WO2013137092A1 - 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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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
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- 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
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- 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
- C21D8/1261—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 following hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—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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- 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
Definitions
- the present invention relates to a method for producing a non-oriented electrical steel sheet, and specifically to a method for producing a non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss.
- Non-oriented electrical steel sheets are widely used as core materials for electrical equipment, and in order to achieve high efficiency and downsizing of electrical equipment, the quality of non-oriented electrical steel sheets is improved, that is, high magnetic flux density. And low iron loss are indispensable.
- the magnetic flux density is increased by increasing the crystal grain size before cold rolling and optimizing the cold rolling reduction ratio.
- the reason is that in a rotating machine and a small transformer, the copper loss caused by the current flowing through the coil wound around the iron core cannot be ignored.
- the same magnetic flux density is used to lower the excitation. This is because it is effective to use a high magnetic flux density material that can be achieved by an electric current.
- Patent Document 1 discloses that a steel containing 0.1 to 3.5% of Si has a Sn content of 0.03.
- a technique for reducing iron loss by adding in a range of ⁇ 0.40% discloses that magnetically desirable ⁇ 100 ⁇ and ⁇ 110 ⁇ aggregates by adding Sn and Cu in combination.
- a technique for obtaining a non-oriented electrical steel sheet with low iron loss and high magnetic flux density by developing a structure and suppressing an undesired ⁇ 111 ⁇ texture is disclosed.
- JP 55-158252 A Japanese Patent Laid-Open No. 62-180014
- the present invention has been made in view of the above-mentioned problems in the prior art, and an object thereof is to propose a method for producing a non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss.
- the inventors have intensively studied to solve the above problems. As a result, when re-annealing (finish annealing) a cold-rolled sheet to which appropriate amounts of P and Ca are added, the heating rate at the time of heating is higher than that of the prior art, resulting in high magnetic flux density and low iron loss.
- the present invention has been developed based on the knowledge that a non-oriented electrical steel sheet can be obtained stably.
- the present invention has C: 0.005 mass% or less, Si: 4 mass% or less, Mn: 0.03 to 3 mass%, Al: 3 mass% or less, P: 0.03 to 0.2 mass%, S: 0.005 mass% or less and N: 0.005 mass% or less, and further Ca is 0.0005 to 0.01 mass% and the atomic ratio to S (Ca (mass%) / 40) / (S (mass%)) / 32) in the range of 0.5 to 3.5, with the balance being Fe and unavoidable impurities, hot-rolled, hot-rolled sheet annealed, cold-rolled, and at least up to 740 ° C
- the steel slab further includes one or two selected from Sn and Sb in the range of 0.003 to 0.5 mass% in addition to the above component composition. It is characterized by containing.
- a non-oriented electrical steel sheet having excellent magnetic properties can be stably provided, and this greatly contributes to high efficiency and downsizing of electrical equipment such as a rotating machine and a small transformer.
- the cold-rolled sheet was heated to 740 ° C. in a direct current heating furnace at two heating rates of 30 ° C./sec and 200 ° C./sec, and further heated to 1000 ° C. at 30 ° C./sec.
- the finish annealing (recrystallization annealing) which cools was given.
- the steel plate with P content of 0.35 mass% and 0.5 mass% broke during cold rolling, it could not proceed to the subsequent steps.
- the cold-rolled sheet was heated to 740 ° C. in a direct current heating furnace at two heating rates of 30 ° C./sec and 300 ° C./sec, and further heated to 1000 ° C. at 30 ° C./sec. After heating and holding for 10 seconds, the finish annealing (recrystallization annealing) which cools was given.
- the atomic ratio of Ca to S that is, ((Ca / 40) / (S / 32)) is in the range of 0.5 to 3.5, and the rate of temperature increase is 300 ° C./sec. It can be seen that good magnetic properties are obtained.
- the reason for this is that Ca has the effect of fixing S in steel and precipitating as CaS, so that the grain growth property during hot-rolled sheet annealing is improved, and the crystal grain size before cold rolling is increased.
