JPH0620593B2 - Manufacturing method of cast slab for non-oriented electrical steel sheet - Google Patents
Manufacturing method of cast slab for non-oriented electrical steel sheetInfo
- Publication number
- JPH0620593B2 JPH0620593B2 JP1289389A JP1289389A JPH0620593B2 JP H0620593 B2 JPH0620593 B2 JP H0620593B2 JP 1289389 A JP1289389 A JP 1289389A JP 1289389 A JP1289389 A JP 1289389A JP H0620593 B2 JPH0620593 B2 JP H0620593B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- cast
- primary
- equiaxed
- columnar crystals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、薄板に圧延したときにリジングの発生がない
圧延性に優れた無方向性電磁鋼板用の鋳片を高速で連続
鋳造する方法に関する。The present invention relates to a method of continuously casting a slab for a non-oriented electrical steel sheet, which is excellent in rollability without ridging when rolled into a thin plate, at high speed. Regarding
多量のけい素を含有する溶鋼から連続鋳造法で電磁鋼板
溶鋳片を製造するとき、中心部に偏析や柱状晶のない組
織を製造するため、モールドから送り出された鋳片の内
部に残留している未凝固の溶融金属に対して電磁攪拌力
を作用させ、且つ低速で鋳造している。このようにして
得られた鋳片は、等軸晶を主体とする組織をもってお
り、リジング等を発生することなく薄板に圧延される。When a molten steel containing a large amount of silicon is used to produce a molten steel sheet for electrical steel sheets by the continuous casting method, a structure without segregation or columnar crystals is produced in the center, so that it remains inside the molten steel sheet sent out from the mold. An electromagnetic stirring force is applied to the unsolidified molten metal that is present, and casting is performed at a low speed. The slab thus obtained has a structure mainly composed of equiaxed crystals and is rolled into a thin plate without causing ridging or the like.
従来の湾曲型連続鋳造法により多量のけい素を含有する
溶鋼から無方向性電磁鋼板用鋳片を製造する場合、第４
図に示すようにタンディッシュ等の中間容器からモール
ド51に注湯された溶鋼は、モールド51の器壁を介した抜
熱によって凝固シェルを形成し、モールド51から鋳片52
として引き抜かれる。引き抜かれた鋳片52の内部には、
溶鋼が未だ溶融状態にある未凝固部53が存在する。この
未凝固部53に一次電磁攪拌機54から攪拌力を加えると
き、一次柱状晶の生成が抑制され、溶融金属から等軸晶
が析出する割合が増加する。In the case of producing a non-oriented electrical steel sheet slab from molten steel containing a large amount of silicon by the conventional curved continuous casting method,
As shown in the figure, the molten steel poured into the mold 51 from an intermediate container such as a tundish forms a solidified shell by heat removal through the vessel wall of the mold 51, and the slab 52 is cast from the mold 51.
Is pulled out as. Inside the pulled out slab 52,
There is an unsolidified portion 53 in which molten steel is still in a molten state. When a stirring force is applied to the unsolidified portion 53 from the primary electromagnetic stirrer 54, the generation of primary columnar crystals is suppressed, and the proportion of equiaxed crystals precipitated from the molten metal increases.
鋳片52を鋳造している間に、未凝固部53にある溶融金属
の凝固が進行する。低速で鋳造した場合には、曲戻し点
57よりも上流の位置55で凝固が完了するため、第３図
(a)に示すように等軸晶62の比率が高くリジングの発生
しない鋳片が得られる。While casting the slab 52, solidification of the molten metal in the unsolidified portion 53 progresses. When casting at a low speed, the bending point
As the solidification is completed at the position 55 upstream of 57,
As shown in (a), a slab with a high proportion of equiaxed crystals 62 and no ridging is obtained.
