WO2018131710A1 - 無方向性電磁鋼板及び無方向性電磁鋼板の製造方法 - Google Patents
無方向性電磁鋼板及び無方向性電磁鋼板の製造方法 Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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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- 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
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- H01F1/14708—Fe-Ni based alloys
- H01F1/14733—Fe-Ni based alloys in the form of particles
- H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
- H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
Definitions
- the present invention relates to a non-oriented electrical steel sheet and a method for producing a non-oriented electrical steel sheet.
- Si tends to increase the electrical resistance, resulting in iron loss. It is an element that is effective for the reduction of Therefore, in the said patent document 1, it is disclosed that Si content shall be 6 mass% or less, and in the said patent document 2 and patent document 3, it is disclosed that Si content shall be 5.0 mass% or less. Has been. Patent Documents 1 to 3 also disclose that the Al content is 0.0050% or less and the electrical resistance is increased with Si or Si and Mn to reduce the iron loss.
- Patent Documents 1 to 3 have not been sufficiently reduced (improved) in high-frequency iron loss such as W 10/400 .
- the reason for this is that high alloying is indispensable for reducing high-frequency iron loss.
- Patent Documents 1 to 3 do not discuss high-frequency iron loss. Since the lower limit and distribution of appropriate contents of Si, Al, and Mn are not taken into consideration, it is considered that the reduction of high-frequency iron loss as in W 10/400 was not sufficient.
- An object of the present invention is to provide a non-oriented electrical steel sheet having good cold rollability and excellent magnetic properties, particularly high-frequency iron loss, and a method for producing the non-oriented electrical steel sheet.
- the non-oriented electrical steel sheet according to one aspect of the present invention has a chemical composition of mass%, C: more than 0%, 0.0050% or less, Si: 3.0% to 4.0%, Mn : 1.0% to 3.3%, P: more than 0%, less than 0.030%, S: more than 0%, 0.0050% or less, sol.
- the O content in the central portion of the plate thickness excluding the surface layer portion that is a range from the front surface and the back surface to the position of 10 ⁇ m in the depth direction is less than 0.0100%.
- the chemical composition is mass%, C: more than 0%, 0.0050% or less, Si: 3.0% to 4. 0%, Mn: 1.0% to 3.3%, P: more than 0%, less than 0.030%, S: more than 0%, 0.0050% or less, sol.
- Al more than 0%, 0.0040% or less, N: more than 0%, 0.0040% or less, O: less than 0.0100%, Sn: 0% to 0.050%, Sb: 0% to 0.050 , Ti: more than 0%, 0.0050% or less, the balance being Fe and impurities, Sn + Sb: 0.050% or less, Si-0.5 ⁇ Mn: 2.0% or more
- a cold rolling process for forming a cold-rolled steel sheet, and a finish-annealing process for subjecting the cold-rolled steel sheet to a finish annealing In the finish annealing process, the average in the entire thickness direction of the cold-rolled steel sheet after finish annealing. Finish annealing conditions are controlled so that the O content is 0.0110 mass% or more and 0.0350 mass% or less. It is.
- the dew point of the atmosphere at the time of temperature rise and soaking is within a range of ⁇ 10 ° C. to 40 ° C. in the finish annealing step. May be controlled.
- Al is an alloying element that exhibits an effect of increasing electric resistance like Si.
- Al causes a decrease in cold rollability.
- the Al content increases, the hysteresis loss tends to deteriorate and the magnetic properties tend to deteriorate. Therefore, it is difficult to contain a large amount of Al as an alloy element in the non-oriented electrical steel sheet.
- the inventors of the present invention have sought for a method for improving the cold rolling property while suppressing the deterioration of the magnetic properties, and have made extensive studies. As a result, it is possible to improve the cold rollability and magnetic properties by making Al content below a predetermined value and containing Mn with Si having little adverse effect on cold rollability together with Si. Obtained knowledge. Further, in order to further improve the cold rolling property, it is required to reduce the contents of P, Sn, and Sb that may cause the cold rolling property to be lowered. However, the present inventors have also found that reducing the Sn and Sb contents may promote nitriding during finish annealing and possibly reduce magnetic properties.
- FIG. 1 is a diagram schematically showing the structure of a non-oriented electrical steel sheet according to an embodiment of the present invention
- FIG. 2 shows the structure of the ground iron of the non-oriented electrical steel sheet according to an embodiment of the present invention. It is the figure shown typically.
- the non-oriented electrical steel sheet 10 according to the present embodiment has a ground iron 11 having a predetermined chemical composition, as schematically shown in FIG.
- the non-oriented electrical steel sheet according to the present embodiment may be composed only of the ground iron 11, it is preferable to further have an insulating coating 13 on the surface of the ground iron 11.
- ground iron 11 of the non-oriented electrical steel sheet 10 will be described in detail.
- the base iron 11 of the non-oriented electrical steel sheet 10 has a chemical composition of mass%, C: more than 0%, 0.0050% or less, Si: 3.0% to 4.0%, Mn : 1.0% to 3.3%, P: more than 0%, less than 0.030%, S: more than 0%, 0.0050% or less, sol.
- Al more than 0%, 0.0040% or less, N: more than 0%, 0.0040% or less, O: 0.0110% to 0.0350%, Sn: 0% to 0.050%, Sb: 0% ⁇ 0.050%, Ti: more than 0%, 0.0050% or less, with the balance being Fe and impurities, Sn + Sb: 0.050% or less, Si-0.5 ⁇ Mn ⁇ 2.0% Satisfied.
- C is an element that is inevitably contained, and is an element that causes iron loss deterioration (increase in iron loss).
- the C content exceeds 0.0050%, iron loss deterioration occurs in the non-oriented electrical steel sheet, and good magnetic properties cannot be obtained. Therefore, in the non-oriented electrical steel sheet according to the present embodiment, the C content is set to 0.0050% or less.
- the C content is preferably 0.0040% or less, and more preferably 0.0030% or less. The smaller the C content, the better.
- C is an inevitably contained element, and the lower limit is made to exceed 0%. Further, if the C content is reduced to less than 0.0005%, the cost is significantly increased. Therefore, the C content may be 0.0005% or more.
- Si silicon
- Si is an element that reduces eddy current loss and improves high-frequency iron loss by increasing the electrical resistance of steel.
- Si has a large solid solution strengthening ability, it is an element effective for increasing the strength of non-oriented electrical steel sheets.
- the Si content needs to be 3.0% or more. Si content becomes like this. Preferably it is 3.1% or more, More preferably, it is 3.2% or more.
- the Si content exceeds 4.0%, the workability is remarkably deteriorated and it is difficult to perform cold rolling, or the steel sheet is broken during the cold rolling (that is, , Cold rollability is reduced). Therefore, the Si content is 4.0% or less.
- the Si content is preferably 3.9% or less, and more preferably 3.8% or less.
- Mn manganese
- Mn manganese
- Si silicon
- the Mn content is preferably 1.2% or more, more preferably 1.4% or more.