- the ⁇ 111 ⁇ ⁇ 112> orientation which is the hard axis of magnetization in the recrystallized structure after hot rolling, decreases.
- the ⁇ 111 ⁇ ⁇ 112> orientation is further reduced by increasing the rate of temperature increase in the heating of finish annealing (recrystallization annealing).
- finish annealing finish annealing
- C 0.0025 mass%, Si: 2.5 mass%, Mn: 0.20 mass%, Al: 0.001 mass%, N: 0.0025 mass%, P: 0.10 mass%, S: 0.0020 mass% and Ca :
- a steel slab containing 0.003 mass% was reheated at 1100 ° C for 30 minutes, and then hot rolled to obtain a hot rolled sheet with a thickness of 1.8 mm, and subjected to hot rolling of 1000 ° C for 30 seconds. After that, a cold-rolled sheet having a thickness of 0.30 mm was obtained by one cold rolling. Thereafter, the cold-rolled sheet was heated to 740 ° C.
- C 0.005 mass% or less
- C is set to 0.005 mass% or less.
- Si 4 mass% or less Si is added to increase the specific resistance of steel and improve iron loss. However, if it exceeds 4 mass%, it is difficult to roll and manufacture. Therefore, in the present invention, the upper limit of Si is set to 4 mass%. Preferably, it is in the range of 1 to 4 mass%.
- Mn 0.03 to 3 mass%
- Mn is an element necessary for improving the hot workability, but if the amount is less than 0.03 mass%, the above effect cannot be obtained. On the other hand, addition exceeding 3 mass% causes a decrease in saturation magnetic flux density and an increase in raw material cost. Therefore, Mn is set to a range of 0.03 to 3 mass%. Preferably, it is in the range of 0.05 to 2 mass%.
- Al 3 mass% or less Al, like Si, is added to increase the specific resistance of steel and improve iron loss. However, the addition exceeding 3 mass% lowers the rollability. Therefore, in the present invention, the upper limit of Al is set to 3 mass%. Preferably it is 2 mass% or less. Note that Al does not have to be positively added.
- P 0.03-0.2 mass%
- P has the effect of increasing the ⁇ 100 ⁇ ⁇ 012> orientation, which is the easy axis of magnetization, and improving magnetic properties, and is an essential additive element in the present invention. As shown in FIGS. 1 and 2, the above effect can be obtained by adding 0.03 mass% or more. However, addition exceeding 0.2 mass% inhibits cold rolling properties and makes it difficult to roll and manufacture. Therefore, P is set in the range of 0.03 to 0.2 mass%. Preferably, it is in the range of 0.05 to 0.15 mass%.
- S 0.005 mass% or less
- N 0.005 mass% or less
- S and N are inevitable impurities mixed in the steel, and if contained in excess of 0.0050 mass%, the magnetic properties are likely to be deteriorated. Therefore, each is limited to 0.0050 mass% or less.
- S is 0.004 mass% or less
- N is 0.004 mass% or less.
- Ca 0.0005 to 0.01 mass% and (Ca (mass%) / 40) / (S (mass%) / 32): 0.5 to 3.5 Ca fixes S, promotes grain growth in hot-rolled sheet annealing, coarsens the crystal grain size before cold rolling, and reduces the ⁇ 111 ⁇ ⁇ 112> orientation in the recrystallized structure after cold rolling There is an effect to. If the addition amount of Ca is less than 0.0005 mass%, the above effect is not sufficient. On the other hand, addition of more than 0.01 mass% leads to excessive precipitation of CaS and increases the hysteresis loss, which is not preferable.
- the atomic ratio of Ca to S (Ca (mass%) / 40) / (S (mass%) / 32)) Needs to be added in the range of 0.5 to 3.5.
- the atomic ratio of Ca to S is less than 0.5, the above effect cannot be obtained sufficiently.
- the atomic ratio of Ca to S exceeds 3.5, the amount of precipitated CaS is excessive and hysteresis loss is reduced. On the contrary, the iron loss increases. Therefore, Ca needs to be added in an atomic ratio with respect to S in the range of 0.5 to 3.5. A range of 1 to 3 is preferable.
