WO2013024874A1 - 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 PDFInfo
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- WO2013024874A1 WO2013024874A1 PCT/JP2012/070758 JP2012070758W WO2013024874A1 WO 2013024874 A1 WO2013024874 A1 WO 2013024874A1 JP 2012070758 W JP2012070758 W JP 2012070758W WO 2013024874 A1 WO2013024874 A1 WO 2013024874A1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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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
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—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
- C22C—ALLOYS
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- 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
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
- C23C22/33—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also phosphates
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
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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
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic 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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
Definitions
- the present invention relates to a method for producing a grain-oriented electrical steel sheet, and more specifically, to a method for producing a grain-oriented electrical steel sheet having excellent iron loss characteristics and coating characteristics over the entire length of a product coil.
- coating refers to a ceramic coating (hereinafter, also simply referred to as “coating”) mainly composed of forsterite (Mg 2 SiO 4 ), and “coating characteristics” refers to It means the appearance quality of the film, such as the presence or absence of color unevenness or point film defects.
- Electrical steel sheets are soft magnetic materials that are widely used as iron core materials for transformers and generators.
- grain oriented electrical steel sheets are highly integrated in the ⁇ 110 ⁇ ⁇ 001> orientation, which is called the Goss orientation, and have good iron loss characteristics that directly lead to reduction of energy loss in transformers and generators. have.
- As means for improving the iron loss characteristics reduction of the plate thickness, increase of the specific resistance by addition of Si, etc., improvement of the orientation of the crystal orientation, application of tension to the steel plate, smoothing of the steel plate surface, secondary regeneration It is known that crystal grain refinement and magnetic domain refinement are effective.
- the temperature of the front region in the annealing process is set to 775 to 840 ° C., which is lower than the temperature achieved in the rapid heating, and the subsequent rear region is subjected to decarburization annealing at 815 to 875 ° C., which is higher than the front region.
- a technique for obtaining a grain-oriented electrical steel sheet is disclosed in Patent Document 2, and a non-oxidizing atmosphere in which PH 2 O / PH 2 is 0.2 or less immediately before decarburizing and annealing a steel sheet rolled to a final thickness is disclosed in Patent Document 2.
- a technique for obtaining a grain-oriented electrical steel sheet having a low iron loss by heat treatment at a heating rate of 100 ° C./s or higher to a temperature of 700 ° C. or higher is disclosed.
- Patent Document 3 discloses that a temperature range of at least 600 ° C. in the temperature rising stage of the decarburization annealing process is heated to 800 ° C. or higher at a temperature rising rate of 95 ° C./s or more, and the atmosphere in this temperature range is It is composed of an inert gas containing oxygen at a volume fraction of 10 ⁇ 6 to 10 ⁇ 1 , and the constituents of the atmosphere during soaking of the decarburization annealing are H 2 and H 2 O or H 2 and H 2 O.
- An inert gas, PH 2 O / PH 2 is set to 0.05 to 0.75, and an atmospheric flow rate per unit area is set to 0.01 to 1 Nm 3 / min ⁇ m 2 .
- Patent Document 4 A technique for producing an electromagnetic steel sheet having excellent film characteristics and magnetic characteristics by controlling the deviation angle of the crystal grain orientation of the steel sheet crystal grains in the mixed region from the Goss direction to an appropriate range is disclosed in Patent Document 4, At least 65 of the heating stage of the carbon annealing process An inert gas that heats a temperature range of 0 ° C. or higher to 800 ° C.
- H 2 and H 2 O, or H 2 and H 2 O and inert gas are used as the components of the atmosphere during the soaking of the decarburization annealing, and PH 2 O / PH 2 is set to 0.15 to 0. .65, the discharge time in which the emission intensity of Al in the GDS analysis of the film shows a peak and the discharge time in which the emission intensity of Fe shows 1/2 of the bulk value are controlled within an appropriate range.
- a technique for manufacturing a grain-oriented electrical steel sheet having excellent magnetic properties is disclosed.
- the secondary recrystallized grains are refined and the film properties are improved, but it is still not completely perfect.
- the technique of Patent Document 1 once the temperature is raised to a high temperature, the retention treatment is performed at a temperature lower than the reached temperature, but it is difficult to control the reached temperature, and it often deviates from the target temperature. there were. As a result, there is a problem that the quality varies greatly within the same coil or from coil to coil and lacks stability.
- Patent Document 2 has a PH 2 O / PH 2 of the atmosphere during heating is reduced to 0.2 or less, as disclosed in Patent Document 4, the final film properties Not only the partial pressure ratio PH 2 O / PH 2 between H 2 O and H 2 but also the absolute partial pressure of H 2 O has an effect, so the improvement of the coating properties cannot be said to be sufficient. There is room for improvement.
- Patent Document 3 is characterized in that the orientation of the crystal grains in the mixed region of the coating film and the ground iron is shifted from the Goss orientation, but this may improve the magnetic characteristics of the cut plate. In the case where harmonic components resulting from a complicated magnetization process such as when incorporated in a transformer are superimposed, the magnetic characteristics may be deteriorated. Further, the technique of Patent Document 4 raises the temperature with the same oxygen partial pressure as that of Patent Document 3, so that there is a problem that the orientation of the crystal grains in the mixed region of the coating and the ground iron deviates from the Goss orientation as in Patent Document 3. .
