방법

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210060694A1 (en) * 2017-12-26 2021-03-04 Posco Grain-oriented electrical steel sheet and magnetic domain refining method therefor
US11772189B2 (en) * 2017-12-26 2023-10-03 Posco Co., Ltd Grain-oriented electrical steel sheet and magnetic domain refining method therefor
US11393612B2 (en) 2018-02-26 2022-07-19 Nippon Steel Corporation Grain-oriented electrical steel sheet
EP3901972A4 (fr) * 2018-12-19 2022-03-09 Posco Tôle électrique à grains orientés et procédé pour sa fabrication
US12084736B2 (en) 2018-12-19 2024-09-10 Posco Co., Ltd Grain-oriented electrical steel sheet and manufacturing method therefor

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