WO2020090156A1 - 無方向性電磁鋼板の製造方法 - Google Patents
無方向性電磁鋼板の製造方法 Download PDFInfo
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Definitions
- the present invention relates to a method for manufacturing a non-oriented electrical steel sheet, and specifically to a method for manufacturing a non-oriented electrical steel sheet with low iron loss and high magnetic flux density, which is mainly used in motors for automobiles.
- HEV hybrid electric vehicles
- EV electric vehicles
- FCEV fuel cell vehicles
- Non-oriented electrical steel sheets are generally used as iron core materials for drive motors such as HEVs and EVs, and induction motors, and non-oriented electrical steel sheets are used to achieve high motor efficiency. It is desirable that the iron loss is low.
- non-oriented electrical steel sheets have been made to have a low iron loss mainly by adding elements such as Si and Al that increase specific resistance or by reducing the sheet thickness to reduce eddy current loss. It was However, addition of a large amount of alloying elements causes a decrease in the saturation magnetic flux density, so even if the iron loss can be reduced, the decrease in the magnetic flux density cannot be avoided. A decrease in magnetic flux density leads to an increase in motor copper loss, which leads to a decrease in motor efficiency.
- the reduction of the sheet thickness requires the reduction of the hot rolled sheet thickness and the increase of the cold rolling reduction rate, which causes a problem that the rolling load increases and the productivity decreases. Therefore, there is a demand for development of another means capable of realizing high magnetic flux density and low iron loss of the non-oriented electrical steel sheet.
- Patent Document 1 discloses a technique for increasing the specific resistance of steel by adding Cr in the range of 1.5 wt% or more and 20 wt% or less. There is.
- 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 low iron loss, which is severe in recent years for non-oriented electrical steel sheets. We cannot meet the demand sufficiently.
- the present invention has been made in view of the above problems that the conventional technology has, and its object is to provide a non-oriented electrical steel sheet that can stably achieve both high magnetic flux density and low iron loss. To propose a manufacturing method.
- the inventors have conducted intensive studies to solve the above problems, focusing on the influence of impurities on the magnetic properties of the non-oriented electrical steel sheet. As a result, by sufficiently reducing the amount of nitrogen in the steel sheet after finish annealing, it was found that low iron loss can be realized without causing a decrease in magnetic flux density, and the present invention was developed. ..
- C 0.0050 mass% or less
- Si 1.0 to 6.5 mass%
- Mn 0.05 to 2.0 mass%
- S 0.0050 mass% or less
- Al 0. Steel slab having a composition of 01 mass% or less
- N 0.0050 mass% or less
- Ti 0.0030 mass% or less
- Nb 0.0030 mass% or less
- O 0.0050 mass% or less
- the balance being Fe and inevitable impurities.
- T (° C) is the following formula (1);
- the atmosphere of the finish annealing is a mixed gas containing at least one selected from N 2 , H 2 and a rare gas, and having an N 2 content of 50 vol% or less.
- the above steel slab used in the method for producing a non-oriented electrical steel sheet of the present invention is characterized by further containing P: 0.03 to 0.20 mass% in addition to the above component composition.
- the steel slab used in the method for producing a non-oriented electrical steel sheet of the present invention in addition to the above-mentioned composition, further comprises Sn: 0.005 to 0.20 mass% and Sb: 0.005 to 0.20 mass%. It is characterized by containing one or two selected from the above.
- the steel slab used in the method for producing a non-oriented electrical steel sheet of the present invention in addition to the above-mentioned composition, further comprises one or more selected from Ca, Mg and REM in a total amount of 0.0005. It is characterized by containing 0.020 mass%.
- the steel slab used in the method for producing a non-oriented electrical steel sheet of the present invention in addition to the above component composition, further contains one or more selected from Cu, Ni and Cr in a total amount of 0.01. It is characterized by containing ⁇ 1.0 mass%.
- the present invention it is possible to stably manufacture a low iron loss non-oriented electrical steel sheet without causing a decrease in magnetic flux density. Therefore, according to the present invention, it is possible to stably provide a non-oriented electrical steel sheet suitable as a core material of a motor for hybrid electric vehicles, electric vehicles, vacuum cleaners, high-speed generators, air conditioner compressors, machine tools, and the like. it can.
- the result of the above measurement is shown in FIG. 1.
- the iron loss W 15/50 was about 50% even though the finish annealing atmosphere was almost the same in the N 2 atmosphere and the vacuum.
