JPH08197195A - Method for continuous casting of molten steel and device therefor - Google Patents
Method for continuous casting of molten steel and device thereforInfo
- Publication number
- JPH08197195A JPH08197195A JP24175195A JP24175195A JPH08197195A JP H08197195 A JPH08197195 A JP H08197195A JP 24175195 A JP24175195 A JP 24175195A JP 24175195 A JP24175195 A JP 24175195A JP H08197195 A JPH08197195 A JP H08197195A
- Authority
- JP
- Japan
- Prior art keywords
- continuous casting
- molten steel
- casting mold
- solidified shell
- mold
- 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.)
- Pending
Links
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、鋼の連続鋳造に
おいて鋳型オシレーションに起因する表面欠陥の軽減さ
れた表面清浄に優れた鋳造鋳片を安定して製造しようと
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to stably produce a cast slab excellent in surface cleaning in which surface defects caused by mold oscillation are reduced in continuous casting of steel.
【0002】[0002]
【従来の技術】溶鋼の連続鋳造では、従来、鋳型オシレ
ーションに伴い発生する割れやノロかみ等を防止して表
面欠陥のない良好な鋳造鋳片を得るため、湯面と初期凝
固開始点を分離したタイプの連鋳機に高周波磁界を利用
した鋳造方法が試みられてきており、この点に関する文
献としては特公平3-69615 号公報、特開平1-284469号公
報あるいは特公昭64-5985 号公報等が参照される。2. Description of the Related Art Conventionally, in continuous casting of molten steel, in order to obtain a good cast slab with no surface defects by preventing cracks and slag biting that occur with mold oscillation, the molten metal surface and initial solidification starting point are A casting method using a high-frequency magnetic field in a separate type continuous casting machine has been tried, and literatures on this point are disclosed in Japanese Examined Patent Publication No. 3-69615, Japanese Unexamined Patent Publication No. 1-284469, and Japanese Examined Patent Publication No. 64-5985. Reference is made to publications and the like.
【0003】ここに、特公平3-69615 号公報は、連続鋳
造用鋳型において溶融金属入り側から難導電性の加熱帯
(電磁誘導コイルを使用)を、また、これに続けて導電
性の冷却帯をそれぞれ配置し、さらに、加熱帯、冷却帯
の内側全長にわたって溶融金属の導入管を配し、加熱作
用により鋳型内における初期凝固殻の生成を制御し、湯
面と凝固開始点をできるだけ分離し湯面変動の影響を受
けないようにして表面性状の改善を図った技術であり、
また、特開平1-284469号方向は、タンディッシュまたは
給湯ノズルと連続鋳造用鋳型を直結した装置を用いた溶
鋼の鋳造方法において、鋳型の入口直前に該鋳型に沿っ
て周回させた通電管に高周波電流を供給し、それによっ
て発生する電磁力により溶鋼を該直結部境界において非
接触として鋳造し、該直結部境界部でのバリ差しを回避
するともともにコールド・シャット等の表面欠陥を低減
した技術であり、さらに、特公昭64-5985 号公報は、タ
ンディッシュノズルとモールドとの境界における溶鋼の
固着を防ぐために、該ノズルと鋳型間に間隔をあけ、か
つ該境界付近で溶鋼を電磁力により円周方向に偏寄、縮
径させ、モールド内面において冷却されて溶融金属の表
層部に生じる凝固シェルの厚さをその周囲において均一
になるようにした技術である。Japanese Patent Publication No. 3-69615 discloses a continuous casting mold in which a hardly conductive heating zone (using an electromagnetic induction coil) is used from the molten metal entering side, and subsequently a conductive cooling zone. Each zone is arranged, and further, a molten metal introduction pipe is placed over the entire length of the inside of the heating zone and the cooling zone, and the generation of the initial solidified shell in the mold is controlled by the heating action to separate the molten metal surface and the solidification starting point as much as possible It is a technology that improves the surface quality without being affected by fluctuations in the molten metal level.