しかし、低速で鋳造した場合、鋳造時間が長くなるた
め、溶鋼の温度降下が大きく、低温に起因してタンディ
シュノズルの絞り等のトラブルが発生し易くなる。ま
た、生産性低下等の問題もある。この問題を解決するた
め高速で鋳造すると、曲戻し点57よりも下流側の位置58
で凝固が完了することになる。この場合、第３図(b)に
示すように二次柱状晶64が大きく発達し、リジングが発
生する。However, when casting is performed at a low speed, the casting time becomes long, so that the temperature drop of the molten steel is large, and troubles such as throttling of the tundish nozzle easily occur due to the low temperature. In addition, there is a problem such as a decrease in productivity. When casting at a high speed to solve this problem, the position 58 downstream of the turnback point 57
Will complete the coagulation. In this case, as shown in FIG. 3 (b), the secondary columnar crystals 64 greatly develop and ridging occurs.
そこで、本発明は、多段階にわたって未凝固部に加えら
れる電磁攪拌力を調整して、分断された柱状晶が鋳片の
断面に占める割合を制御することにより、等軸晶率が低
い状態においても加工性に優れた鋳片を高速で連続鋳造
することを目的とする。Therefore, in the present invention, by adjusting the electromagnetic stirring force applied to the unsolidified portion over multiple stages to control the proportion of the divided columnar crystals in the cross section of the slab, in the state where the equiaxed crystal ratio is low. Also aims to continuously cast slabs with excellent workability at high speed.
本発明は、その目的を達成するために、連続鋳造機のモ
ールドから引き抜かれた鋳片の内部に存在する未凝固部
の溶融金属を一次電磁攪拌機及び二次電磁攪拌機で攪拌
する際、前記鋳片の搬送方向に関して曲戻し点よりも下
流側で前記未凝固部の凝固を完了させ、前記曲戻し点よ
りも上流側の前記未凝固部に対して前記二次電磁攪拌機
による攪拌力を加え、且つ鋳片の表層部に形成される柱
状晶及び中心部に形成される二次柱状晶の層厚を次式
(1)及び(2)で特定される関係に維持することを特徴とす
る。The present invention, in order to achieve the object, when agitating the molten metal of the unsolidified portion present inside the cast strip drawn from the mold of the continuous casting machine with the primary electromagnetic stirrer and the secondary electromagnetic stirrer, the casting Complete the solidification of the unsolidified portion on the downstream side of the bending back point with respect to the transport direction of the piece, and apply a stirring force by the secondary electromagnetic stirrer to the unsolidified portion on the upstream side of the bending back point, In addition, the layer thickness of the columnar crystals formed in the surface layer of the slab and the secondary columnar crystals formed in the center is calculated by the following formula.
It is characterized by maintaining the relationship specified in (1) and (2).
ｌ0／Ｌ≧60％ ・・・・(1) （ｌ1＋ｌ2）／Ｌ≧40％ ・・・・(2) ここで、Ｌ：鋳片の肉厚 ｌ0：鋳片厚さ方向の上側の等軸晶から下側の等軸晶ま
での距離 ｌ1：上側の等軸晶の層厚 ｌ2：下側の等軸晶の層厚 〔作用〕 以下、図面を参照しながら、本発明の特徴を、その作用
と共に具体的に説明する。l 0 / L ≧ 60% ・ ・ ・ ・ (1) (l 1 + l 2 ) / L ≧ 40% ・ ・ ・ ・ (2) where L: wall thickness of the cast l 0 : thickness direction of the cast From the upper equiaxed crystal to the lower equiaxed crystal l 1 : The upper equiaxed layer thickness l 2 : The lower equiaxed layer thickness [Operation] Hereinafter, referring to the drawings, The features of the present invention will be specifically described together with the operation thereof.