- the Mn content is 3.3% or less.
- the Mn content is preferably 3.0% or less, and more preferably 2.8% or less.
- P more than 0%, less than 0.030%
- P phosphorus
- the P content is preferably 0.020% or less, and more preferably 0.010% or less. The smaller the P content, the better.
- P is an element that is inevitably contained, and the lower limit is made to exceed 0%. If the P content is less than 0.001%, a significant cost increase is caused. Therefore, the lower limit is preferably set to 0.001% or more. More preferably, it is 0.002% or more.
- S is an element that increases the iron loss by forming fine precipitates of MnS and degrades the magnetic properties of the non-oriented electrical steel sheet. Therefore, the S content needs to be 0.0050% or less. S content becomes like this. Preferably it is 0.0040% or less, More preferably, it is 0.0035% or less. The smaller the S content, the better. However, S is an element that is unavoidably contained, and the lower limit is made to exceed 0%. Further, if the S content is reduced to less than 0.0001%, a significant cost increase is caused. Accordingly, the S content is preferably 0.0001% or more.
- Al is an element that, when dissolved in steel, reduces eddy current loss and improves high-frequency iron loss by increasing the electrical resistance of the non-oriented electrical steel sheet.
- the non-oriented electrical steel sheet according to the present embodiment positively contains Mn, which is an element that increases the electrical resistance without degrading workability as compared with Al. Therefore, it is not necessary to positively contain Al.
- sol. If the Al (acid-soluble Al) content exceeds 0.0040%, fine nitrides are precipitated in the steel, and the grain growth during hot-rolled sheet annealing or finish annealing is hindered, resulting in deterioration of magnetic properties. Therefore, sol.
- the Al content is 0.0040% or less.
- the Al content is preferably 0.0030% or less, more preferably 0.0020% or less.
- Al is an element inevitably contained, and the lower limit is made over 0%. Also, sol. Attempting to reduce the Al content below 0.0001% results in a significant cost increase. Therefore, sol.
- the Al content is preferably 0.0001% or more.
- N nitrogen
- nitrogen is an element that forms fine nitrides in steel to increase iron loss and degrade the magnetic properties of the non-oriented electrical steel sheet. Therefore, the N content needs to be 0.0040% or less.
- the N content is preferably 0.0030% or less, more preferably 0.0020% or less.
- N is an element inevitably contained, and the lower limit is made over 0%. Further, the smaller the N content, the better. However, if the N content is reduced from 0.0001%, a significant cost increase is caused. Therefore, the N content is preferably 0.0001% or more. More preferably, it is 0.0003% or more.
- O oxygen
- the O content is preferably 0.0115% or more, and more preferably 0.0120% or more.
- the O content exceeds 0.0350%, the oxide layer in the surface layer portion of the steel sheet formed by the introduction of oxygen becomes thick and the magnetic properties deteriorate, which is not preferable. Therefore, the O content is 0.0350% or less.
- the O content is preferably 0.0330% or less, and more preferably 0.0300% or less.
- iron loss increases when a steel sheet is nitrided during finish annealing.
- the surface of the steel sheet is oxidized, nitriding can be suppressed, but the magnetic properties are deteriorated due to the generated oxide. Therefore, conventionally, oxidizing the steel sheet surface has not been performed.
- the total amount of oxygen to be 0.0110 to 0.0350% in a specific component system, nitridation is suppressed and deterioration in magnetic properties due to oxide is minimized. What is suppressed is a knowledge newly found by the present inventors.
- the O content of 0.0110% or more and 0.0350% or less as described above means an average content in the entire thickness direction of the base iron 11 as described in detail below.
- O (oxygen) in the ground iron 11 is mainly introduced into the steel during finish annealing. Therefore, most of the introduced oxygen is present in the surface layer portion of the ground iron 11 as will be described in detail below, and the distribution of oxygen along the thickness direction is not uniform.
- the oxygen content (O content) other than the surface layer portion of the base iron 11 will be described again below.
- Sn and Sb are elements useful for ensuring low iron loss by segregating on the surface of the steel sheet and suppressing nitriding during annealing. Therefore, in the non-oriented electrical steel sheet according to the present embodiment, it is preferable that at least one of Sn and Sb is contained in the ground iron 11 in order to obtain such an effect.
- the Sn content is preferably 0.005% or more, and more preferably 0.010% or more.
- the Sb content is preferably 0.005% or more, and more preferably 0.010% or more.
- the contents of Sn and Sb are each preferably 0.050% or less.
- the Sn content is more preferably 0.040% or less, and still more preferably 0.030% or less. Further, the Sb content is more preferably 0.040% or less, and still more preferably 0.030% or less.
- Sn + Sb 0.050% or less
- Sn and Sb are elements that cause a decrease in cold rollability when excessively contained in the ground iron 11.
- the total content of Sn and Sb is set to 0.050% or less.
- the total content of Sn and Sb is preferably 0.040% or less, and more preferably 0.030% or less.
- Ti over 0%, 0.0050% or less
- Ti titanium
- Ti is an element that combines with C, N, O, etc. in the ground iron to form fine precipitates such as TiN, TiC, Ti oxide, etc., and inhibits the growth of crystal grains during annealing, thereby deteriorating magnetic properties. It is. Therefore, the Ti content is 0.0050% or less. Preferably it is 0.0040% or less, More preferably, it is 0.0030% or less.
- Ti is an element inevitably contained, and the lower limit is made to exceed 0%. An attempt to make the Ti content less than 0.0003% results in a significant cost increase, so the Ti content is preferably set to 0.0003% or more. More preferably. 0.0005% or more.
- the non-oriented electrical steel sheet according to the present embodiment basically includes the above elements, with the balance being Fe and impurities.
- the non-oriented electrical steel sheet according to the present embodiment may contain elements such as Ni (nickel), Cr (chromium), Cu (copper), and Mo (molybdenum) other than the elements described above. Even if each of these elements is contained in an amount of 0.50% or less, the effect of the non-oriented electrical steel sheet according to the present embodiment is not impaired.
- Ca calcium
- Mg magnesium
- La lanthanum
- Ce cerium
- Pr praseodymium
- Nd neodymium
- elements such as Pb (lead), Bi (bismuth), V (vanadium), As (arsenic), and B (boron) may be contained. Even if these elements are included in the range of 0.0001% to 0.0050%, the effect of the non-oriented electrical steel sheet according to the present embodiment is not impaired.
- Si-0.5 ⁇ Mn: 2.0% or more the content of each element is controlled as described above, and the Si content and the Mn content are controlled to satisfy a predetermined relationship.
- Si is a ferrite phase formation promoting element (so-called ferrite former element)
- Mn which is an alloy element is an austenite phase formation promoting element (so-called austenite former element). Therefore, depending on the respective contents of Si and Mn, the metal structure of the non-oriented electrical steel sheet changes, and the non-oriented electrical steel sheet becomes a component system having a transformation point or a component system having no transformation point. It becomes.
