WO2018074531A1 - 電磁鋼板製造用の熱延鋼板およびその製造方法 - Google Patents
電磁鋼板製造用の熱延鋼板およびその製造方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- 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
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- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
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- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- 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
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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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
- H01F1/16—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 in the form of sheets
Definitions
- the present invention relates to a hot-rolled steel sheet (hereinafter, also referred to as a hot-rolled sheet) for producing an electromagnetic steel sheet having a uniform surface property in a hot-rolled coil.
- a grain-oriented electrical steel sheet is a soft magnetic material used as a core material for transformers and generators, and has a crystal structure in which the ⁇ 001> orientation, which is the easy axis of iron, is highly aligned in the rolling direction of the steel sheet. .
- Such a texture preferentially grows grains of the ⁇ 110 ⁇ ⁇ 001> orientation, so-called Goss orientation, during secondary recrystallization annealing during the production process of grain-oriented electrical steel sheets. Formed through secondary recrystallization.
- Patent Document 1 discloses a method using AlN and MnS
- Patent Document 2 discloses a method using MnS and MnSe, both of which are industrially put into practical use.
- Patent Document 3 discloses a method using Pb, Sb, Nb, Te
- Patent Document 4 discloses Zr, Ti, B, Nb, Ta, V, Cr, Each method of using Mo is disclosed.
- Patent Document 5 discloses that the slab component contains acid-soluble Al in an amount of 0.010 to 0.060% and suppresses the N content, thereby suppressing the slab heating to a low temperature and under a proper nitriding atmosphere in the decarburization annealing process.
- a method has been proposed in which (Al, Si) N is precipitated and used as an inhibitor during secondary recrystallization by nitriding. Numerous methods have been proposed in which nitriding is performed in the middle of the process and (Al, Si) N or AlN is used as an inhibitor. Recently, a manufacturing method in which the slab heating temperature exceeds 1300 ° C. has also been disclosed. .
- Patent Document 6 discloses a technique for preferentially recrystallizing Goss-oriented crystal grains in a material that does not contain an inhibitor component. Since this method does not require fine dispersion of the inhibitor in steel, it does not require slab heating at a high temperature, which has been inevitable until then, and has great advantages both in terms of cost and maintenance. However, in a component system having no inhibitor component, it is extremely important to control the annealing temperature during hot-rolled sheet annealing. This is because the temperature dependency of the steel sheet structure is greater than that of the component system having an inhibitor because it has no inhibitor component.
- the slab for manufacturing electrical steel sheets contains a lot of Si
- a scale called Si scale is often locally generated on the steel sheet surface during hot rolling. Therefore, in hot-rolled sheet annealing, the amount of heat given by radiant heat or the like is changed by the Si scale on the surface of the steel sheet, so the surface properties of the hot-rolled sheet may change. As described above, when the surface property of the hot-rolled sheet changes, there are variations in the hot-rolled sheet annealing temperature in the coil, and overheating or insufficient heating is promoted by feedback control.
- Patent Document 7 proposes a technique for producing a hot-rolled steel sheet that is excellent in surface properties of Si: 0.40 to 2.0 mass%, although it is a method for producing a high-strength hot-rolled steel sheet.
- Si 0.40 to 2.0 mass%
- Japanese Patent Publication No.40-15644 Japanese Patent Publication No.51-13469 Japanese Patent Publication No.38-8214 JP-A-52-24116 Japanese Patent No. 2782086 JP 2000-129356 JP Japanese Patent No. 2689810
- the present invention advantageously solves the above problem, and effectively suppresses changes in surface properties (color tone) in the hot-rolled coil due to the Si scale, thereby reducing variations in characteristics within the product coil.
- An object is to propose a reduced hot-rolled steel sheet for manufacturing electrical steel sheets together with its advantageous manufacturing method.
- a steel sheet with a scale thickness of 10 to 70 ⁇ m was hot-rolled sheet annealed at 1050 ° C. for 100 seconds, and then cold-rolled to a final sheet thickness of 0.23 mm by one cold rolling.
- a board was used.
- primary recrystallization annealing was performed in a humid atmosphere of 55 vol% H 2 -45 vol% N 2 , which also served as decarburization at 860 ° C. for 100 seconds. Thereafter, an annealing separator mainly composed of MgO was applied to the steel sheet surface, dried, and then subjected to finish annealing including purification at 1200 ° C. for 5 hours and secondary recrystallization in a hydrogen atmosphere.
