JPH07284811A - Production of thick steel plate without seam flaw - Google Patents

Production of thick steel plate without seam flaw

Info

Publication number
JPH07284811A
JPH07284811A JP9704994A JP9704994A JPH07284811A JP H07284811 A JPH07284811 A JP H07284811A JP 9704994 A JP9704994 A JP 9704994A JP 9704994 A JP9704994 A JP 9704994A JP H07284811 A JPH07284811 A JP H07284811A
Authority
JP
Japan
Prior art keywords
rolling
faces
width
heating
parts
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.)
Withdrawn
Application number
JP9704994A
Other languages
Japanese (ja)
Inventor
Takashi Hisatsune
貴史 久恒
Matsuo Adaka
松男 阿高
Kenji Yamada
健二 山田
Yukihiro Chiba
幸弘 千葉
Original Assignee
Nippon Steel Corp
新日本製鐵株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp, 新日本製鐵株式会社 filed Critical Nippon Steel Corp
Priority to JP9704994A priority Critical patent/JPH07284811A/en
Publication of JPH07284811A publication Critical patent/JPH07284811A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE:To easily and surely suppress the generation of seam flaws in the end parts in the width direction after finish rolling by heating and rolling the surface and back faces and side end faces of corresponding parts to the end parts in the width direction of a thick steel plate or the only surface and back faces of these parts before rolling for every rolling pass. CONSTITUTION:The surface and back faces in the tip and rear end parts of a slab 4 are heated with an induction heating device 2 for surface and back faces which is provided on this side of a rolling mill 1 and cross rolling is executed. In the first one pass of the cross rolling, when the induction heating device 2 for surface and back faces and a induction heating device 3 for side faces are provided in the end parts in the width direction of the slab 4, after heating the surface and back faces and side faces in the end parts in the width direction before turning the slab 4, the slab 4 is turned by 90 deg., rolling is executed and finish rolling is executed to a prescribed thickness. In this way, yield is drastically improved by reducing repairing rate and trimming amount in the end parts of width on the manufacture of thick plate.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、鋼片を幅出し圧延およ
び仕上げ圧延することによって厚鋼板を製造するに際
し、厚鋼板の幅方向端部の表裏面に圧延方向に伸びたシ
ーム疵を発生させることなく厚鋼板を製造する方法に関
するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention produces seam flaws extending in the rolling direction on the front and back surfaces of the widthwise edges of a thick steel plate when manufacturing the thick steel plate by tentering and finishing rolling the steel slab. The present invention relates to a method for manufacturing a thick steel plate without performing the above.
【0002】[0002]
【従来の技術】厚鋼板を製造する際に、厚鋼板の幅方向
端部の表裏面に圧延方向に伸びたシーム疵と呼ばれる倒
れ込み疵が発生しやすい。このシーム疵の発生を防止す
るため、これまでにいくつかの方法が開示されている。
2. Description of the Related Art When manufacturing thick steel plates, falling defects called seam flaws extending in the rolling direction are apt to occur on the front and back surfaces of the widthwise ends of the thick steel plates. Several methods have been disclosed so far in order to prevent the occurrence of seam flaws.
【0003】たとえば、特公昭41−16928号公報
には、鋳塊の長手方向端部にコーナーカッティングを施
す方法が記載されている。特公昭59−39202号公
報には、厚板用スラブの隅角部を20〜80mmの曲率
半径で丸みをつけた形状として圧延する方法が記載され
ている。これらの端部加工方法はシーム疵防止に対して
確実ではあるが、作業性、量産性および歩留損失の点に
問題がある。
For example, Japanese Examined Patent Publication No. 41-16928 discloses a method of performing corner cutting on an end portion in the longitudinal direction of an ingot. Japanese Examined Patent Publication No. 59-39202 discloses a method of rolling a corner portion of a slab for thick plates into a rounded shape with a radius of curvature of 20 to 80 mm. These edge processing methods are reliable for preventing seam flaws, but have problems in workability, mass productivity, and yield loss.