- the non-oriented electrical steel sheet according to the present embodiment it is required to appropriately increase the average crystal grain size in the base iron 11, and the component system having no transformation point increases the crystal grain size. It becomes an effective means for. Therefore, each content of Si and Mn needs to satisfy a predetermined relationship so that the component system does not have a transformation point.
- the ability to promote austenite phase formation by Mn (in other words, the effect of canceling the ability to promote ferrite phase formation) is considered to be about 0.5 times the ability to promote ferrite phase formation by Si. Therefore, the equivalent amount of the ferrite phase formation promoting ability in the present embodiment can be expressed as “Si ⁇ 0.5 ⁇ Mn” based on the Si content.
- the value of Si-0.5 ⁇ Mn When the value of Si-0.5 ⁇ Mn is less than 2.0%, the non-oriented electrical steel sheet becomes a component system having a transformation point. As a result, there is a concern that the metal structure of the steel sheet is not a ferrite single phase during high-temperature treatment during production, and the magnetic properties of the non-oriented electrical steel sheet are deteriorated. Therefore, the value of Si-0.5 ⁇ Mn needs to be 2.0% or more. Preferably, it is 2.1% or more.
- the upper limit of Si-0.5 ⁇ Mn is not particularly specified, but from the range of Si content and Mn content of the non-oriented electrical steel sheet according to the present embodiment, Si-0.5 ⁇ Mn. The value of Mn cannot exceed 3.5%. Therefore, the upper limit value of Si-0.5 ⁇ Mn is substantially 3.5%.
- spark discharge emission analysis method ICP emission analysis method
- combustion-infrared absorption method when measuring C and S with high accuracy
- inert gas melting-red when measuring O and N with high accuracy
- An external absorption method / thermal conductivity method or the like may be used as appropriate.
- the surface layer oxidized portion 11a in a state where oxygen is concentrated is formed on the surface layer portion of the ground iron 11 of the non-oriented electrical steel sheet 10 according to the present embodiment, as schematically shown in FIG.
- the base material part 11b, which is a part other than the surface layer oxidation part 11a, and the surface layer oxidation part 11a have different oxygen contents (O content).
- the center of the plate thickness excluding the surface layer portion that is a range from the front surface and the back surface of the steel plate (base iron 11) to the 10 ⁇ m position in the depth direction.
- the O content in the part is less than 0.0100%.
- the O content in the central portion of the plate thickness is preferably 0.0080% or less and may be 0%.
- the O content in the base iron 11 of 0.0110% to 0.0350% mentioned earlier means the average O content in the whole plate thickness direction of the base iron 11, and is in the central portion of the plate thickness. Different from O content. As described above, the O content in the central portion of the plate thickness excluding the steel plate (base iron 11) from the front and back surfaces to the 10 ⁇ m position in the depth direction is in the steel ingot that is the base of the base iron 11. It can be said that it is O content of.
- the O content in the central portion of the plate thickness is, for example, after melting up to 10 ⁇ m in the depth direction from the front and back surfaces of the steel plate (base iron 11) by a known method such as chemical polishing, for example, inert gas melting ⁇ It can be measured by using various known measuring methods such as infrared absorption method / thermal conductivity method.
- the depth from the front surface and the back surface of the steel sheet (base metal 11) is specified by specifying the O content in the central portion of the plate thickness and the average O content (average oxygen content) in the entire plate thickness direction. It is possible to calculate the O content up to 10 ⁇ m in the direction (in other words, the O content of the surface oxidation portion 11a). More specifically, the O content of the surface oxidation portion 11a can be calculated by the following formula (1) with reference to FIG.
- ⁇ O t (mass%): Average O content in the whole thickness direction of the steel sheet
- ⁇ O 10 ⁇ m (mass%): O content up to 10 ⁇ m position from the front surface and back surface of the steel sheet (ground iron) in the depth direction
- Amount ⁇ O b (mass%): O content in a portion where the steel plate (base iron) is removed from the front and back surfaces to the 10 ⁇ m position in the depth direction t ( ⁇ m): the thickness of the base iron
- the thickness (the thickness t in FIGS. 1 and 2) of the ground iron 11 in the non-oriented electrical steel sheet 10 according to the present embodiment is 0.40 mm or less. It is preferable that On the other hand, when the plate thickness t of the ground iron 11 is less than 0.10 mm, it is difficult to pass the annealing line because the plate thickness is thin. Therefore, the thickness t of the ground iron 11 in the non-oriented electrical steel sheet 10 is preferably 0.10 mm or more and 0.40 mm or less. The plate thickness t of the ground iron 11 in the non-oriented electrical steel sheet 10 is more preferably 0.15 mm or more and 0.35 mm or less.
- ground iron 11 of the non-oriented electrical steel sheet 10 according to the present embodiment has been described in detail.
- the iron loss is composed of eddy current loss and hysteresis loss.
- the insulating coating 13 provided in the non-oriented electrical steel sheet 10 according to the present embodiment is not particularly limited as long as it is used as an insulating film of the non-oriented electrical steel sheet, and a known insulating coating is used. It is possible to use.
- an insulating film for example, a composite insulating film mainly containing an inorganic substance and further containing an organic substance can be exemplified.
- the composite insulating film is mainly composed of at least one of inorganic substances such as metal chromate, metal phosphate or colloidal silica, Zr compound, Ti compound, and fine organic resin particles are dispersed. It is an insulating coating.
- metal phosphates, Zr or Ti coupling agents, or insulating films using these carbonates or ammonium salts as starting materials are available.
- metal phosphates, Zr or Ti coupling agents, or insulating films using these carbonates or ammonium salts as starting materials are available.
- metal phosphates, Zr or Ti coupling agents, or insulating films using these carbonates or ammonium salts as starting materials are available.
- insulating films using these carbonates or ammonium salts as starting materials are available.
- insulating films using these carbonates or ammonium salts as starting materials are available.
- the adhesion amount of the insulating coating 13 as described above is not particularly limited. For example, it is preferably about 0.1 g / m 2 or more and 2.0 g / m 2 or less per side, and 0.3 g per side. / M 2 or more and 1.5 g / m 2 or less is more preferable.
- the insulating coating 13 so as to have the above-described adhesion amount, it is possible to maintain excellent uniformity.
- various known measuring methods can be used.
- the adhesion amount of the insulating coating 13 is calculated from, for example, a mass difference between before and after removing the insulating coating 13 by removing only the insulating coating 13 by immersing the non-oriented electrical steel sheet 10 on which the insulating coating 13 is formed in a hot alkaline solution. Is possible.
- the non-oriented electrical steel sheet 10 according to the present embodiment has excellent magnetic properties by having the above structure.
- various magnetic properties shown by the non-oriented electrical steel sheet 10 according to the present embodiment are the Epstein method defined in JIS C2550 and the single plate magnetic property measurement method (Single Sheet Tester: SST) defined in JIS C2556. ) And can be measured.
