WO2022250159A1 - 方向性電磁鋼板の製造方法 - Google Patents

方向性電磁鋼板の製造方法 Download PDF

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WO2022250159A1
WO2022250159A1 PCT/JP2022/021832 JP2022021832W WO2022250159A1 WO 2022250159 A1 WO2022250159 A1 WO 2022250159A1 JP 2022021832 W JP2022021832 W JP 2022021832W WO 2022250159 A1 WO2022250159 A1 WO 2022250159A1
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less
annealing
rolling
sheet
cold
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French (fr)
Japanese (ja)
Inventor
猛 今村
之啓 新垣
広 山口
雅紀 竹中
広朗 戸田
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JFE Steel Corp
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JFE Steel Corp
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys 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
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition

Definitions

  • the present disclosure relates to a method for manufacturing a grain-oriented electrical steel sheet.
  • Electrical steel sheet is a material widely used as iron cores for transformers and motors. Electrical steel sheets are broadly classified into grain-oriented electrical steel sheets and non-oriented electrical steel sheets.
  • the ⁇ 001> orientation which is the axis of easy magnetization of iron, has a texture that is highly aligned in the rolling direction of the steel sheet. It is characteristic that Such a texture is formed by causing secondary recrystallization in the final annealing.
  • the secondary recrystallization refers to a phenomenon in which crystal grains of ⁇ 110 ⁇ 001> orientation, so-called Goss orientation, preferentially grow into large grains by utilizing grain boundary energy.
  • inhibitors As a representative technique for causing the above secondary recrystallization, there is a technique that utilizes precipitates called inhibitors. For example, a method using AlN and MnS described in Patent Document 1, a method using MnS and MnSe described in Patent Document 2, and the like are known and have been industrially put into practical use. Methods using these inhibitors are useful for stably developing secondary recrystallized grains. In these methods, in order to finely disperse the inhibitor in the steel, it is necessary to heat the slab at a high temperature of 1300° C. or higher to dissolve the inhibitor component once.
  • Patent Document 3 and the like disclose a technique for developing Goss-oriented crystal grains by secondary recrystallization in a material that does not contain an inhibitor component. By eliminating impurities such as inhibitor components as much as possible, the dependence of the grain boundary energy on the grain boundary during primary recrystallization on the grain boundary misorientation angle is made apparent, and the Goss orientation can be obtained without using an inhibitor. It is a technique for secondary recrystallization of grains with grains, and its effect is called texture inhibition effect. Since this method does not require fine dispersion of the inhibitor in the steel, it does not require high-temperature slab heating, which was essential, and thus has advantages over the method using the inhibitor in terms of production.
  • the inventors of the present invention have found that when producing a grain-oriented electrical steel sheet using a composition system that utilizes an inhibitor, a striped pattern with a pitch of several millimeters may occur in the film appearance of the product sheet, and the location where the striped pattern occurs We found that the coating adhesion deteriorated in
  • the present invention has been made in view of the above problems, and provides a grain-oriented electrical steel sheet that has a defect-free uniform coating with excellent adhesion over the entire width and length of the coil and also has excellent magnetic properties.
  • This paper proposes a manufacturing method.
  • the present inventors have found that the total reduction ratio of finish rolling of hot rolling and the total reduction ratio of the first cold rolling are increased, and Si compounds are added to the surface of the cold rolled sheet before decarburization annealing.
  • the inventors have found that the adhesion of the film improves by adhering it.
  • the present invention has been made based on the above findings. That is, the gist and configuration of the present invention are as follows.
  • a steel slab having a chemical composition consisting of Fe and unavoidable impurities is slab-heated to 1300 ° C.