モールドに注湯された溶鋼を電磁攪拌することなく冷却
・凝固した場合、第５図(a)に示すように周辺部に一次
柱状晶61が大きく発達した組織をもつ鋳片となる。この
一次柱状晶61は、内部に生成した等軸晶62に比較して加
工性に劣る。そして、この鋳片を圧延するとき、圧延時
の剪断応力は、鋳片の厚み方向に関して、同図(b)の曲
線63で示すように、鋳片の表層部では剪断応力が大き
く、中心部に行くに従って剪断応力が小さくなる分布を
もつ。そのため、鋳片の表層部ａにある一次柱状晶61
は、大きな剪断応力によって破壊される。また、中心部
ｂの等軸晶は、加工性に優れているため、小さな剪断応
力でも欠陥を発生することがない。しかし、表層部ａと
中心部ｂの間の境界部ｃでは、加工性の低い一次柱状晶
61からなる組織であり、しかも加工時に加わる剪断応力
が小さい。そのため、境界部ｃの一次柱状晶61は、圧延
によって破壊されずに残留する。これが、圧延された板
材に、リジングを発生させる原因である。When the molten steel poured into the mold is cooled and solidified without electromagnetic stirring, it becomes a slab having a structure in which primary columnar crystals 61 are greatly developed in the peripheral portion as shown in FIG. 5 (a). This primary columnar crystal 61 is inferior in workability to the equiaxed crystal 62 generated inside. Then, when rolling this slab, the shearing stress during rolling, with respect to the thickness direction of the slab, as shown by the curve 63 in the same figure (b), the shearing stress is large in the surface layer portion of the slab, the central portion. There is a distribution in which the shear stress decreases as Therefore, the primary columnar crystals 61 on the surface layer a of the cast slab are
Are destroyed by large shear stresses. Further, the equiaxed crystal of the central portion b is excellent in workability, so that no defect occurs even with a small shear stress. However, at the boundary portion c between the surface layer portion a and the central portion b, the primary columnar crystal with low workability is
The structure consists of 61, and the shear stress applied during processing is small. Therefore, the primary columnar crystals 61 of the boundary portion c remain without being broken by rolling. This is the cause of ridging of the rolled sheet material.
そこで、本発明においては、多段階にわたって鋳片に加
える電磁攪拌を調整して、鋳片内部に形成される柱状晶
を制御することにより、リジング等の欠陥がない加工性
に優れた鋳片を製造する。Therefore, in the present invention, by adjusting the electromagnetic stirring applied to the slab over multiple stages to control the columnar crystals formed inside the slab, a slab excellent in workability without defects such as ridging can be obtained. To manufacture.
第３図は、この電磁攪拌の作用を模式的に説明するため
の図である。第４図のモールド51から引き抜かれた鋳片
52に対して一次電磁攪拌機54だけで電磁攪拌力を与えた
とき、第３図(b)に示すような二次柱状晶64が大きく形
成される。また、二次電磁攪拌機56だけで電磁攪拌力を
与えたとき、第３図(c)に示すような一次柱状晶61が大
きく形成される。すなわち、比較的厚い未凝固部53をも
つ鋳片52に電磁攪拌力を与えた場合、同図(b)に示すよ
うに鋳片52の周囲に形成される一次柱状晶61は、同図
(c)の場合に比較して薄肉になる。しかし、同図(b)に示
すように電磁攪拌力が与えられた未凝固部は、その後に
等軸晶62を析出した後、二次柱状晶64を鋳片52の中心部
に析出する。この二次柱状晶64の層厚ｔは、二次電磁攪
拌機56のみを作用させた同図(c)に比較して大きなもの
となっている。FIG. 3 is a diagram for schematically explaining the action of this electromagnetic stirring. A cast piece pulled out from the mold 51 shown in FIG.
When an electromagnetic stirring force is applied to 52 by only the primary electromagnetic stirrer 54, large secondary columnar crystals 64 as shown in FIG. 3 (b) are formed. When an electromagnetic stirring force is applied only by the secondary electromagnetic stirrer 56, large primary columnar crystals 61 as shown in FIG. 3 (c) are formed. That is, when an electromagnetic stirring force is applied to the cast piece 52 having a relatively thick unsolidified portion 53, the primary columnar crystals 61 formed around the cast piece 52 as shown in FIG.