【0004】また、孔形ロールによるエッジング圧延を
行いスラブ側面を成形する方法が、特公昭50−146
32号公報、特開昭62−199202号公報、特開昭
62−224406号公報などに開示されている。この
方法によると、スラブ厚が異なると適した孔形形状も異
なり、スラブ厚に応じた種々の孔形形状を有する竪ロー
ルが必要となる。
A method of forming the side surface of a slab by performing edging rolling with a hole-shaped roll is disclosed in Japanese Patent Publication No. 50-146.
No. 32, JP-A-62-199202, JP-A-62-224406 and the like. According to this method, the suitable hole shape differs depending on the slab thickness, and vertical rolls having various hole shapes according to the slab thickness are required.
【0005】熱間圧延鋼板に関するシーム疵防止技術と
して、特開平4−123802号公報には、仕上げ圧延
前に粗シートバーの幅方向端部を端部加熱装置により1
300℃以上の高温域まで加熱した後、仕上げ圧延する
方法が開示されている。しかし、厚板圧延においては、
所定の幅寸法を得るために幅出し圧延が行われ、幅出し
圧延時に発生したシーム疵は後の仕上げ圧延の際に成長
するため、仕上げ圧延前の端部加熱のみでは、シーム疵
を確実に防止することができない。
As a seam flaw prevention technique for hot-rolled steel sheets, Japanese Unexamined Patent Publication No. 4-123802 discloses that a widthwise end portion of a rough sheet bar is heated by an end heating device before finish rolling.
A method of finishing rolling after heating to a high temperature region of 300 ° C. or higher is disclosed. However, in plate rolling,
The tenter rolling is performed to obtain the specified width dimension, and the seam flaws generated during tenter rolling grow during the subsequent finish rolling.Therefore, only the edge heating before the finish rolling ensures the seam flaw. Cannot be prevented.
【0006】[0006]
【発明が解決しようとする課題】本発明の目的は、厚鋼
板の幅方向端部の表裏面に圧延方向に伸びたシーム疵が
発生するのを防止し、品質、歩留の一層の向上を図る厚
鋼板の製造方法を提供することである。
SUMMARY OF THE INVENTION An object of the present invention is to prevent the occurrence of seam flaws extending in the rolling direction on the front and back surfaces of the widthwise edges of thick steel plates, and to further improve quality and yield. It is to provide a method for manufacturing a thick steel plate.
【0007】[0007]
【課題を解決するための手段】本発明は、鋼片を幅出し
圧延および仕上げ圧延することによって厚鋼板を製造す
る際、全ての圧延パスもしくは少なくとも幅出し圧延で
の1回を含む複数回の圧延パスにおいて、各圧延パス毎
に、圧延前に、厚鋼板の幅方向端部に相当する部位の表
裏面および側端面、もしくは該部位の表裏面のみを加熱
し圧延することを特徴とするシーム疵のない厚鋼板の製
造方法である。なお、厚鋼板の幅方向端部に相当する部
位とは、幅出し圧延時の鋼片の先後端部および仕上げ圧
延時の鋼片の幅方向端部を指す。
According to the present invention, when a thick steel sheet is manufactured by tentering rolling and finish rolling a billet, all of the rolling passes or a plurality of times including at least one time of tentering rolling are performed. In the rolling pass, a seam characterized by heating and rolling only the front and back surfaces and side end surfaces of a portion corresponding to the widthwise end portion of the thick steel plate, or only the front and back surfaces of the portion, before each rolling in each rolling pass. This is a manufacturing method for thick steel plates without flaws. The portions corresponding to the widthwise end portions of the thick steel sheet refer to the front and rear end portions of the steel piece during tenter rolling and the widthwise end portions of the steel piece during finish rolling.
【0008】[0008]
【作用】鋼片は幅出し圧延および仕上げ圧延中に大気へ
の放熱、ロールへの抜熱により、表裏面の温度は鋼片の
内部温度に比べて低下する。なかでも、長手方向および
幅方向の端部は表裏面および側面が放熱面となるため、
温度低下が著しい。このような温度の不均一は、長手方
向および幅方向に変形抵抗差を生じさせるために、端部
の形状不整、すなわち凹凸をもたらす。また、鋼片の圧
延機への噛み込み時および圧延機からの尻り抜け時の圧
延は通常不均一な変形が生じるため、幅出し圧延時の鋼
片の先後端部の形状不整は先に述べた温度不均一に起因
する形状不整とも相まって著しくなる。幅出し圧延時の
先後端部は、仕上げ圧延前に90°回転され、仕上げ圧
延時の幅方向端部となる。そのため、幅出し圧延によっ
て形成された仕上げ圧延時の幅方向側面の凹凸は、仕上
げ圧延中のバレリング(側面の板厚中央部が幅方向に張
り出す現象)の成長に伴い、凸部がラップすることで線
状の疵となり、その後の板厚減少にともない鋼板の表裏
面のエッジ近傍に回り込み、長手方向に伸びた線状疵す
なわちシーム疵となる。なお、幅出し圧延を行わない場
合においても、温度低下による幅方向側面の形状不整が
生じており、幅出し圧延を行った場合に比べると疵の深
さ、表裏面への回り込み量は少ないが、シーム疵が観察
される。