- the Al peak position of the GDS changes due to subtle fluctuations in the steel plate components and manufacturing conditions in the cold rolling process, and is not stable. That is, the Al peak position may shift to the steel sheet surface side due to subtle fluctuations in the components such as Al, C, Si, Mn, etc., the temperature profile and atmosphere during hot-rolled sheet annealing, etc. There is a problem that the film characteristics are not stable.
- the present invention has been made in view of the above-described problems of the prior art, and its purpose is to achieve low iron loss over the entire length of the product coil by refining secondary recrystallized grains,
- An object of the present invention is to propose an advantageous method for producing a grain-oriented electrical steel sheet capable of forming a uniform film.
- the inventors focused on the temperature rising process in the primary recrystallization annealing and the trace component added to the annealing separator, stably refining the secondary recrystallized grains, and We pursued the conditions required to ensure the uniformity of the coating. As a result, it has been found that it is effective to divide the heating process of the primary recrystallization annealing into a low temperature region and a high temperature region, and to control the heating rate in both temperature regions separately to an appropriate range. That is, it has been conventionally known that the secondary recrystallization grain size becomes finer by increasing the temperature increase rate of the primary recrystallization annealing.
- the heating rate of the recovery process which is a process, is set higher than the heating rate in normal decarburization annealing, and the heating rate in the high temperature region where primary recrystallization occurs is 60% or less of the heating rate in the low temperature region. It was found that by restricting to the above, it is possible to avoid the adverse effects due to fluctuations in the manufacturing conditions so far and stably enjoy the iron loss reduction effect. Furthermore, the present inventors have found that a uniform coating can be stably formed by adjusting the amount of trace components added to the annealing separator in an appropriate range in accordance with the temperature increase rate in the high temperature range. Invented the invention.
- the present invention based on the above findings is 1 selected from C: 0.001 to 0.10 mass%, Si: 1.0 to 5.0 mass%, Mn: 0.01 to 1.0 mass%, S and Se. Species or 2 types: 0.01 to 0.05 mass% in total, sol.
- the final sheet thickness is obtained by cold rolling two or more times across the annealing, primary recrystallization annealing, and after applying an annealing separator mainly composed of MgO, finish annealing is performed.
- the temperature increase rate S1 (° C./s) between 500 and 600 ° C. is 100 ° C./s or more, and the temperature increase rate S2 (° C./s) between 600 and 700 ° C. is 30 to 0.6 ⁇ .
- the total content W (mol of MgO) of elements having an ionic radius of 0.6 to 1.3% and an ion-oxygen attractive force of 0.7 to -2 or less contained in the annealing separator. %)
- S2 above Stomach following formula (1); 0.01S2-5.5 ⁇ Ln (W) ⁇ 0.01S2-4.3 (1) It is a manufacturing method of the grain-oriented electrical steel sheet characterized by adjusting so that it may satisfy
- the method for producing a grain-oriented electrical steel sheet according to the present invention is characterized by decarburization annealing after primary recrystallization annealing.
- elements having an ionic radius of 0.6 to 1.3% and an ion-oxygen attractive force of 0.7 to -2 or less are Ca, Sr, Li, and Na. It is characterized by being one or more selected from among them.
- the steel slab in the method for producing a grain-oriented electrical steel sheet according to the present invention further includes Cu: 0.01 to 0.2 mass%, Ni: 0.01 to 0.5 mass%, Cr: 0. .01 to 0.5 mass%, Sb: 0.01 to 0.1 mass%, Sn: 0.01 to 0.5 mass%, Mo: 0.01 to 0.5 mass%, and Bi: 0.001 to 0.1 mass 1 type or 2 types or more chosen from% are characterized by the above-mentioned.
- the steel slab in the method for producing a grain-oriented electrical steel sheet according to the present invention may further include B: 0.001 to 0.01 mass%, Ge: 0.001 to 0.1 mass%, As: 0. 0.005 to 0.1 mass%, P: 0.005 to 0.1 mass%, Te: 0.005 to 0.1 mass%, Nb: 0.005 to 0.1 mass%, Ti: 0.005 to 0.1 mass% % And V: one or more selected from 0.005 to 0.1 mass%.
- secondary recrystallized grains can be refined over the entire length of the product coil of the grain-oriented electrical steel sheet to reduce iron loss, and a uniform coating can be formed over the entire length of the coil.
- Product yield can be greatly improved.
- the iron loss characteristics of a transformer or the like can be greatly improved.
- C 0.001 to 0.10 mass%
- C is a component useful for generating goth-oriented grains, and in order to exhibit such an effect, it needs to contain 0.001 mass% or more.
- C is set in the range of 0.001 to 0.10 mass%. Preferably, it is in the range of 0.01 to 0.08 mass%.
