WO2020136993A1 - 無方向性電磁鋼板およびその製造方法 - Google Patents
無方向性電磁鋼板およびその製造方法 Download PDFInfo
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- WO2020136993A1 WO2020136993A1 PCT/JP2019/033418 JP2019033418W WO2020136993A1 WO 2020136993 A1 WO2020136993 A1 WO 2020136993A1 JP 2019033418 W JP2019033418 W JP 2019033418W WO 2020136993 A1 WO2020136993 A1 WO 2020136993A1
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Definitions
- the present invention relates to a non-oriented electrical steel sheet and a method for producing the same, and specifically to a non-oriented electrical steel sheet with a low iron loss in a high frequency range and a method for producing the same.
- HEV hybrid electric vehicle
- EV electric motor Electric vehicles
- FCEV fuel cell vehicles
- the motors used in the HEV, EV, FCEV and the like are generally driven in a high frequency range advantageous for high speed rotation in order to improve motor efficiency.
- Non-oriented electrical steel sheets are often used as the iron core material of the motor, and in order to achieve high efficiency of the motor, the steel sheet is strongly required to have a low iron loss in a high frequency range.
- non-oriented electrical steel sheets have been made to have a low iron loss by mainly adding alloying elements such as Si and Al to increase the specific resistance or reducing the eddy current loss by reducing the sheet thickness.
- alloying elements such as Si and Al
- the addition of a large amount of alloying elements leads to a reduction in the saturation magnetic flux density even though the iron loss can be reduced.
- a decrease in magnetic flux density leads to an increase in motor copper loss, resulting in a decrease in motor efficiency.
- reducing the plate thickness requires reducing the plate thickness of the hot-rolled steel plate and increasing the cold rolling reduction rate, which causes a problem of lowering productivity. Therefore, if a non-oriented electrical steel sheet with high magnetic flux density and high frequency and low iron loss that does not reduce the magnetic flux density or lower the productivity is developed, it will greatly contribute to the high efficiency of electrical equipment. Conceivable.
- Patent Document 1 discloses a method of increasing the specific resistance of steel by adding Cr to achieve the low iron loss in the high frequency region. It is disclosed.
- Patent Document 1 since Cr is an element that lowers the saturation magnetic flux density, the technology disclosed in Patent Document 1 cannot achieve both high magnetic flux density and high frequency low iron loss, and there is a demand for recent non-oriented electrical steel sheets. Can not fully respond to.
- the present invention has been made in view of the above problems of the prior art, and an object thereof is to achieve high magnetic flux density-high frequency and low iron loss without causing a decrease in magnetic flux density or productivity.
- An object is to provide a grain-oriented electrical steel sheet and to propose an advantageous manufacturing method thereof.
- the inventors have made intensive studies to solve the above-mentioned problems, focusing on the influence of the surface condition on the magnetic properties of the non-oriented electrical steel sheet. As a result, by controlling the content of Zn contained in the steel in a predetermined range, by controlling the nitrogen content in steel of the steel sheet surface layer after finish annealing and the nitrogen content in the total thickness of steel in a predetermined range. The inventors have found that the iron loss can be reduced without lowering the magnetic flux density, and have developed the present invention.
- C 0.0050 mass% or less, Si: 2.8 to 6.5 mass%, Mn: 0.05 to 2.0 mass%, P: 0.10 mass% or less, S: 0. 0050 mass% or less, Al: 0.3 to 2.0 mass%, N: 0.0050 mass% or less, Zn: 0.0005 to 0.0050 mass%, Ti: 0.0030 mass% or less, Nb: 0.0030 mass% or less, and O: 0.0050 mass% or less
- the thickness of the steel sheet is t (mm), the thickness is 1/20 from one side surface of the steel sheet.
- the non-oriented electrical steel sheet of the present invention further comprises, in addition to the above composition, one or two selected from Sn: 0.005 to 0.20 mass% and Sb: 0.005 to 0.20 mass%. It is characterized by containing.
- the non-oriented electrical steel sheet of the present invention is characterized by further containing at least one group of the following group A and group B in addition to the above component composition.