- the non-oriented electrical steel sheet according to the present invention further contains any one or two of Sn: 0.003-0.5 mass% and Sb: 0.003-0.5 mass% in addition to the above components. can do.
- Sn and Sb not only improve the texture and improve the magnetic flux density, but also prevent the deterioration of magnetic properties by suppressing the oxidation and nitridation of the steel sheet surface layer and the formation of surface layer fine grains accompanying it, etc. It has a preferable effect. In order to express the effect, it is preferable to contain 0.003 mass% or more of any one of Sn and Sb.
- the addition exceeding 0.5 mass% may inhibit the growth of crystal grains and may cause a decrease in magnetic properties.
- the content when adding Sn and Sb, it is preferable to set the content in the range of 0.003 to 0.5 mass%. More preferable addition amounts are in the range of 0.005 to 0.4 mass%, respectively.
- the remainder other than the said component in the non-oriented electrical steel sheet of this invention is Fe and an unavoidable impurity.
- the non-oriented electrical steel sheet of the present invention is obtained by melting a steel adjusted to the above-mentioned composition suitable for the present invention by a refining process using a converter, electric furnace, vacuum degassing equipment, etc.
- steel slab is made by the lump-slab rolling method, then the steel slab is hot-rolled to form a hot-rolled sheet, subjected to hot-rolled sheet annealing, cold-rolled, and recrystallized annealing (finish annealing) It can be produced by a known method.
- the manufacturing conditions up to the hot rolling process including hot-rolled sheet annealing may be in accordance with conventionally known conditions and are not particularly limited. Therefore, the manufacturing conditions after the cold rolling process will be described below.
- Cold rolling from the hot-rolled sheet after the hot-rolled sheet annealing to the cold-rolled sheet having the final thickness may employ either one cold rolling or two or more cold rollings sandwiching the intermediate annealing. .
- the rolling reduction may be the same as the manufacturing process of a normal non-oriented electrical steel sheet.
- the cold-rolled sheet is then subjected to finish annealing (recrystallization annealing), but the production method of the present invention requires rapid heating up to the recrystallization temperature range as the heating condition in the finish annealing. Specifically, it is necessary to rapidly heat from room temperature to 740 ° C. at an average heating rate of 100 ° C./sec or more. As shown in FIGS. 5 and 6, rapid heating at 100 ° C./sec or more suppresses recrystallization of ⁇ 111 ⁇ grains and promotes recrystallization of ⁇ 110 ⁇ grains and ⁇ 100 ⁇ grains. This is because the magnetic properties are improved.
- the heating rate from room temperature to 740 ° C. is 150 ° C./sec or more.
- the end point temperature for rapid heating may be at least 740 ° C., which is the temperature at which recrystallization is completed, and therefore may be a temperature exceeding 740 ° C.
- the higher the end point temperature the higher the equipment cost and running cost required for heating, which is not preferable in terms of manufacturing cost. Therefore, in the present invention, the end point temperature for rapid heating is at least 740 ° C.
- the cold-rolled sheet that has been recrystallized by rapid heating is then subjected to soaking annealing at a higher temperature in order to grow into crystal grains of a predetermined size.
- the heating rate, soaking temperature, and soaking time at this time may be performed in accordance with the annealing conditions performed in a normal non-oriented electrical steel sheet, and are not particularly limited.
- the heating rate from 740 ° C. to the soaking temperature is 1 to 50 ° C./sec
- the soaking temperature is 800 to 1100 ° C.
- the soaking time is 5 to 120 sec.
- a more preferable soaking temperature is in the range of 900 to 1050 ° C.
- the non-oriented electrical steel sheet produced by satisfying all the conditions of the present invention has excellent magnetic properties with high magnetic flux density and low iron loss.