Further, in JP-A 1-284469 direction, in a molten steel casting method using an apparatus in which a tundish or a hot water supply nozzle and a continuous casting mold are directly connected, a current-carrying pipe is made to circulate along the mold immediately before the mold inlet. A high-frequency current is supplied, and the electromagnetic force generated thereby casts molten steel as non-contact at the boundary of the direct connection part, avoids burrs at the boundary part of the direct connection part, and reduces surface defects such as cold shut. In addition, in Japanese Patent Publication No. Sho 64-5985, in order to prevent the molten steel from sticking at the boundary between the tundish nozzle and the mold, a space is provided between the nozzle and the mold, and the molten steel is subjected to electromagnetic force near the boundary. With the technology to deviate in the circumferential direction and reduce the diameter, the thickness of the solidified shell that is cooled on the inner surface of the mold and generated on the surface layer of the molten metal becomes uniform around it. is there.
【0004】[0004]
【発明が解決しようとする課題】ところで、上記の特公
平3-69615 号公報に開示の技術では、導入管に沿った熱
伝達が大きいために凝固開始位置が安定せず、不連続な
初期凝固殻の生成に伴い表面欠陥が発生するという問題
があった。また、特開平1-284469号公報では、鋳型と電
通管を接触させるために上記同様、凝固開始位置が安定
せず、とくに、タンディッシュノズルと連続鋳造用鋳型
との境界において溶鋼が接触しないように溶鋼を縮径す
る場合には、初期凝固殻が該縮径部で生成したときに径
拡大時に割れ等の表面欠陥が残り、また初期凝固殻が該
縮径部を越した下流側で生成したときには鋳型と接触し
た部分で初期凝固殻が生成することになるため、初期凝
固速度が速く鋳型冷却の不均一性の影響を受けて割れ等
の表面欠陥が生成し、結局は表面欠陥を解消しきれない
というおそれがあった。By the way, in the technique disclosed in Japanese Patent Publication No. 3-69615, the heat transfer along the introduction pipe is large, so that the solidification start position is not stable and the initial solidification is discontinuous. There was a problem that surface defects were generated with the formation of the shell. Further, in JP-A 1-284469, the solidification start position is not stable in the same manner as described above in order to bring the mold and the conductive tube into contact with each other, and in particular, so that molten steel does not contact at the boundary between the tundish nozzle and the continuous casting mold. When the molten steel is reduced in diameter, surface defects such as cracks remain when the initial solidified shell is generated in the reduced diameter portion when the diameter is expanded, and the initial solidified shell is generated in the downstream side beyond the reduced diameter portion. When this happens, the initial solidification shell is generated in the part that is in contact with the mold, so the initial solidification rate is fast and the surface defects such as cracks are generated under the influence of the nonuniformity of the mold cooling, and eventually the surface defects are eliminated. There was a fear that it could not be exhausted.
【0005】この発明の目的は、初期凝固殻の生成位置
を安定しかつ連続的に生成させて、オシレーションマー
クに伴い発生する割れやノロかみ等の表面欠陥の軽減さ
れた品質の良好な鋳造鋳片を製造できる方法および装置
を提案するところにある。An object of the present invention is to perform stable and continuous generation of the initial solidified shell, and to reduce the surface defects such as cracks and burrs that occur along with the oscillation mark, and to achieve good quality casting. There is a proposal for a method and an apparatus capable of producing a slab.
【0006】[0006]
【課題を解決するための手段】この発明は、竪型連続鋳
造機を用いて溶鋼の連続鋳造を行うに当たり、タンディ
ッシュノズルと連続鋳造用鋳型との間にすき間を成形
し、このすき間において溶鋼を凝固させて初期凝固殻を
形成し、該鋳型でさらにその凝固を進行させることを特
徴とする溶鋼の連続鋳造方法 (第1発明)であり、第1
発明において、初期凝固殻の断面形状は連続鋳造用鋳型
の入側開口断面形状とほぼ同等になるように該初期凝固
殻を保持する (第2発明) 。The present invention, when performing continuous casting of molten steel using a vertical continuous casting machine, forms a gap between a tundish nozzle and a continuous casting mold, and melts the molten steel in this gap. Is a continuous casting method for molten steel (first invention), characterized in that an initial solidified shell is formed by solidifying the molten steel, and the solidification is further advanced in the mold.