- group A 0.0005 to 0.020 mass% in total of one or more selected from Ca
- Mg and REM Group B 0.01 to 1.0 mass% in total of one or more selected from Cu, Ni and Cr
- non-oriented electrical steel sheet of the present invention is characterized by having a plate thickness of 0.30 mm or less.
- the present invention hot-rolls a steel slab having any one of the above-described component compositions, hot-rolled sheet annealing, cold rolling once or cold rolling twice or more with intermediate annealing sandwiched.
- the dew point of the heating zone and the soaking zone during the annealing of the hot rolled sheet is controlled in the range of 0 to 70° C.
- the atmosphere during annealing is one gas or a mixed gas of two or more gases selected from nitrogen, hydrogen and a rare gas, and the nitrogen content of the atmosphere is 30 vol% or less and the dew point is -20°C or less.
- a method of manufacturing a non-oriented electrical steel sheet is proposed.
- the method for manufacturing a non-oriented electrical steel sheet according to the present invention is characterized in that the final thickness is 0.30 mm or less.
- iron loss can be reduced in a high frequency range without causing a decrease in magnetic flux density, it can be used as a material for a motor core of a hybrid electric vehicle, an electric vehicle, a high speed generator, an air conditioner compressor, a cleaner, a machine tool or the like. It can be preferably used.
- FIG. 1 shows the results of the above-mentioned measurement, and a decrease in iron loss was observed in the range of 0.0005 to 0.0050 mass% Zn.
- this final annealing plates exist as AlN in the concentration N 1 (mass%) and the steel sheet total thickness N which are present as AlN in the layer from one surface of the steel sheet by electrolytic extraction to a thickness of 1/20
- concentration N 2 (mass %) of N present was analyzed.
- the following formula (1) (T ⁇ N 2 )/ ⁇ (t/10) ⁇ N 1 ⁇ 5.0 (1)
- the ratio of the amount of nitrogen forming AlN in the total thickness of the steel plate to the amount of nitrogen forming AlN in the layer (surface layer) from one surface of the steel plate to the plate thickness 1/20 represented by It was found to have a strong correlation with.
- FIG. 1 The ratio of the amount of nitrogen forming AlN in the total thickness of the steel plate to the amount of nitrogen forming AlN in the layer (surface layer) from one surface of the steel plate to the plate thickness 1/20 represented by It was found to have a strong correlation with.
- the reason why the iron loss was reduced in the steel sheet to which a small amount of Zn was added is that the zinc oxide film is formed on the surface layer of the steel sheet during finish annealing, and nitrogen penetration (nitriding) into the steel sheet is suppressed. It is thought that it was because it was done.
- the dew point during hot-rolled sheet annealing was variously changed in the range of -30°C to 70°C.
- Finish annealing was performed at 1000° C. for 10 seconds in an atmosphere of ° C.
- C contained in the product plate is a harmful element that causes magnetic aging, forms carbides and precipitates, and deteriorates iron loss characteristics. Therefore, C contained in the material is limited to 0.0050 mass% or less. Preferably, it is 0.0040 mass% or less.
- the lower limit of C is not particularly specified, but is preferably about 0.0001 mass% from the viewpoint of suppressing the decarburization cost in the refining process.
- Si 2.8 to 6.5 mass% Si has the effect of increasing the specific resistance of steel and reducing iron loss. Further, since it has the effect of increasing the strength of steel by solid solution strengthening, it is contained at 2.8 mass% or more. On the other hand, if it exceeds 6.5 mass %, rolling becomes difficult, so the upper limit is made 6.5 mass %. It is preferably in the range of 3.0 to 6.0 mass %.
- Mn 0.05 to 2.0 mass% Mn, like Si, is an element useful for increasing the specific resistance and strength of steel. Further, since it is also an element that forms a sulfide to improve hot brittleness, it is contained in an amount of 0.05 mass% or more. On the other hand, the addition of more than 2.0 mass% causes slab cracking and the like and deteriorates the operability in steel making, so the upper limit is made 2.0 mass%. It is preferably in the range of 0.1 to 1.5 mass %.