- No. No. 5 is P
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Abstract
Description
C:0.0025mass%、Si:3.0mass%、Mn:0.10mass%、Al:0.001mass%、N:0.0019mass%、S:0.0020mass%およびCa:0.0025mass%を含有し、かつ、P:0.01~0.5mass%の範囲で変化させた鋼スラブを、1100℃×30分の再加熱後、熱間圧延して板厚2.0mmの熱延板とし、1000℃×30秒の熱延板焼鈍を施した後、1回の冷間圧延で板厚0.35mmの冷延板とした。その後、上記冷延板を、直接通電加熱炉で昇温速度を30℃/secと200℃/secの2水準に変えて740℃まで加熱した後、さらに、30℃/secで1000℃まで昇温して10秒間保持した後、冷却する仕上焼鈍(再結晶焼鈍)を施した。なお、P含有量が0.35mass%と0.5mass%の鋼板は、冷間圧延時に破断したため、以降の工程へは進めなかった。
C:0.0028mass%、Si:3.3mass%、Mn:0.50mass%、Al:0.004mass%、N:0.0022mass%、P:0.08mass%およびS:0.0024mass%を含有し、かつ、Caの添加量を0.0001~0.015mass%の範囲で変化させた鋼スラブを、1100℃×30分の再加熱後、熱間圧延して板厚1.8mmの熱延板とし、1000℃×30秒の熱延板焼鈍を施した後、1回の冷間圧延で板厚0.25mmの冷延板とした。その後、上記冷延板を、直接通電加熱炉で昇温速度を30℃/secと300℃/secの2水準に変えて740℃まで加熱した後、さらに、30℃/secで1000℃まで昇温して10秒間保持した後、冷却する仕上焼鈍(再結晶焼鈍)を施した。
C:0.0025mass%、Si:2.5mass%、Mn:0.20mass%、Al:0.001mass%、N:0.0025mass%、P:0.10mass%、S:0.0020mass%およびCa:0.003mass%を含有する鋼スラブを、1100℃×30分の再加熱後、熱間圧延して板厚1.8mmの熱延板とし、1000℃×30秒の熱延板焼鈍を施した後、1回の冷間圧延で板厚0.30mmの冷延板とした。その後、上記冷延板を、直接通電加熱炉で昇温速度を30~300℃/secの範囲で種々に変化させて740℃まで加熱した後、さらに、30℃/secで1020℃まで昇温して10秒間保持した後、冷却する仕上焼鈍(再結晶焼鈍)を施した。
本発明は、上記の知見に基いて開発したものである。
C:0.005mass%以下
Cは、0.005mass%を超えて含有すると、磁気時効を起こして鉄損特性の劣化を招く。よって、Cは0.005mass%以下とする。好ましくは0.003mass%以下である。
Siは、鋼の固有抵抗を高め、鉄損を改善するために添加するが、4mass%を超えて添加すると、圧延して製造することが困難となる。よって、本発明ではSiの上限を4mass%とする。好ましくは、1~4mass%の範囲である。
Mnは、熱間加工性を改善するために必要な元素であるが、0.03mass%未満では上記効果が得られない。一方、3mass%を超える添加は、飽和磁束密度の低下や原料コストの上昇を招く。よって、Mnは0.03~3mass%の範囲とする。好ましくは0.05~2mass%の範囲である。
Alは、Siと同様に、鋼の固有抵抗を高め、鉄損を改善するために添加されるが、3mass%を超える添加は、圧延性を低下させる。よって、本発明では、Alの上限を3mass%とする。好ましくは2mass%以下である。なお、Alは、積極的に添加しなくてもよい。
Pは、磁化容易軸である{100}<012>方位を増加し、磁気特性を向上する効果があり、本発明においては必須の添加元素である。上記効果は、図1,2に示したように、0.03mass%以上の添加で得られる。しかし、0.2mass%を超える添加は、冷間圧延性を阻害し、圧延して製造することを困難とする。よって、Pは0.03~0.2mass%の範囲とする。好ましくは、0.05~0.15mass%の範囲である。
SおよびNは、鋼中に混入してくる不可避的不純物であり、0.0050mass%を超えて含有すると、磁気特性の低下を招くようになるので、それぞれ0.0050mass%以下に制限する。好ましくはS:0.004mass%以下、N:0.004mass%以下である。
Caは、Sを固定し、熱延板焼鈍での粒成長を促進し、冷延前の結晶粒径を粗大化して、冷間圧延後の再結晶組織における{111}<112>方位を低減する効果がある。Caの添加量が0.0005mass%未満では、上記効果が十分ではなく、一方、0.01mass%を超える添加は、CaSの過析出を招き、ヒステリシス損が増加するため好ましくない。