- FIG. 1 shows the result of examining the transition of the average value of the magnetic flux density B 8 with the scale thickness after hot rolling as the horizontal axis. As shown in FIG. 1, it was found that the magnetic flux density B 8 was uniform and good when the scale thickness after hot rolling was in the range of 30 to 50 ⁇ m.
- Table 1 shows the results of measuring the lightness L * , chromaticity a * and b * specified in JIS Z 8729 for the surface scale after hot rolling.
- the lightness L * is 30 ⁇ L * ⁇ 50 and the chromaticities a * and b * are ⁇ 1 ⁇ a * ⁇ 2 and ⁇ 5 ⁇ b, respectively.
- * ⁇ 3 and the color difference ⁇ E ab * with a scale thickness of 40 ⁇ m as a reference is within the range of ⁇ E ab * ⁇ 8, and it has been found that the color of the surface scale affects the variation of the magnetic flux density B 8 . .
- the reason why the variation in the magnetic flux density B 8 in the product plate is reduced by reducing the color difference of the surface scale of the hot-rolled plate is not necessarily clear, but the present inventors consider as follows. That is, the color of the surface scale of the hot rolled sheet affects the amount of radiant heat obtained by the steel sheet in the hot rolled sheet annealing. Therefore, when steel plates with different surface colors are annealed in a continuous furnace under the same conditions, the amount of heat obtained is locally different, resulting in a difference in soaking temperature, which leads to variations in the magnetic flux density B 8 on the product plate. It was.
- the gist configuration of the present invention is as follows. 1.
- a hot-rolled steel sheet having a scale layer on the surface, the lightness L * defined in JIS Z 8781-4: 2013 of the steel sheet surface is 30 ⁇ L * ⁇ 50, and the chromaticities a * and b * are respectively Satisfies the range of ⁇ 1 ⁇ a * ⁇ 2, ⁇ 5 ⁇ b * ⁇ 3, Furthermore, the color difference ⁇ E ab * defined in JIS Z 8781-4: 2013 satisfies ⁇ E ab * ⁇ 8 at the center and the opposite end of the coil with respect to one end in the longitudinal direction of the hot-rolled coil. Hot rolled steel sheet for manufacturing electrical steel sheets.
- the composition of the hot-rolled steel sheet includes, by mass, C: 0.02 to 0.08%, Si: 2.0 to 5.0%, Mn: 0.02 to 1.0%, acid-soluble Al: 0.01% or less, and S: 0.0015 to 0.01% And N is suppressed to less than 0.006%, and the hot rolled steel sheet for producing the electrical steel sheet according to 1 above, comprising the remainder Fe and inevitable impurities.
- the hot-rolled steel sheet is further mass%, Ni: 1.5% or less, Cu: 1.0% or less, Cr: 0.5% or less, P: 0.5% or less, Sb: 0.5% or less, Sn: 0.5% or less, Bi: 0.5 % Or less, Mo: 1.0% or less, Ti: 0.05% or less, Nb: 0.1% or less, V: 0.1% or less, B: 0.0025% or less, Te: 0.01% or less and Ta: 0.01% or less 1
- the hot-rolled steel sheet for producing the electrical steel sheet according to 2 above containing seeds or two or more kinds.
- the outlet temperature in the first stage of rolling to a thickness of 100mm or less is set to 950 ° C or higher, and the second rolling is continued to a thickness of 3.0mm or lower.
- the surface scale of the steel sheet after the second stage rolling is based on one end in the longitudinal direction of the hot rolled coil, and the difference in the thickness of the surface scale at the center and the opposite end of the coil is suppressed to less than 25 ⁇ m, respectively.
- a method for manufacturing a hot-rolled steel sheet for manufacturing an electromagnetic steel sheet In hot rolling after slab heating in the range of 1180 ° C or higher and 1300 ° C or lower, the outlet temperature in the first stage of rolling to a thickness of 100mm or less is set to 950 ° C or higher, and the second rolling is continued to a thickness of 3.0mm or lower.