- Si 1.0 to 5.0 mass%
- Si is a component necessary for increasing the electrical resistance of steel and reducing iron loss, stabilizing the iron BCC structure, and enabling heat treatment at high temperatures, and at least 1.0 mass% should be added. I need. However, addition exceeding 5.0 mass% hardens the steel and makes it difficult to cold-roll. Therefore, Si is set in the range of 1.0 to 5.0 mass%. Preferably, it is in the range of 2.5 to 4.0 mass%.
- Mn 0.01 to 1.0 mass% Mn contributes effectively to the improvement of hot brittleness of steel, and when it contains S or Se, it forms a precipitate such as MnS or MnSe and is an element that exhibits a function as an inhibitor. .
- Mn is set to a range of 0.01 to 1.0 mass%. Preferably, it is in the range of 0.04 to 0.40 mass%.
- Al 0.003 to 0.050 mass%
- Al is a useful component that forms AlN in steel and precipitates as a dispersed second phase and acts as an inhibitor. However, the amount added was sol. If the Al content is less than 0.003 mass%, the amount of AlN deposited is not sufficient. On the other hand, if the AlN content exceeds 0.050 mass%, AlN precipitates coarsely and loses its function as an inhibitor. Therefore, Al is sol. Al ranges from 0.003 to 0.050 mass%. Preferably, it is in the range of 0.01 to 0.04 mass%.
- N 0.001 to 0.020 mass%
- N is a component necessary for forming AlN.
- the addition amount is less than 0.001 mass%, the precipitation of AlN is insufficient.
- the addition amount exceeds 0.020 mass%, blistering or the like occurs during slab heating. Therefore, N is set in the range of 0.001 to 0.020 mass%. Preferably, it is in the range of 0.005 to 0.010 mass%.
- S and Se Total 0.01-0.05 mass% S and Se combine with Mn and Cu to form MnSe, MnS, Cu 2-x Se, Cu 2-x S, and precipitate as a dispersed second phase in steel, which is useful as an inhibitor It is an ingredient.
- the total content of these S and Se is less than 0.01 mass%, the above effect cannot be obtained sufficiently.
- the total content exceeds 0.05 mass%, the solid solution during slab heating is incomplete. It also causes surface defects in the product plate. Therefore, S and Se are in the range of 0.01 to 0.05 mass% in both cases of single addition and composite addition.
- the total content is in the range of 0.01 to 0.03 mass%.
- the steel slab of the grain-oriented electrical steel sheet of the present invention further includes Cu: 0.01 to 0.2 mass%, Ni: 0.01 to 0.5 mass%, Cr: 0.01 to 0.00. 5 mass%, Sb: 0.01-0.1 mass%, Sn: 0.01-0.5 mass%, Mo: 0.01-0.5 mass% and Bi: 0.001-0.1 mass% 1 type, or 2 or more types can be contained.
- Cu, Ni, Cr, Sb, Sn, Mo, and Bi are elements that are easily segregated at the grain boundaries and the surface, and are elements having an effect as an auxiliary inhibitor. Can be added.
- the steel slab of the grain-oriented electrical steel sheet according to the present invention may further include B: 0.001 to 0.01 mass%, Ge: 0.001 to 0.1 mass%, As, in addition to the above essential components and optional additional components. : 0.005 to 0.1 mass%, P: 0.005 to 0.1 mass%, Te: 0.005 to 0.1 mass%, Nb: 0.005 to 0.1 mass%, Ti: 0.005 to 0 1 mass% and V: one or more selected from 0.005 to 0.1 mass% can be contained.
- B, Ge, As, P, Te, Nb, Ti, and V also have an effect as an auxiliary inhibitor and are effective elements for further improvement of magnetic properties.
- the addition amount is less than the above-described amount, the effect of suppressing the coarsening of the primary recrystallized grains cannot be sufficiently obtained in the high temperature region of the secondary recrystallization process.
- the addition amount is exceeded, secondary recrystallization failure and poor appearance of the film are likely to occur. Therefore, when adding these elements, it is preferable to add in the said range.
- the grain-oriented electrical steel sheet of the present invention is a steel material (steel slab) obtained by melting steel having the above-described component composition by a conventionally known refining process and using a continuous casting method or an ingot-bundling method. Then, the steel slab is hot-rolled to form a hot-rolled sheet, and if necessary, hot-rolled sheet annealing is performed, and then the final sheet thickness is reduced by one or more cold rollings sandwiching intermediate annealing.
- Cold-rolled sheet after primary recrystallization annealing and decarburization annealing, apply an annealing separator mainly composed of MgO, apply final finish annealing, and then apply and bake insulation coating as necessary
- conventionally well-known methods can be employ
- the temperature increase rate S1 in the low temperature region (500 to 600 ° C.) where recovery, which is a precursor process of primary recrystallization, is set to 100 ° C./s or higher, which is higher than usual, and the high temperature at which primary recrystallization occurs.
- the temperature increase rate S2 in the region (600 to 700 ° C.) is set to 30 ° C./s or more and 60% or less of the temperature increase rate in the low temperature region.
- the deformed structure when S1 is set to 100 ° C./s or more, the deformed structure can be maintained up to a high temperature while the strain energy is high, so that recrystallization of the Goth orientation ⁇ 110 ⁇ ⁇ 001> is performed. It can be caused at a relatively low temperature (around 600 ° C.). This is the reason why S1 is 100 ° C./s or more. Preferably, S1 is 120 ° C./s or higher.