  • the hot-rolled sheet is cold-rolled one or more times with or without hot-rolled sheet annealing, optionally with intermediate annealing, to obtain a cold-rolled sheet; Then, the cold-rolled sheet is subjected to decarburization annealing to obtain a decarburization-annealed sheet,
  • an annealing separator is applied to the surface of the decarburized annealed sheet, and then finish annealing is performed to obtain a grain-oriented electrical steel sheet,
  • the total rolling reduction of the finish rolling in the hot rolling is 83% or more, and the total rolling reduction of the first cold rolling is 50% or more
  • the steel slab is subjected to one pass or more of rough rolling at 1100°C or higher and 1300°C or lower, followed by two or more passes of finish rolling at 800°C or higher and 1100°C or lower. and the winding temperature is 400° C. or higher and 750° C. or lower
  • the hot-rolled sheet annealing the hot-rolled sheet is held at 800° C. or higher and 1250° C. or lower for 5 seconds or longer, and then cooled from 800° C. to 350° C. at an average cooling rate of 5° C./s or higher and 100° C./s or lower.
  • the total rolling reduction of the cold rolling is 50% or more and 92% or less, and the total rolling reduction of the cold rolling each time is 50% or more and 92% or less
  • the intermediate annealing after holding in a temperature range of 800° C. or higher and 1250° C. or lower for 5 seconds or longer, cooling is performed at an average cooling rate of 5° C./s or higher and 100° C./s or lower from 800° C. to 350° C.
  • the cold-rolled sheet is held at 750° C. or more and 950° C.
  • the annealing separator containing MgO is applied to the surface of the decarburized annealed sheet in an amount of 2.5 g/m 2 or more per side,
  • the decarburization-annealed sheet is held at 1050° C. or higher and 1300° C. or lower for 3 hours or more under conditions in which the atmosphere in at least a part of the temperature range of 800° C. or higher contains H 2 .
  • the component composition is further mass % or mass ppm, Ni: 0% or more and 1.50% or less, Cr: 0% or more and 0.50% or less, Cu: 0% or more and 0.50% or less, P: 0% or more and 0.50% or less, Sb: 0% or more and 0.50% or less, Sn: 0% or more and 0.50% or less, Bi: 0% or more and 0.50% or less, Mo: 0% or more and 0.50% or less, B: 0 ppm or more and 25 ppm or less, Nb: 0% or more and 0.020% or less, V: 0% or more and 0.010% or less and Zr: 0% or more and 0.10% or less, containing one or more selected from the group consisting of 0% or more and 0.10% or less, according to any one of the above [1] to [3] A method for producing a grain-oriented electrical steel sheet.
  • the component composition further includes, in mass %, Co: 0% or more and 0.050% or less and Pb: 0% or more and 0.0100% or less, containing one or two selected from the group consisting of 0% or more and 0.0100% or less, according to any one of [1] to [4] A method for producing a grain-oriented electrical steel sheet.
  • the component composition further includes, in mass %, As: 0% or more and 0.0200% or less, Zn: 0% or more and 0.020% or less, W: 0% or more and 0.0100% or less Ge: 0% or more and 0.0050% or less Ga: 0% or more and 0.0050% or less ] to [5], the method for producing a grain-oriented electrical steel sheet.
  • the present invention it is possible to obtain a grain-oriented electrical steel sheet that has a defect-free uniform coating with excellent adhesion over the entire width and length of the coil, and also has excellent magnetic properties.
  • FIG. 4 is a diagram showing the relationship between the adhesion amount of Si compound before decarburization annealing and film adhesion. It is the figure which expanded and showed the part enclosed with the dotted line of FIG.
  • the present invention specifies the total rolling reduction of hot rolling and cold rolling, and adheres a compound containing Si to the surface of the steel sheet before decarburization annealing. We succeeded in improving peeling characteristics. The experiments that have led to the success of the present invention are described below.
  • various sheet thicknesses of 0.60 to 1.8 mm were produced by the first cold rolling.
  • the total rolling reduction of the first cold rolling was from 10.0% to 81.8%.
  • intermediate annealing was performed at 1020° C. for 100 seconds, followed by second cold rolling to finish a cold-rolled sheet with a thickness of 0.23 mm.
  • the cold-rolled steel sheet was subjected to electrolytic treatment in a 5% sodium orthosilicate aqueous solution, also serving as electrolytic degreasing, so that 2.0 mg/m 2 of Si compound was deposited on the surface of the steel sheet.
  • decarburization annealing was performed at 850° C. ⁇ 120 seconds, 50% H 2 +50% N 2 , dew point 60° C. to obtain a decarburization-annealed sheet.
