JP2530406B2 - Rolling method for extra-thick steel plates with excellent internal quality - Google Patents
Rolling method for extra-thick steel plates with excellent internal qualityInfo
- Publication number
- JP2530406B2 JP2530406B2 JP4063131A JP6313192A JP2530406B2 JP 2530406 B2 JP2530406 B2 JP 2530406B2 JP 4063131 A JP4063131 A JP 4063131A JP 6313192 A JP6313192 A JP 6313192A JP 2530406 B2 JP2530406 B2 JP 2530406B2
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- Prior art keywords
- rolling
- slab
- width direction
- steel sheet
- internal quality
- Prior art date
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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、内質に優れた極厚鋼板
の圧延法に関するものであって、特にスラブのセンター
ポロシティーを効率よく圧延せしめて内質を改善するこ
とを目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method for an extremely thick steel sheet having an excellent internal quality, and particularly to improve the internal quality by efficiently rolling the center porosity of a slab. .
【０００２】[0002]
【従来の技術】内質に優れた極厚鋼板の圧延法について
は、従来種々の方法が提案されている。中でもポロシテ
ィー圧着の観点から、連続鋳造工程あるいは圧延工程で
スラブに部分的に差厚を形成せしめ、継続する圧延パス
における実質的圧延面積（圧延幅）を小さくすることに
よって大圧下圧延を実現する方法がいくつか提案されて
いる。例えば、特開昭５７−１２７５０４号公報では、
被圧延材幅方向の中央部に凸部を形成せしめ、９０°回
転後長手方向に大圧下圧延を行う方法が開示されてい
る。この方法では、鋼板の幅方向中央部については内質
の改善が可能であるが、連続鋳造スラブを用いた極厚鋼
板の製造においては、スラブ幅方向中央部のみならず、
スラブ幅方向端面近傍においても内質が問題となること
から、スラブ幅方向全面にわたっての内質の改善は望め
ない。2. Description of the Related Art Conventionally, various methods have been proposed as a method for rolling an extremely thick steel sheet having excellent internal quality. Among them, from the viewpoint of porosity pressure bonding, large reduction rolling is realized by partially forming a difference thickness on the slab in the continuous casting process or rolling process and reducing the substantial rolling area (rolling width) in the continuous rolling pass. Several methods have been proposed. For example, in JP-A-57-127504,
A method is disclosed in which a convex portion is formed in the central portion in the width direction of the material to be rolled, and after 90 ° rotation, large reduction rolling is performed in the longitudinal direction. In this method, it is possible to improve the inner quality of the widthwise central portion of the steel sheet, but in the production of an extremely thick steel sheet using a continuously cast slab, not only the slab widthwise central portion,
Since the inner quality becomes a problem even in the vicinity of the end face in the slab width direction, improvement in the inner quality over the entire surface in the slab width direction cannot be expected.
【０００３】さらに、特開平２−５５６０５号公報に示
すように、連続鋳造法による鋳片を粗圧延工程で幅出し
圧延を行い、さらに仕上げ圧延工程で製品厚みまで圧延
する極厚鋼板の製造法において、上記仕上げ圧延工程で
は圧延速度を２００〜３５０mm/secで複数パス圧延し、
かつパス圧延の全てを圧延形状比０．５以上で厚さ方向
に圧下を加えることを特徴とする内部性状の優れた極厚
鋼板の製造方法がある。Further, as disclosed in Japanese Patent Application Laid-Open No. 2-55605, a method for producing an extremely thick steel sheet in which a slab produced by continuous casting is subjected to tenter rolling in a rough rolling step and further rolled to a product thickness in a finish rolling step. In the above finishing rolling step, rolling is performed at a rolling speed of 200 to 350 mm / sec for multiple passes,
In addition, there is a method for manufacturing an extra-thick steel sheet having excellent internal properties, which is characterized in that all pass rolling is performed with a rolling shape ratio of 0.5 or more and a reduction is applied in the thickness direction.