- the surface scale of the steel sheet after the second stage rolling is based on one end in the longitudinal direction of the
- the present invention by controlling the color of the surface scale of the hot-rolled sheet, it is possible to obtain a hot-rolled steel sheet for manufacturing an electromagnetic steel sheet with reduced temperature non-uniformity in the longitudinal direction in hot-rolled sheet annealing. it becomes possible to variation of the magnetic flux density B 8 of the inner obtain a small grain-oriented electrical steel sheet.
- C 0.02 to 0.08% If C is less than 0.02%, ⁇ - ⁇ phase transformation does not occur, and the carbide itself is reduced, making it difficult to achieve the effect of carbide control. On the other hand, if it exceeds 0.08%, it will be difficult to reduce it to 0.005% or less which does not cause magnetic aging by decarburization annealing. Therefore, C is preferably in the range of 0.02 to 0.08%. More preferably, it is in the range of 0.02 to 0.05%.
- Si 2.0-5.0% Si is an element necessary for increasing the specific resistance of steel and reducing iron loss. If the effect is less than 2.0%, it is not sufficient. On the other hand, if it exceeds 5.0%, the workability is lowered and it is difficult to roll and manufacture. Therefore, Si is preferably in the range of 2.0 to 5.0%. More preferably, it is in the range of 2.5 to 4.5%.
- Mn 0.02 to 1.0% Mn is an element necessary for improving the hot workability of steel. If the effect is less than 0.02%, it is not sufficient. On the other hand, if it exceeds 1.0%, the magnetic flux density of the product plate decreases. Therefore, Mn is preferably in the range of 0.02 to 1.0%. More preferably, it is in the range of 0.05 to 0.7%.
- Acid-soluble Al 0.01% or less Since Al forms a dense oxide film on the surface and may inhibit decarburization, Al is preferably suppressed to 0.01% or less in terms of acid-soluble Al. Desirably, it is 0.008% or less.
- S 0.0015-0.01% S forms MnS and Cu 2 S, and at the same time, suppresses grain growth as solute S and Se and contributes to stabilization of magnetic properties. If S is less than 0.0015%, the amount of dissolved S becomes insufficient and the magnetic properties become unstable. On the other hand, if it exceeds 0.01%, the solid solution of the precipitate in the slab heating before hot rolling becomes insufficient, resulting in poor magnetic properties.
- S is preferably in the range of 0.0015 to 0.01%. Further, S has an effect of improving descaling property, and is desirably in the range of 0.002 to 0.01%.
- N Less than 0.006% Since N may cause defects such as blisters during slab heating, it is preferably suppressed to less than 0.006%.
- Ni 1.5% or less
- Cu 1.0% or less
- Cr 0.5% or less
- P 0.5% or less
- Sb 0.5% or less
- Sn for the purpose of improving magnetic properties : 0.5% or less
- Bi 0.5% or less
- Mo 1.0% or less
- Ti 0.05% or less
- Nb 0.1% or less
- V 0.1% or less
- B 0.0025% or less
- Te 0.01% or less
- Ta 0.01 % Or less selected from 1% or less.
- Ni 0.5% or less
- Cu 0.8% or less
- Cr 0.15% or less
- P 0.15% or less
- Sb 0.15% or less
- Sn 0.15% or less
- Bi 0.2% or less
- Mo 0.1% or less
- Ti 0.01% or less
- Nb 0.05% or less
- V 0.05% or less
- B 0.0020% or less
- Te 0.005% or less
- Ta 0.005% or less.
- the molten steel having the above-described composition is melted by a conventional refining process, and then made into a steel material (slab) by a conventionally known ingot-bundling rolling method or continuous casting method. Alternatively, it may be a thin cast piece having a thickness of 100 mm or less by a direct casting method.
- the slab is heated to a temperature of 1180 ° C. or higher and 1300 ° C. or lower according to a conventional method, and then subjected to hot rolling. In addition, you may use for hot rolling immediately, without heating, if it is not falling from the temperature range after casting.
- Hot rolling is divided into two stages, and it is essential to perform descaling between them. This descaling is performed with high-pressure water, and it is important to keep the scale thickness after hot rolling to a scale thickness difference of less than 25 ⁇ m in the longitudinal direction. At this time, by performing the first stage rolling at a delivery temperature of 950 ° C. or higher, it is easy to obtain uniform surface properties by descaling. Although the exact reason is not clear, it is considered that the releasability is improved by the presence of S added in the steel in the surface scale. In the case of a thin slab having a thickness of 100 mm or less, hot rolling is performed in one stage, and descaling is performed before the hot rolling.