- the N 2 atmosphere showed a significantly higher value than that in the vacuum.
- the N content in the steel of both test pieces was analyzed.
- FIG. 2 in the test piece annealed in the N 2 atmosphere, the steel before and after the finish annealing was analyzed. Although there was almost no change in the amount of N in the medium, it was found that the N amount in the steel after finish annealing was greatly reduced in the test piece annealed in vacuum.
- FIG. 3 shows the results of the above-mentioned test. As the nitrogen content in the steel after finish annealing becomes lower, the iron loss also decreases, and particularly when the nitrogen content in the steel is 25 massppm or less, the iron loss significantly decreases. I found out.
- N in the steel forms a nitride such as Si 3 N 4 after finish annealing and precipitates to prevent the magnetic domain wall movement, thereby causing hysteresis. It is thought to increase the loss. Therefore, by reducing the amount of N by some means during the finish annealing, the nitride loss such as Si 3 N 4 is reduced, and the hysteresis loss is reduced. Further, it can be expected that the lattice strain is reduced due to the reduction of the amount of solute N itself, which facilitates the movement of the domain wall in the product plate and reduces the hysteresis loss.
- a test piece having a width of 30 mm and a length of 180 mm is taken from the rolling direction (L direction) and the rolling right angle direction (C direction) of the product sheet, and the iron loss W 15/50 in the L + C direction is measured by an Epstein test. It was measured.
- the temperature (° C.) required for solid solution of AlN and Si 3 N 4 is obtained by the following equation (1).
- the temperature required to completely form a solid solution of AlN and Si 3 N 4 used in the ⁇ Experiment 4> was calculated from the above equation (1) to be 989 ° C., which is in good agreement with the result of FIG. You can see that The present invention was developed based on the above new findings.
- C 0.0050 mass% or less
- C is a harmful element which, if left in the product sheet, forms carbides to cause magnetic aging and deteriorate iron loss characteristics.
- the present invention limits C to 0.0050 mass% or less.
- 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 reducing the decarburization cost in the refining process.
- Si 1.0 to 6.5 mass% Si is an element that increases the specific resistance of steel and reduces iron loss, and since it has the effect of increasing the strength of steel by solid solution strengthening, it is contained at 1.0 mass% or more. On the other hand, if it exceeds 6.5 mass%, slab cracking may occur or rolling may become difficult, so the upper limit is made 6.5 mass%. It is preferably in the range of 2.0 to 6.0 mass%.
- Mn 0.05 to 2.0 mass%
- Mn is an element effective in increasing the specific resistance and strength of steel, and has the effect of forming sulfides to improve hot embrittlement, so Mn is contained at 0.05 mass% or more.
- the addition of more than 2.0 mass% causes slab cracking and the like and deteriorates the operability in the steelmaking process, so the upper limit is made 2.0 mass%. It is preferably in the range of 0.1 to 1.5 mass%.
- S 0.0050 mass% or less
- S is a sulfide and forms precipitates or inclusions, which deteriorates manufacturability (hot rolling property) and magnetic properties of the product sheet, and therefore is preferably as small as possible. Therefore, the upper limit of S is set to 0.0050 mass%. It is preferably 0.0030 mass% or less.
- Al 0.01 mass% or less
- the texture after finish annealing is randomized, and the texture of ⁇ 100 ⁇ orientation preferable for magnetic properties is insufficiently developed. It is limited to 0.01 mass% or less. It is preferably 0.005 mass% or less, more preferably 0.002 mass% or less.
- N 0.0050 mass% or less
- N is an 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.
- Ti and Nb are fine elements that form fine precipitates and are precipitated to increase iron loss. If both exceed 0.0030 mass%, the above-mentioned adverse effects become remarkable, so the upper limit is made 0.0030 mass%. Preferably, 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 properties, so it is limited to 0.0050 mass% or less. It is preferably 0.0040 mass% or less.
- the steel material used in the present invention may contain the following components in addition to the above essential components.
- P 0.03 to 0.20 mass%
- P has the effect of segregating at the grain boundaries and improving the texture after recrystallization. In order to obtain the above effect, it is necessary to add 0.03 mass% or more. However, the addition of more than 0.20 mass% not only saturates the above-mentioned effect but also lowers the cold rolling property, so the upper limit is made 0.20 mass%. Therefore, when P is added, the range is preferably 0.03 to 0.20 mass%. The range is more preferably 0.05 to 0.10 mass%.