  • finish annealing was performed at 1200 ° C. for 5 hours in an H 2 atmosphere to obtain a directional property.
  • An electromagnetic steel sheet was obtained. A sample was cut out from the obtained grain-oriented electrical steel sheet, and the film adhesion was evaluated. Coating adhesion was evaluated by winding samples around cylinders having various diameters and determining the minimum diameter at which the coating did not peel off.
  • FIG. 1 shows the relationship between the total rolling reduction of the hot finish rolling, the total rolling reduction of the first cold rolling, and the film adhesion. As is clear from FIG. 1, when the total rolling reduction in the finish rolling of the hot rolling is 83% or more and the total rolling reduction in the first cold rolling is 50% or more, excellent film adhesion is obtained. I found that it can be done.
  • the sheet was made to have a sheet thickness of 0.72 mm by the first cold rolling. The total rolling reduction of the first cold rolling was 71.2%.
  • intermediate annealing was performed at 925° C. for 100 seconds, followed by second cold rolling to finish a cold-rolled sheet with a thickness of 0.23 mm.
  • an electrolytic treatment was performed in a 3% sodium orthosilicate aqueous solution, also serving as electrolytic degreasing, to attach a Si compound to the surface of the cold-rolled sheet.
  • the adhesion amount of the Si compound was set under various conditions including no adhesion of 0 mg/m 2 .
  • the cold-rolled sheet to which the Si compound was attached was subjected to decarburization annealing at 850° C. ⁇ 120 seconds, 50% H 2 +50% N 2 , dew point 64° C.
  • a decarburization-annealed sheet After applying an annealing separator containing 85% by mass or more of MgO in terms of solid content to the surface of the decarburized annealed sheet, it was subjected to finish annealing at 1200 ° C. for 10 hours in an H 2 atmosphere, and the directionality An electromagnetic steel sheet was obtained. A sample was cut out from the obtained grain-oriented electrical steel sheet, and the film adhesion was evaluated. Coating adhesion was evaluated by winding samples around cylinders having various diameters and determining the minimum diameter at which the coating did not peel off. In addition, the amount of Si deposited on the cold-rolled sheet before decarburization annealing was measured using a fluorescent X-ray spectrometer.
  • FIG. 2 shows the relationship between the adhesion amount of the Si compound before decarburization annealing and the film adhesion.
  • FIG. 3 shows an enlarged portion surrounded by a dotted line in FIG. As is clear from FIGS.
  • a compound containing Si is attached to the surface of the cold-rolled sheet before decarburization annealing in an amount of 0.1 mg/m 2 or more and 7.0 mg/m 2 or less per side in terms of Si weight. , it was found that excellent film adhesion can be obtained.
  • the subscale structure affects not only the appearance of the coating, but also the formation of a shape called an anchor, in which the coating bites into the base iron. It is known that if this anchor shape is developed, the film adhesion is good, but if the anchor formation is poor, the film adhesion is deteriorated. In this experiment, it is thought that the subscale structure differs in a striped pattern after decarburization annealing. It is presumed that the film adhesion deteriorated at
  • the Si compound used in the present invention is substantially composed of Si, O, H or Si, O, that is, silica represented by SiO 2 or a compound in which H 2 O is bonded thereto. .
  • C 0.01% or more and 0.10% or less If the amount of C exceeds 0.10%, magnetic aging may occur after decarburization annealing. On the other hand, if the amount of C is less than 0.01%, secondary recrystallized grains become coarse, causing an increase in core loss and deterioration in bending workability. Therefore, C is limited to 0.01% or more and 0.10% or less. The amount of C is preferably 0.03% or more. Moreover, the amount of C is preferably 0.06% or less.
  • Si 2.0% or more and 4.0% or less Si is an element necessary for increasing the resistivity of steel and improving iron loss. %, the secondary recrystallization becomes unstable and the magnetic properties deteriorate, so the Si content is limited to 2.0% or more and 4.0% or less.
  • the amount of Si is preferably 3.0% or more.
  • the amount of Si is preferably 3.6% or less.
  • Mn 0.01% or more and 0.30% or less
  • Mn is an element necessary for using MnS or MnSe as an inhibitor. If it exceeds 0.30%, the secondary recrystallization becomes unstable and the magnetic properties deteriorate. Therefore, the Mn content is set to 0.01% or more and 0.30% or less.