- a hot-rolled steel sheet for producing electromagnetic steel sheets can be obtained.
- the process for manufacturing a grain-oriented electrical steel sheet is as follows. That is, hot-rolled sheet annealing is performed on the hot-rolled sheet obtained by hot rolling.
- the annealing temperature of this hot-rolled sheet annealing should be in the range of 1000 to 1150 ° C for the cold rolling method and 800 to 1200 ° C for the cold rolling method. Is preferred.
- the hot-rolled sheet annealing temperature is less than 800 ° C., the band structure formed by hot rolling remains, and it becomes difficult to obtain a primary recrystallized structure of sized particles, and the development of secondary recrystallization is inhibited.
- the hot-rolled sheet annealing is performed immediately before the final cold rolling, so that the temperature is preferably 1000 ° C. or higher.
- the hot-rolled sheet annealing temperature exceeds 1200 ° C., the crystal grains after the hot-rolled sheet annealing are excessively coarsened, so that it becomes difficult to obtain a primary recrystallized structure of sized particles. For this reason, it is desirable to set it as 1200 degrees C or less.
- the hot-rolled sheet annealing is performed immediately before the final cold rolling, so it is desirable to set the temperature to 1100 ° C. or less.
- the holding time in this temperature range requires 10 seconds or more to make the structure uniform after hot-rolled sheet annealing, but even if held for a long time, there is no effect of improving the magnetic properties. From the point of view, it is desirable to use up to 300 seconds.
- hot-rolled sheet annealing in a continuous annealing furnace by connecting hot-rolled sheets with similar color tone and thickness of the hot-rolled sheet, not only for one coil but also for multiple coils, a precise temperature Control becomes possible.
- cold-rolled sheet with the final thickness is obtained by cold-rolling once or cold-rolling two or more times with intermediate annealing.
- the annealing temperature of the intermediate annealing is preferably in the range of 900 to 1200 ° C.
- the temperature is lower than 900 ° C.
- the recrystallized grains after intermediate annealing become finer, and the Goss nuclei in the primary recrystallized structure tend to decrease and the magnetic properties of the product plate tend to deteriorate.
- the temperature exceeds 1200 ° C. the crystal grains become excessively coarse as in the case of hot-rolled sheet annealing, and it becomes difficult to obtain a primary recrystallized structure of sized grains.
- the intermediate annealing before the final cold rolling is desirably in the temperature range of 1000 to 1150 ° C, and the holding time is 10 seconds or more for homogenizing the structure after the hot-rolled sheet annealing, but it is held for a long time.
- the time since there is no effect of improving the magnetic properties, it is desirable that the time be up to 300 seconds from the viewpoint of operation cost.
- the rolling reduction is 80 to 95% in order to sufficiently develop the ⁇ 111> // ND orientation in the structure of the primary recrystallization annealed sheet. It is preferable.
- the cold-rolled sheet with the final thickness is then subjected to primary recrystallization annealing.
- This primary recrystallization annealing may also serve as decarburization annealing.
- the annealing temperature is preferably in the range of 800 to 900 ° C.
- the atmosphere is preferably a humid atmosphere.
- the recrystallized nuclei of Goss orientation grains can be increased and the iron loss can be reduced. This makes it possible to manufacture grain-oriented electrical steel sheets having both magnetic flux density and low iron loss.
- the heating rate at this time exceeds 400 ° C./s, randomization of the texture occurs and the magnetic properties are deteriorated. Therefore, the heating rate is set to 30 ° C./s or more and 400 ° C./s or less. It is preferable. Desirably, it is 50 ° C./s or more and 300 ° C./s or less.
- Steel sheets that have undergone primary recrystallization annealing are coated with MgO-based annealing separator on the steel sheet surface, dried, and then subjected to finish annealing to develop a secondary recrystallized structure that is highly integrated in the Goss orientation.
- a forsterite film is formed.
- the annealing temperature of the finish annealing is preferably 800 ° C. or higher for the purpose of secondary recrystallization, and is preferably maintained at a temperature of 800 ° C. or higher for 20 hours or more to complete the secondary recrystallization.