- the non-oriented electrical steel sheet 10 according to the present embodiment has been described in detail above with reference to FIGS. 1 and 2.
- FIG. 3 is a flowchart showing an example of the flow of the method for manufacturing the non-oriented electrical steel sheet according to the present embodiment.
- ⁇ Hot rolling process> In the method for producing a non-oriented electrical steel sheet according to the present embodiment, first, by mass, C: more than 0%, 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0 % To 3.3%, P: more than 0%, less than 0.030%, S: more than 0%, 0.0050% or less, sol.
- Al more than 0%, 0.0040% or less, N: more than 0%, 0.0040% or less, O: less than 0.0100%, Sn: 0% to 0.050%, Sb: 0% to 0.050 , Ti: more than 0%, 0.0050% or less, the balance being Fe and impurities, Sn + Sb: 0.050% or less, Si-0.5 ⁇ Mn: 2.0% or more (Slab) is heated and hot rolling is performed on the heated steel ingot to obtain a hot-rolled steel sheet (step S101).
- the heating temperature of the steel ingot at the time of hot rolling is not particularly specified, but it is preferably, for example, 1050 ° C. to 1300 ° C.
- the heating temperature of the steel ingot is more preferably 1050 ° C. to 1250 ° C.
- the thickness of the hot-rolled steel sheet after hot rolling is not particularly specified, but is preferably about 1.6 mm to 3.5 mm in consideration of the final sheet thickness of the base iron. .
- the hot rolling step is preferably completed while the temperature of the steel sheet is in the range of 700 ° C to 1000 ° C.
- the end temperature of hot rolling is more preferably 750 ° C. to 950 ° C.
- hot-rolled sheet annealing (annealing for hot-rolled steel sheet) is performed (step S103).
- the hot-rolled steel sheet is annealed, for example, at 750 ° C. to 1200 ° C. and including soaking for 10 seconds to 10 minutes.
- the hot rolled steel sheet is annealed, for example, at 650 ° C. to 950 ° C. and including soaking for 30 minutes to 24 hours.
- step S105 pickling is performed (step S105). Thereby, the scale layer mainly composed of oxides formed on the surface of the steel sheet during the hot-rolled sheet annealing is removed.
- hot-rolled sheet annealing is box annealing, it is preferable to implement a pickling process before hot-rolled sheet annealing from a viewpoint of descaling property.
- Step S107 After the pickling step (when hot-rolled plate annealing is performed by box annealing, it may be after the hot-rolled plate annealing step), cold rolling is performed on the hot-rolled steel plate.
- Step S107 the pickled plate from which the scale has been removed is rolled at a rolling reduction such that the final thickness of the base iron is 0.10 mm or more and 0.40 mm or less.
- finish annealing is performed on the cold-rolled steel sheet obtained by the cold rolling step (step S109).
- the finish annealing conditions are controlled so that the average O content in the entire thickness direction of the cold-rolled steel sheet is 0.0110% by mass or more and 0.0350% by mass or less after the finish annealing. Therefore, the finish annealing process includes a temperature raising process, a soaking process, and a cooling process. In the finish annealing process of the method for manufacturing a non-oriented electrical steel sheet according to the present embodiment, it is necessary to control each process. is there.
- the average temperature raising rate is set to 1 ° C./second to 2000 ° C./second.
- the average temperature rising rate is more preferably 5 ° C./second to 1500 ° C./second, and the ratio of H 2 in the atmosphere is more preferably 15 volume% to 90 volume%.
- the dew point of the atmosphere is more preferably ⁇ 5 ° C. or more and 35 ° C.
- the temperature raising process of finish annealing is rapid heating. By rapidly performing the heating in the temperature raising process, a recrystallized texture that is advantageous in magnetic properties is formed in the iron core 11.
- finish annealing is preferably performed by continuous annealing. For example, in the case of heating by gas combustion, the above average heating rate is obtained by using direct heating or indirect heating using a radiant tube, or using a known heating method such as energization heating or induction heating. It is possible to realize.
- the soaking temperature is set to 700 ° C. to 1100 ° C.
- the soaking time is set to 1 second to 300 seconds
- the atmosphere has an H 2 ratio of 10% to 100% by volume.
- the soaking temperature is more preferably 750 ° C. to 1050 ° C., and the proportion of H 2 in the atmosphere is more preferably 15 volume% to 90 volume%.
- the dew point of the atmosphere is more preferably ⁇ 10 ° C. or higher and 30 ° C. or lower, and further preferably ⁇ 5 ° C. or higher and 20 ° C. or lower.
- the average cooling rate is preferably 1 ° C./second to 50 ° C./second to 200 ° C. or lower.
- the average cooling rate is more preferably 5 ° C./second to 30 ° C./second.
- the non-oriented electrical steel sheet 10 according to this embodiment can be manufactured.
- step S111 After the finish annealing, an insulating coating forming process is performed as necessary (step S111).
- the step of forming the insulating film is not particularly limited, and the treatment liquid may be applied and dried by a known method using the above-described known insulating film treatment liquid.
- the surface of the base iron 11 on which the insulating film is formed may be subjected to any pretreatment such as degreasing treatment with alkali or pickling treatment with hydrochloric acid, sulfuric acid, phosphoric acid or the like before applying the treatment liquid. And the surface as it is after finishing annealing without performing these pretreatments may be sufficient.
- the method for producing the non-oriented electrical steel sheet and the non-oriented electrical steel sheet according to the present invention will be specifically described with reference to examples.
- the example shown below is only an example of the manufacturing method of the non-oriented electrical steel sheet and the non-oriented electrical steel sheet according to the present invention, and the manufacturing method of the non-oriented electrical steel sheet and the non-oriented electrical steel sheet according to the present invention is as follows. It is not limited to the following example.
- Example 1 A steel slab containing the composition shown in Table 1 and the balance being Fe and impurities was heated to 1150 ° C. and then rolled to a thickness of 2.0 mm by hot rolling. Subsequently, the hot-rolled steel sheet was subjected to hot-rolled sheet annealing in a continuous annealing type annealing furnace with a soaking temperature of 1000 ° C. and a soaking time of 40 seconds, followed by cold rolling to obtain a 0.25 mm thick cold steel sheet. A rolled steel sheet was used. This cold-rolled steel sheet was subjected to finish annealing with a soaking temperature of 1000 ° C. and a soaking time of 15 seconds. Thereafter, a non-oriented electrical steel sheet was manufactured by further applying and baking a solution containing an acrylic resin emulsion mainly composed of a metal phosphate to both surfaces of the steel sheet to form a composite insulating film.
- the atmosphere of the temperature rising process and the soaking process was controlled to be 20 volume% H 2 +80 volume% N 2 atmosphere.
- the dew point is -30 ° C for test number 1, + 5 ° C for test number 2, + 15 ° C for test number 3, + 45 ° C for test number 4, + 15 ° C for test number 5, -15 ° C for test number 6
- Number 7 was + 45 ° C.