- the amount of ⁇ 111> texture phagocytosed in the Goss orientation ⁇ 110 ⁇ ⁇ 001> is controlled within an appropriate range. is important. That is, if there are too many ⁇ 111> orientations, the growth of secondary recrystallized grains is promoted, and even if there are many nuclei of the Goss orientation ⁇ 110 ⁇ ⁇ 001>, one structure becomes coarse before each grows. If the ⁇ 111> orientation is too small, the secondary recrystallized grains are difficult to grow and may cause secondary recrystallization failure.
- this ⁇ 111> orientation is not as large as the deformation zone, it is generated by recrystallization from the ⁇ 111> fiber structure having higher strain energy than the surroundings.
- the crystal orientation is likely to cause recrystallization next to the Goth orientation ⁇ 110 ⁇ ⁇ 001>. Therefore, if the crystal grains other than the Goss orientation are heated at a high temperature rise rate to a high temperature (700 ° C. or higher) at which primary recrystallization occurs, the Goss orientation ⁇ 110 ⁇ ⁇ 001> or the next easily recrystallized ⁇ 111> After reaching a high temperature while the recrystallization of the orientation is suppressed, all orientations recrystallize at once.
- the temperature increase rate S2 of 600 ° C. to 700 ° C. is set to 0.6 ⁇ S1 ° C./s or less, which is lower than the temperature increase rate specified by S1.
- the heating rate at 600 to 700 ° C. is less than 30 ° C./s, the ⁇ 111> orientation, which is likely to cause recrystallization next to the Goss orientation ⁇ 110 ⁇ ⁇ 001>, increases. There is a risk of coarsening.
- S2 is set to 30 ° C./s or more and 0.6 ⁇ S1 ° C./s or less.
- the lower limit of S2 is 50 ° C./s
- the upper limit is 0.55 ⁇ S1 ° C./s.
- lowering the temperature rising rate S2 in the high temperature region has a good influence not only on the crystal orientation but also on the film formation. This is because the formation of the film starts at about 600 ° C. in the heating process, but rapid heating in this temperature range leads to soaking treatment with insufficient initial oxidation, so rapid oxidation occurs during soaking.
- the sub-scale silica (SiO 2 ) takes a dendritic form extending in a rod shape toward the inside of the steel plate. Even if the final annealing is performed in such a form, SiO 2 is difficult to move to the surface, and forsterite is liberated inside the ground iron, which causes deterioration of magnetic characteristics and film characteristics. Therefore, by reducing S2, it is possible to avoid the adverse effects caused by the rapid heating.
- Patent Documents 1 to 4 disclose techniques for improving the atmosphere during heating. However, since all of them are rapidly heated in a high temperature range of 600 to 700 ° C., the ultimate temperature at the end of the rapid heating is Variation and sub-scale form control become difficult. For this reason, the uniformity of the subscale within the product coil cannot be ensured, and it becomes difficult to obtain a product plate that is excellent in magnetic properties and film properties over the entire length.
- the primary recrystallization annealing is generally often performed in combination with decarburization annealing, but in the present invention, it may be primary recrystallization annealing combined with decarburization annealing, or separately after primary recrystallization annealing. Decarburization annealing may be performed.
- the inhibitor may be reinforced by performing nitriding treatment before or after the primary recrystallization annealing or during the primary recrystallization annealing, but the nitriding treatment can also be applied in the present invention. is there.
- ⁇ Annealing separator> The steel sheet after the primary recrystallization annealing or further decarburization annealing is then applied with an annealing separator and subjected to finish annealing to perform secondary recrystallization.
- the feature of the present invention is that in the annealing separator.
- the content of the minor component to be added is adjusted to an appropriate range in accordance with the temperature rising rate S2, and the minor additive component has an ionic radius of 0.6 to 1.3% and an ion-oxygen attractive force of 0.7%.
- -2 is limited to the following elements.
- elements satisfying such conditions include Ca, Sr, Li, Na and the like, and these may be added alone or in combination of two or more.
- the reason why the ionic radius of the trace element to be added is set in the range of 0.6 to 1.3 cm is that the ionic radius of the magnesium ion of MgO, which is the main component of the annealing separator, is close to 0.78 cm. That is, in the film formation reaction, Mg 2+ ions or O 2 ⁇ ions of MgO in the annealing separator move by diffusion and react with SiO 2 on the steel sheet surface, 2MgO + SiO 2 ⁇ Mg 2 SiO 4 In this reaction, forsterite is generated.
- Mg 2+ ions are substituted during finish annealing, and MgO is caused by lattice mismatch caused by a difference in ionic radius. This is because lattice defects can be introduced into the lattice to facilitate diffusion and promote the reaction. If the ion radius is too large or too small than the above range, a substitution reaction with Mg 2+ ions will not occur, so a reaction promoting effect cannot be expected.