It is thinner than in case (c). However, as shown in (b) of the figure, the unsolidified portion to which the electromagnetic stirring force is applied subsequently deposits equiaxed crystals 62 and then secondary columnar crystals 64 in the central portion of the slab 52. The layer thickness t of the secondary columnar crystals 64 is larger than that in the same figure (c) in which only the secondary electromagnetic stirrer 56 is operated.
これに対し、一次電磁攪拌機54及び二次電磁攪拌機56の
双方によって電磁攪拌力を鋳片52に与えた場合、同図
(d)に示すように一次柱状晶61及び二次柱状晶64が鋳片5
2の断面に占める割合が小さく、等軸晶62の割合が大き
な組織をもつ鋳片52が得られる。本発明は、この多段階
電磁攪拌を更に改良して、一次柱状晶61，等軸晶62及び
二次柱状晶64の関係を特定することにより、加工性の改
善を図ったものである。On the other hand, when electromagnetic stirring force is applied to the slab 52 by both the primary electromagnetic stirrer 54 and the secondary electromagnetic stirrer 56,
As shown in (d), the primary columnar crystals 61 and the secondary columnar crystals 64 are slabs 5
A slab 52 having a structure in which the proportion of the cross section of 2 is small and the proportion of equiaxed crystals 62 is large is obtained. The present invention is intended to improve the workability by further improving this multi-step electromagnetic stirring to specify the relationship between the primary columnar crystals 61, the equiaxed crystals 62 and the secondary columnar crystals 64.
第２図は、本発明に従って未凝固部を電磁攪拌すること
により得られた鋳片の組織を示す。この鋳片１は、表層
部にある薄い一次柱状晶２と、その内側の等軸晶３と、
中心部の二次柱状晶４からなる三重組織をもっている。
そして、鋳片１の肉厚をＬ，二次柱状晶４の層厚ｔ，上
側の等軸晶３の層厚をｌ１，下側の等軸晶３の層厚をｌ
２，上側等軸晶３から下側等軸晶３までの距離をｌ０と
するとき、次式の関係を維持させる。FIG. 2 shows the structure of a cast piece obtained by electromagnetically stirring the unsolidified portion according to the present invention. This cast slab 1 comprises a thin primary columnar crystal 2 on the surface layer, an equiaxed crystal 3 inside the slab,
It has a triple structure composed of secondary columnar crystals 4 in the central portion.
Then, the thickness of the cast slab 1 is L, the layer thickness t of the secondary columnar crystal 4, the layer thickness of the upper equiaxed crystal 3 is l 1 , and the layer thickness of the lower equiaxed crystal 3 is l.
2 , when the distance from the upper equiaxed crystal 3 to the lower equiaxed crystal 3 is set to l 0 , the relationship of the following equation is maintained.
ｌ0／Ｌ≧60％ ・・・・(1) （ｌ1＋ｌ2）／Ｌ≧40％ ・・・・(2) 式(1)は、鋳片の表層に形成される一次柱状晶61の厚み
が、鋳片の厚みに対して40％未満であることを示してい
る。たとえば二次電磁攪拌機のみで未凝固部を攪拌した
場合、第３図(c)に示すようにｌ0／Ｌが60％未満とな
り、リジングが発生する。l 0 / L ≧ 60% ・ ・ ・ ・ (1) (l 1 + l 2 ) / L ≧ 40% ・ ・ ・ ・ (2) Formula (1) is the primary columnar crystal formed on the surface layer of the cast slab 61 Indicates that the thickness is less than 40% of the thickness of the cast slab. For example, when the uncoagulated portion is stirred only by the secondary electromagnetic stirrer, l 0 / L becomes less than 60% as shown in FIG. 3 (c), and ridging occurs.
また、式(2)は、鋳片の中心部に形成される等軸晶３の
厚みの和が鋳片の厚みに対して40％以上であることを示
している。たとえば、ｌ0／Ｌ≧60％を満足させても、
式(2)が満足されていない場合、第３図(b)に示すように
中心部にある二次柱状晶64の層厚が大きくなり、リジン
グが発生し易い。Further, the expression (2) indicates that the sum of the thicknesses of the equiaxed crystals 3 formed in the central portion of the cast piece is 40% or more with respect to the thickness of the cast piece. For example, even if l 0 / L ≧ 60% is satisfied,
If the formula (2) is not satisfied, the layer thickness of the secondary columnar crystal 64 at the center becomes large as shown in FIG. 3 (b), and ridging is likely to occur.