- Sn and Sb have the effects of improving the recrystallization texture and improving the magnetic flux density and iron loss characteristics. In order to obtain the above effect, it is necessary to add 0.005 mass% or more, respectively. On the other hand, even if it is added in an amount exceeding 0.20 mass%, the above effect is saturated. Therefore, when adding Sn and Sb, it is preferable to set each in the range of 0.005 to 0.20 mass%. More preferably, each is in the range of 0.01 to 0.1 mass%.
- Ca, Mg and REM 0.0005 to 0.020 mass% in total Ca, Mg and REM are effective in forming stable sulfides and improving grain growth. In order to obtain the above effect, it is necessary to add 0.0005 mass% or more. On the other hand, even if 0.020 mass% or more is added, the above effect is saturated. Therefore, when Ca, Mg and REM are added, the total amount is preferably 0.0005 to 0.020 mass%. More preferably, it is in the range of 0.001 to 0.01 mass% in total.
- 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 steel to reduce iron loss and increasing the strength of steel.
- addition of more than 1.0 mass% causes not only an increase in raw material cost but also an increase in iron loss. Therefore, when the above-mentioned elements are added, the total amount is preferably in the range of 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 is obtained by hot rolling a steel material (slab) having the above-described component composition into a hot rolled sheet and, if necessary, subjecting the hot rolled sheet to hot rolled sheet annealing.
- a steel material slab
- Manufactured in a series of steps to obtain a cold-rolled sheet having a final thickness by cold rolling once or two or more times with intermediate annealing sandwiched between them, finish annealing, and apply an insulating coating if necessary to obtain a product sheet. be able to.
- the slab used as the above steel material is prepared by continuously refining steel melted in a converter or an electric furnace in a degassing facility, etc., and adjusting it to a predetermined composition, and then performing continuous casting or ingot-making. It can be manufactured by the ingot rolling method.
- the slab is preferably reheated to a temperature (SRT) of 1050 to 1150 ° C. and then subjected to hot rolling.
- SRT a temperature
- the temperature is lower than 1050 ° C, the deformation resistance increases and the rolling load increases, so that it becomes difficult to perform hot rolling.
- the slab temperature after continuous casting can secure the above temperature or the finish rolling finish temperature described below, the slab may be directly subjected to hot rolling without reheating.
- the conditions of hot rolling may be performed under known conditions, but when hot-rolled sheet annealing is not performed, the final pass of finish rolling is performed in the ⁇ single-phase region from the viewpoint of improving magnetic properties, and the finish is It is preferable to make the rolling end temperature (FDT) as high as possible.
- FDT rolling end temperature
- a preferable FDT is a temperature range of 800 ° C. or higher and ⁇ ⁇ ⁇ transformation point or lower.
- the steel sheet after the hot rolling or the hot rolled sheet annealing is subjected to one cold rolling or two or more cold rolling steps with intermediate annealing to obtain a cold rolled sheet having a final thickness.
- the finish thickness of cold rolling is not particularly specified, it is preferably in the range of 0.10 to 0.50 mm. From the viewpoint of achieving both low iron loss and manufacturability, the range of 0.20 to 0.35 mm is more preferable.
- finish annealing is applied to the cold rolled sheet.
- This finish annealing is the most important step in the present invention, and in order to reduce the amount of nitrogen after finish annealing, it is important to control the atmosphere gas and soaking temperature during finish annealing within appropriate ranges.
- the dew point of the atmospheric gas needs to be ⁇ 20 ° C. or lower from the viewpoint of preventing oxidation of the steel sheet surface.
- the N 2 content is 40 vol% or less, and the dew point is -40 ° C or less.
- the section for controlling the atmosphere of finish annealing is a section for heating and soaking.
- the soaking temperature T of finish annealing is the following formula (1); It is necessary to meet.
- the left side of the above formula (1) is a formula representing the temperature (° C.) necessary for completely forming a solid solution of the nitride of AlN or Si 3 N 4
- the soaking temperature T is the above formula (1).
- the value is less than the value on the left side of, the nitrides finely precipitated during the finish annealing cannot be decomposed and cannot be dissolved in steel.
- the soaking temperature T exceeds 1200 ° C., the heat energy cost increases and the heat load of the annealing equipment becomes too large, which is not preferable in terms of equipment maintenance.
- the following formula (2) Temperature range.
- the nitrogen content in the steel material is 0.0050 mass% (50 mass ppm) or less, the nitrogen content in the steel sheet after finish annealing is 0.0025 mass% ( It can be stably reduced to 25 mass ppm or less.