- the steel sheet is then subjected to water washing, brushing, pickling, etc. to remove the unreacted annealing separator adhering to the steel sheet surface, and then flattening annealing to correct the shape.
- This is effective in reducing the loss.
- finish annealing is generally performed in a coil state, so that the coil has wrinkles, which may cause deterioration in characteristics when measuring iron loss.
- it is effective to form an insulating film on the surface of the steel plate before or after the flattening annealing.
- a method of applying a tension film through a binder or a method of depositing an inorganic substance on the surface of a steel sheet by a physical vapor deposition method or a chemical vapor deposition method has excellent film adhesion and remarkably iron. Insulating film with large loss reduction effect can be formed
- thermal strain is formed linearly or in a sequence of dots by forming grooves in the final product plate, or by electron beam irradiation, laser irradiation, plasma irradiation, etc.
- a method of introducing impact strain a method of forming a groove by etching the steel plate surface in an intermediate process, such as a steel plate cold-rolled to the final plate thickness, or the like can be used.
- Example 1 A plurality of steel slabs containing C: 0.06%, Si: 2.8%, Mn: 0.08%, acid-soluble Al: 0.005%, N: 0.004% and S: 0.01%, comprising the balance Fe and inevitable impurities, After heating to 1230 ° C., a hot-rolled sheet having a thickness of 2.2 mm was obtained by hot rolling.
- the conditions for hot rolling are as described in Table 2.
- the scale thickness was adjusted by descaling with high-pressure water before the second stage of hot rolling. Next, after hot-rolled sheet annealing at 1000 ° C. for 100 seconds, intermediate rolling for 10 seconds at 1060 ° C.
- the primary recrystallization annealing was performed at 850 ° C. for 100 seconds in a humid atmosphere of ⁇ 45 vol% N 2 . Thereafter, an annealing separator mainly composed of MgO was applied to the surface of the steel sheet, dried, and then subjected to finish annealing including purification treatment and secondary recrystallization at 1200 ° C. for 5 hours in a hydrogen atmosphere.