- the average temperature increase rate in the temperature rising process during the finish annealing was 20 ° C./second, and the average cooling rate in the cooling process was 20 ° C./second. After finish annealing, it was cooled to 200 ° C. or lower.
- Test No. 2, Test No. 3, and Test No. 6 in which the O content of the steel sheet after finish annealing is within the scope of the present invention were excellent in both iron loss and magnetic flux density.
- Example 2 A steel slab containing the composition shown in Table 2 and the balance being Fe and impurities was heated to 1160 ° C. and then rolled to 2.0 mm thickness by hot rolling. Subsequently, the hot-rolled steel sheet was subjected to hot-rolled sheet annealing in a continuous annealing-type annealing furnace under the conditions that the soaking temperature was 1000 ° C. and the soaking time was 40 seconds, and then cold-rolled to perform 0.25 mm thick cooling. A rolled steel sheet was obtained. Thereafter, the cold-rolled steel sheet was subjected to finish annealing under the conditions that the soaking temperature was 1000 ° C. and the soaking time was 15 seconds. Thereafter, a non-oriented electrical steel sheet was manufactured by further applying and baking a solution containing an acrylic resin emulsion mainly composed of a metal phosphate to both surfaces of the steel sheet to form a composite insulating film.
- the atmosphere of the temperature rising process and the soaking process was controlled to be 20 volume% H 2 +80 volume% N 2 atmosphere.
- the dew point was + 10 ° C.
- the average temperature increase rate in the temperature rising process during the finish annealing was 30 ° C./second, and the average cooling rate in the cooling process was 20 ° C./second. After finish annealing, it was cooled to 200 ° C. or lower.
- the test number 15 in which the Al content deviated higher than the range of the present invention and the test number 19 in which Ti deviated higher than the range of the present invention were inferior in iron loss and magnetic flux density.
- Test Nos. 9, 10, 13, 16, and 17 in which the chemical composition of the steel sheet is within the scope of the present invention were capable of cold rolling and were excellent in iron loss and magnetic flux density.
- Example 3 A steel slab containing the composition shown in Table 3 and the balance being Fe and impurities was heated to 1150 ° C. and then rolled to 2.0 mm thickness by hot rolling. Subsequently, the hot-rolled steel sheet was subjected to hot-rolled sheet annealing in a continuous annealing-type annealing furnace under the conditions that the soaking temperature was 1000 ° C. and the soaking time was 40 seconds, and then cold-rolled to perform 0.25 mm thick cooling. A rolled steel sheet was obtained. Thereafter, the cold-rolled steel sheet was subjected to finish annealing under conditions where the soaking temperature was 800 ° C. and the soaking time was 15 seconds.
- a non-oriented electrical steel sheet was manufactured by further applying and baking a solution containing an acrylic resin emulsion mainly composed of a metal phosphate to both surfaces of the steel sheet to form a composite insulating film. Subsequently, the obtained steel plate was subjected to strain relief annealing at 750 ° C. ⁇ 2 hr.
- the atmosphere of the temperature raising process and the soaking process was controlled to be 15 volume% H 2 +85 volume% N 2 atmosphere.
- the dew point was + 10 ° C.
- the average temperature increase rate in the temperature increase process during finish annealing was 20 ° C./second, and the average cooling rate in the cooling process was 15 ° C./second. After finish annealing, it was cooled to 200 ° C. or lower.
