WO2013179438A1 - 無方向性電磁鋼板 - Google Patents
無方向性電磁鋼板 Download PDFInfo
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- WO2013179438A1 WO2013179438A1 PCT/JP2012/064062 JP2012064062W WO2013179438A1 WO 2013179438 A1 WO2013179438 A1 WO 2013179438A1 JP 2012064062 W JP2012064062 W JP 2012064062W WO 2013179438 A1 WO2013179438 A1 WO 2013179438A1
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- WIPO (PCT)
- Prior art keywords
- mass
- steel sheet
- less
- iron loss
- thickness
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title abstract description 30
- 239000010959 steel Substances 0.000 title abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 claims description 25
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 44
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract 1
- 229940035427 chromium oxide Drugs 0.000 abstract 1
- 229910000423 chromium oxide Inorganic materials 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 87
- 238000000137 annealing Methods 0.000 description 14
- 239000010410 layer Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 230000004907 flux Effects 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000005097 cold rolling Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
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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
- H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
-
- 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
-
- 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
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a non-oriented electrical steel sheet that is suitable as a material for motor cores, particularly motor cores that are driven at high speed and high frequency, such as electric cars and hybrid cars.
- the thickness of the product is selected from the balance between required iron loss characteristics and cost.
- Si, Al, and Mn are generally used to increase the specific resistance by high alloying.
- Si and Al are added, there is a problem that the hardness of the steel sheet increases, the steel sheet becomes brittle, and the productivity deteriorates, so there is an upper limit to the amount of addition.
- Mn is added, the increase in the hardness of the steel sheet is small, but the effect of increasing the specific resistance is about half that of Si and Al.
- there is an upper limit in the amount of addition because it may cause a red hot brittleness problem in the hot rolling process.
- Patent Document 1 discloses a technique for increasing the specific resistance by adding 1.5% to 20% of Cr.
- the effect of increasing the specific resistance when Cr is added is similar to that of Mn.
- the addition is 20% or less, the hardness of the steel sheet does not increase so much, and the concern about embrittlement is low.
- unlike Mn there are few problems of red heat embrittlement.
- the drive motors of electric vehicles and hybrid vehicles are used not only at high speeds, but also at low speeds and high torques during startup and climbing, and the high-frequency driving areas where high efficiency is required are at intermediate speeds between them. It is possible that there is. Therefore, the electromagnetic steel sheet for motor cores is required not only to reduce iron loss at high frequencies but also to reduce iron loss at low frequencies.
- the present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a non-oriented electrical steel sheet having excellent iron loss over a wide range of frequencies.
- the inventors have achieved a desired object by satisfying a certain formula in which the ratio of mass% of Si, Al and Cr satisfies the plate thickness of the product.
- the knowledge that it is achieved was obtained. That is, the gist of the present invention is as follows.
- Si is an effective element for reducing high-frequency iron loss by increasing the specific resistance of the steel sheet and reducing eddy current loss, and the Si content is 2 mass% or more and less than 4.5 mass%. If it is less than 2% by mass, the specific resistance cannot be increased sufficiently, and the effect of reducing the iron loss cannot be obtained sufficiently.
- Si decreases the saturation magnetic flux density of the steel sheet, when it exceeds 4.5 mass%, the saturation magnetic flux density is remarkably decreased, and B50 (excitation magnetizing force), which is one of the material characteristic indicators of the non-oriented electrical steel sheet. The decrease in magnetic flux density at 5000 A / m becomes significant.
- Al is an element effective for increasing the specific resistance of the steel sheet and reducing the high-frequency iron loss similarly to Si, and the Al content is 0.3 mass% or more and less than 2.5 mass%. If it is less than 0.3% by mass, the specific resistance cannot be increased sufficiently, and the effect of reducing the iron loss cannot be sufficiently obtained. On the other hand, since Al decreases the saturation magnetic flux density of the steel sheet, when it exceeds 2.5% by mass, the saturation magnetic flux density is significantly decreased, and the decrease in B50 becomes remarkable.