  • the amount of Mn is preferably 0.03% or more.
  • the Mn content is preferably 0.20% or less, more preferably 0.15% or less.
  • Ti and Al form nitrides, impairing the inhibitory effects of MnS and MnSe and degrading the magnetic properties. Therefore, Ti: 0.010% or less, Al: 0.010% or less, and N: 0.0050% or less.
  • Ti, Al and N are each 0.0020% or less.
  • Ti and Al are each preferably 0.001% or more, and N is 0.0005% or more.
  • the total content of S and Se should be in the range of 0.005% or more and 0.10% or less. It is preferably 0.010% or more and 0.040% or less.
  • Ni 0% to 1.50%
  • Cr 0% to 0.50%
  • Cu 0% to 0.50%
  • P 0% to 0.50%
  • Sb 0% to 0.50%
  • Sn 0% to 0.50%
  • Bi 0% to 0.50%
  • Mo 0% to 0.50%
  • B 0 ppm 25 ppm or less
  • Nb 0% or more and 0.020% or less
  • V 0% or more and 0.010% or less
  • Zr 0% or more and 0.10% or less.
  • Ni 0.01% or more
  • Sb 0.005% or more
  • Sn 0.005% or more
  • Cu 0.01% or more
  • Cr 0.01%
  • P 0.005% or more
  • Mo 0.005% or more
  • Nb 0.001% or more
  • V 0.001% or more
  • B 0.0002% or more
  • Bi 0.005% or more
  • Zr It is preferable to add 0.001% or more.
  • one or two selected from the group consisting of Co: 0% or more and 0.050% or less and Pb: 0% or more and 0.0100% or less can be added. If the amounts of Co and Pb added are not more than the above upper limits, the magnetic properties are more favorable. From the viewpoint of further improving film adhesion, it is preferable to add Co: 0.002% or more and Pb: 0.0001% or more.
  • Magnetic properties are more favorable if each is equal to or less than the above upper limit.
  • Zn 0.001% or more
  • W 0.0010% or more
  • Ge 0.0001% or more
  • Ga 0.0001% or more It is preferable to add at
  • a steel slab is manufactured using molten steel having the chemical composition described above.
  • the method of manufacturing the steel slab is not particularly limited, and the steel slab may be manufactured by a normal ingot casting method and continuous casting method, or a steel slab with a thickness of 100 mm or less may be manufactured by a direct casting method. These steel slabs are subjected to hot rolling after slab heating in the usual manner. Hot rolling may be performed immediately after casting without heating.
  • the steel slab is slab-heated to 1300°C or higher before hot rolling.
  • the inhibitor component can be sufficiently solid-dissolved.
  • the slab heating temperature is based on the slab surface temperature.
  • the steel slab after heating is hot-rolled to form a hot-rolled sheet.
  • the total rolling reduction in finish rolling of hot rolling must be 83% or more.
  • a grain-oriented electrical steel sheet having a defect-free uniform coating with excellent adhesion and excellent magnetic properties by increasing the coating adhesion by setting the total rolling reduction of the finish rolling of hot rolling to 83% or more. can be obtained.
  • the total reduction in finish rolling of hot rolling is preferably 87% or more, more preferably 90% or more.
  • the upper limit of the total rolling reduction in finish rolling of hot rolling is not particularly limited, it is preferably 96% or less from the viewpoint of cost.
  • the number of hot rolling passes and the rolling reduction in each pass are not particularly limited.
  • the hot-rolled sheet From the viewpoint of controlling the structure of the hot-rolled sheet, it is preferably rough-rolled at 1100°C or higher, more preferably at 1300°C or lower for one or more passes. Subsequently, from the viewpoint of controlling the structure of the hot-rolled sheet, it is preferable to carry out two or more passes of finish rolling at 800° C. or higher and 1100° C. or lower. Further, it is preferable to set the winding temperature to 400° C. or higher and 750° C. or lower from the viewpoint of both control of carbide structure and prevention of defects such as cracks. The winding temperature is more preferably 500°C or higher and 700°C or lower. The temperature in hot rolling and the coiling temperature are based on the surface of the steel sheet immediately before coiling.