- P 0.10 mass% or less
- P is an element that has a large effect of increasing the specific resistance and reducing the eddy current loss, and thus can be appropriately added.
- the upper limit is made 0.10 mass %. It is preferably 0.05 mass% or less.
- S 0.0050 mass% or less
- S is a sulfide and forms precipitates and inclusions, which lowers manufacturability (hot rolling property) and magnetic properties of the product sheet, and therefore, a smaller amount is preferable. Therefore, in the present invention, the upper limit of S is set to 0.0050 mass%. It is preferably 0.0030 mass% or less.
- Al 0.3 to 2.0 mass% Similar to Si, Al has the effect of increasing the specific resistance of steel and reducing iron loss. However, if it exceeds 2.0 mass %, the steel becomes brittle and rolling becomes difficult, so the upper limit is made 2.0 mass %. On the other hand, when Al is less than 0.3 mass %, fine nitrides are formed and precipitated, which rather deteriorates the iron loss characteristics, so the lower limit is made 0.3 mass %. It is preferably in the range of 0.4 to 1.5 mass %.
- N 0.0050 mass% or less
- N is a harmful element that forms a nitride and deteriorates the magnetic properties, so N is limited to 0.0050 mass% or less. It is preferably 0.0040 mass% or less.
- Zn 0.0005 to 0.0050 mass%
- Zn has the effect of suppressing nitriding during finish annealing, so 0.0005 mass% or more is added.
- sulfides are formed and the iron loss is rather increased, so the content is limited to 0.0050 mass% or less. It is preferably in the range of 0.001 to 0.004 mass %.
- Zn is an element with a high vapor pressure, it is an element that is not normally mixed in steel, but it should be mixed when scrap is added to molten steel after deoxidation in the refining process for the purpose of adjusting temperature and the like. There is. Therefore, in order to control the Zn content within an appropriate range, it is important to carefully select raw materials and scraps to be used.
- Ti and Nb are harmful elements that form and precipitate fine carbonitrides to increase iron loss.
- the content exceeds 0.0030 mass%, the above-mentioned adverse effects become remarkable, so the respective upper limits are made 0.0030 mass%.
- each is 0.0020 mass% or less.
- O 0.0050 mass% or less
- O is a harmful element that forms an oxide and deteriorates the magnetic characteristics, and therefore is limited to 0.0050 mass% or less. It is preferably 0.0040 mass% or less.
- the balance other than the above components is Fe and inevitable impurities, but in addition to the above components, the following components may be contained depending on the required characteristics.
- Sn 0.005 to 0.20 mass%
- Sb 0.005 to 0.20 mass%
- Sn and Sb have the effects of improving the recrystallization texture and improving the magnetic flux density and iron loss. In order to obtain the above effect, it is necessary to add 0.005 mass% or more. However, even if added in excess of 0.20 mass %, the above effect will be saturated. Therefore, when adding Sn and Sb, it is preferable to set each in the range of 0.005 to 0.20 mass %.
- Ca, Mg and REM 0.0005 to 0.020 mass% in total Ca, Mg and REM (rare earth metal: Rare Earth Metal) have the effect of forming stable sulfides and improving grain growth.
- the total amount is preferably 0.0005 to 0.020 mass %.
- Cu, Ni and Cr 0.01 to 1.0 mass% in total Cu, Ni and Cr have the effects of increasing the specific resistance of the steel to reduce iron loss and increasing the strength of the steel.
- addition of more than 1.0 mass% causes an increase in raw material cost. Therefore, when Cu, Ni and Cr are added, the total amount is preferably 0.01 to 1.0 mass %. More preferably, it is in the range of 0.1 to 0.5 mass %.
- the non-oriented electrical steel sheet of the present invention produces a steel material (slab) having the above-described composition, and hot-rolls the slab into a hot-rolled sheet, and after hot-rolled sheet annealing, once or It can be manufactured by a manufacturing method including a series of steps in which a cold-rolled plate having a final plate thickness is obtained by cold rolling two or more times with an intermediate anneal sandwiched therebetween, and finish annealing is performed. The details will be described below.