- the ion radius acts on the MgO side
- the ion-oxygen attractive force is that the ionic radius of the atom is R i
- the valence is Z
- the ionic radius of the oxygen ion is R o
- the valence. 2 is a value represented by 2Z / (R i + R o ) 2 , and is an index representing the degree to which the trace element to be added mainly acts on the SiO 2 on the subscale side. Specifically, The smaller this value, the more the concentration of SiO 2 on the surface layer is promoted during finish annealing.
- SiO 2 is considered to move to the steel sheet surface layer through a dissociation-reaggregation process such as Ostwald growth at the time of film formation.
- the ion-oxygen attractive force is 0.7% ⁇ .
- the introduction of 2 or less of the ion, by cutting the coupling of SiO 2 was susceptible to the divergence process, since the increased chance of contact with the MgO SiO 2 is enriched in the surface layer, formation reaction of forsterite is promoted.
- ion - oxygen attraction between is more than 0.7 ⁇ -2, the effect can not be obtained.
- the content of the component satisfying the above condition in the annealing separator is the following (according to the temperature increase rate S2 in the high temperature region of the primary recrystallization annealing, where W (mol%) is the amount added to MgO: 1) Formula; 0.01 ⁇ S2-5.5 ⁇ Ln (W) ⁇ 0.01 ⁇ S2 ⁇ 4.3 (1) It is necessary to control within a range that satisfies the above. This is because if the temperature increase rate S2 in the high temperature range becomes too high, the subscale dendrite-like silica (SiO 2 ) that is formed penetrates deep under the surface layer of the steel sheet. Thus, it is necessary to promote the movement of SiO 2 to the surface of the steel plate during finish annealing.
- the addition amount W of the trace amount added component is adjusted to an appropriate range according to the temperature rising rate S2, and when W becomes lower than the range of the above formula (1), the movement of SiO 2 to the surface layer is promoted.
- the range of the above formula (1) is exceeded, the movement of SiO 2 to the surface proceeds too much, the form of forsterite deteriorates, and the appearance of the film is deteriorated.
- the lower limit of Ln (W) is 0.01 ⁇ S2-5.2, and the upper limit is 0.01 ⁇ S2-4.5.
- titanium oxide, borate, chloride, etc. may be added in addition to the above elements. These have the effect of improving the magnetic properties and the effect of increasing the amount of coating by additional oxidation, and since the effect is independent of the above-mentioned trace components, they can be added in combination.
- the annealing separator is a slurry-like coating solution, applied in a range of 8 to 14 g / m 2 on both sides so that the hydrated water content is in the range of 0.5 to 3.7 mass%, and is dried. It is preferable to do this.
- a magnetic domain fragmentation treatment in which laser, plasma, electron beam or the like is irradiated may be performed.
- the coating strengthening measure of the present invention can be used effectively. That is, in the electron beam irradiation, since the electron beam passes through the coating and raises the surface temperature of the steel sheet, the coating is easily peeled off.
- the present invention can form a uniform and strong film by promoting the forsterite formation reaction, it is possible to suppress film peeling due to electron beam irradiation.
- a steel slab containing Al: 0.03 mass%, N: 0.007 mass%, Cu: 0.2 mass%, and Sb: 0.02 mass% is heated at 1430 ° C. for 30 minutes and then hot-rolled to obtain a sheet thickness of 2.
- a hot-rolled sheet of 2 mm was subjected to 1000 ° C. ⁇ 1 minute hot-rolled sheet annealing, and then cold-rolled to form a cold-rolled sheet having a thickness of 0.23 mm. Thereafter, after heating by varying the temperature rising rate S1 between 500 and 600 ° C. and the temperature rising rate S2 between 600 and 700 ° C.
- decarburization annealing is maintained at 840 ° C. for 2 minutes. After that, the primary recrystallization annealing is performed, and then MgO is the main component, TiO 2 is added at 10 mass%, and as shown in Table 1, elements having different ionic radii and ion-oxygen attractive forces are oxidized.
- An annealing separator added in various amounts in the form of a slurry is applied in a slurry form so that the hydrated water content is 3.0 mass%, applied at 12 g / m 2 (per both sides), dried, and wound on a coil.
- a coating liquid consisting of magnesium phosphate-colloidal silica-chromic anhydride-silica powder is applied, and flattening annealing at 800 ° C. ⁇ 30 seconds is performed for both baking and shape correction of the coating liquid. Apply Product coil.
- Specimens were collected continuously at regular intervals from the length direction of the product coil thus obtained, the iron loss over the entire length of the coil was measured, and the iron loss W 17/50 relative to the total length of the product coil was 0.80 W / The ratio of the part which became kg or less was calculated
- Table 1 shows the above results. From this, the steel sheet of the example of the present invention manufactured under the conditions suitable for the present invention with the heating rate and the trace added component in the annealing separator have a ratio of W 17/50 ⁇ 0.80 W / kg of 70% or more. It can be seen that the ratio of the portion having a good coating appearance is 99% or more of the entire length, and both the magnetic properties and the coating properties are good.