  • the hot-rolled sheet can optionally be subjected to hot-rolled sheet annealing.
  • the annealing conditions for hot-rolled sheet annealing are preferably 800° C. or higher and 1250° C. or lower and held for 5 seconds or longer.
  • Annealing conditions for hot-rolled sheet annealing are more preferably 900° C. or higher and 1150° C. or lower and held for 10 seconds or longer and 180 seconds or shorter.
  • the average cooling rate is 5 ° C./s or more and 100 ° C./s or less in the temperature range from 800 ° C.
  • the average cooling rate in the temperature range from 800°C to 350°C is more preferably 15°C/s or more and 45°C/s or less.
  • a method for removing scale is not particularly limited, and known methods such as a method using heated acid (pickling) and a method for mechanically removing scale may be used.
  • the steel is optionally subjected to one or more cold rolling steps with intermediate annealing to obtain a cold-rolled steel sheet having a final thickness.
  • the first cold rolling it is essential to set the total rolling reduction to 50% or more for the reasons described above.
  • a grain-oriented electrical steel sheet having a defect-free uniform coating with excellent adhesion and excellent magnetic properties by increasing the coating adhesion by setting the total rolling reduction of the first cold rolling to 50% or more. can be obtained.
  • the total rolling reduction of the first cold rolling is preferably 53% or more, more preferably 55% or more, still more preferably 60% or more.
  • the upper limit of the total rolling reduction in the first cold rolling is not particularly limited, it is preferably 92% or less from the viewpoint of reducing the rolling load.
  • a lubricant such as rolling oil in order to reduce the rolling load and improve the rolling shape.
  • intermediate annealing is optionally performed.
  • the annealing temperature of the intermediate annealing it is possible to prevent the recrystallized grains from becoming excessively fine, to allow the nuclei of the Goss orientation crystal grains to grow well in the primary recrystallized structure, and to further improve the magnetic properties. can.
  • the temperature of the intermediate annealing to 1250° C. or lower, the rapid growth and decomposition of the inhibitor can be prevented, and the magnetic properties can be further improved.
  • the average cooling rate from 800 ° C. to 350 ° C. is 5 ° C./s or more and 100 ° C./s or less, from the viewpoint of controlling the morphology of the second phase and precipitates. is preferred. More preferably, the average cooling rate from 800°C to 350°C is 15°C/s or more and 45°C/s or less.
  • the temperature in the intermediate annealing is based on the surface of the steel sheet.
  • a method for removing scale is not particularly limited, and known methods such as a method using heated acid (pickling) and mechanical scale removal may be used.
  • the cold-rolled sheet optionally subjected to intermediate annealing may be subjected to cold rolling one or more times.
  • cold rolling is performed multiple times, it is preferable from the viewpoint of structure control that the total rolling reduction of the multiple cold rollings is 50% or more and 92% or less.
  • the total rolling reduction is preferably 50% or more and preferably 92% or less in each cold rolling.
  • a compound containing Si (hereinafter also referred to as a Si compound) consists essentially of Si, O, H or Si, O. That is, silica represented by SiO 2 or a compound in which H 2 O is bonded thereto corresponds to the Si compound.
  • a compound containing Si is attached to the surface of the cold-rolled steel sheet before decarburization annealing in an amount of 0.2 to 6.1 mg/m 2 , more preferably 1 to 5 mg/m 2 per side in terms of Si weight.
  • Si compounds for example, orthosilicic acid (H 4 SiO 4 ), metasilicic acid (H 2 SiO 3 ), water-soluble ultrafine SiO 2 such as colloidal silica, and alkali silicate.
  • orthosilicic acid H 4 SiO 4
  • metasilicic acid H 2 SiO 3
  • water-soluble ultrafine SiO 2 such as colloidal silica
  • alkali silicate examples include electrolytic treatment of the steel sheet in an aqueous solution.
  • the cold-rolled sheet is subjected to decarburization annealing to obtain a decarburization-annealed sheet.
  • Conditions for decarburization annealing are not particularly limited, and conventional methods can be used.