- the steel slab used in the production of the non-oriented electrical steel sheet of the present invention is a steel having a component composition compatible with the present invention, which is generally known refining using a converter, an electric furnace, a vacuum degassing device, or the like. It can be melted in the process and can be manufactured by a conventional continuous casting method or an ingot-slab rolling method. In addition, a thin cast piece having a thickness of 100 mm or less may be manufactured by the direct casting method.
- the above steel slab is hot-rolled into a hot-rolled sheet by a generally known method.
- the steel slab is usually reheated to a predetermined temperature in a heating furnace and then subjected to hot rolling, but it may be immediately subjected to hot rolling without reheating after casting. Further, in the case of a thin slab, hot rolling may be performed, or hot rolling may be omitted and the process may be directly performed in the subsequent steps.
- the soaking temperature is preferably in the range of 800 to 1100°C. If the temperature is lower than 800°C, the effect of hot-rolled sheet annealing is small and a sufficient magnetic property improving effect cannot be obtained. On the other hand, if the temperature exceeds 1100°C, the crystal grains become coarse and brittle fracture during cold rolling (plate rupture). ), or disadvantage in manufacturing cost. Further, the soaking time is preferably 3 minutes or less from the viewpoint of ensuring productivity. More preferably, the soaking temperature is 850 to 1000° C., and the soaking time is 1 min or less.
- the dew points of the heating zone and soaking zone in hot-rolled sheet annealing must be 0°C or higher and 70°C or lower. If the dew point is less than 0° C., the oxide layer on the surface generated during annealing is easily removed during pickling, so that nitriding is easily performed during finish annealing, which causes an increase in iron loss. On the other hand, when the dew point is higher than 70° C., the oxidation of the steel sheet surface proceeds too much, and it becomes difficult to remove the scale generated during annealing, so the pickling load increases and the productivity is impaired.
- the steel sheet after annealing the hot-rolled sheet is then cold-rolled once or cold-rolled twice or more with an intermediate annealing to obtain a cold-rolled sheet having a final thickness.
- the final sheet thickness (product sheet thickness) of cold rolling is preferably 0.30 mm or less from the viewpoint of obtaining the iron loss reducing effect.
- the cold-rolled sheet is subjected to finish annealing, and an insulating coating is applied if necessary to obtain a product sheet.
- the soaking condition for the finish annealing is preferably in the range of 900 to 1200° C. ⁇ 1 to 120 sec from the viewpoint of coarsening the crystal grain size and reducing iron loss. More preferably, it is in the range of 1000 to 1100° C. ⁇ 5 to 60 seconds.
- the atmosphere gas in the finish annealing is one kind or a mixed gas of two or more kinds selected from N 2 , H 2 and a rare gas from the viewpoint of suppressing nitriding during annealing, and It is necessary that the content of N 2 in the atmosphere gas is 30 vol% or less.
- N 2 :N 2 80:20 in a vol% ratio.
- a preferable nitrogen partial pressure is 50 vol% or less.
- the dew point needs to be ⁇ 20° C. or lower from the viewpoint of preventing the oxidation of the steel sheet surface.
- a preferable dew point is ⁇ 40° C. or lower.
- the loss W 10/400 was measured. Further, a test piece was taken from the above sample, subjected to electrolytic extraction analysis, and the nitrogen concentration N 1 (mass%) existing as AlN from one surface of the steel plate to a depth of 1/20 of the plate thickness, in all plate thicknesses. The nitrogen concentration N 2 (mass %) existing as AlN was analyzed, and the ratio of the nitrogen amount from one surface of the steel plate to the depth of 1/20 of the plate thickness and the nitrogen amount of the total plate thickness ((t ⁇ N 2 ) / ⁇ (T/10) ⁇ N 1 ⁇ ) was obtained.