- the slurry was made into a slurry, applied with 12 g / m 2 (per both sides) so that the hydrated water content was 3.0 mass%, dried, wound into a coil, and finally annealed, followed by magnesium phosphate colloid From silica-chromic anhydride-silica powder
- the coating solution was applied, and a product coil subjected to flattening annealing the baked and 800 ° C. ⁇ 20 seconds, which also serves as a straightening of the strip.
- the sample was subjected to stress relief annealing at 800 ° C. ⁇ 3 hr in a nitrogen atmosphere, and then subjected to iron loss W 17 in the Epstein test. / 50 was measured, and the ratio of the portion where the iron loss W 17/50 relative to the total length of the product coil was 0.80 W / kg or less was determined. Further, at the time of collecting the test piece, the surface of the steel plate was visually inspected to confirm the presence or absence of coating defects such as color unevenness and dot-like coating defects, and the ratio to the total length of the non-defective parts without coating defects was determined.
- Table 2 shows the results of the above measurements. From this, the steel sheets of the examples of the present invention manufactured under the conditions that the heating rate and the trace amount added component in the annealing separator are in conformity with the present invention, W 17/50 ⁇ 0.80 W / kg is 70% or more. It can be seen that the ratio of the good portion is 99% or more of the total length, and both the magnetic properties and the film properties are good.
- a steel slab containing Al: 0.03 mass%, N: 0.007 mass%, Cu: 0.2 mass%, and Sb: 0.02 mass% is heated at 1430 ° C. for 30 minutes and then hot-rolled to obtain a sheet thickness of 2.
- a hot-rolled sheet of 2 mm was subjected to 1000 ° C. ⁇ 1 minute hot-rolled sheet annealing, and then cold-rolled to form a cold-rolled sheet having a thickness of 0.23 mm. After that, the temperature is raised to 700 ° C. with a temperature rising rate S1 between 500 ° C. and 600 ° C.
- an annealing separator having an ionic radius of 1.3 ⁇ ⁇ ⁇ and an ion-oxygen attractive force of 0.55 ⁇ - 2 added in various amounts in the form of an oxide was made into a slurry to give a hydration amount of 3.0 mass.
- the coating liquid consisting of magnesium phosphate-colloidal silica-chromic anhydride-silica powder is applied after 12 g / m 2 is applied (per both sides), dried, wound on a coil, and finally annealed. Apply, Subjected to flattening annealing of the baked and 800 ° C. ⁇ 20 seconds, which also serves as a straightening, further to the steel sheet surface, and a product coil subjected to magnetic domain refining treatment by electron beam irradiation.