- Cr is an element effective for increasing the specific resistance of the steel sheet and reducing the high-frequency iron loss although the effect margin is smaller than that of Si and Al, and the Cr content is 0.3 mass% or more and less than 5 mass%. . If it is less than 0.3% by mass, the specific resistance cannot be increased sufficiently, and the effect of reducing the iron loss cannot be obtained sufficiently. On the other hand, since Cr lowers the saturation magnetic flux density of the steel sheet, if it exceeds 5% by mass, the saturation magnetic flux density is remarkably lowered, and the reduction of B50 becomes remarkable.
- Ratio of mass% of Si, Al, and Cr (2 [Al] + [Cr]) / 2 [Si] satisfies a certain formula described below with respect to the thickness of the product and the target frequency.
- the hysteresis loss does not deteriorate so much even if the Si content is increased, but the hysteresis loss rapidly deteriorates if the contents of Al and Cr are increased.
- the specific resistance and thickness are equivalent, that is, the equivalent eddy current loss, the iron loss deteriorates when the ratio of (2 [Al] + [Cr]) / 2 [Si] increases. It was found that the hysteresis loss deteriorates.
- C, S, and N are impurity elements for the non-oriented electrical steel sheet of the present invention, and the smaller the number, the better.
- the C is an element that precipitates as carbides in the steel sheet and degrades crystal grain growth and iron loss. Therefore, the C content is 0.005% by mass or less. When it exceeds 0.005 mass%, the crystal grain growth property deteriorates and the iron loss deteriorates. Furthermore, in order to suppress magnetic aging, it is preferable to set it as 0.003 mass% or less. Although a minimum is not specifically limited, It is difficult to make it 0.001 mass% or less with a normal manufacturing method.
- S is an element that precipitates as a sulfide in the steel sheet and degrades the crystal grain growth and iron loss. Therefore, the S content is 0.003% by mass or less. When it exceeds 0.003 mass%, the crystal grain growth property deteriorates and the iron loss deteriorates. Although a minimum is not specifically limited, It is difficult to make it 0.0005 mass% or less with a normal manufacturing method.
- N content shall be 0.003 mass% or less. When it exceeds 0.003 mass%, a blister-like surface defect called a blister occurs. Although a minimum is not specifically limited, It is difficult to make it 0.001 mass% or less with a normal manufacturing method.
- Mn is contained, the Mn content is preferably 1.5% by mass or less. Although Mn also has a small effect margin, it increases the specific resistance of the steel sheet, but if it exceeds 1.5 mass%, it may become brittle. Although a minimum is not specifically limited, It is more preferable that it is 0.2 mass% or more from a viewpoint of suppressing the fine precipitation of sulfide.
- At least one of Sn, Cu, Ni, and Sb may be contained in an amount of 0.20% by mass or less.
- a slab is produced by casting molten steel composed of the same components as those described above, and the produced slab is reheated and hot-rolled to obtain a hot-rolled sheet.
- a thin slab may be produced by a rapid solidification method, or a thin steel plate may be directly cast to obtain a hot rolled plate.
- the obtained hot-rolled sheet is subjected to a normal pickling treatment, and then cold-rolled to obtain a cold-rolled sheet.
- the hot rolled sheet annealing may be continuous annealing or batch annealing, and is performed at a temperature and a time at which a crystal grain size suitable for improving magnetic properties is obtained.
- Cold rolling is usually performed by levers or tandem, but levers mills such as Sendzimer mill are preferred because they can provide a higher magnetic flux density. Moreover, since steel plate will embrittle if there is too much Si and Al, it is good also as warm rolling from a brittle fracture countermeasure. And it is rolled to the plate
- finish annealing is performed.
- a sufficient temperature for recrystallization and grain growth is necessary, and it is usually performed at 800 ° C. to 1100 ° C.
- finish annealing a Cr oxide layer is formed on the surface of the steel plate.
- the Cr oxide is thin and has a very dense structure, and when formed on the surface of the steel sheet, it is considered to prevent the subsequent entry of oxygen and suppress the internal oxidation of Si and Al. Since Si and Al in the steel plate are easily oxidized, if oxygen diffuses into the steel plate at high temperature and internal oxidation occurs, the domain wall movement is hindered and the hysteresis loss is deteriorated. Furthermore, when internal oxidation occurs, the presence of a non-magnetic oxide layer decreases the effective cross-sectional area through which magnetic flux can pass, thereby increasing the magnetic flux density and degrading eddy current loss. Moreover, since the magnetic flux concentrates in the vicinity of the steel sheet surface layer due to the skin effect at high frequencies, the above-described influence becomes more remarkable.