- finish annealing may be performed in a vacuum or a reduced pressure atmosphere.
- the degree of vacuum is 10 ⁇ 3 Pa or less and the annealing temperature T is in the range of 950 to 1100 ° C.
- the steel sheet after the above-mentioned finish annealing is coated with an insulating coating as needed to make a product sheet.
- the insulating coating is appropriately selected from inorganic, organic and inorganic / organic mixed coatings according to the purpose.
- a test piece with a width of 30 mm and a length of 280 mm was taken from each of the rolling direction (L direction) and the plate width direction (C direction) of the product sheet thus obtained after finish annealing, and the iron loss was measured by the Epstein test. W 15/50 was measured. Further, the nitrogen content in the steel was measured for the test piece after the iron loss measurement.
- the steel sheet of the present invention can reduce iron loss without lowering the magnetic flux density, it can be used for drive motors of hybrid electric vehicles (HEV), electric vehicles (EV) driven only by electric motors, and fuel cell vehicles (FCEV). It can be suitably used not only as an iron core material but also as an iron core material for motors such as air compressors, machine tools, high-speed generators, and vacuum cleaners.
- HEV hybrid electric vehicles
- EV electric vehicles
- FCEV fuel cell vehicles
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Abstract
Description
を満たし、さらに、上記仕上焼鈍の雰囲気は、N2、H2および希ガスから選ばれる1種または2種以上を含有し、かつ、N2含有量が50vol%以下の混合ガスとし、上記雰囲気の露点を-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を提案する。
<実験1>
C:0.0029mass%、Si:2.3mass%、Mn:0.7mass%、P:0.01mass%、S:0.0022mass%、Al:0.001mass%、N:0.0034mass%、Ti:0.0008mass%、Nb:0.0009mass%およびO:0.0034mass%を含有し、残部がFeおよび不可避不純物からなる、Al含有量が微量の成分組成を有する鋼を真空炉で溶製し、鋳造して鋼塊とした後、2.0mmまで熱間圧延し、酸洗し、0.25mmの最終板厚まで冷間圧延した後、1050℃×10secの仕上焼鈍を、100%N2雰囲気(露点:-50℃)と、真空中(真空度:10-4torr)の2条件で施した後、幅:30mm×長さ:180mmの試験片を採取し、エプスタイン試験にて磁気特性を測定した。
上記実験に用いたようなAl含有量が低い、いわゆるAlレスの鋼板では、鋼中Nは、仕上焼鈍後にSi3N4等の窒化物を形成して析出し、磁壁移動を妨げることでヒステリシス損を増加させるものと考えられる。そのため、仕上焼鈍時に何らかの手段でN量を低減することによって、Si3N4等の窒化物が低減することでヒステリシス損が低下する。また、固溶N量自体の低減による格子歪の低下により、製品板における磁壁の移動が容易になってヒステリシス損が低減することも期待できる。
次に、上記実験結果に基づいて、磁気特性に及ぼす仕上焼鈍時の雰囲気の窒素分圧の影響について調査する下記の実験を行った。
C:0.0023mass%、Si:3.3mass%、Mn:0.2mass%、P:0.01mass%、S:0.0017mass%、Al:0.003mass%、N:0.0031mass%、Ti:0.0012mass%、Nb:0.0010mass%およびO:0.0024mass%を含有し、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た後、鋳造して鋼塊とし、熱間圧延して板厚1.9mmの熱延板とし、1000℃×30secの熱延板焼鈍を施した後、酸洗し、冷間圧延して板厚0.25mmの冷延板とし、1050℃×10secの仕上焼鈍(露点:-45℃)を施し、製品板とした。この際、仕上焼鈍に使用する水素と窒素の混合雰囲気中の窒素含有量を0~100vol%の範囲で種々に変化させた。
次いで、上記製品板の圧延方向(L方向)および圧延直角方向(C方向)から幅:30mm×長さ:180mmのLおよびC方向試験片を採取し、エプスタイン試験にてL+C方向の鉄損W15/50を測定した。
さらに、より鉄損を低減するため、鉄損に及ぼす仕上焼鈍時の雰囲気の露点の影響を調査する下記の実験を行った。