- test numbers 20, 22 and 24, in which the chemical composition of the steel sheet is within the scope of the present invention were excellent in iron loss and magnetic flux density.
- Test No. 21 in which Si-0.5 ⁇ Mn was out of the range of the present invention was inferior in iron loss and magnetic flux density.
- the non-oriented steel sheet according to the present invention exhibits excellent magnetic properties even when strain relief annealing is performed.
Abstract
Description
本願は、2017年01月16日に、日本に出願された特願2017-005213号に基づき優先権を主張し、その内容をここに援用する。
また、更なる冷間圧延性の向上のためには、冷間圧延性の低下を招く可能性のあるP、Sn、Sbの含有量を低減することが求められる。一方で、本発明者らは、Sn及びSbの含有量を低減すると、仕上焼鈍時の窒化が促進され、磁気特性が低下する可能性があるとの知見も得た。このような知見をもとに、本発明者が更なる検討を行った結果、Sn及びSbの含有量を低減した場合であっても、磁気特性の低下を招くことなく、冷間圧延性をより一層向上させることが可能な方法に想到し、本発明を完成するに至った。
上記知見に基づき完成された本発明の要旨は、以下の通りである。
無方向性電磁鋼板においては、先だって説明したように、鉄損を低減するために、一般的には、鋼中に合金元素を含有させて鋼板の電気抵抗を上げて、渦電流損を低減させる。ここで、同一の含有量(質量%)の合金元素を含有させることを考えた場合に、Siが、電気抵抗を上昇させやすいので、鉄損の低減に有効な元素である。しかしながら、本発明者らによる検討の結果、Si含有量が4.0質量%を超える場合には、無方向性電磁鋼板の冷間圧延性が著しく低下することが明らかとなった。
また、更なる冷間圧延性の向上のためには、冷間圧延性の低下を招く可能性のあるP、Sn、Sbの含有量を低減することが求められる。しかしながら、本発明者らは、Sn及びSbの含有量の低減は、仕上焼鈍時の窒化を促進して、磁気特性を低下させる可能性があるとの知見も得た。本発明者らが更なる検討を行った結果、仕上焼鈍時に鋼板の表層部分を適度に酸化させて窒化を抑制することにより、冷間圧延性をより一層向上させるためにSn及びSbの含有量を低減した場合であっても、磁気特性の低下を抑制できるとの知見を得た。
図1は、本発明の実施形態に係る無方向性電磁鋼板の構造を模式的に示した図であり、図2は、本発明の実施形態に係る無方向性電磁鋼板の地鉄の構造を模式的に示した図である。
本実施形態に係る無方向性電磁鋼板10の地鉄11は、化学組成が、質量%で、C:0%超、0.0050%以下、Si:3.0%~4.0%、Mn:1.0%~3.3%、P:0%超、0.030%未満、S:0%超、0.0050%以下、sol.Al:0%超、0.0040%以下、N:0%超、0.0040%以下、O:0.0110%~0.0350%、Sn:0%~0.050%、Sb:0%~0.050%、Ti:0%超、0.0050%以下、を含有し、残部がFe及び不純物からなり、Sn+Sb:0.050%以下、Si-0.5×Mn≧2.0%を満足する。
C(炭素)は、不可避的に含有される元素であるとともに、鉄損劣化(鉄損の増加)を引き起こす元素である。C含有量が0.0050%を超える場合には、無方向性電磁鋼板において鉄損劣化が生じ、良好な磁気特性を得ることができない。従って、本実施形態に係る無方向性電磁鋼板では、C含有量を、0.0050%以下とする。C含有量は、好ましくは0.0040%以下であり、より好ましくは0.0030%以下である。C含有量は、少なければ少ないほど好ましいが、Cは不可避的に含有される元素であり、下限を0%超とする。また、C含有量を0.0005%よりも低減させようとすると、大幅なコストアップとなる。従って、C含有量は、0.0005%以上としてもよい。
Si(ケイ素)は、鋼の電気抵抗を上昇させることによって、渦電流損を低減させ、高周波鉄損を改善する元素である。また、Siは、固溶強化能が大きいため、無方向性電磁鋼板の高強度化にも有効な元素である。無方向性電磁鋼板において、高強度化は、モータの高速回転時の変形抑制や疲労破壊抑制といった観点から必要である。このような効果を十分に発揮させるためには、Si含有量を3.0%以上とすることが必要である。Si含有量は、好ましくは3.1%以上、より好ましくは3.2%以上である。
一方、Si含有量が4.0%を超える場合には、加工性が著しく劣化し、冷間圧延を実施することが困難となったり、冷間圧延の途中で鋼板が破断したりする(すなわち、冷間圧延性が低下する)。従って、Si含有量は、4.0%以下とする。Si含有量は、好ましくは3.9%以下であり、より好ましくは、3.8%以下である。
Mn(マンガン)は、電気抵抗を上昇させることによって、渦電流損を低減し、高周波鉄損を改善する元素である。また、Mnは、Siより固溶強化能は小さいものの、加工性を劣化させることなく、無方向性電磁鋼板の高強度化に寄与できる元素である。このような効果を十分に発揮させるためには、Mn含有量を1.0%以上とすることが必要である。Mn含有量は、好ましくは1.2%以上、より好ましくは1.4%以上である。
一方、Mn含有量が3.3%を超える場合には、磁束密度の低下が顕著となる。従って、Mn含有量は、3.3%以下とする。Mn含有量は、好ましくは3.0%以下であり、より好ましくは、2.8%以下である。
P(リン)は、Si及びMnの含有量が多い高合金鋼において、著しく加工性を劣化させて冷間圧延を困難にする元素である。従って、P含有量は、0.030%未満とする。P含有量は、好ましくは0.020%以下であり、より好ましくは、0.010%以下である。
P含有量は、少なければ少ないほど良いが、Pは不可避的に含有される元素であり、下限を0%超とする。P含有量を0.001%未満にしようとすると、大幅なコストアップを招く。従って、下限を0.001%以上とすることが好ましい。より好ましくは0.002%以上である。
S(硫黄)は、MnSの微細析出物を形成することで鉄損を増加させ、無方向性電磁鋼板の磁気特性を劣化させる元素である。そのため、S含有量は、0.0050%以下とする必要がある。S含有量は、好ましくは0.0040%以下であり、より好ましくは0.0035%以下である。
S含有量は、少なければ少ないほど好ましいが、Sは不可避的に含有される元素であり、下限を0%超とする。また、S含有量を0.0001%よりも低減させようとすると、大幅なコストアップを招く。従って、S含有量は、好ましくは0.0001%以上である。
Al(アルミニウム)は、鋼中に固溶されると、無方向性電磁鋼板の電気抵抗を上昇させることによって渦電流損を低減し、高周波鉄損を改善する元素である。しかしながら、本実施形態に係る無方向性電磁鋼板では、Alよりも加工性を劣化させずに電気抵抗を上昇させる元素であるMnを積極的に含有させる。そのため、Alを積極的に含有させる必要はない。また、sol.Al(酸可溶性Al)含有量が0.0040%を超えると、鋼中に微細な窒化物が析出して熱延板焼鈍や仕上焼鈍での結晶粒成長が阻害され、磁気特性が劣化する。従って、sol.Al含有量は、0.0040%以下とする。sol.Al含有量は、好ましくは0.0030%以下、より好ましくは0.0020%以下である。