第１図は、前述の式(1)及び(2)がリジング発生の有無に
与える影響を表したグラフである。図中、○印は、得ら
れた鋳片を圧延したとき、リジングのない板材が得られ
た条件を示す。他方、△印はリジングがみられるものの
合格品が得られた場合を示し、×は不合格品が得られた
場合を示す。すなわち、一次電磁攪拌機で鋳片内部の未
凝固部を攪拌した後、二次柱状晶が一旦発生しても、二
次電磁攪拌機の電磁攪拌によって分断され、微細な結晶
となっている。そのため、この二次柱状晶は、圧延時の
応力によって容易に加工され、リジング発生の原因とな
ることがない。FIG. 1 is a graph showing the influence of the above equations (1) and (2) on the occurrence of ridging. In the figure, the mark ◯ indicates the conditions under which a plate material without ridging was obtained when the obtained cast piece was rolled. On the other hand, the symbol Δ indicates the case where a passing product was obtained although ridging was observed, and the symbol X indicates the case where a rejecting product was obtained. That is, even if secondary columnar crystals are once generated after stirring the unsolidified portion inside the slab with the primary electromagnetic stirrer, they are divided by the magnetic stirring of the secondary electromagnetic stirrer to form fine crystals. Therefore, the secondary columnar crystals are easily processed by the stress during rolling and do not cause ridging.
本発明の方法によって、従来０．６ｍ／分以下であった
鋳造速度を、１．４ｍ／分程度まで上昇させることがで
きる。その結果、タンディッシュ内にある溶鋼の温度降
下が小さくなり、転炉吹止め温度も下げることができる
ので、転炉やタンディッシュにライニングされる耐火物
として耐火度の低い安価な材料を使用することが可能と
なる。By the method of the present invention, the casting speed, which was conventionally 0.6 m / min or less, can be increased to about 1.4 m / min. As a result, the temperature drop of the molten steel in the tundish can be reduced and the converter blowing temperature can also be lowered, so use an inexpensive material with low fire resistance as the refractory to be lined in the converter or tundish. It becomes possible.
けい素含有量１．８重量％で温度1550℃の溶鋼から鋳造
速度１．２ｍ／分で、板厚250mmのスラブを鋳造した。
このとき、モールドから引き抜かれた鋳片に対して、モ
ールドから４．１ｍの位置に配置された一次電磁攪拌機
で中心推力129mmFeの電磁力を加え、モールドから10.3
ｍの位置に配置された二次電磁攪拌機で中心推力117mmF
eの電磁力を加えた。得られた鋳片の組織を観察したと
ころ、各層の厚みは次の通りであった。A slab having a plate thickness of 250 mm was cast at a casting speed of 1.2 m / min from molten steel having a silicon content of 1.8% by weight and a temperature of 1550 ° C.
At this time, an electromagnetic force with a central thrust of 129 mmFe was applied to the cast slab pulled out from the mold by a primary electromagnetic stirrer located 4.1 m from the mold, and 10.3 mm from the mold.
Center thrust of 117 mmF with the secondary magnetic stirrer located at m
The electromagnetic force of e was applied. When the structure of the obtained cast piece was observed, the thickness of each layer was as follows.
Ｌ＝250mm，ｔ＝15mm，ｌ1＝15mm， ｌ2＝125mm，ｌ0＝155mm したがって、ｌ０／Ｌ＝62％，（l1+l2）＝56％と、な
り式(1)及び式(2)共に満足される。L = 250 mm, t = 15 mm, l 1 = 15 mm, l 2 = 125 mm, l 0 = 155 mm Therefore, l 0 / L = 62%, (l 1 + l 2 ) = 56% and the formula (1) and Both formula (2) are satisfied.