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Abstract
Description
(t×N2)/{(t/10)×N1}≧5.0 ・・・(1)
を満たすことを特徴とする無方向性電磁鋼板である。
記
・A群;Ca,MgおよびREMから選ばれる1種または2種以上を合計で0.0005~0.020mass%
・B群;Cu,NiおよびCrから選ばれる1種または2種以上を合計で0.01~1.0mass%
<実験1>
C:0.0025mass%、Si:3.3mass%、Mn:0.6mass%、P:0.01mass%、S:0.0022mass%、Al:0.9mass%、N:0.0019mass%、Ti:0.0011mass%、Nb:0.0009mass%およびO:0.0024mass%を含有し、さらに、Znを0.0001~0.01mass%の範囲で種々に変化して含有し、残部がFeおよび不可避不純物を有する鋼を真空炉で溶製し、鋳造して鋼塊とした後、熱間圧延して板厚2.0mmの熱延板とし、950℃×30sec(加熱帯、均熱帯の露点:55℃)の熱延板焼鈍し、酸洗した後、冷間圧延して最終板厚0.25mmの冷延板とし、vol%比でH2:N2=30:70、露点:-55℃の雰囲気下で1025℃×10secの仕上焼鈍を施した。
(t×N2)/{(t/10)×N1}≧5.0 ・・・(1)
で表される、鋼板の片側表面から板厚1/20までの層(表層)においてAlNを形成している窒素量に対する、鋼板全厚においてAlNを形成している窒素量の比が鉄損特性と強い相関があることがわかった。図2は、上記表層においてAlNを形成している窒素量に対する全板厚においてAlNを形成している窒素量の比(上記(1)式の左辺)と鉄損W10/400との関係を示したものであり、上記比が5.0以上で鉄損を大きく低下すること、また、上記比が5.0以上である鋼板は、いずれもZnの含有量が0.0005~0.0050mass%の範囲内にあることがわかった。
次に、磁気特性におよぼす熱延板焼鈍時の露点の影響について調査した。
C:0.0021mass%、Si:3.7mass%、Mn:0.4mass%、P:0.01mass%、S:0.0016mass%、Al:0.6mass%、N:0.0022mass%、Zn:0.0028mass%、Ti:0.0014mass%、Nb:0.0010mass%およびO:0.0025mass%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の鋼を真空炉で溶製し、鋳造して鋼塊とした後、熱間圧延して板厚1.8mmの熱延板とし、900℃×30secの熱延板焼鈍を施した。この際、熱延板焼鈍時(加熱帯、均熱帯)の露点を-30℃から70℃の範囲で種々に変化させた。その後、上記熱延板焼鈍後の鋼板を酸洗し、冷間圧延して最終板厚0.20mmの冷延板とし、vol%比でH2:N2=50:50、露点:-55℃の雰囲気下で1000℃×10secの仕上焼鈍を施した。
次に、磁気特性におよぼす仕上焼鈍時の窒素分圧の影響について調査した。
C:0.0028mass%、Si:3.6mass%、Mn:0.4mass%、P:0.01mass%、S:0.0018mass%、Al:1.2mass%、N:0.0021mass%、Zn:0.0025mass%、Ti:0.0013mass%、Nb:0.0009mass%およびO:0.0024mass%を含有し、残部がFeおよび不可避的不純物を有する鋼を真空炉で溶製し、鋳造して鋼塊とした後、熱間圧延して板厚1.8mmの熱延板とし、920℃×30secの熱延板焼鈍(加熱帯、均熱帯の露点:65℃)を施し、酸洗した後、冷間圧延して最終板厚0.27mmの冷延板とし、1020℃×10secの仕上焼鈍を施した。この際、仕上焼鈍時の雰囲気を水素と窒素の混合ガス(露点-55℃)とし、混合雰囲気中の窒素分圧を0~100vol%の範囲で種々に変化させた。
本発明は、上記<実験1>~<実験3>の結果に、さらに検討を加えて完成したものである。
C:0.0050mass%以下
製品板中に含まれるCは、磁気時効を起こし、炭化物を形成して析出し、鉄損特性を劣化させる有害元素である。そのため素材中に含まれるCは0.0050mass%以下に制限する。好ましくは、0.0040mass%以下である。なお、Cの下限は、特に規定しないが、精錬工程での脱炭コストを抑制する観点から、0.0001mass%程度とするのが好ましい。