- the iron loss W 17/50 is measured with an SST tester (Single Sheet Tester), and an oil-filled transformer of 1000 kVA is taken from the remaining product coil. Manufactured and measured iron loss in actual transformer. Further, at the time of collecting the cut plate, the steel sheet surface of the entire length of the coil was visually inspected to check for the presence or absence of coating defects such as color unevenness or dotted film defects, and the ratio to the total length of the non-defective parts without coating defects was obtained.
- SST tester Single Sheet Tester
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Abstract
Description
0.01S2-5.5≦Ln(W)≦0.01S2-4.3 ・・・(1)
を満たすよう調整することを特徴とする方向性電磁鋼板の製造方法である。
C:0.001~0.10mass%
Cは、ゴス方位粒を発生させるのに有用な成分であり、斯かる効果を発現させるためには、0.001mass%以上の含有を必要とする。一方、Cが0.10mass%を超えると、後工程の脱炭焼鈍で磁気時効を起こさない0.005mass%以下まで脱炭することが難しくなる。よって、Cは0.001~0.10mass%の範囲とする。好ましくは、0.01~0.08mass%の範囲である。
Siは、鋼の電気抵抗を高めて鉄損を低下させると共に、鉄のBCC組織を安定化させ、高温での熱処理を可能とするために必要な成分であり、少なくとも1.0mass%の添加を必要とする。しかし、5.0mass%を超える添加は、鋼を硬質化し、冷間圧延することを困難とする。よって、Siは、1.0~5.0mass%の範囲とする。好ましくは、2.5~4.0mass%の範囲である。
Mnは、鋼の熱間脆性の改善に有効に寄与すると共に、SやSeを含有している場合には、MnSやMnSe等の析出物を形成し、インヒビタとしての機能を発揮する元素である。Mnの含有量が0.01mass%より少ないと、上記効果が十分に得られず、一方、1.0mass%を超えると、MnSe等の析出物が粗大化してインヒビタとしての効果が失われるようになる。よって、Mnは0.01~1.0mass%の範囲とする。好ましくは、0.04~0.40mass%の範囲である。
Alは、鋼中でAlNを形成して分散第二相として析出し、インヒビタとして作用する有用成分である。しかし、添加量がsol.Alで0.003mass%未満では、AlNの析出量が十分ではなく、一方、0.050mass%を超えて添加すると、AlNが粗大に析出してインヒビタとしての作用が失われるようになる。よって、Alはsol.Alとして0.003~0.050mass%の範囲とする。好ましくは、0.01~0.04mass%の範囲である。
Nは、Alと同様、AlNを形成するために必要な成分である。しかし、添加量が0.001mass%未満では、AlNの析出が不十分であり、一方、0.020mass%を超えて添加すると、スラブ加熱時にふくれ等を生じるようになる。よって、Nは0.001~0.020mass%の範囲とする。好ましくは、0.005~0.010mass%の範囲である。
SおよびSeは、MnやCuと結合してMnSeやMnS,Cu2-xSe,Cu2-xSを形成し、鋼中に分散第二相として析出し、インヒビタとしての作用を発揮する有用成分である。これらS,Seの合計含有量が0.01mass%未満では、上記の効果が十分には得られず、一方、0.05mass%を超えると、スラブ加熱時における固溶が不完全となるだけでなく、製品板における表面欠陥の原因ともなる。よって、SおよびSeは、単独添加および複合添加のいずれの場合も0.01~0.05mass%の範囲とする。好ましくは、合計で0.01~0.03mass%の範囲である。
Cu,Ni,Cr,Sb,Sn,MoおよびBiは、結晶粒界や表面に偏析しやすい元素であり、補助的なインヒビタとしての作用を有する元素であるため、さらなる磁気特性の向上を目的として添加することができる。しかし、いずれの元素も、添加量が上記下限値に満たない場合は、二次再結晶過程の高温域で一次再結晶粒の粗大化を抑制する効果が十分ではなく、一方、上記上限値を超える添加は、被膜の外観不良や二次再結晶不良を引き起こすおそれがある。よって、添加する場合には、上記範囲で添加するのが好ましい。
これらのB,Ge,As,P,Te,Nb,TiおよびVも、補助的なインヒビタとしての作用を有し、さらなる磁気特性の改善に有効な元素である。しかし、上記添加量に満たない場合には、二次再結晶過程の高温域で、一次再結晶粒の粗大化を抑制する効果が十分に得られない。一方、上記添加量を超えると、二次再結晶不良や被膜の外観不良を発生しやすくする。よって、これらの元素を添加する場合には、上記範囲で添加するのが好ましい。
本発明の方向性電磁鋼板は、上記に説明した成分組成を有する鋼を従来公知の精錬プロセスで溶製し、連続鋳造法または造塊-分塊圧延法等の方法で鋼素材(鋼スラブ)とし、その後、上記鋼スラブを熱間圧延して熱延板とし、必要に応じて熱延板焼鈍を施した後、1回もしくは中間焼鈍を挟む2回以上の冷間圧延により最終板厚の冷延板とし、一次再結晶焼鈍と脱炭焼鈍を施した後、MgOを主成分とする焼鈍分離剤を塗布し、最終仕上焼鈍を施し、その後、必要に応じて絶縁被膜の塗布・焼付けを兼ねた平坦化焼鈍を経る一連の工程からなる製造方法である。
なお、上記製造方法において、一次再結晶焼鈍および焼鈍分離剤以外の製造条件については、従来公知の方法を採用することができ、特に制限はない。よって、本発明における一次再結晶焼鈍条件および焼鈍分離剤の条件について以下に説明する。
最終板厚まで圧延した冷延板を一次再結晶焼鈍する条件、特に加熱過程における昇温速度は、先述したように、二次再結晶組織に大きな影響を及ぼすため、厳密な制御が必要とされる。そこで、本発明においては、二次再結晶粒を製品コイル全長に亘って安定的に細粒化し、製品コイル内の鉄損特性に優れる領域の比率を高めるため、上記加熱過程を、回復が進行する低温域と、一次再結晶が起こる高温域とに分け、それぞれの領域の昇温速度を適正に制御することとした。