この鋳片を圧下率99％で板厚２．７mmの板材に圧延した
ところ、何らリジングの発生は見られなかった。When this cast slab was rolled into a plate material having a reduction ratio of 99% and a plate thickness of 2.7 mm, no ridging was observed.
以上に説明したように、本発明においては、鋳片の表層
部及び内部に形成される一次柱状晶及び二次柱状晶の割
合を特定することにより、圧延時にリジングの発生がな
い加工性に優れた鋳片が得られる。また、高速鋳造が可
能となることによって、タンディッシュ内にある溶鋼の
温度降下が小さくなり、転炉吹止め温度も下げることが
できるので、転炉，鋳鍋，タンディッシュ等のライニン
グコストを下げることもできる。As described above, in the present invention, by specifying the ratio of the primary columnar crystals and the secondary columnar crystals formed in the surface layer portion and the inside of the cast slab, excellent workability that does not occur ridging during rolling. Slab is obtained. In addition, since high-speed casting is possible, the temperature drop of molten steel in the tundish can be reduced, and the blowout temperature of the converter can be lowered, so the lining cost of the converter, pot, tundish, etc. can be reduced. You can also
第１図は本発明の効果を具体的に表したグラフであり、
第２図は本発明に従って得られた鋳片の組織を示し、第
３図は一次及び二次電磁攪拌機の有無が柱状晶の成長に
与える影響を表し、第４図は湾曲型連続鋳造機の概略を
示し、第５図は柱状晶が圧延時のリジング発生に与える
影響を説明するための図である。 1,52:鋳片、2,61:一次柱状晶 3,62:等軸晶、4,64:二次柱状晶 51:モールド、53:未凝固部 54:一次電磁攪拌機、55,58:凝固完了位置 56:二次電磁攪拌機、57:曲戻し点 Ｌ:鋳片１の肉厚 ｔ:二次柱状晶４の層厚 l1:上側等軸晶３の層厚 l2:下側等軸晶３の層厚 l0:上側等軸晶３から下側等軸晶３までの距離FIG. 1 is a graph specifically showing the effect of the present invention,
FIG. 2 shows the structure of the cast piece obtained according to the present invention, FIG. 3 shows the influence of the presence or absence of primary and secondary electromagnetic stirrers on the growth of columnar crystals, and FIG. FIG. 5 is a schematic diagram for explaining the influence of columnar crystals on the occurrence of ridging during rolling. 1,52: Slab, 2,61: Primary columnar crystal 3,62: Equiaxed crystal, 4,64: Secondary columnar crystal 51: Mold, 53: Unsolidified part 54: Primary magnetic stirrer, 55,58: Solidified Completion position 56: Secondary magnetic stirrer, 57: Curving point L: Wall thickness of slab 1 t: Layer thickness of secondary columnar crystal 4 l 1 : Upper layer equiaxed layer 3 l 2 : Lower equiaxed layer Layer thickness of crystal 3 l 0 : distance from upper equiaxed crystal 3 to lower equiaxed crystal 3
フロントページの続き (72)発明者 土田 宗弘 福岡県北九州市八幡東区枝光１丁目１番１ 号 新日本製鐵株式會社八幡製鐵所内 (56)参考文献 特開 昭54−99737（ＪＰ，Ａ) 特公 昭52−38490（ＪＰ，Ｂ２) 特公 昭57−15969（ＪＰ，Ｂ２)Front Page Continuation (72) Inventor Munehiro Tsuchida 1-1-1, Emitsu, Hachimanto-ku, Kitakyushu, Fukuoka Prefecture Nippon Steel & Co., Ltd. Hachiman Works (56) References JP-A-54-99737 (JP, A) ) JP-B-52-38490 (JP, B2) JP-B-57-15969 (JP, B2)
Claims (1)
片の内部に存在する未凝固部の溶融金属を一次電磁攪拌
機及び二次電磁攪拌機で攪拌する際、前記鋳片の搬送方
向に関して曲戻し点よりも下流側で前記未凝固部の凝固
を完了させ、前記曲戻し点よりも上流側の前記未凝固部
に対し前記一次及び二次電磁攪拌機による攪拌力を加
え、且つ鋳片内の外層部に形成される一次柱状晶及び中
心部に形成される二次柱状晶の層厚を次式(1)及び(2)で
特定される関係に維持することを特徴とする無方向性電
磁鋼板用鋳片の製造方法。 ｌ0／Ｌ≧60％ ・・・・(1) （ｌ1＋ｌ2）／Ｌ≧40％ ・・・・(2) ここで、Ｌ：鋳片の肉厚 ｌ0：鋳片厚さ方向の上側の等軸晶から下側の等軸晶ま