The temperature of the front and back surfaces of the steel slab becomes lower than the internal temperature of the steel slab due to heat radiation to the atmosphere and heat removal to the roll during tentering rolling and finish rolling. Above all, since the front and back surfaces and the side surfaces are the heat dissipation surfaces at the ends in the longitudinal direction and the width direction,
The temperature drops significantly. Such non-uniformity in temperature causes irregularity in the shape of the end portion, that is, unevenness, because a difference in deformation resistance occurs in the longitudinal direction and the width direction. In addition, when rolling the billet into the rolling mill and when rolling out from the rolling mill, uneven deformation is usually generated.Therefore, the irregular shape of the front and rear ends of the billet during tenter rolling should be performed first. It becomes remarkable in combination with the above-mentioned shape irregularity caused by the temperature nonuniformity. The front and rear ends during tenter rolling are rotated by 90 ° before finish rolling to become the width direction end during finish rolling. Therefore, the unevenness on the lateral surface in the width direction during finish rolling formed by tenter rolling wraps the convex portion along with the growth of ballering (a phenomenon in which the center part of the plate thickness of the side surface overhangs in the width direction) during finish rolling. As a result, a linear flaw is formed, and as the thickness of the steel sheet is reduced thereafter, it wraps around the edges of the front and back surfaces of the steel sheet and becomes a linear flaw extending in the longitudinal direction, that is, a seam flaw. Even when the tenter rolling is not performed, the shape irregularity of the side surface in the width direction is caused by the temperature decrease, and the depth of the flaw and the amount of wraparound to the front and back surfaces are less than those when the tenter rolling is performed. , Seam defects are observed.
【0009】本発明の方法で厚鋼板の幅方向端部に相当
する幅出し圧延における先後端部の表裏面および側端面
を圧延前に加熱することにより、端部の温度低下を補償
することが可能となるため、幅出し圧延時の先後端部の
形状不整を抑制し、ひいては仕上げ圧延後の幅方向端部
の形状不整に起因するシーム疵の発生を防止することが
できる。
By the method of the present invention, by heating the front and rear surfaces and the side end surfaces of the front and rear ends in the tenter rolling corresponding to the widthwise ends of the thick steel plate before rolling, it is possible to compensate for the temperature drop at the ends. As a result, it is possible to suppress the shape irregularity of the front and rear end portions during tentering rolling, and to prevent the occurrence of seam flaws due to the shape irregularity of the widthwise end portion after finish rolling.
【0010】仕上げ圧延時の幅方向端部を加熱しても同
様の効果が得られるばかりでなく、幅出し圧延時の端部
加熱が十分でなく微小な疵が生じた場合でも、板厚減少
にともない幅方向側面が表裏面へ回り込む量を減少させ
ることができ、幅方向側面に発生した線状疵が表裏面へ
回り込むことを抑制することができる。
Not only the same effect can be obtained by heating the widthwise end portion during finish rolling, but also when the end portion heating during tenter rolling is insufficient and a minute flaw occurs, the sheet thickness is reduced. Accordingly, it is possible to reduce the amount of the width direction side surface that wraps around the front and back surfaces, and it is possible to suppress the linear flaw generated on the width direction side surface from wrapping around the front and back surfaces.
【0011】以下、本発明を図面に従って詳細に説明す
る。
The present invention will be described in detail below with reference to the drawings.
【0012】図1は本発明を実施するための装置の例を
示す概略図であり、図2は鋼片を圧延して厚鋼板を製造
する工程を示す図である。一般に、鋼片は形状調整圧延
された後、幅出し圧延、仕上げ圧延を行って厚鋼板とな
る。本発明の方法においては、鋼片厚および断面形状調
整のため形状調整圧延された鋼片は、90°回転された
後、図1(a)に示すような圧延機1の手前に設置した
表裏面用誘導加熱装置2によって先後端部の表裏面が加
熱され、幅出し圧延される。なお、幅出し圧延の最初の
1パスにおいては、図1(b)に示すように表裏面用誘
導加熱装置2および側端面用誘導加熱装置3を鋼片4の
幅方向端部に設置した場合には、鋼片4の回転前に幅方
向端部の表裏面および側面を加熱した後、鋼片4を90