In the invention, the initial solidified shell is held so that the cross-sectional shape of the initial solidified shell is substantially the same as the cross-sectional shape of the inlet side opening of the continuous casting mold (second invention).
【0007】また、この発明は、第1発明または第2発
明において、タンディッシュノズルと連続鋳造用鋳型と
の間で形成したすき間において適切な磁場分布を与えつ
つ初期凝固殻を保持する (第3発明) か、あるいは第1
発明、第2発明または第3発明において、タンディッシ
ュノズルと連続鋳造用鋳型との間に気密空間を形成しこ
の気密空間の圧力を高めて初期凝固殻を保持する (第4
発明) 。Further, according to the present invention, in the first invention or the second invention, the initial solidified shell is retained while providing an appropriate magnetic field distribution in the gap formed between the tundish nozzle and the continuous casting mold (third invention). Invention) or first
In the invention, the second invention or the third invention, an airtight space is formed between the tundish nozzle and the continuous casting mold, and the pressure of the airtight space is increased to hold the initial solidified shell (fourth
Invention).
【0008】この発明に適合する溶鋼の竪型連続鋳造装
置としては、タンディッシュノズルとこのタンディッシ
ュノズルにすき間を隔てて配置される連続鋳造用鋳型を
備え、タンディッシュノズルおよび連続鋳造用鋳型の相
互間に、そのすき間にて形成される溶鋼の初期凝固殻を
保持するとともに該初期凝固殻を加熱することができる
高周波誘導コイルを配置したものにて構成する (第5発
明) のがよく、タンディッシュノズルと連続鋳造用鋳型
との間にはそれらを相互につなぎ、その内部で加圧でき
る気密容器を備える (第6発明) ものとする。As a vertical continuous casting apparatus for molten steel according to the present invention, a tundish nozzle and a continuous casting mold arranged with a gap between the tundish nozzle and the tundish nozzle are provided. It is preferable that the high-frequency induction coils are arranged between each other to hold the initial solidified shell of molten steel formed in the gap and heat the initial solidified shell (fifth invention), The tundish nozzle and the continuous casting mold are connected to each other, and an airtight container capable of pressurizing inside is provided (sixth invention).
【0009】[0009]
【発明の実施の形態】この発明では、タンディッシュノ
ズルと鋳型間との間にすき間を形成し、このすき間の領
域において溶鋼を凝固させて初期凝固殻を形成するよう
にしたので、オシレーションマーク等の表面欠陥は極め
て軽減されたものとなる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a gap is formed between the tundish nozzle and the mold, and molten steel is solidified in the region of this gap to form an initial solidified shell. The surface defects such as .. are extremely reduced.
【0010】すき間における溶鋼の側面保持はその表面
張力か、溶鋼の表面張力と高周波磁場による電磁力によ
って、または溶鋼の表面張力と加圧ポンプによる気密容
器内でのガス加圧、あるいは溶鋼の表面張力と高周波磁
場による電磁力と加圧ポンプによる気密容器内でのガス
加圧によって保持する。The side surface of the molten steel is held in the gap by the surface tension, the surface tension of the molten steel and the electromagnetic force of the high frequency magnetic field, or the surface tension of the molten steel and the gas pressurization in the airtight container by the pressure pump, or the surface of the molten steel. It is held by electromagnetic force by tension and high frequency magnetic field and gas pressurization in an airtight container by a pressure pump.
【0011】この発明においては、タンディッシュノズ
ルと連続鋳造用鋳型が分離されたものとなるので、連続
鋳造を容易に中断、再開することが可能となる利点があ
る。In the present invention, since the tundish nozzle and the continuous casting mold are separated, there is an advantage that continuous casting can be easily interrupted and restarted.
【0012】この発明における、より好ましい条件とし
てはすき間における溶鋼の初期凝固殻の断面形状は連続
鋳造用鋳型の入側開口断面形状とほぼ同等になるように
するのが望ましい。というのは、すき間の領域において
形成した溶鋼の初期凝固殻が連続鋳造用鋳型に侵入する
際に大きく変形し割れやコールドシャットが生成するこ
とを避けることができるからである。As a more preferable condition in the present invention, it is desirable that the cross-sectional shape of the initially solidified shell of the molten steel in the gap be substantially equal to the cross-sectional shape of the inlet side opening of the continuous casting mold. This is because it is possible to prevent the initial solidified shell of the molten steel formed in the gap region from being greatly deformed when entering the continuous casting mold to generate cracks or cold shut.