一方、Alは不可避的に含有される元素であり、下限を0%超とする。また、sol.Al含有量を0.0001%よりも低減させようとすると、大幅なコストアップを招く。従って、sol.Al含有量は、好ましくは0.0001%以上である。
N(窒素)は、鋼中で微細な窒化物を形成して鉄損を増加させ、無方向性電磁鋼板の磁気特性を劣化させる元素である。そのため、N含有量は、0.0040%以下とする必要がある。N含有量は、好ましくは0.0030%以下であり、より好ましくは0.0020%以下である。
一方、Nは不可避的に含有される元素であり、下限を0%超とする。また、N含有量は、少なければ少ないほど良いが、N含有量を0.0001%よりも低減させようとすると、大幅なコストアップを招く。従って、N含有量は、好ましくは0.0001%以上である。より好ましくは、0.0003%以上である。
後述する範囲にSn含有量及びSb含有量を低減すると、仕上焼鈍時の鋼板表面の窒化が促進される。O(酸素)は、仕上焼鈍時の窒化を防止するために、仕上焼鈍時に鋼中に導入される元素である。仕上焼鈍時の窒化を防止するためには、O含有量が0.0110%以上となるように酸素を鋼中に導入する必要がある。O含有量は、好ましくは0.0115%以上であり、より好ましくは0.0120%以上である。
一方、O含有量が0.0350%を超える場合には、酸素の導入により形成される鋼板表層部分の酸化層が厚くなり、磁気特性が劣化するので好ましくない。従って、O含有量は、0.0350%以下とする。O含有量は、好ましくは0.0330%以下であり、より好ましくは0.0300%以下である。
[Sb:0%~0.050%]
Sn、Sbは必ずしも含有する必要はないので、下限は0%である。
Sn(スズ)及びSb(アンチモン)は、鋼板の表面に偏析して焼鈍中の窒化を抑制することで、低い鉄損を確保するのに有用な元素である。従って、本実施形態に係る無方向性電磁鋼板では、このような効果を得るために、Sn及びSbの少なくとも何れか一方を地鉄11中に含有させることが好ましい。
具体的には、Sn含有量は、好ましくは0.005%以上であり、より好ましくは0.010%以上である。また、Sb含有量は、好ましくは0.005%以上であり、より好ましくは、0.010%以上である。
一方、Sn及びSbの含有量がそれぞれ0.050%を超える場合には、地鉄の延性が低下して冷間圧延が困難となる。従って、含有させる場合でも、Sn及びSbの含有量は、それぞれ0.050%以下とすることが好ましい。Sn含有量は、より好ましくは0.040%以下であり、更に好ましくは0.030%以下である。また、Sb含有量は、より好ましくは0.040%以下であり、更に好ましくは0.030%以下である。
Sn及びSbは、前述のように、地鉄11中に多く含有させすぎると冷間圧延性の低下の原因となる元素である。特に、Sn及びSbの合計含有量が0.050%を超えると、冷間圧延性の低下が顕著となる。従って、Sn及びSbの合計含有量は、0.050%以下とする。Sn及びSbの合計含有量は、好ましくは0.040%以下であり、より好ましくは0.030%以下である。
Ti(チタン)は、SiやMnの原材料中に不可避的に含有される。Tiは、地鉄中のC、N、Oなどと結合してTiN、TiC、Ti酸化物などの微小析出物を形成し、焼鈍中の結晶粒の成長を阻害して磁気特性を劣化させる元素である。従って、Ti含有量は0.0050%以下とする。好ましくは0.0040%以下、より好ましくは0.0030%以下である。
一方、Tiは不可避的に含有される元素であり、下限は0%超とする。Ti含有量を0.0003%未満にしようとすると大幅なコストアップになるので、Ti含有量を0.0003%以上とすることが好ましい。より好ましくは。0.0005%以上である。
本実施形態に係る方向性電磁鋼板では、上記のように各元素の含有量を制御した上で、Si含有量とMn含有量とが所定の関係性を満足するように制御する。
Siは、フェライト相形成促進元素(いわゆる、フェライトフォーマー元素)である一方で、合金元素であるMnは、オーステナイト相形成促進元素(いわゆる、オーステナイトフォーマー元素)である。従って、Si及びMnそれぞれの含有量に応じて、無方向性電磁鋼板の金属組織は変化し、無方向性電磁鋼板は、変態点を有する成分系となったり、変態点を有しない成分系となったりする。本実施形態に係る無方向性電磁鋼板では、地鉄11における平均結晶粒径を適度に大きくすることが求められており、変態点を有しない成分系とすることは、結晶粒径を大きくするための有効な手段となる。そのため、変態点を有しない成分系となるように、Si及びMnのそれぞれの含有量は、所定の関係性を満たす必要がある。
一方、Si-0.5×Mnの上限値は、特に規定するものではないが、本実施形態に係る無方向性電磁鋼板のSi含有量及びMn含有量の範囲から、Si-0.5×Mnの値は、3.5%を超えることはあり得ない。従って、Si-0.5×Mnの上限値は、実質的には、3.5%となる。
続いて、図2を参照しながら、本実施形態に係る無方向性電磁鋼板10の地鉄11における酸素の分布状況について、詳細に説明する。
先だって簡単に言及したように、本実施形態に係る無方向性電磁鋼板10が製造される際には、仕上焼鈍時に、鋼板の表層部分を適度に酸化させる処理が行われる。仕上焼鈍時の酸化処理は、焼鈍雰囲気の露点を制御することで行われるので、酸素原子は、地鉄11の表面から地鉄11の内部に向かって浸透していく。その結果、本実施形態に係る無方向性電磁鋼板10の地鉄11の表層部分には、図2に模式的に示したように、酸素が濃化した状態にある表層酸化部11aが形成され、表層酸化部11a以外の部位である母材部11bと、表層酸化部11aとは、酸素の含有量(O含有量)が異なることとなる。
上記のような、鋼板(地鉄11)の表面及び裏面から深さ方向に向かって10μm位置までを除いた板厚中央部分のO含有量は、地鉄11のもととなる鋼塊中でのO含有量であるともいえる。
・Ot(質量%):鋼板の板厚方向全体での平均O含有量
・O10μm(質量%):鋼板(地鉄)の表面及び裏面から深さ方向に向かって10μm位置までのO含有量
・Ob(質量%):鋼板(地鉄)の表面及び裏面から深さ方向に向かって10μm位置までを除去した部分のO含有量
・t(μm):地鉄の厚み
本実施形態に係る無方向性電磁鋼板10における地鉄11の板厚(図1及び図2における厚みt)は、渦電流損を低減させて高周波鉄損を低減するために、0.40mm以下とすることが好ましい。一方、地鉄11の板厚tが0.10mm未満である場合には、板厚が薄いために焼鈍ラインの通板が困難となる可能性がある。従って、無方向性電磁鋼板10における地鉄11の板厚tは、0.10mm以上、0.40mm以下とすることが好ましい。無方向性電磁鋼板10における地鉄11の板厚tは、より好ましくは、0.15mm以上、0.35mm以下である。
続いて、本実施形態に係る無方向性電磁鋼板10が有していることが好ましい絶縁被膜13について、簡単に説明する。
本実施形態に係る無方向性電磁鋼板10は、上記のような構造を有することで、優れた磁気特性を示す。ここで、本実施形態に係る無方向性電磁鋼板10の示す各種の磁気特性は、JIS C2550に規定されたエプスタイン法や、JIS C2556に規定された単板磁気特性測定法(Single Sheet Tester:SST)に則して、測定することが可能である。
続いて、図3を参照しながら、以上説明したような本実施形態に係る無方向性電磁鋼板10の製造方法について、簡単に説明する。
図3は、本実施形態に係る無方向性電磁鋼板の製造方法の流れの一例を示した流れ図である。
本実施形態に係る無方向性電磁鋼板の製造方法では、まず、質量%で、C:0%超、0.0050%以下、Si:3.0%~4.0%、Mn:1.0%~3.3%、P:0%超、0.030%未満、S:0%超、0.0050%以下、sol.Al:0%超、0.0040%以下、N:0%超、0.0040%以下、O:0.0100%未満、Sn:0%~0.050%、Sb:0%~0.050%、Ti:0%超、0.0050%以下を含有し、残部がFe及び不純物からなり、Sn+Sb:0.050%以下、Si-0.5×Mn:2.0%以上である鋼塊(スラブ)を加熱し、加熱された鋼塊について熱間圧延を行って、熱延鋼板を得る(ステップS101)。熱間圧延に供する際の鋼塊の加熱温度については、特に規定するものではないが、例えば、1050℃~1300℃とすることが好ましい。鋼塊の加熱温度は、より好ましくは、1050℃~1250℃である。