C:0.0027mass%、Si:3.6mass%、Mn:0.5mass%、P:0.01mass%、S:0.0019mass%、Al:0.003mass%、N:0.0029mass%、Ti:0.0011mass%、Nb:0.0012mass%およびO:0.0029mass%を含有し、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た後、鋳造して鋼塊とし、熱間圧延して板厚1.8mmの熱延板とし、950℃×30secの熱延板焼鈍を施した後、酸洗し、冷間圧延して板厚0.20mmの冷延板とし、1050℃×10secの仕上焼鈍を施し、製品板とした。この際、仕上焼鈍における雰囲気の露点を、30℃~-60℃の範囲で種々に変化させた。
次いで、上記製品板の圧延方向(L方向)および圧延直角方向(C方向)から幅:30mm×長さ:180mmの試験片を採取し、エプスタイン試験にてL+C方向の鉄損W15/50を測定した。
さらに、上記<実験3>で得た冷延板(板厚:0.20mm)を用いて、鉄損に及ぼす仕上焼鈍の均熱温度の影響を調査するため、均熱温度を900~1100℃の範囲で種々に変化させて製品板とする実験を行った。この際、上記仕上焼鈍における雰囲気は、100%N2雰囲気(露点:-50℃)と100%H2雰囲気(露点:-50℃)の2水準とした。
次いで、上記製品板の圧延方向(L方向)および圧延直角方向(C方向)から幅:30mm×長さ:180mmの試験片を採取し、エプスタイン試験にてL+C方向の鉄損W15/50を測定した。
因みに、<実験4>に用いた素材のAlNとSi3N4を完全固溶させるために必要な温度を上記(1)式から求めると、989℃であり、図6の結果とよく整合していることがわかる。
本発明は、上記の新規な知見に基づき開発したものである。
C:0.0050mass%以下
Cは、製品板中に残留していると、炭化物を形成して磁気時効を起こし、鉄損特性を劣化させる有害元素である。特に、Cが0.0050mass%を超えると、上記磁気時効による鉄損増加が顕著になる。よって、本発明はC: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低減する観点から、0.0001mass%程度とするのが好ましい。
Siは、鋼の固有抵抗を高め、鉄損を低減する元素であり、また、固溶強化により鋼の強度を高める効果があるため、1.0mass%以上含有させる。一方、6.5mass%を超えると、スラブ割れを起こしたり、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2.0~6.0mass%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効な元素であり、また、硫化物を形成して熱間脆性を改善する効果があるため、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、製鋼工程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。
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。よって、Sの上限は0.0050mass%とする。好ましくは0.0030mass%以下である。
Alは、0.01mass%を超えて含有すると、仕上焼鈍後の集合組織がランダム化し、磁気特性に好ましい{100}方位の集合組織の発達が不十分となるため、0.01mass%以下に制限する。好ましくは、0.005mass%以下、より好ましくは0.002mass%以下である。
Nは、窒化物を形成して磁気特性を劣化させる元素であるため、0.0050mass%以下に制限する。好ましくは0.0040mass%以下である。
TiおよびNbは、微細析出物を形成して析出し、鉄損を増加させる有害元素である。いずれも0.0030mass%を超えると、上記の悪影響が顕著になるため、それぞれ上限を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。
P:0.03~0.20mass%
Pは、粒界に偏析し、再結晶後の集合組織を改善する効果がある。上記効果を得るためには0.03mass%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、上記効果が飽和するだけでなく、冷間圧延性の低下をもたらすので、上限は0.20mass%とする。よって、Pを添加する場合は0.03~0.20mass%の範囲とするのが好ましい。より好ましくは0.05~0.10mass%の範囲である。
SnおよびSbは、再結晶集合組織を改善し、磁束密度や鉄損特性を改善する効果がある。上記効果を得るためには、それぞれ0.005mass%以上添加する必要がある。一方、0.20mass%を超えて添加しても、上記効果が飽和する。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。より好ましくは、それぞれ0.01~0.1mass%の範囲である。
Ca、MgおよびREM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0.0005mass%以上の添加が必要である。一方、0.020mass%以上添加しても、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。より好ましくは、合計で0.001~0.01mass%の範囲である。
Cu,NiおよびCrは、鋼の固有抵抗を高めて鉄損を低減し、かつ、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だけでなく、鉄損の増加を招く。よって、上記元素を添加する場合は、合計で0.01~1.0mass%の範囲とすることが好ましい。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、熱間圧延して熱延板とし、必要に応じて該熱延板に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、仕上焼鈍を施し、必要に応じて絶縁被膜を塗布して製品板とする一連の工程で製造することができる。