【0013】溶鋼の初期凝固を形成するには、すき間の
領域において放射温度計等によって温度を測定し適用鋼
種の凝固温度以下になるように溶鋼に急激な温度勾配を
生じさせればよく、そのためには鋳型において溶鋼に対
して強冷却を行うか、あるいは鋳型での強冷却とすき間
の領域において配置した高周波誘導コイルによる加熱を
組合せることによって実現可能であり、これによって溶
鋼の初期凝固殻は安定的に形成される。In order to form the initial solidification of the molten steel, it is sufficient to measure the temperature in the gap region with a radiation thermometer or the like and to generate a sharp temperature gradient in the molten steel so that the temperature is below the solidification temperature of the applicable steel type. Can be achieved by performing strong cooling on the molten steel in the mold, or by combining strong cooling in the mold and heating with a high-frequency induction coil placed in the gap region, whereby the initial solidified shell of the molten steel is formed. Stable formation.
【0014】このように鋳片ストランドの表層部を形成
する初期凝固殻は鋳型の拘束を受けないため、鋳型冷却
の不均一性の影響を受けて表面欠陥を生成するおそれが
なく、また、初期凝固殻の縮径、径拡大時における変形
よって生成する割れやコールド・シャット等に起因する
表面欠陥の生成もなく、表面性状の良好な鋳片を得るこ
とが可能となる。As described above, since the initial solidified shell forming the surface layer of the cast strand is not restricted by the mold, there is no possibility of generating surface defects under the influence of non-uniformity of cooling of the mold, and the initial stage. It is possible to obtain a slab having a good surface property without the generation of cracks generated by the shrinkage of the solidified shell or the deformation at the time of expanding the diameter or the generation of surface defects due to cold shut or the like.
【0015】この発明に従いタンディッシュノズルと連
続鋳造用鋳型との間に気密空間を形成しこの気密空間の
内部で加圧を行うか、あるいは高周波誘導コイルによる
電磁力を制御することにより溶鋼の初期凝固殻の形状の
維持・矯正が可能となる。なお、この発明を実施するに
当たって、気密空間の内部で加圧を行う場合、その内圧
はすき間での溶湯静圧から電磁力による圧力を差し引い
た程度の大きさとして、すき間での溶湯がバランスする
よう調整する必要がある。また、すき間の寸法に関して
は印加可能な電磁力、すき間での溶湯表面における安定
性から100mm以下とすることが好ましい。連続鋳造用鋳
型の振動数については鋳造速度が1.2m/minの場合で84.6
cpm 程度となる。According to the present invention, an airtight space is formed between the tundish nozzle and the continuous casting mold, and pressurization is performed inside the airtight space, or by controlling the electromagnetic force by the high frequency induction coil, the molten steel is initially heated. It is possible to maintain and correct the shape of the solidified shell. In carrying out the present invention, when pressurization is performed inside the airtight space, the internal pressure is as large as the molten metal static pressure in the gap minus the pressure due to the electromagnetic force, and the molten metal in the gap is balanced. Need to be adjusted. The size of the gap is preferably 100 mm or less in view of the electromagnetic force that can be applied and the stability of the molten metal surface in the gap. The frequency of the continuous casting mold was 84.6 when the casting speed was 1.2 m / min.
It is about cpm.