°回転させて圧延することも可能である。次に、所定の
幅寸法まで幅出し圧延した鋼片4を90°回転した後、
図1(b)に示すように圧延機1の手前に設置した表裏
面用誘導加熱装置2および側端面用誘導加熱装置3によ
り、鋼片4の幅方向端部の表裏面および側面が加熱され
ながら、所定の厚みまで仕上げ圧延される。
FIG. 1 is a schematic view showing an example of an apparatus for carrying out the present invention, and FIG. 2 is a view showing a process of rolling a steel slab to produce a thick steel plate. In general, a steel slab is shape-adjusted and rolled, then tentering and finish-rolled to form a thick steel plate. In the method of the present invention, the shape-adjusted and rolled steel slab for adjusting the thickness and cross-sectional shape of the steel slab is rotated by 90 ° and then placed on the front side of the rolling mill 1 as shown in FIG. 1 (a). The front and back surfaces of the front and rear end portions are heated by the back surface induction heating device 2, and are tentered and rolled. In the first one pass of tenter rolling, as shown in FIG. 1B, when the front and back induction heating device 2 and the side end face induction heating device 3 are installed at the widthwise end portions of the steel slab 4. Before the steel slab 4 is rotated, the front and back surfaces and the side surfaces of the widthwise end portion are heated, and then the steel slab 4 is heated to 90 degrees.
It is also possible to rotate by rolling. Next, after rotating the billet 4 that has been tentered and rolled to a predetermined width dimension by 90 °,
As shown in FIG. 1B, the front and back induction heating devices 2 and the side end face induction heating devices 3 installed in front of the rolling mill 1 heat the front and back surfaces and side faces of the widthwise end of the steel slab 4. Meanwhile, finish rolling is performed to a predetermined thickness.
【0013】端部の加熱方法としては、誘導加熱、ガス
バーナー、輻射熱加熱などが考えられるが、誘導加熱が
好ましい。
As a method of heating the end portion, induction heating, gas burner, radiant heating, etc. can be considered, but induction heating is preferable.
【0014】加熱温度は端部の温度低下量を補償できれ
ばよく、最大で300℃程度の温度上昇が可能な容量の
加熱装置を用いれば十分である。
It suffices that the heating temperature be able to compensate for the temperature decrease amount at the end, and it is sufficient to use a heating device having a capacity capable of increasing the temperature up to about 300 ° C.
【0015】端部は表裏面および側端面の両面加熱する
ことが望ましいが、設備上の加熱装置配置の問題などが
ある場合には、表裏面からの加熱のみでもよい。
It is desirable to heat both the front and back surfaces and the side end surfaces at the ends, but if there is a problem in the arrangement of the heating device on the equipment, heating from both the front and back surfaces may be sufficient.
【0016】加熱範囲は、表裏面については、幅出し圧
延の場合、長手方向に均一な温度分布の鋼片が得られる
範囲、例えば先後端部から全長の2割程度の範囲のみで
も十分である。仕上げ圧延の場合、幅方向に均一な温度
分布の鋼片が得られる範囲、例えば側端面から全幅の2
割程度の範囲のみでも十分である。また、側端面につい
ては、鋼片の側端面全体が最もよいが、表裏面近傍から
鋼片厚の2割程度に相当する範囲のみでもよい。
Regarding the front and back surfaces, in the case of tenter rolling, the heating range is sufficient to obtain a steel slab having a uniform temperature distribution in the longitudinal direction, for example, a range of about 20% of the entire length from the front and rear ends. . In the case of finish rolling, a range where a steel piece having a uniform temperature distribution in the width direction can be obtained, for example, 2 from the side end face to the full width.
A range of only about 50% is sufficient. As for the side end face, the entire side end face of the steel slab is the best, but the side end face may be in the range from the vicinity of the front and back surfaces to about 20% of the thickness of the steel slab.
【0017】端部加熱を施す圧延パスについては、幅出
し圧延および仕上げ圧延の全圧延パスが望ましいが、温
度低下に加えて先後端部の不均一変形により顕著な端部
の形状不整がみられる幅出し圧延時に少なくとも1回の
圧延パスと、側端面の表裏面へ回り込みが顕著となる仕
上げ圧延時に複数回の圧延パス実施する場合においても
十分である。この場合、先に述べた理由により、幅出し
圧延で端部加熱を実施する方が仕上げ圧延で実施するよ
りも効果が大きいため、幅出し圧延時に端部加熱を実施
するパス数が多いほど望ましい。加熱原単位などコスト