- Example 2 A steel slab having the component composition shown in Table 3 was heated to 1300 ° C. to form a hot-rolled sheet having a thickness of 2.2 mm by two-stage hot rolling.
- the outlet temperature in the first stage of hot rolling was 1050 ° C.
- VSB vertical scale breaker
- the scale thickness of the hot-rolled sheet was controlled in the range of 30 to 50 ⁇ m.
- a cold-rolled sheet having a final sheet thickness of 0.23 mm was obtained by one cold rolling.
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Abstract
Description
例えば、特許文献1にはAlN、MnSを使用する方法が、また特許文献2にはMnS、MnSeを使用する方法がそれぞれ開示され、いずれも工業的に実用化されている。これらのインヒビターを用いる方法は、1300℃以上の高温でのスラブ加熱を必要とするが、安定して二次再結晶粒を発達させるのには極めて有用な方法であった。さらに、これらのインヒビターの働きを強化するために、特許文献3にはPb、Sb、Nb、Teを利用する方法が、特許文献4にはZr、Ti、B、Nb、Ta、V、Cr、Moを利用する方法がそれぞれ開示されている。
<実験>
質量%で、C:0.05%、Si:3.0%、Mn:0.1%、酸可溶性Al:0.005%、N:0.002%およびS:0.005%を含有し、残部はFeおよび不可避的不純物からなる鋼スラブを、1270℃に加熱し、第一段階の熱間圧延で80mm厚とし、ついで第二段階の熱間圧延で板厚2.5mmの熱延板とした。このとき、第一段階の熱延後に高圧水によるデスケーリングを行い、その水圧を変化させることでスケール厚を変更した。
次いで、連続式の焼鈍炉で、スケール厚が10~70μmの鋼板について1050℃、100秒の条件で熱延板焼鈍を施したのち、1回の冷間圧延により最終板厚0.23mmの冷延板とした。次いで、55vol%H2-45vol%N2の湿潤雰囲気下で860℃、100秒の脱炭を兼ねた一次再結晶焼鈍を施した。その後、MgOを主体とする焼鈍分離剤を鋼板表面に塗布し、乾燥した後、水素雰囲気下で1200℃、5時間の純化と二次再結晶とを含む仕上げ焼鈍を施した。
熱間圧延後のスケール厚を横軸にして磁束密度B8の平均値の推移について調べた結果を、図1に示す。
図1に示したとおり、熱延後のスケール厚が30~50μmの範囲で磁束密度B8が均一で良好であることが分かった。
表1に示したとおり、磁束密度のバラつきが小さい範囲では、明度L*が30≦L*≦50で、かつ色度a*、b*がそれぞれ-1≦a*≦2、-5≦b*≦3で、さらにスケール厚40μmを基準とした色差ΔEab *は、ΔEab *≦8の範囲に収まっており、表面スケールの色が磁束密度B8のバラツキに影響を及ぼすことが判明した。
すなわち、熱延板の表面スケールの色は、熱延板焼鈍において鋼板が得る輻射熱量に影響を与える。そのため同じ条件の連続炉で、表面の色が異なる鋼板を焼鈍した場合、得られる熱量が局所的に異なるため、均熱温度に差が生じ、これが製品板における磁束密度B8のバラツキにつながっていた。この点、今回のように熱間圧延中にスケール厚を制御して、熱延板の表面スケールの色を均一に保つことで、熱延板焼鈍において精密な温度制御が可能となり、これにより製品板における磁束密度B8のバラツキが小さくなったものと考えられた。
本発明は、上記の知見に基づき、さらに検討を重ねた末に完成されたものである。
1.表面にスケール層を有する熱延鋼板であって、該鋼板表面のJIS Z 8781-4:2013に規定される明度L*が30≦L*≦50で、かつ色度a*、b*がそれぞれ-1≦a*≦2、-5≦b*≦3の範囲を満足し、
さらに、熱延コイルの長手方向の一端部を基準とし、該コイルの中央部および反対側端部におけるJIS Z 8781-4:2013に規定される色差ΔEab *がΔEab *≦8をそれぞれ満足する電磁鋼板製造用の熱延鋼板。
1180℃以上1300℃以下の範囲でのスラブ加熱後の熱間圧延において、厚み100mm以下まで圧延する第一段階の圧延における出側温度を950℃以上とし、引き続く厚み3.0mm以下まで圧延する第二段階の圧延の前に、高圧水によるデスケーリングを行い、
前記第二段階の圧延後における鋼板の表面スケールが、熱延コイルの長手方向の一端部を基準とし、該コイルの中央部および反対側端部における表面スケールの厚みの差を25μm未満にそれぞれ抑制する電磁鋼板製造用の熱延鋼板の製造方法。