【０００４】[0004]
【発明が解決しようとする課題】上記のような従来技術
においては、スラブ幅方向全体にわたる内質改善のため
の大圧下圧延が不可能である。また、鋼板の圧延工程に
おいては鋼板端部、特に圧延先尾端部が圧延中あるいは
圧延途中の冷却中に過冷却され、当該部の温度が鋼板の
平均温度に対して低下する。このため、圧延先尾端部で
は過大な反力、トルクが生じ、結果として圧延機の能力
が最大限に発揮できない。すなわち、圧下量が圧延先尾
端部の温度降下によって規制されるという問題点があっ
た。従来の内質改善のための圧延法では、このような圧
延先尾端部の温度降下の問題を解決し得ない。In the above-mentioned prior art, large reduction rolling for improving the internal quality over the entire slab width direction is impossible. Further, in the rolling process of the steel sheet, the end portion of the steel sheet, particularly the tail end portion of the steel sheet is supercooled during rolling or during cooling during rolling, and the temperature of the portion falls below the average temperature of the steel sheet. For this reason, excessive reaction force and torque are generated at the leading end of the rolling mill, and as a result, the ability of the rolling mill cannot be maximized. That is, there has been a problem that the amount of reduction is regulated by the temperature drop at the rolling tip end. The conventional rolling method for improving the internal quality cannot solve the problem of the temperature drop at the leading end of the rolling.
【０００５】本発明は、上記従来技術の実情に鑑みてな
されたもので、既存の圧延設備を活用し、スラブ幅方向
全体にわたる内質改善のための大圧下圧延、並びに鋼板
の先尾端部の温度降下に伴う圧下量制約を解消し、圧延
機の能力を最大限に発揮せしめることにより、有効かつ
経済的な内質に優れた極厚鋼板の圧延法を提供すること
を目的とする。The present invention has been made in view of the above-mentioned circumstances of the prior art, utilizing existing rolling equipment, large reduction rolling for improving the internal quality over the entire slab width direction, and the front and rear end portions of the steel sheet. It is an object of the present invention to provide an effective and economical rolling method for extra-thick steel sheets having excellent internal quality by eliminating the restriction on the amount of reduction due to the temperature drop and maximizing the performance of the rolling mill.
【０００６】[0006]
【課題を解決するための手段】本発明の要旨とするとこ
ろは以下の通りである。粗圧延工程で幅出し圧延時にス
ラブ幅方向半分以下の領域を圧下した後、９０°回転し
てスラブ長手方向に圧延を施し、さらに９０°回転させ
て幅方向反対側についても同様にスラブ幅方向半分以下
の領域を圧下した後、９０°回転してスラブ長手方向に
圧延を施し、幅出し圧延完了後のパス圧延を行う時に、
その当該パス実施前に鋼板先端並びに端部を予圧下する
ことを特徴とする内質に優れた極厚鋼板の圧延法であ
る。The gist of the present invention is as follows. During the tenter rolling in the rough rolling process, after rolling down a region of half or less of the slab width direction, the slab is rotated 90 ° to roll in the longitudinal direction of the slab, and further rotated 90 ° to the slab width direction on the opposite side in the same manner. After rolling down less than half the area, it is rotated by 90 ° and rolled in the longitudinal direction of the slab, and when performing pass rolling after completion of tenter rolling,
It is a rolling method for an extremely thick steel sheet having excellent internal quality, characterized in that the front end and the end portion of the steel sheet are pre-pressed before the execution of the pass.
【０００７】[0007]
【作用】以下、本発明の具体的な内容を図面を参照しな
がら説明する。図１は本発明における幅方向全体にわた
る大圧下圧延の圧延方法を示す。連続鋳造スラブを用い
た内質に優れた極厚鋼板の圧延において、粗圧延工程に
おける幅出し圧延過程のいずれかのパス時に、まずスラ
ブ幅方向半分以下の領域を逆転圧延にて圧下する（図１
のａ−１）。ここで、Ｗ1 ≦Ｗ／２（図１のａ−２）。
スラブを水平方向に９０°回転した後（図１のｂ−
１）、引き続いてスラブ長手方向に圧延を実施する（図
１のｂ−２）。さらにスラブを水平方向に９０°回転し
た後、幅方向反対側についても同様にスラブ幅方向半分
以下の領域を逆転圧延にて圧下する（図１のｃ−１）。
ここでＷ2 ≦Ｗ／２（図１のｃ−２）。再度スラブを水
平方向に９０°回転した後（図１のｄ−１）、引き続い
てスラブ長手方向に圧延を実施する（図１のｄ−２）。The specific contents of the present invention will be described below with reference to the drawings. FIG. 1 shows a rolling method of large reduction rolling over the entire width in the present invention. In the rolling of extra-thick steel sheets with excellent internal quality using a continuous casting slab, at the time of any pass of the tentering rolling process in the rough rolling process, first, the region less than half of the slab width direction is rolled by reverse rolling (Fig. 1
A-1). Here, W 1 ≦ W / 2 (a-2 in FIG. 1).