  • the decarburization annealing is preferably carried out in a temperature range of 750° C. or higher and 950° C. or lower because the temperature range promotes decarburization.
  • the holding time in the above temperature range is preferably 10 seconds or more in order to sufficiently decarburize the C in the steel.
  • the atmosphere in the above temperature range for decarburization annealing preferably contains H2 , which affects oxidizability, and N2 , which is an inert gas, to facilitate control of oxidizability.
  • the decarburization annealing is preferably performed in a moist atmosphere with a dew point of 20° C. or higher and 80° C. or lower. More preferably, in the decarburization annealing, the temperature range is 800°C or higher and 900°C or lower, and the dew point is set to 40°C or higher and 70°C or lower. In addition, the temperature in decarburization annealing is based on the steel plate surface.
  • the decarburization annealing is divided into pre-annealing and post-annealing, and the pre-annealing has an atmosphere oxidizing P(H 2 O)/P(H 2 ) of 0.3 or more and 0.7 or less, and the post-annealing has an atmosphere oxidizing The annealing is performed in an atmosphere where P(H 2 O)/P(H 2 ) is 0.005 or more and 0.2 or less.
  • annealing separator After applying an annealing separator to both the front and back surfaces of the decarburized annealed sheet, finish annealing is performed to obtain a grain-oriented electrical steel sheet.
  • a known annealing separator can be used as the annealing separator.
  • "mainly composed of MgO” means that the content of MgO in the annealing separator is 60% or more in terms of solid content.
  • the content of MgO in the annealing separator is preferably 80% or more in terms of solid content.
  • the method of applying the annealing separator to the surface of the decarburized annealed sheet is not particularly limited, and any known method may be used.
  • the annealing separator may be applied in the form of a slurry to the surface of the decarburized annealed plate, or dry applied by electrostatic coating.
  • the slurry annealing separator in order to suppress the viscosity increase, the slurry annealing separator should be kept at a constant temperature of 5 ° C or higher and 30 ° C or lower to prevent fluctuations in liquid properties such as viscosity. It is preferable because it can be applied with a constant weight per unit area.
  • the decarburized annealed sheet is subjected to finish annealing.
  • finish annealing can be carried out by a conventional method.
  • the decarburization-annealed sheet is coiled into a steel sheet coil, and then subjected to finish annealing. Since finish annealing generally takes a long time, the steel sheet coil is preferably annealed in an up-end state (the central axis of the steel sheet coil is perpendicular to the ground). It is preferable to wind a band or the like around the steel sheet coil before the final annealing. This is because the outer winding of the up-end steel sheet coil can be prevented from unwinding during the finish annealing.
  • the temperature is preferably raised to 800° C. or higher in order to complete the secondary recrystallization, and in the case of forming a forsterite film, the temperature is preferably raised to 1050° C. or higher.
  • at least a part of the atmosphere within the temperature range of 800° C. or higher contains H 2 from the viewpoint of promotion of purification and promotion of film formation.
  • an insulating coating may be applied to the surface of the grain-oriented electrical steel sheet in order to ensure insulation.
  • the insulating coating is preferably a coating capable of applying tension to the grain-oriented electrical steel sheet to reduce iron loss.
  • the insulating coating liquid may be applied before flattening annealing, and baking may be performed by flattening annealing.
  • a tension coating application method using a binder, a physical vapor deposition method, or a chemical vapor deposition method may be used to vapor-deposit an inorganic material on the steel sheet surface layer for coating. Coating by these methods is preferable because the coating adhesion is excellent and the iron loss is significantly reduced.
  • the manufacturing conditions other than the conditions described above can be according to the usual method.
  • Example 1 (Example 1) % by mass, C: 0.051%, Si: 3.08%, Mn: 0.09%, Se: 0.020%, Ti: 0.002%, Al: 0.002%, N: 0.02% A steel slab having a chemical composition containing 0010% and the balance being Fe and unavoidable impurities is heated to a temperature of 1400 ° C. and subjected to 4 passes of rough rolling and 6 passes of finish rolling to form a hot rolled sheet. did. At that time, the rolling temperature in the final pass of rough rolling was set to 1200°C, and the rolling temperature in the final pass of finish rolling was set to 950°C. Furthermore, the total reduction in finish rolling was changed as shown in Table 1.