まず、本発明を鋼素材(スラブ)として好適な成分組成について説明する。なお、成分組成を表す%は、とくに断らない限り質量%を意味するものとする。
Cは、0.02%に満たないと、α-γ相変態が起きず、また炭化物そのものが減少して炭化物制御による効果が表れにくくなる。一方、0.08%を超えると、脱炭焼鈍で磁気時効の起こらない0.005%以下に低減することが困難となる。よって、Cは0.02~0.08%の範囲とするのが好ましい。より好ましくは0.02~0.05%の範囲である。
Siは、鋼の比抵抗を高め、鉄損を低減するのに必要な元素である。上記効果は、2.0%未満では十分ではなく、一方5.0%を超えると加工性が低下し、圧延して製造することが困難となる。よって、Siは2.0~5.0%の範囲とするのが好ましい。より好ましくは2.5~4.5%の範囲である。
Mnは、鋼の熱間加工性を改善するために必要な元素である。上記効果は、0.02%未満では十分ではなく、一方1.0%を超えると製品板の磁束密度が低下するようになる。よって、Mnは0.02~1.0%の範囲とするのが好ましい。より好ましくは0.05~0.7%の範囲である。
Alは、表面に緻密な酸化膜を形成し、脱炭を阻害することがあるため、Alは酸可溶性Al量で0.01%以下に抑制することが好ましい。望ましくは0.008%以下である。
Sは、MnS、Cu2Sを形成すると同時に、固溶S、Seとして粒成長を抑制し、磁気特性の安定化に寄与する。Sが0.0015%未満であると固溶S量が不足して磁気特性が不安定になり、一方0.01%を超えると熱延前スラブ加熱における析出物の固溶が不十分になり磁気特性が不安定となるので、Sは0.0015~0.01%の範囲とすることが好ましい。さらに、Sはデスケーリング性を高める効果があり、望ましくは0.002~0.01%の範囲である。
Nは、スラブ加熱時にフクレなどの欠陥の原因となることがあるため、0.006%未満に抑制することが好ましい。
これらの成分について、特に好ましくは、Ni:0.5%以下、Cu:0.8%以下、Cr:0.15%以下、P:0.15%以下、Sb:0.15%以下、Sn:0.15%以下、Bi:0.2%以下、Mo:0.1%以下、Ti:0.01%以下、Nb:0.05%以下、V:0.05%以下、B:0.0020%以下、Te:0.005%以下、Ta:0.005%以下である。
前述した成分組成を有する溶鋼を、常法の精錬プロセスで溶製した後、従来公知の造塊-分塊圧延法または連続鋳造法で鋼素材(スラブ)とする。または、直接鋳造法で100mm以下の厚さの薄鋳片としてもよい。
上記スラブは、常法に従い、1180℃以上1300℃以下の温度に加熱した後、熱間圧延に供する。なお、鋳造後、その温度域より降温していなければ加熱することなく直ちに熱間圧延に供してもよい。
このような場合には、第一段階の熱間圧延の前にスケール・ブレーカーによってスラブ表面の1次スケールを破壊することが有効である。これにより、熱間圧延の第一段階後のデスケーリングが容易となり、また新たに生成したスケールも剥離しやすくなる。
その後、方向性電磁鋼板を製造するための工程は、以下のとおりである。
すなわち、熱間圧延して得た熱延板に熱延板焼鈍を施す。この熱延板焼鈍の焼鈍温度は、良好な磁気特性を得るためには、冷延1回法の場合は1000~1150℃、冷延2回法の場合は800~1200℃の範囲とするのが好ましい。熱延板焼鈍温度が800℃未満では、熱間圧延で形成されたバンド組織が残留し、整粒の一次再結晶組織を得ることが難しくなり、二次再結晶の発達が阻害される。冷延1回法の場合には熱延板焼鈍が最終冷間圧延直前の焼鈍であるため、1000℃以上であることが望ましい。一方、熱延板焼鈍温度が1200℃を超えると、熱延板焼鈍後の結晶粒が過度に粗大化して、やはり整粒の一次再結晶組織を得ることが難しくなる。このため、1200℃以下とすることが望ましい。特に冷延1回法の場合には熱延板焼鈍が最終冷間圧延直前の焼鈍であるため、1100℃以下とすることが望ましい。この温度範囲での保持時間は、熱延板焼鈍後の組織の均一化のためには10秒以上を必要とするが、長時間保持しても磁気特性向上の効果はないため、操業コストの観点から300秒までとすることが望ましい。
ここで、熱延板焼鈍を連続焼鈍炉で実施する場合、熱延板の色調・板厚が近い熱延板を繋げることで、コイル1つ分だけでなく、複数のコイルについても精密な温度制御が可能となる。
C:0.06%、Si:2.8%、Mn:0.08%、酸可溶性Al:0.005%、N:0.004%およびS:0.01%を含有し、残部Feおよび不可避的不純物からなる鋼スラブを複数用意し、1230℃に加熱後、熱間圧延により板厚2.2mmの熱延板とした。熱間圧延の条件は表2に記載したとおりである。スケール厚の調整は、熱間圧延第二段階前の高圧水によるデスケーリングにより行った。次いで、1000℃、100秒の熱延板焼鈍後、1060℃、100秒の中間焼鈍を挟む、2回の冷間圧延により最終板厚の0.23mmの冷延板としたのち、55vol%H2-45vol%N2の湿潤雰囲気下で850℃、100秒の脱炭焼鈍を兼ねた一次再結晶焼鈍をした。その後、MgOを主体とする焼鈍分離剤を鋼板表面に塗布し、乾燥した後、水素雰囲気下で1200℃、5時間の純化処理と二次再結晶とを含む仕上げ焼鈍を施した。