After rotating the slab 90 ° in the horizontal direction (b-
1), followed by rolling in the longitudinal direction of the slab (b-2 in FIG. 1). Further, after rotating the slab 90 ° in the horizontal direction, the region opposite to the half in the slab width direction is also reduced by reverse rolling on the opposite side in the width direction (c-1 in FIG. 1).
Here, W 2 ≦ W / 2 (c-2 in FIG. 1). After rotating the slab 90 ° in the horizontal direction again (d-1 in FIG. 1), rolling is subsequently carried out in the longitudinal direction of the slab (d-2 in FIG. 1).
【０００８】以上のスラブ幅方向並びに長手方向の圧延
の組み合わせにより、結果としてスラブ全幅にわたる大
圧下圧延が可能となる。すなわち、幅方向の逆転圧延に
よりスラブ断面に差厚を生じせしめ、９０°回転後、引
き続いて行う長手方向圧延時の実質圧延幅を小さくする
ことにより、未逆転圧延部の大圧下圧延を行う。しかる
のち、幅方向反対側についても同様の圧延を施すことに
より、結果としてスラブ全幅にわたる大圧下圧延を可能
とするものである。As a result of the combination of rolling in the slab width direction and longitudinal direction as described above, large reduction rolling over the entire width of the slab becomes possible. That is, reverse rolling in the width direction causes a difference thickness in the cross section of the slab, and after 90 ° rotation, the substantial rolling width in the subsequent longitudinal rolling is reduced to perform large reduction rolling in the non-reverse rolling section. After that, the same rolling is performed on the opposite side in the width direction, and as a result, large reduction rolling over the entire width of the slab is possible.
【０００９】なお、幅方向逆転圧延時の圧下量並びにそ
れに引き続く長手方向圧延時の圧下量は、ポロシティー
圧着のためには極力大きくすることが好ましいが、その
量はスラブサイズ、圧延温度、鋼種、圧延機の能力等に
よって決定されるべきものである。The rolling reduction in the width direction reverse rolling and the subsequent rolling reduction in the longitudinal rolling are preferably as large as possible for porosity pressure bonding, but the amount is slab size, rolling temperature, steel grade. It should be decided according to the ability of the rolling mill.
【００１０】図２は本発明における鋼板先尾端の予圧下
圧延方法を示す。先端あるいは後端部を圧延ロールで一
旦噛み込み、鋼板と圧延ロールとの接触長が３０〜５０
０mmとなった時点で圧延ロールを逆転し、当該先尾端部
を逆転方向に圧延することにより、先端あるいは後端部
に予圧下を加える。これを、もう一方の先端あるいは後
端部に同様に繰り返すことにより、図３に示すような鋼
板形状を得る。このように、鋼板先尾端部を予圧下した
後、引き続いて鋼板全長にわたる圧延を行うことによ
り、先尾端部における圧延反力、トルクの跳ね上がりが
防止でき、結果として大圧下圧延が可能となる。FIG. 2 shows a preload rolling method for the leading and trailing edges of the steel sheet according to the present invention. The leading end or the rear end is once bited by the rolling roll, and the contact length between the steel plate and the rolling roll is 30 to 50.
When it reaches 0 mm, the rolling roll is reversed, and the leading end portion is rolled in the reverse direction, so that preload is applied to the leading end or the trailing end. By repeating this similarly for the other front end or rear end, a steel plate shape as shown in FIG. 3 is obtained. In this way, after pre-rolling the steel plate tail end, by rolling over the entire length of the steel plate continuously, rolling reaction force and torque jump at the tail end can be prevented, and as a result large rolling is possible. Become.
【００１１】本発明において、予圧下長を３０〜５００
mmとするのは、以下の理由による。予圧下長が３０mm未
満では、鋼板を圧延ロールに安定して噛み込むことが困
難であることから、予圧下長の下限を３０mmとした。ま
た、予圧下長が５００mmを超えると、歩留の低下が著し
くなるため、その上限を５００mmとした。In the present invention, the preload length is 30 to 500.
The reason for setting mm is as follows. If the preload reduction length is less than 30 mm, it is difficult to stably bite the steel plate into the rolling roll, so the lower limit of the preload reduction length was set to 30 mm. Further, when the pre-pressing length exceeds 500 mm, the yield is remarkably reduced, so the upper limit was made 500 mm.