- the thickness of the Cr oxide layer formed on the surface of the steel sheet is set to be 0.01 ⁇ m or more and 0.5 ⁇ m or less.
- the thickness of the Cr oxide layer is less than 0.01 ⁇ m, the effect of preventing the intrusion of oxygen and suppressing the internal oxidation of Si and Al is insufficient.
- the thickness of the Cr oxide layer exceeds 0.5 ⁇ m, adverse effects on the magnetic characteristics begin to appear.
- the entire annealing is set to a low oxygen potential and also to a low oxygen potential even when the temperature is raised. For example, 300 ° C. to 500 ° C. at the time of temperature rise is set to P H2O / PH2 ⁇ 10 ⁇ 3 .
- the coating is not particularly limited as long as it is insulative, and all organic, all inorganic, and a mixture of organic and inorganic materials do not hinder the effects of the present invention.
- Example 1 First, it contains C: 0.002 mass%, S: 0.002 mass%, N: 0.002 mass%, and Mn: 0.3 mass%.
- Si, Al, and Cr the following Table 1 A hot-rolled sheet having the composition shown in FIG. 5 was prepared and pickled, and a cold-rolled sheet having a thickness of 0.25 mm was obtained by cold rolling. Next, the oxygen potential was controlled under the conditions shown in Table 1, and finish annealing was performed at 1000 ° C. to obtain a non-oriented electrical steel sheet.
- sample No. No. 1 was excellent in iron loss at both frequencies of 3000 Hz and 800 Hz.
- sample No. which is a comparative example. 2 is Sample No. 1 but the oxygen potential at the time of finish annealing was high, the thickness of the Cr oxide layer was 0.8 ⁇ m, and both the iron loss W10 / 3000 and the iron loss W10 / 800 were the same as Sample No. 1. It became larger than 1.
- Sample No. In No. 3 since the Cr content was small, the Cr oxide layer could not be detected, and the thickness was estimated to be less than 0.01 ⁇ m. As a result, it is presumed that an internal oxide layer of Si and Al was generated, and both the iron loss W10 / 3000 and the iron loss W10 / 800 were sample Nos. It became larger than 1.
- Example 2 First, C: 0.002% by mass, S: 0.002% by mass, N: 0.002% by mass, and Mn: 0.3% by mass.
- Si, Al, and Cr the following Table 3
- the hot rolled sheets of components A to L as shown in FIG. 6 were prepared and pickled, and cold rolled sheets having a thickness of 0.15 mm to 0.30 mm were obtained by cold rolling.
- finish annealing was performed at 1000 ° C. in a dry hydrogen atmosphere.
- the oxygen potential P H2O / P H2 was set to 3 ⁇ 10 ⁇ 4 at 300 to 500 ° C. at the time of temperature increase, and set to 1 ⁇ 10 ⁇ 4 during soaking to obtain a non-oriented electrical steel sheet.
- the samples of components A to C which are comparative examples, have 2 [Si] +2 [Al] + [Cr] ⁇ 10% by mass, when compared with those of the same plate thickness
- the iron loss W10 / 3000 was large.
- the samples of components D to L are all 2 [Si] +2 [Al] + [Cr] ⁇ 10% by mass, and the iron loss W10 / 3000 is small compared with the samples of components A to C having the same plate thickness. .
- the iron loss W10 / 800 of the sample with (2 [Al] + [Cr]) / 2 [Si] -10t 2 > 0.35 is larger than that of the same plate thickness.
- Tables 6 and 7 below show the measurement results of iron loss W10 / 3000 and iron loss W10 / 400.
- (2 [Al] + [Cr]) / 2 [Si] -5t 2 was calculated for each sample, the results shown in Table 6 and Table 7 below were obtained.
- the present invention can be used as a material for a motor core that is driven at a high speed and driven at a high frequency, such as an electric vehicle and a hybrid vehicle.