  • the total rolling reduction in the first cold rolling was changed as shown in Table 1, and then intermediate annealing was performed at 1000° C. for 200 seconds.
  • the cooling rate from 800°C to 350°C in this intermediate annealing was set to 30°C/s.
  • cold rolling was performed for the second time to finish a cold-rolled sheet with a sheet thickness of 0.23 mm.
  • the total rolling reduction of the second cold rolling was 67.1-87.2%.
  • finish annealing is performed at 1200 ° C. for 5 hours.
  • a flexible electrical steel sheet was obtained.
  • the atmosphere of the final annealing is N2 atmosphere during temperature rise up to 800°C, 25% N2 + 75% H2 atmosphere from 800°C to 1050°C, and H2 atmosphere from 1050°C to the end of holding at 1200°C .
  • An atmosphere was used, and an Ar atmosphere was used during cooling after holding.
  • Example 2 A steel slab having the chemical composition shown in Table 2 is heated to a temperature of 1425°C, subjected to four passes of rough rolling from 1270°C, and five passes of finish rolling from 1050°C. A hot-rolled sheet having a thickness of . At this time, the total reduction in finish rolling was 92.5%. Next, after removing scales on the surface of the hot-rolled sheet by pickling, the hot-rolled sheet was annealed at 985° C. for 30 seconds. After holding at 985°C, cooling was performed at an average cooling rate of 70°C/s from 800°C to 350°C. Then, the plate thickness was finished to 0.74 mm by the first cold rolling. The total rolling reduction of the first cold rolling was 75.3%.
  • an intermediate annealing was performed at 1100° C. for 40 seconds. After holding at 1100°C, cooling was performed at an average cooling rate of 20°C/s from 800°C to 350°C. After that, cold rolling was performed for the second time to finish a cold-rolled sheet with a sheet thickness of 0.23 mm. The total rolling reduction of the second cold rolling was 68.9%. Subsequently, an electrolytic treatment in a 2% sodium metasilicate aqueous solution was carried out for electrolytic degreasing, and a Si compound was deposited on the surface of the cold-rolled steel sheet at an amount of 1.2 mg/m 2 per side in terms of Si weight.
  • the sheet was subjected to finish annealing at 1200° C. for 5 hours.
  • the atmosphere of the final annealing is N 2 atmosphere during temperature rise up to 1000 ° C., H 2 atmosphere from 1100 ° C. to 1200 ° C. after the end of holding, until the temperature at the time of cooling reaches 1000 ° C., and Ar atmosphere in the subsequent cooling. did.
  • the coating adhesion and magnetic properties of the obtained samples were evaluated in the same manner as in Example 1. Table 2 also shows the evaluation results of film adhesion and magnetic properties.
  • Example 3 (Example 3) % by mass, C: 0.040%, Si: 3.00%, Mn: 0.07%, S: 0.007%, Se: 0.020%, Ti: 0.001%, Al: 0.001% 002%, N: 0.0015%, Mo: 0.022%, and Sb: 0.035%, the steel slab is slab-heated to a temperature of 1420 ° C., and rough rolling is performed from 1300 ° C. in four passes, A hot-rolled sheet with a thickness of 2.4 mm was finished by hot-rolling from 1100° C. with 5 passes of finish rolling. At this time, the total reduction in finish rolling was 93.1%.
  • the sheet was finished to a sheet thickness of 0.65 mm by the first cold rolling.
  • the total rolling reduction of the first cold rolling was 72.9%.
  • an intermediate annealing was performed at 1060° C. for 80 seconds.
  • cooling was performed at a cooling rate of 40°C/s from 800°C to 350°C.
  • a second cold rolling was performed to finish a cold-rolled sheet having a thickness of 0.27 mm.
  • the total rolling reduction of the second cold rolling was 58.5%. Subsequently, it is degreased by brushing in a 3% sodium orthoate aqueous solution, then pickled in 5% HCl at 60° C.