【0016】[0016]
【実施例】図1は、この発明に適合する連続鋳造装置の
構成を示したしものであり、図中1はタンディッシュ、
2はタイディッシュノズル、3は連続鋳造用鋳型(振動
鋳型)、4は高周波誘導コイル、5は磁場の分布を制御
するための磁性体であって、高周波誘導コイル4および
磁性体5はタンディシュノズル2と連続鋳造用鋳型3の
間に形成されるすき間において配置される。また、6は
モールドパウダー供給機構、7は凝固シェルである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a continuous casting apparatus according to the present invention, in which 1 is a tundish,
2 is a tide dish nozzle, 3 is a continuous casting mold (vibration mold), 4 is a high frequency induction coil, 5 is a magnetic body for controlling the distribution of the magnetic field, and the high frequency induction coil 4 and the magnetic body 5 are tundish. It is arranged in a gap formed between the nozzle 2 and the continuous casting mold 3. Further, 6 is a mold powder supply mechanism, and 7 is a solidification shell.
【0017】図2〜図4は、この発明に従う装置の他の
構成例を示したものである。これらの例は、タンディッ
シュノズル2と連続鋳造用鋳型用3との間にポンプPに
って加圧可能な気密容器8を配置したものであって、こ
れによって初期凝固殻7aを保持できる。2 to 4 show another example of the configuration of the device according to the present invention. In these examples, an airtight container 8 that can be pressurized by a pump P is arranged between the tundish nozzle 2 and the continuous casting mold 3, and the initial solidified shell 7a can be held by this.
【0018】図2に示した如き構成になる装置を使用し
て、 鋳造速度:1.2 m/min 鋳型振動数:85 cpm モールド寸法:1200mm×260 mm 高周波誘導コイルの電源電力:800 kW, 周波数:20kHz 気密容器内の圧力:1.6 atm の条件で連続鋳造を行い、オシレーションマーク深さ、
スラブの表面欠陥発生指数(割れや1口かみ等の欠陥が
鋳片表面に発生する割合を表示したもの)について調査
した。その結果を従来の装置 (タンディッシュ内の溶鋼
を浸漬ノズルを介して連続用鋳型に供給して鋳造を行う
通常の鋳造装置) を用いた場合の結果とともに図5,図
6に示す。Using the apparatus having the structure shown in FIG. 2, casting speed: 1.2 m / min Mold frequency: 85 cpm Mold size: 1200 mm × 260 mm Power supply of high frequency induction coil: 800 kW, Frequency: Pressure in a 20kHz airtight container: Continuous casting was performed under the condition of 1.6 atm, and the oscillation mark depth,
The surface defect generation index of the slab (indicating the rate at which defects such as cracks and bite bite are generated on the surface of the slab) was investigated. The results are shown in FIGS. 5 and 6 together with the results when a conventional apparatus (a normal casting apparatus in which molten steel in a tundish is supplied to a continuous casting mold through an immersion nozzle to perform casting).
【0019】図5,図6より明らかな如く、この発明に
従い連続鋳造を行うことによって極めて良好な表面性状
を有する鋳造鋳片を製造できることが確認できた。As is clear from FIGS. 5 and 6, it was confirmed that a cast slab having an extremely good surface quality can be produced by performing continuous casting according to the present invention.
【0020】[0020]
【発明の効果】この発明によれば、溶鋼の初期凝固殻生
成時に余計な外力が加わらず、かつ連続的に初期凝固が
進行するので、鋳型オシレーションに起因する表面欠陥
が軽減され表面品質の良好な鋳造鋳片を安定して製造で
きる。EFFECTS OF THE INVENTION According to the present invention, no extraneous force is applied during the initial solidification shell formation of molten steel, and the initial solidification proceeds continuously, so that surface defects caused by mold oscillation are reduced and the surface quality is improved. A good cast slab can be stably manufactured.
【図1】この発明に従う鋳造装置の構成を示した図であ
る。FIG. 1 is a diagram showing a configuration of a casting apparatus according to the present invention.
【図2】この発明に従う鋳造装置の構成を示した図であ
る。FIG. 2 is a diagram showing a configuration of a casting apparatus according to the present invention.
【図3】この発明に従う鋳造装置の構成を示した図であ
る。FIG. 3 is a diagram showing a configuration of a casting apparatus according to the present invention.
【図4】この発明に従う鋳造装置の構成を示した図であ
る。FIG. 4 is a diagram showing a configuration of a casting apparatus according to the present invention.
【図5】鋳造鋳片の品質を調査した結果を示した図であ
る。FIG. 5 is a diagram showing results of investigating the quality of cast slabs.