Siは、鋼の固有抵抗を高め、鉄損を低減する効果がある。また、固溶強化により鋼の強度を高める効果があるため、2.8mass%以上含有させる。一方、6.5mass%を超えると、圧延することが困難になるため、上限は6.5mass%とする。好ましくは3.0~6.0mass%の範囲である。
Mnは、Siと同様、鋼の固有抵抗と強度を高めるのに有用な元素である。また、硫化物を形成して熱間脆性を改善する元素でもあるので、0.05mass%以上含有させる。一方、2.0mass%を超える添加は、スラブ割れ等を引き起こして、製鋼での操業性を悪化するため、上限は2.0mass%とする。好ましくは0.1~1.5mass%の範囲である。
Pは、固有抵抗を高めて、渦電流損を低減する効果が大きい元素であるため、適宜添加することができる。しかし、Pの過剰な添加は、冷間圧延性の悪化を招くので、上限は0.10mass%とする。好ましくは0.05mass%以下である。
Sは、硫化物となって析出物や介在物を形成し、製造性(熱間圧延性)や製品板の磁気特性を低下させるので、少ないほど好ましい。そこで、本発明ではSの上限を0.0050mass%とする。好ましくは0.0030mass%以下である。
Alは、Siと同様、鋼の固有抵抗を高めて、鉄損を低減する効果がある。しかし、2.0mass%を超えると、鋼が脆化し、圧延することが困難になるため、上限は2.0mass%とする。一方、Alが0.3mass%未満となると、微細な窒化物を形成して析出し、却って鉄損特性を悪化させるため、下限は0.3mass%とする。好ましくは0.4~1.5mass%の範囲である。
Nは、窒化物を形成して磁気特性を劣化させる有害元素であるため、0.0050mass%以下に制限する。好ましくは0.0040mass%以下である。
Znは、上記<実験3>で説明したように、仕上焼鈍時の窒化を抑制する効果があるため、0.0005mass%以上添加する。一方、0.0050mass%を超えて添加すると、硫化物を形成し、却って鉄損を増加させるため、0.0050mass%以下に制限する。好ましくは0.001~0.004mass%の範囲である。
TiおよびNbは、微細な炭窒化物を形成して析出し、鉄損を増加させる有害元素である。特に0.0030mass%を超えると、上記悪影響が顕著になるため、それぞれの上限を0.0030mass%とする。好ましくはそれぞれ0.0020mass%以下である。
Oは、酸化物を形成し、磁気特性を劣化させる有害元素であるため、0.0050mass%以下に制限する。好ましくは0.0040mass%以下である。
Sn:0.005~0.20mass%、Sb:0.005~0.20mass%
SnおよびSbは、再結晶集合組織を改善し、磁束密度や鉄損を改善する効果がある。上記効果を得るためには0.005mass%以上の添加が必要である。しかし、0.20mass%を超えて添加しても、上記効果が飽和してしまう。よって、SnおよびSbを添加する場合は、それぞれ0.005~0.20mass%の範囲とするのが好ましい。
Ca,MgおよびREM(希土類金属:Rare Earth Metal)は、安定な硫化物を形成し、粒成長性を改善する効果がある。上記効果を得るためには、Ca,MgおよびREMを合計で0.0005mass%以上添加する必要がある。しかし、0.020mass%を超えて添加しても、上記効果は飽和してしまう。よって、Ca,MgおよびREMを添加する場合は、合計で0.0005~0.020mass%の範囲とするのが好ましい。
Cu,NiおよびCrは、鋼の固有抵抗を高めて鉄損を低減するとともに、鋼の強度を高める効果がある。上記効果を得るためには、Cu,NiおよびCrを合計で0.01mass%以上添加する必要がある。しかし、1.0mass%を超える添加は、原料コストの上昇を招く。よって、Cu,NiおよびCrを添加する場合は、合計で0.01~1.0mass%の範囲とするのが好ましい。より好ましくは0.1~0.5mass%の範囲である。