上記熱間圧延の後には、熱延板焼鈍(熱延鋼板に対する焼鈍)が実施される(ステップS103)。連続焼鈍の場合には、熱延鋼板に対して、例えば、750℃~1200℃で、10秒~10分の均熱を含む焼鈍を実施する。また、箱焼鈍の場合、熱延鋼板に対して、例えば、650℃~950℃で、30分~24時間の均熱を含む焼鈍を実施する。
上記熱延板焼鈍工程の後には、酸洗が実施される(ステップS105)。これにより、熱延板焼鈍の際に鋼板の表面に形成された、酸化物を主体とするスケール層が除去される。熱延板焼鈍が箱焼鈍である場合、脱スケール性の観点から、酸洗工程は、熱延板焼鈍前に実施することが好ましい。
上記酸洗工程の後(熱延板焼鈍が箱焼鈍で実施される場合は、熱延板焼鈍工程の後となる場合もある。)には、熱延鋼板に対し、冷間圧延が実施される(ステップS107)。冷間圧延では、地鉄の最終板厚が0.10mm以上0.40mm以下となるような圧下率で、スケールの除去された酸洗板が圧延される。
上記冷間圧延工程の後には、冷間圧延工程によって得られた冷延鋼板に対し、仕上焼鈍が実施される(ステップS109)。この仕上焼鈍工程では、仕上焼鈍後に冷延鋼板の板厚方向全体における平均O含有量が0.0110質量%以上0.0350質量%以下となるように、仕上焼鈍条件が制御される。そのため、仕上焼鈍工程は、昇温過程、均熱過程、冷却過程を含むが、本実施係形態に係る無方向性電磁鋼板の製造方法の仕上焼鈍工程では、それぞれの過程について、制御する必要がある。
本実施形態に係る無方向性電磁鋼板の製造方法では、仕上焼鈍の昇温過程を、急速加熱とする。昇温過程の加熱を急速に行うことにより、地鉄11において、磁気特性に有利な再結晶集合組織が形成される。仕上焼鈍の昇温過程を急速加熱とする場合、本実施形態に係る無方向性電磁鋼板の製造方法では、仕上焼鈍は、連続焼鈍で実施することが好ましい。上記の平均加熱速度は、例えば、ガス燃焼による加熱の場合には直接加熱やラジアントチューブを用いた間接加熱を用いたり、その他に通電加熱又は誘導加熱等といった公知の加熱方法を用いたりすることで、実現することが可能である。
上記仕上焼鈍の後には、必要に応じて、絶縁被膜の形成工程が実施される(ステップS111)。ここで、絶縁被膜の形成工程については、特に限定されるものではなく、上記のような公知の絶縁被膜処理液を用いて、公知の方法により処理液の塗布及び乾燥を行えばよい。
表1に示す組成を含有し、残部がFe及び不純物からなる鋼スラブを、1150℃に加熱した後、熱間圧延にて2.0mm厚に圧延した。続いて、熱延鋼板を連続焼鈍式の焼鈍炉で、均熱温度が1000℃で均熱時間が40秒の熱延板焼鈍を行った後、冷間圧延を行って0.25mm厚の冷延鋼板とした。この冷延鋼板に対し、均熱温度が1000℃で均熱時間が15秒の仕上焼鈍を行った。その後、更にリン酸金属塩を主体とし、アクリル樹脂のエマルジョンを含む溶液を鋼板の両面に塗布及び焼き付けし、複合絶縁被膜を形成することで無方向性電磁鋼板を製造した。
表2に示す組成を含有し、残部がFe及び不純物からなる鋼スラブを、1160℃に加熱した後、熱間圧延にて2.0mm厚に圧延した。続いて、熱延鋼板を均熱温度が1000℃、均熱時間が40秒となる条件で連続焼鈍式の焼鈍炉で熱延板焼鈍した後、冷間圧延を行って0.25mm厚の冷延鋼板を得た。その後、この冷延鋼板に対し、均熱温度が1000℃、均熱時間が15秒となる条件で仕上焼鈍を行った。その後、更にリン酸金属塩を主体とし、アクリル樹脂のエマルジョンを含む溶液を鋼板の両面に塗布及び焼き付けし、複合絶縁被膜を形成することで無方向性電磁鋼板を製造した。
表3に示す組成を含有し、残部がFe及び不純物からなる鋼スラブを、1150℃に加熱した後、熱間圧延にて2.0mm厚に圧延した。続いて、熱延鋼板を均熱温度が1000℃、均熱時間が40秒となる条件で連続焼鈍式の焼鈍炉で熱延板焼鈍した後、冷間圧延を行って0.25mm厚の冷延鋼板を得た。その後、この冷延鋼板に、均熱温度が800℃、均熱時間が15秒となる条件で仕上焼鈍を行った。その後、更にリン酸金属塩を主体とし、アクリル樹脂のエマルジョンを含む溶液を鋼板の両面に塗布及び焼き付けし、複合絶縁被膜を形成することで無方向性電磁鋼板を製造した。続いて、得られた鋼板に対し、750℃×2hrの歪取焼鈍を施した。
11 地鉄
11a 表層酸化部
11b 母材部
13 絶縁被膜
Claims (3)
- 化学組成が、質量%で、
C:0%超、0.0050%以下、
Si:3.0%~4.0%、
Mn:1.0%~3.3%、
P:0%超、0.030%未満、
S:0%超、0.0050%以下、
sol.Al:0%超、0.0040%以下、
N:0%超、0.0040%以下、
O:0.0110%~0.0350%、
Sn:0%~0.050%、
Sb:0%~0.050%、
Ti:0%超、0.0050%以下、
を含有し、残部がFe及び不純物からなり、
Sn+Sb:0.050%以下、
Si-0.5×Mn:2.0%以上であり、
表面及び裏面から深さ方向に10μmの位置までの範囲である表層部分を除いた板厚中央部分のO含有量が、0.0100%未満である
ことを特徴とする無方向性電磁鋼板。 - 化学組成が、質量%で、C:0%超、0.0050%以下、Si:3.0%~4.0%、Mn:1.0%~3.3%、P:0%超、0.030%未満、S:0%超、0.0050%以下、sol.Al:0%超、0.0040%以下、N:0%超、0.0040%以下、O:0.0100%未満、Sn:0%~0.050%、Sb:0%~0.050%、Ti:0%超、0.0050%以下を含有し、残部がFe及び不純物からなり、Sn+Sb:0.050%以下、Si-0.5×Mn:2.0%以上である鋼塊を、熱間圧延して熱延鋼板とする熱間圧延工程と、
前記熱延鋼板を焼鈍する熱延板焼鈍工程と、
前記熱延板焼鈍工程後の前記熱延鋼板を冷間圧延して冷延鋼板とする冷間圧延工程と、
前記冷延鋼板に対して仕上焼鈍を施す仕上焼鈍工程と、
を含み、
前記仕上焼鈍工程では、仕上焼鈍後に前記冷延鋼板の板厚方向全体における平均O含有量が0.0110質量%以上0.0350質量%以下となるように、仕上焼鈍条件が制御される、
ことを特徴とする無方向性電磁鋼板の製造方法。 - 前記仕上焼鈍工程では、昇温時及び均熱時の雰囲気の露点が-10℃~40℃の範囲内となるように制御される
ことを特徴とする請求項2に記載の無方向性電磁鋼板の製造方法。
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Also Published As
Publication number | Publication date |
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EP3569726A4 (en) | 2020-06-03 |
BR112019009507A2 (pt) | 2019-07-30 |
JPWO2018131710A1 (ja) | 2019-11-07 |
PL3569726T3 (pl) | 2022-08-01 |
EP3569726B1 (en) | 2022-05-11 |
BR112019009507B1 (pt) | 2023-04-11 |
EP3569726A1 (en) | 2019-11-20 |
US20190316221A1 (en) | 2019-10-17 |
US11021771B2 (en) | 2021-06-01 |
JP6593555B2 (ja) | 2019-10-23 |
CN110121567B (zh) | 2021-07-27 |
TWI641703B (zh) | 2018-11-21 |
TW201829802A (zh) | 2018-08-16 |
CN110121567A (zh) | 2019-08-13 |
KR102259136B1 (ko) | 2021-06-01 |
KR20190092499A (ko) | 2019-08-07 |
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