SnおよびSbは、集合組織を改善して磁束密度を向上させるだけでなく、鋼板表層の酸化や窒化およびそれに伴う表層微細粒の生成を抑制することによって、磁気特性の低下を防止する等、種々の好ましい作用効果を有する。掛かる効果を発現させるためには、SnおよびSbのうちのいずれか1種以上を0.003mass%以上含有させることが好ましい。一方、0.5mass%を超える添加は、結晶粒の成長を阻害し、却って磁気特性の低下を招くおそれがある。よって、SnおよびSbを添加する場合は、それぞれ0.003~0.5mass%の範囲とするのが好ましい。より好ましい添加量は、それぞれ0.005~0.4mass%の範囲である。
なお、本発明の無方向性電磁鋼板における上記成分以外の残部は、Feおよび不可避的不純物である。
本発明の無方向性電磁鋼板は、本発明に適合する上記成分組成に調整した鋼を、転炉や電気炉、真空脱ガス設備等を用いた精錬プロセスで溶製し、連続鋳造法あるいは造塊-分塊圧延法で鋼スラブとした後、上記鋼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、冷間圧延し、再結晶焼鈍(仕上焼鈍)する通常公知の方法で製造することができる。上記製造工程のうち、熱延板焼鈍を含む熱間圧延工程までの製造条件は、従来公知の条件に従えばよく、特に制限はない。よって、以下、冷間圧延工程以降の製造条件について説明する。
次いで、表2に記載したように、直接通電加熱炉で、昇温速度と急速加熱終点温度を種々に変えて加熱し、その後、同じく表2に示した均熱温度まで30℃/secで加熱し、10秒間保持した後、冷却する仕上焼鈍(再結晶焼鈍)を施して冷延焼鈍板とした。
斯くして得られた冷延焼鈍板から、L:180mm×C:30mmのL方向サンプルおよびC:180mm×L:30mmのC方向サンプルを切り出し、エプスタイン試験で磁気特性(磁束密度B50、鉄損W15/50)を測定し、その結果を表2に併記した。
Claims (2)
- C:0.005mass%以下、Si:4mass%以下、Mn:0.03~3mass%、Al:3mass%以下、P:0.03~0.2mass%、S:0.005mass%以下およびN:0.005mass%以下を含有し、さらに、Caを0.0005~0.01mass%かつSに対する原子比(Ca(mass%)/40)/(S(mass%)/32)で0.5~3.5の範囲で含有し、残部がFeおよび不可避的不純物からなる鋼スラブを熱間圧延し、熱延板焼鈍し、冷間圧延した後、少なくとも740℃までを平均昇温速度100℃/sec以上で加熱する再結晶焼鈍を施す無方向性電磁鋼板の製造方法。
- 前記鋼スラブは、前記成分組成に加えてさらに、SnおよびSbのうちから選ばれる1種または2種をそれぞれ0.003~0.5mass%の範囲で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。
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Also Published As
Publication number | Publication date |
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EP2826872A1 (en) | 2015-01-21 |
TWI516612B (zh) | 2016-01-11 |
US20150059929A1 (en) | 2015-03-05 |
KR20140113739A (ko) | 2014-09-24 |
KR101591222B1 (ko) | 2016-02-02 |
EP2826872B1 (en) | 2018-05-16 |
EP2826872A4 (en) | 2015-05-06 |
TW201402834A (zh) | 2014-01-16 |
CN104136637B (zh) | 2017-05-31 |
JP2013189693A (ja) | 2013-09-26 |
JP5892327B2 (ja) | 2016-03-23 |
MX357847B (es) | 2018-07-26 |
US9920393B2 (en) | 2018-03-20 |
CN104136637A (zh) | 2014-11-05 |
MX2014010846A (es) | 2014-12-10 |
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