上の制約がある場合には、先後端部の加熱が容易である
幅出し圧延の第1パスのみに実施する方法でもよい。仕
上げ圧延時に端部加熱を実施する場合、温度低下を極力
防ぐために、ある一定間隔の圧延パスおきに実施する方
法や、端部のバレリング量が大きい最終パス近傍で数回
実施する方法などが採用できる。
As for the rolling pass for applying the end heating, all the rolling passes of tenter rolling and finish rolling are preferable, but in addition to the temperature decrease, the irregular shape of the end is noticeable due to the uneven deformation of the front and rear ends. It is also sufficient to carry out at least one rolling pass at the time of tenter rolling and a plurality of rolling passes at the time of finish rolling in which the wraparound to the front and back surfaces of the side end faces becomes remarkable. In this case, for the reasons described above, it is more effective to carry out the end heating in the tenter rolling than to carry out in the finish rolling.Therefore, the more passes the end heating is carried out in the tenter rolling, the more desirable. . When there is a cost constraint such as a heating unit, the method may be performed only in the first pass of tenter rolling, which makes it easy to heat the front and rear end portions. When performing edge heating during finish rolling, to prevent temperature drop as much as possible, a method of performing it every rolling pass with a certain interval or a method of performing it several times near the final pass where the amount of balling at the edge is large is adopted. it can.
【0018】[0018]
【実施例】表1に厚さ220mm、幅1700mmの鋼
片に本発明を実施した場合の圧延条件を、表2に圧延結
果を示す。誘導加熱装置による温度上昇量は、鋼片の幅
中央部とエッジ部で約100℃程度の温度差が生じるこ
とから、幅出し圧延、仕上げ圧延ともに各パスで100
℃一定とした。加熱は、幅出し圧延の場合鋼片先後端部
(先端および後端から各340mm)の表裏面、仕上げ
圧延の場合鋼片幅方向端部(幅端から340mm)の表
裏面および側面に対し1パスおきに行った。表2から明
らかなように、本発明によれば、仕上げ圧延後の厚鋼板
にシーム疵はみられなかった。
EXAMPLES Table 1 shows rolling conditions when the present invention was applied to a steel piece having a thickness of 220 mm and a width of 1700 mm, and Table 2 shows rolling results. The amount of temperature rise by the induction heating device is about 100 ° C between the width center part and the edge part of the steel slab.
The temperature was constant. Heating is 1 for the front and back surfaces of the front and rear ends of the steel slab (340 mm from the front and rear ends) in the case of tenter rolling, and for the front and back surfaces and side surfaces of the end in the width direction of the steel slab (340 mm from the width end) in finish rolling. I went every other pass. As is clear from Table 2, according to the present invention, no seam flaw was found in the thick steel plate after finish rolling.
【0019】[0019]
【表1】 [Table 1]
【0020】[0020]
【表2】 [Table 2]
【0021】[0021]
【発明の効果】本発明によれば、圧延能率を阻害するこ
となく、仕上げ圧延後の幅方向端部でのシーム疵の発生
を容易に、確実に抑制することができる。この結果、厚
板製造上における手入れ率、幅端部トリミング量の低減
により大幅な歩留向上を図ることが可能となる。
According to the present invention, it is possible to easily and surely suppress the occurrence of seam flaws at the end portions in the width direction after finish rolling without impairing the rolling efficiency. As a result, it is possible to significantly improve the yield by reducing the maintenance ratio and the width edge trimming amount in the production of thick plates.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明を実施するための装置の例を示す図であ
る。
FIG. 1 shows an example of a device for implementing the invention.
【図2】一般的な厚板圧延工程を示す図である。FIG. 2 is a diagram showing a general thick plate rolling process.
【符号の説明】[Explanation of symbols]
1 圧延機 2 表裏面用誘導加熱装置 3 側端面用誘導加熱装置 4 鋼片 5 加熱部位 1 rolling mill 2 induction heating device for front and back surfaces 3 induction heating device for side end surface 4 steel slab 5 heating part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 千葉 幸弘 大分県大分市大字西ノ洲1 新日本製鐵株 式会社大分製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukihiro Chiba 1 Nishinosu, Oita-shi, Oita New Nippon Steel Co., Ltd. Oita Works