本発明の無方向性電磁鋼板は、上記した成分組成を有する鋼素材(スラブ)を製造し、該スラブを熱間圧延して熱延板とし、熱延板焼鈍を施した後、1回または中間焼鈍を挟む2回以上の冷間圧延により最終板厚の冷延板とし、仕上焼鈍を施す一連の工程からなる製造方法で製造することができる。以下、具体的に説明する。
斯くして得た製品板からサンプルを採取し、圧延方向(L方向)および幅方向(C方向)から、幅30mm×長さ180mmの試験片を切り出し、エプスタイン試験にて(L+C)方向の鉄損W10/400を測定した。また、上記サンプルから試験片を採取し、電解抽出分析して、鋼板の片側表面から板厚1/20の深さまでにおいてAlNとして存在している窒素濃度N1(mass%)、全板厚においてAlNとして存在している窒素濃度N2(mass%)を分析し、鋼板の片側表面から板厚1/20の深さまでの窒素量と全板厚の窒素量の比((t×N2)/{(t/10)×N1})を求めた。
Claims (6)
- C:0.0050mass%以下、Si:2.8~6.5mass%、Mn:0.05~2.0mass%、P:0.10mass%以下、S:0.0050mass%以下、Al:0.3~2.0mass%、N:0.0050mass%以下、Zn:0.0005~0.0050mass%、Ti:0.0030mass%以下、Nb:0.0030mass%以下およびO:0.0050mass%以下を含有し、残部がFeおよび不可避不純物からなる成分組成を有する無方向性電磁鋼板において、
鋼板の板厚をt(mm)、鋼板の片側表面から板厚1/20までの層においてAlNとして存在する窒素濃度をN1(mass%)、全板厚においてAlNとして存在する窒素濃度をN2(mass%)としたとき、上記t、N1およびN2が下記(1)式を満たすことを特徴とする無方向性電磁鋼板。
記
(t×N2)/{(t/10)×N1}≧5.0 ・・・(1) - 上記成分組成に加えてさらに、Sn:0.005~0.20mass%およびSb:0.005~0.20mass%のうちから選ばれる1種または2種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。
- 上記成分組成に加えてさらに、下記A群およびB群のうちの少なくとも1群の成分を含有することを特徴とする請求項1または2に記載の無方向性電磁鋼板。
記
・A群;Ca,MgおよびREMから選ばれる1種または2種以上を合計で0.0005~0.020mass%
・B群;Cu,NiおよびCrから選ばれる1種または2種以上を合計で0.01~1.0mass% - 板厚が0.30mm以下であることを特徴とする請求項1~3のいずれか1項に記載の無方向性電磁鋼板。
- 請求項1~3のいずれか1項に記載の成分組成を有する鋼スラブを熱間圧延し、熱延板焼鈍し、1回の冷間圧延または中間焼鈍を挟む2回以上の冷間圧延して最終板厚とした後、仕上焼鈍を施す無方向性電磁鋼板の製造方法において、
上記熱延板焼鈍時の加熱帯および均熱帯の露点を0~70℃の範囲に制御するとともに、
上記仕上焼鈍時の雰囲気を、窒素、水素および希ガスから選ばれる1種のガスまたは2種以上の混合ガスとし、かつ、上記雰囲気の窒素含有量を30vol%以下、露点を-20℃以下とすることを特徴とする無方向性電磁鋼板の製造方法。 - 上記最終板厚を0.30mm以下とすることを特徴とする請求項5に記載の無方向性電磁鋼板の製造方法。
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| CA3122122A1 (en) | 2020-07-02 |
| CN113166869A (zh) | 2021-07-23 |
| KR102530719B1 (ko) | 2023-05-09 |
| US12448662B2 (en) | 2025-10-21 |
| TW202024352A (zh) | 2020-07-01 |
| US20220056548A1 (en) | 2022-02-24 |
| MX2021007757A (es) | 2021-08-05 |
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| EP3904551A4 (en) | 2022-04-06 |
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