【図6】スラブの表面欠陥発生指数を比較して示した図
である。FIG. 6 is a diagram showing a comparison of surface defect occurrence indexes of slabs.
1 タンディッシュ 2 タンディッシュノズル 3 連続鋳造用鋳型 4 高周波誘導コイル 5 磁性体 6 モールドパウダー供給機構 7 凝固シェル 8 気密容器 1 Tundish 2 Tundish nozzle 3 Continuous casting mold 4 High frequency induction coil 5 Magnetic material 6 Mold powder supply mechanism 7 Solidification shell 8 Airtight container
Claims (6)
造を行うに当たり、タンディッシュノズルと連続鋳造用
鋳型との間にすき間を成形し、このすき間において溶鋼
を凝固させて初期凝固殻を形成し、該鋳型でさらにその
凝固を進行させることを特徴とする溶鋼の連続鋳造方
法。1. When performing continuous casting of molten steel using a vertical continuous casting device, a gap is formed between a tundish nozzle and a continuous casting mold, and the molten steel is solidified in this gap to form an initial solidified shell. A continuous casting method for molten steel, characterized in that the molten steel is formed and further solidified in the mold.
の入側開口断面形状とほぼ同等になるように該初期凝固
殻を保持する請求項1記載の方法。2. The method according to claim 1, wherein the initial solidified shell is held so that the cross sectional shape of the initial solidified shell is substantially equal to the cross sectional shape of the inlet side opening of the continuous casting mold.
との間で形成したすき間において適切な磁場分布を与え
つつ初期凝固殻を保持することを特徴とする請求項1ま
たは2のいずれかに記載の方法。3. The initial solidified shell is held while giving an appropriate magnetic field distribution in the gap formed between the tundish nozzle and the continuous casting mold. Method.
との間に気密空間を形成しこの気密空間の圧力を高めて
初期凝固殻を保持する請求項1,2または3のいずれか
に記載の方法。4. The method according to claim 1, wherein an airtight space is formed between the tundish nozzle and the continuous casting mold, and the pressure in the airtight space is increased to hold the initial solidified shell. .
ディッシュノズルとこのタンディッシュノズルにすき間
を隔てて配置される連続鋳造用鋳型を備え、タンディッ
シュノズルおよび連続鋳造用鋳型の相互間に、そのすき
間にて形成される溶鋼の初期凝固殻を保持するとともに
該初期凝固殻を加熱する高周波誘導コイルを配置してな
る、溶鋼の連続鋳造装置。5. A vertical continuous casting apparatus for molten steel, comprising a tundish nozzle and a continuous casting mold arranged in the tundish nozzle with a gap between the tundish nozzle and the continuous casting mold. A continuous casting apparatus for molten steel, in which a high-frequency induction coil that holds the initial solidified shell of molten steel formed in the gap and heats the initial solidified shell is arranged.
とを相互につなぎ、その内部で加圧できる気密容器を備
える請求項5記載の装置。6. The apparatus according to claim 5, further comprising an airtight container that connects the tundish nozzle and the continuous casting mold to each other and that can pressurize inside thereof.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24175195A JPH08197195A (en) | 1994-11-22 | 1995-09-20 | Method for continuous casting of molten steel and device therefor |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28787594 | 1994-11-22 | ||
JP6-287875 | 1994-11-22 | ||
JP24175195A JPH08197195A (en) | 1994-11-22 | 1995-09-20 | Method for continuous casting of molten steel and device therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08197195A true JPH08197195A (en) | 1996-08-06 |
Family
ID=26535428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24175195A Pending JPH08197195A (en) | 1994-11-22 | 1995-09-20 | Method for continuous casting of molten steel and device therefor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08197195A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102672124A (en) * | 2012-04-25 | 2012-09-19 | 莱芜钢铁集团有限公司 | Continuous casting equipment and method of gradient steel materials |
-
1995
- 1995-09-20 JP JP24175195A patent/JPH08197195A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102672124A (en) * | 2012-04-25 | 2012-09-19 | 莱芜钢铁集团有限公司 | Continuous casting equipment and method of gradient steel materials |
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