での距離 ｌ1：上側の等軸晶の層厚 ｌ2：下側の等軸晶の層厚1. When the molten metal in the unsolidified portion existing inside the cast strip drawn from the mold of the continuous casting machine is stirred by the primary electromagnetic stirrer and the secondary electromagnetic stirrer, it is bent back in the conveying direction of the cast strip. Complete the solidification of the unsolidified portion downstream of the point, the stirring force by the primary and secondary electromagnetic stirrer to the unsolidified portion upstream of the bending back point, and the outer layer in the slab Non-oriented electrical steel sheet characterized in that the layer thicknesses of the primary columnar crystals formed in the central part and the secondary columnar crystals formed in the central part are maintained in the relationship specified by the following formulas (1) and (2). Method for manufacturing cast slab. l 0 / L ≧ 60% ・ ・ ・ ・ (1) (l 1 + l 2 ) / L ≧ 40% ・ ・ ・ ・ (2) where L: wall thickness of the cast l 0 : thickness direction of the cast Distance from the upper equiaxed crystal to the lower equiaxed crystal l 1 : The upper equiaxed layer thickness l 2 : The lower equiaxed layer thickness
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1289389A JPH0620593B2 (en) | 1989-01-20 | 1989-01-20 | Manufacturing method of cast slab for non-oriented electrical steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1289389A JPH0620593B2 (en) | 1989-01-20 | 1989-01-20 | Manufacturing method of cast slab for non-oriented electrical steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02192853A JPH02192853A (en) | 1990-07-30 |
| JPH0620593B2 true JPH0620593B2 (en) | 1994-03-23 |
Family
ID=11818072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1289389A Expired - Lifetime JPH0620593B2 (en) | 1989-01-20 | 1989-01-20 | Manufacturing method of cast slab for non-oriented electrical steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0620593B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100561996B1 (en) | 2003-04-10 | 2006-03-20 | 신닛뽄세이테쯔 카부시키카이샤 | Method for manufacturing non-oriented electrical steel sheet having high magnetic flux density |
| JP5428780B2 (en) * | 2009-11-11 | 2014-02-26 | 新日鐵住金株式会社 | Steel continuous casting method |
| CN102443734B (en) * | 2010-09-30 | 2013-06-19 | 宝山钢铁股份有限公司 | Non-oriented electrical steel sheet free from corrugated defects and manufacturing method thereof |
| CN113857449B (en) * | 2021-09-14 | 2023-10-10 | 湖南华菱涟源钢铁有限公司 | Preparation method of oriented silicon steel casting blank and casting blank system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5238490B2 (en) | 2006-03-01 | 2013-07-17 | 東洋インキＳｃホールディングス株式会社 | Color filter and liquid crystal display device |
| JP5715969B2 (en) | 2012-01-24 | 2015-05-13 | 株式会社堀場エステック | Fluid resistance device |
-
1989
- 1989-01-20 JP JP1289389A patent/JPH0620593B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5238490B2 (en) | 2006-03-01 | 2013-07-17 | 東洋インキＳｃホールディングス株式会社 | Color filter and liquid crystal display device |
| JP5715969B2 (en) | 2012-01-24 | 2015-05-13 | 株式会社堀場エステック | Fluid resistance device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02192853A (en) | 1990-07-30 |
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