  • the atmosphere of the final annealing is an N2 atmosphere during the temperature rise up to 900°C, an H2 atmosphere from 900°C or higher to 1200°C, and an H2 atmosphere until the cooling temperature reaches 1000°C, and an Ar atmosphere in the subsequent cooling. and
  • the coating adhesion and magnetic properties of the obtained samples were evaluated in the same manner as in Example 1. Since the final plate thickness of this example is different from that of Example 1, it was determined that the iron loss characteristic is excellent if the iron loss W 17/50 , which is significantly dependent on the plate thickness, is 1.000 W/kg or less. Table 3 shows the evaluation results of the film adhesion and magnetic properties of the obtained samples.
  • the magnetic properties are good and the film adhesion is good under the conditions within the range of the present invention.
  • the pre-annealing of the decarburization annealing has an atmosphere-oxidizing P(H 2 O)/P(H 2 ) of 0.3 or more and 0.7 or less
  • the post-annealing has an atmosphere-oxidizing P(H 2 O)/P( H 2 ) was found to be particularly excellent in coating adhesion when the annealing atmosphere is 0.005 or more and 0.2 or less.

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04120215A (ja) * 1990-03-02 1992-04-21 Kawasaki Steel Corp 磁気特性および表面性状に優れた方向性けい素鋼板の製造方法
JPH059580A (ja) * 1991-06-27 1993-01-19 Kawasaki Steel Corp 磁気特性の極めて優れた薄方向性けい素鋼板の製造方法
JPH0776733A (ja) * 1993-06-30 1995-03-20 Kenichi Arai 磁束密度の高い方向性珪素鋼板の製造方法
JPH08143970A (ja) * 1994-11-24 1996-06-04 Kawasaki Steel Corp 方向性けい素鋼板の製造方法
JPH08143963A (ja) * 1994-11-24 1996-06-04 Kawasaki Steel Corp 方向性けい素鋼板の製造方法
JPH11264019A (ja) * 1998-03-18 1999-09-28 Kawasaki Steel Corp 方向性電磁鋼板の製造方法
JP2011246750A (ja) * 2010-05-25 2011-12-08 Nippon Steel Corp 低鉄損一方向性電磁鋼板の製造方法
JP2013139629A (ja) * 2011-12-06 2013-07-18 Jfe Steel Corp 低鉄損方向性電磁鋼板の製造方法
WO2015199211A1 (ja) * 2014-06-26 2015-12-30 新日鐵住金株式会社 電磁鋼板
JP2017106057A (ja) * 2015-12-08 2017-06-15 新日鐵住金株式会社 方向性電磁鋼板の製造方法
WO2020149347A1 (ja) * 2019-01-16 2020-07-23 日本製鉄株式会社 方向性電磁鋼板の製造方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04120215A (ja) * 1990-03-02 1992-04-21 Kawasaki Steel Corp 磁気特性および表面性状に優れた方向性けい素鋼板の製造方法
JPH059580A (ja) * 1991-06-27 1993-01-19 Kawasaki Steel Corp 磁気特性の極めて優れた薄方向性けい素鋼板の製造方法
JPH0776733A (ja) * 1993-06-30 1995-03-20 Kenichi Arai 磁束密度の高い方向性珪素鋼板の製造方法
JPH08143970A (ja) * 1994-11-24 1996-06-04 Kawasaki Steel Corp 方向性けい素鋼板の製造方法
JPH08143963A (ja) * 1994-11-24 1996-06-04 Kawasaki Steel Corp 方向性けい素鋼板の製造方法
JPH11264019A (ja) * 1998-03-18 1999-09-28 Kawasaki Steel Corp 方向性電磁鋼板の製造方法
JP2011246750A (ja) * 2010-05-25 2011-12-08 Nippon Steel Corp 低鉄損一方向性電磁鋼板の製造方法
JP2013139629A (ja) * 2011-12-06 2013-07-18 Jfe Steel Corp 低鉄損方向性電磁鋼板の製造方法
WO2015199211A1 (ja) * 2014-06-26 2015-12-30 新日鐵住金株式会社 電磁鋼板
JP2017106057A (ja) * 2015-12-08 2017-06-15 新日鐵住金株式会社 方向性電磁鋼板の製造方法
WO2020149347A1 (ja) * 2019-01-16 2020-07-23 日本製鉄株式会社 方向性電磁鋼板の製造方法

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