得られた結果を、表2に併記する。
また、表2には、熱延鋼板について、JIS Z 8781-4:2013に規定される明度L*、色度a*、b*および色差ΔEab *について調べた結果も併せて示す。
表3に示す成分組成になる鋼スラブを、1300℃に加熱し、2段階の熱間圧延により板厚2.2mmの熱延板とした。熱間圧延の第一段階の圧延における出側温度は1050℃とした。また、スラブ加熱後にVSB(バーティカル・スケール・ブレーカー)を適用し、かつ第一段階の圧延後に高圧水のデスケーリングを行うことによって、熱延板のスケール厚を30~50μmの範囲に制御した。次いで1030℃、100秒の熱延板焼鈍後、1回の冷間圧延により最終板厚:0.23mmの冷延板とした。次いで、55vol%H2-45vol%N2の湿潤雰囲気下で870℃、100秒の脱炭焼鈍を兼ねた一次再結晶焼鈍をした。表3中に、窒素増量(ΔN)欄に記載がある成分系については、一次再結晶焼鈍後にNH3雰囲気ガス中にて窒化を行った。その後、MgOを主体とする焼鈍分離剤を鋼板表面に塗布し、乾燥した後、水素雰囲気下で1200℃、5時間の純化処理と二次再結晶とを含む仕上げ焼鈍を施した
得られた結果を、熱延鋼板の明度L*、色度a*、b*および色差ΔEab *について調べた結果と共に、表4に示す。
Claims (5)
- 表面にスケール層を有する熱延鋼板であって、該鋼板表面のJIS Z 8781-4:2013に規定される明度L*が30≦L*≦50で、かつ色度a*、b*がそれぞれ-1≦a*≦2、-5≦b*≦3の範囲を満足し、
さらに、熱延コイルの長手方向の一端部を基準とし、該コイルの中央部および反対側端部におけるJIS Z 8781-4:2013に規定される色差ΔEab *がΔEab *≦8をそれぞれ満足する電磁鋼板製造用の熱延鋼板。 - 前記熱延鋼板の成分組成が、質量%で、C:0.02~0.08%、Si:2.0~5.0%、Mn:0.02~1.0%、酸可溶性Al:0.01%以下およびSを0.0015~0.01%を含有し、かつNを0.006%未満に抑制し、残部Feおよび不可避的不純物からなる請求項1に記載の電磁鋼板製造用の熱延鋼板。
- 前記熱延鋼板が、さらに質量%で、Ni:1.5%以下、Cu:1.0%以下、Cr:0.5%以下、P:0.5%以下、Sb:0.5%以下、Sn:0.5%以下、Bi:0.5%以下、Mo:1.0%以下、Ti:0.05%以下、Nb:0.1%以下、V:0.1%以下、B:0.0025%以下、Te:0.01%以下およびTa:0.01%以下のうちから選ばれる1種または2種以上を含有する請求項2に記載の電磁鋼板製造用の熱延鋼板。
- 請求項1~3のいずれかに記載の電磁鋼板製造用の熱延鋼板の製造方法であって、
1180℃以上1300℃以下の範囲でのスラブ加熱後の熱間圧延において、厚み100mm以下まで圧延する第一段階の圧延における出側温度を950℃以上とし、引き続く厚み3.0mm以下まで圧延する第二段階の圧延の前に、高圧水によるデスケーリングを行い、
前記第二段階の圧延後における鋼板の表面スケールが、熱延コイルの長手方向の一端部を基準とし、該コイルの中央部および反対側端部における表面スケールの厚みの差を25μm未満にそれぞれ抑制する電磁鋼板製造用の熱延鋼板の製造方法。 - 前記スラブ加熱後、第一段階の熱間圧延に先立ち、スケール・ブレーカーによる一次スケールの破壊を行う請求項4に記載の電磁鋼板製造用の熱延鋼板の製造方法。
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BR112019007801B1 (pt) | 2023-04-04 |
BR112019007801A2 (pt) | 2019-07-09 |
US20190247902A1 (en) | 2019-08-15 |
KR20190071745A (ko) | 2019-06-24 |
JP6572864B2 (ja) | 2019-09-11 |
CN109844156B (zh) | 2021-02-09 |
JP2018066036A (ja) | 2018-04-26 |
KR102254943B1 (ko) | 2021-05-21 |
EP3530770A4 (en) | 2019-10-09 |
EP3530770A1 (en) | 2019-08-28 |
CN109844156A (zh) | 2019-06-04 |
RU2706268C1 (ru) | 2019-11-15 |
US11577291B2 (en) | 2023-02-14 |
EP3530770B1 (en) | 2022-12-07 |
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