具体的には、仕上焼鈍における雰囲気ガスは、仕上焼鈍時に窒素を低減する観点から、N2の含有量が50vol%以下のN2、H2および希ガスのうちから選ばれる1種または2種以上の混合ガス(ただし、H2O等の不純物を除く)であることが必要である。例えば、vol%比でH2:N2=80:20の雰囲気とするのが好ましい。また、雰囲気ガスの露点は、鋼板表面の酸化を防止する観点から、-20℃以下とする必要がある。好ましくは、N2含有量は40vol%以下、露点は-40℃以下である。なお、仕上焼鈍の雰囲気を制御する区間は、加熱および均熱の区間とする。
を満たすことが必要である。
ここで、上記(1)式の左辺は、AlNやSi3N4の窒化物を完全固溶させるために必要な温度(℃)を表す式であり、均熱温度Tが上記(1)式の左辺の値を下回ると、仕上焼鈍時に微細に析出している窒化物を分解して鋼中に固溶させることができなくなる。一方、均熱温度Tが1200℃を超えると、熱エネルギーコストが増大したり、焼鈍設備の熱負荷が大きくなり過ぎ、設備のメンテナンス上、好ましくない。好ましくは、下記(2)式;
の温度範囲である。
Claims (5)
- C:0.0050mass%以下、Si:1.0~6.5mass%、Mn:0.05~2.0mass%、S:0.0050mass%以下、Al:0.01mass%以下、N:0.0050mass%以下、Ti:0.0030mass%以下、Nb:0.0030mass%以下およびO:0.0050mass%以下、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鋼スラブを熱間圧延し、1回もしくは中間焼鈍を挟む2回以上の冷間圧延して最終板厚とした後、仕上焼鈍を施す無方向性電磁鋼板の製造方法において、
上記仕上焼鈍の均熱温度T(℃)が下記(1)式を満たし、さらに、
上記仕上焼鈍の雰囲気は、N2、H2および希ガスから選ばれる1種または2種以上を含有し、かつ、N2含有量が50vol%以下の混合ガスとし、上記雰囲気の露点を-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。
記
- 上記鋼スラブは、上記成分組成に加えてさらに、P:0.03~0.20mass%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の製造方法。
- 上記鋼スラブは、上記成分組成に加えてさらに、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または2に記載の無方向性電磁鋼板の製造方法。
- 上記鋼スラブは、上記成分組成に加えてさらに、Ca、MgおよびREMのうちから選ばれる1種または2種以上を合計で0.0005~0.020mass%含有することを特徴とする請求項1~3のいずれか1項に記載の無方向性電磁鋼板の製造方法。
- 上記鋼スラブは、上記成分組成に加えてさらに、Cu、NiおよびCrのうちから選ばれる1種または2種以上を合計で0.01~1.0mass%含有することを特徴とする請求項1~4のいずれか1項に記載の無方向性電磁鋼板の製造方法。
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| JPWO2023079922A1 (ja) * | 2021-11-02 | 2023-05-11 |
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- 2019-07-04 WO PCT/JP2019/026617 patent/WO2020090156A1/ja not_active Ceased
- 2019-07-04 JP JP2019554425A patent/JP6950748B2/ja active Active
- 2019-07-04 EP EP19879584.1A patent/EP3875613A4/en active Pending
- 2019-07-04 MX MX2021004977A patent/MX2021004977A/es unknown
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- 2019-07-04 BR BR112021006645-4A patent/BR112021006645B1/pt active IP Right Grant
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| JP7529131B2 (ja) | 2021-11-02 | 2024-08-06 | Jfeスチール株式会社 | 無方向性電磁鋼板の仕上焼鈍設備と無方向性電磁鋼板の仕上焼鈍方法およびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| MX2021004977A (es) | 2021-06-15 |
| BR112021006645A2 (pt) | 2021-07-13 |
| KR102510146B1 (ko) | 2023-03-14 |
| CN112930408A (zh) | 2021-06-08 |
| TW202018100A (zh) | 2020-05-16 |
| CA3116570C (en) | 2023-01-10 |
| JPWO2020090156A1 (ja) | 2021-02-15 |
| BR112021006645B1 (pt) | 2023-12-05 |
| TWI738061B (zh) | 2021-09-01 |
| EP3875613A4 (en) | 2021-11-24 |
| US20210388456A1 (en) | 2021-12-16 |
| EP3875613A1 (en) | 2021-09-08 |
| JP6950748B2 (ja) | 2021-10-13 |
| KR20210053979A (ko) | 2021-05-12 |
| CA3116570A1 (en) | 2020-05-07 |
| CN112930408B (zh) | 2023-01-17 |
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