Claims (1)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 鋼片を幅出し圧延および仕上げ圧延する
    ことによって厚鋼板を製造する際、全ての圧延パスもし
    くは少なくとも幅出し圧延での1回を含む複数回の圧延
    パスにおいて、各圧延パス毎に、圧延前に、厚鋼板の幅
    方向端部に相当する部位の表裏面および側端面、もしく
    は該部位の表裏面のみを加熱し圧延することを特徴とす
    るシーム疵のない厚鋼板の製造方法。
    1. When manufacturing a thick steel sheet by tentering and finishing rolling a steel slab, all rolling passes or a plurality of rolling passes including at least one tentering rolling are performed for each rolling pass. In, before rolling, a method for producing a thick steel sheet without seam flaws, characterized by heating and rolling only the front and back surfaces and side end surfaces of a portion corresponding to the widthwise end portion of the thick steel sheet, or the front and back surfaces of the portion. .
JP9704994A 1994-04-12 1994-04-12 Production of thick steel plate without seam flaw Withdrawn JPH07284811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9704994A JPH07284811A (en) 1994-04-12 1994-04-12 Production of thick steel plate without seam flaw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9704994A JPH07284811A (en) 1994-04-12 1994-04-12 Production of thick steel plate without seam flaw

Publications (1)

Publication Number Publication Date
JPH07284811A true JPH07284811A (en) 1995-10-31

Family

ID=14181812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9704994A Withdrawn JPH07284811A (en) 1994-04-12 1994-04-12 Production of thick steel plate without seam flaw

Country Status (1)

Country Link
JP (1) JPH07284811A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008044016A (en) * 2007-11-02 2008-02-28 Sumitomo Metal Ind Ltd Method of manufacturing thick steel plate
JP2011067825A (en) * 2009-09-24 2011-04-07 Nippon Steel Corp Method and equipment for manufacturing thick steel plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008044016A (en) * 2007-11-02 2008-02-28 Sumitomo Metal Ind Ltd Method of manufacturing thick steel plate
JP4501989B2 (en) * 2007-11-02 2010-07-14 住友金属工業株式会社 Thick steel plate manufacturing method
JP2011067825A (en) * 2009-09-24 2011-04-07 Nippon Steel Corp Method and equipment for manufacturing thick steel plate

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Effective date: 20010703