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Abstract
Description
10質量%≦2[Si]+2[Al]+[Cr]<15質量% ・・・式1
(2[Al]+[Cr])/2[Si]-10t2≦0.35 ・・・式2
(ここで、[Si]、[Al]、[Cr]はそれぞれ前記無方向性電磁鋼板のSi含有量、Al含有量、Cr含有量(質量%)であり、tは前記無方向性電磁鋼板の板厚(mm)である。)
(2)さらに、以下の式3を満たすことを特徴とする(1)に記載の無方向性電磁鋼板。
(2[Al]+[Cr])/2[Si]-5t2≦0.35 ・・・式3
(3)さらに、Mn:0.2質量%以上1.5質量%以下を含有することを特徴とする(1)に記載の無方向性電磁鋼板。
(2[Al]+[Cr])/2[Si]-10t2≦0.35
ここで、tは製品である無方向性電磁鋼板の板厚(mm)である。
(2[Al]+[Cr])/2[Si]-5t2≦0.35
Mnを含む場合には、Mn含有量を1.5質量%以下とすることが好ましい。Mnも効果代は小さいものの鋼板の固有抵抗を増加させるが、1.5質量%を超えると脆化する可能性がある。下限は特に限定しないが、硫化物の微細析出を抑制する観点から0.2質量%以上であることがさらに好ましい。
まず、C:0.002質量%、S:0.002質量%、N:0.002質量%、及びMn:0.3質量%を含有し、Si、Al、Crについては、以下の表1に示す組成の熱間圧延板を用意して酸洗を行い、冷間圧延により厚さ0.25mmの冷間圧延板を得た。次に、表1に示す条件で酸素ポテンシャルを制御し、1000℃で仕上げ焼鈍を実施し、無方向性電磁鋼板を得た。
まず、C:0.002質量%、S:0.002質量%、N:0.002質量%、及びMn:0.3質量%を含有し、Si、Al、Crについては、以下の表3に示すような成分A~成分Lの熱間圧延板を用意して酸洗を行い、冷間圧延により厚さ0.15mm~0.30mmの冷間圧延板を得た。次に、乾水素雰囲気中で1000℃の仕上焼鈍を実施した。このときの酸素ポテンシャルPH2O/PH2は、昇温時の300~500℃では3×10-4とし、均熱中では1×10-4とし、無方向性電磁鋼板を得た。
Claims (3)
- C:0.005質量%以下、S:0.003質量%以下、N:0.003質量%以下、Si:2.0質量%以上4.5質量%未満、Al:0.15質量%以上2.5質量%未満、及びCr:0.3質量%以上5.0質量%未満を含有し、残部がFe及び不可避的不純物からなり、表面側に厚さが0.01μm以上0.5μm以下のCr酸化物を含む層を有し、さらに以下の式1及び式2を満たすことを特徴とする無方向性電磁鋼板。
10質量%≦2[Si]+2[Al]+[Cr]<15質量% ・・・式1
(2[Al]+[Cr])/2[Si]-10t2≦0.35 ・・・式2
(ここで、[Si]、[Al]、[Cr]はそれぞれ前記無方向性電磁鋼板のSi含有量、Al含有量、Cr含有量(質量%)であり、tは前記無方向性電磁鋼板の板厚(mm)である。) - さらに、以下の式3を満たすことを特徴とする請求項1に記載の無方向性電磁鋼板。
(2[Al]+[Cr])/2[Si]-5t2≦0.35 ・・・式3 - さらに、Mn:0.2質量%以上1.5質量%以下を含有することを特徴とする請求項1に記載の無方向性電磁鋼板。
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JP2020139198A (ja) * | 2019-02-28 | 2020-09-03 | 日本製鉄株式会社 | 無方向性電磁鋼板 |
JP2020169369A (ja) * | 2019-04-05 | 2020-10-15 | 日本製鉄株式会社 | 無方向性電磁鋼板 |
CN113692452A (zh) * | 2019-04-17 | 2021-11-23 | 杰富意钢铁株式会社 | 无方向性电磁钢板 |
EP4152564A4 (en) * | 2020-06-25 | 2023-11-01 | JFE Steel Corporation | ENGINE CORE AND MOTOR |
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