ここで、一次再結晶焼鈍の加熱過程の低温域(500~600℃)における昇温速度S1が100℃/s未満の場合には、歪エネルギーがきわめて高い変形帯では、優先的に回復(歪エネルギーの緩和)が生じるため、ゴス方位{110}<001>の再結晶を促進させることができない。これに対して、S1を100℃/s以上とした場合には、歪エネルギーが高い状態のままで変形組織を高温まで保持することができるので、ゴス方位{110}<001>の再結晶を比較的低温(600℃近傍)で起こさせることができる。これがS1を100℃/s以上とする理由である。好ましくは、S1は120℃/s以上である。
逆に、600~700℃の昇温速度を30℃/s未満にすると、ゴス方位{110}<001>に次いで再結晶を起こしやすい<111>方位が増加するので、二次再結晶粒が粗大化するおそれがある。以上が、S2を30℃/s以上0.6×S1℃/s以下とする理由である。好ましくは、S2の下限は50℃/sであり、また、上限は0.55×S1℃/sである。
また、一次再結晶焼鈍は、一般に脱炭焼鈍と兼ねて行われることが多いが、本発明においても、脱炭焼鈍と兼ねた一次再結晶焼鈍としてもよく、あるいは、別々として一次再結晶焼鈍後に脱炭焼鈍を施してもよい。
さらに、一次再結晶焼鈍の前または後、あるいは、一次再結晶焼鈍中に窒化処理を施してインヒビタを補強することが行われることがあるが、本発明においても窒化処理を適用することは可能である。
上記一次再結晶焼鈍あるいはさらに脱炭焼鈍後の鋼板は、その後、焼鈍分離剤を塗布し、仕上焼鈍を施して二次再結晶させるが、本発明の特徴は、この際、焼鈍分離剤中に添加する微量成分の含有量を上記昇温速度S2に合わせて適正範囲に調節すると共に、上記微量添加成分を、イオン半径が0.6~1.3Åで、イオン-酸素間引力が0.7Å-2以下の元素に限定するところにある。ここで、このような条件を満たす元素としては、Ca,Sr,LiおよびNa等があり、これらは単独または2種以上を複合して添加してもよい。
2MgO+SiO2 → Mg2SiO4
となり、フォルステライトを生成する反応であるが、イオン半径が上記範囲にある元素を導入することで、仕上焼鈍中にMg2+イオンと置換させると共に、イオン半径の違いから生じる格子の不整合によりMgO格子中に格子欠陥を導入して拡散を起こし易くし、上記反応を促進させることができるからである。イオン半径が、上記範囲より大き過ぎたり、小さ過ぎたりすると、Mg2+イオンとの置換反応が起こらないため反応促進効果は期待できない。
すなわち、SiO2は、被膜形成の際に、オストワルド成長のような乖離-再凝集過程を経て鋼板表層に移動していくものと考えられるが、ここに、イオン-酸素間引力が0.7Å-2以下のイオンを導入すると、SiO2の結合を切断して上記乖離過程を起こし易くし、SiO2が表層に濃化してMgOとの接触の機会が高まるため、フォルステライトの形成反応が促進される。しかし、イオン-酸素間引力が、0.7Å-2を超えると、上記効果が得られなくなる。
0.01×S2-5.5≦Ln(W)≦0.01×S2-4.3 ・・・(1)
を満たす範囲に制御する必要がある。
というのは、高温域の昇温速度S2が高くなり過ぎると、形成されるサブスケールのデンドライト状シリカ(SiO2)が鋼板表層下に深く入り込むようになるので、上記微量添加成分の量を高めて、仕上焼鈍中にSiO2が鋼板表面に移動するのを促進させてやる必要がある。逆に、S2が低下すると、デンドライト状シリカが深く入り込まないので、上記微量添加成分量が少なくてもSiO2が鋼板表面に移動することができる。したがって、微量添加成分の添加量Wは、昇温速度S2に応じて適正範囲に調整する必要があり、Wが、上記(1)式の範囲よりも低くなると、SiO2の表層への移動促進効果がなくなり、一方、上記(1)式の範囲を超えると、SiO2の表面への移動が進みすぎて、フォルステライトの形態が劣化し、被膜の外観不良を引き起こすようになる。好ましくは、Ln(W)の下限は0.01×S2-5.2、上限は0.01×S2-4.5である。
Claims (5)
- C:0.001~0.10mass%、Si:1.0~5.0mass%、Mn:0.01~1.0mass%、SおよびSeのうちから選ばれる1種または2種:合計0.01~0.05mass%、sol.Al:0.003~0.050mass%およびN:0.001~0.020mass%を含有し、残部がFeおよび不可避的不純物からなる成分組成を有する鋼スラブを熱間圧延し、1回もしくは中間焼鈍を挟む2回以上の冷間圧延して最終板厚とし、一次再結晶焼鈍し、MgOを主成分とする焼鈍分離剤を塗布した後、仕上焼鈍を施す方向性電磁鋼板の製造方法において、
上記一次再結晶焼鈍における500~600℃間の昇温速度S1を100℃/s以上、600~700℃間の昇温速度S2を30~0.6×S1℃/sとすると共に、
上記焼鈍分離剤中に含まれるイオン半径が0.6~1.3Å、イオン-酸素間引力が0.7Å-2以下の元素のMgOに対する総含有量W(mol%)を、上記S2との関係において下記(1)式を満たすよう調整することを特徴とする方向性電磁鋼板の製造方法。
記
0.01S2-5.5≦Ln(W)≦0.01S2-4.3 ・・・(1) - 上記一次再結晶焼鈍後、脱炭焼鈍することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 上記イオン半径が0.6~1.3Å、イオン-酸素間引力が0.7Å-2以下である元素は、Ca,Sr,LiおよびNaのうちから選ばれる1種または2種以上であることを特徴とする請求項1または2に記載の方向性電磁鋼板の製造方法。
- 上記鋼スラブは、上記成分組成に加えてさらに、Cu:0.01~0.2mass%、Ni:0.01~0.5mass%、Cr:0.01~0.5mass%、Sb:0.01~0.1mass%、Sn:0.01~0.5mass%、Mo:0.01~0.5mass%およびBi:0.001~0.1mass%のうちから選ばれる1種または2種以上を含有することを特徴とする請求項1~3のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 上記鋼スラブは、上記成分組成に加えてさらに、B:0.001~0.01mass%、Ge:0.001~0.1mass%、As:0.005~0.1mass%、P:0.005~0.1mass%、Te:0.005~0.1mass%、Nb:0.005~0.1mass%、Ti:0.005~0.1mass%およびV:0.005~0.1mass%から選ばれる1種または2種以上を含有することを特徴とする請求項1~4のいずれか1項に記載の方向性電磁鋼板の製造方法。
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