【００１２】予圧下時の圧下量Δｈ＝ｈi −ｈo （図２
参照）は、特に規定しないが、予圧下効果を十分に発揮
するためには極力予圧下量を大きくとることが好まし
い。但し、極端な大圧下は、逆転圧延時に圧延ロールに
ひびわれ等を生じさせるため、実際の適用上は注意を要
する。また、本発明による予圧下圧延を最終５パス中の
１パス以上５パス以下に限定するのは最終パスに近いほ
ど予圧下の効果を最大限に活用できるためであり、予圧
下の過度の適用は鋼板温度の低下を招くため、その適用
を最大５パスとした。本発明は、内質確保の困難な極厚
鋼板の製造に適用されるものであるが、その効果は特に
板厚８０mm以上の鋼板を製造する場合に有効である。[0012] at the time under the preload of the reduction amount Δh = h i -h o (Fig. 2
Reference) is not particularly specified, but it is preferable to make the preload amount as large as possible in order to fully exert the preload effect. However, an extremely large reduction causes cracks in the rolling rolls during reverse rolling, so caution is required in actual application. Further, the reason why the pre-press rolling according to the present invention is limited to 1 pass or more and 5 passes or less in the final 5 passes is that the closer to the final pass, the effect of the pre-load can be utilized to the maximum extent. Causes a decrease in the temperature of the steel sheet, so its application was set to a maximum of 5 passes. INDUSTRIAL APPLICABILITY The present invention is applied to the production of an extremely thick steel sheet whose internal quality is difficult to secure, and the effect is particularly effective when producing a steel sheet having a sheet thickness of 80 mm or more.
【００１３】[0013]
【実施例】表１に、厚み３００×幅２２００×長さ３７
００（mm）の連続鋳造スラブから板厚１００×幅２６０
０（mm）の鋼板を製造する際、幅出し完了厚２００mmの
条件下で粗圧延を実施した際の従来圧延法と本発明のパ
ススケジュールの比較を示す。[Example] In Table 1, thickness 300 x width 2200 x length 37
Plate thickness 100 x width 260 from a continuous casting slab of 00 (mm)
The following is a comparison between the conventional rolling method and the pass schedule of the present invention when rough rolling is performed under the condition that the width-setting completion thickness is 200 mm when manufacturing a 0 (mm) steel plate.
【００１４】[0014]
【表１】 [Table 1]
【００１５】従来圧延法では、圧延機の制約上、圧下量
を制限せざるをえず、その結果として、最大圧下量が２
０mmとなっている。これに対して、本発明法による幅方
向逆転圧延を施した場合、９０°回転後、引き続いて行
う長手方向圧延時の実質圧延幅を小さくすることによ
り、未逆転圧延部の大圧下圧延が可能となり、結果とし
て、３４mmの圧下量が可能となる（パスNo．４）。同様
に、幅方向反対側についても、本発明法による幅方向逆
転圧延を施した場合、９０°回転後、引き続いて行う長
手方向圧延時の実質圧延幅を小さくすることにより、未
逆転圧延部の大圧下圧延が可能となり、結果として、３
４mmの圧下量が可能となる（パスNo．７）。２回の大圧
下圧延により、スラブ全幅にわたる大圧下圧延が可能と
なった。In the conventional rolling method, there is no choice but to limit the amount of reduction due to the restrictions of the rolling mill, and as a result, the maximum amount of reduction is 2
It is 0 mm. On the other hand, when the width direction reverse rolling according to the method of the present invention is performed, a large reduction rolling of the non-reverse rolling part is possible by reducing the substantial rolling width at the time of 90 ° rotation and subsequent longitudinal rolling. As a result, a reduction amount of 34 mm is possible (pass No. 4). Similarly, on the opposite side in the width direction, when the width direction reverse rolling according to the method of the present invention is performed, after the rotation of 90 °, the substantial rolling width at the time of the longitudinal rolling performed subsequently is reduced, whereby Large reduction rolling is possible, resulting in 3
A rolling amount of 4 mm is possible (pass No. 7). By performing the two large reduction rollings, the large reduction rolling over the entire width of the slab became possible.
【００１６】図４に、粗圧延において幅出しを行ったの
ち、仕上げ圧延で鋼板先尾端の予圧下圧延方法を実施し
た本発明法と従来圧延法の比較を示す。従来圧延法（図
４（ａ））では、鋼板先尾端部でトルクピークが生じて
おり、先尾端部でのトルクオーバーを回避するため、圧
下量を規制せざるを得ず、その結果、鋼板中央部の実効
トルクは４０１Ｔ・ｍとなっている。これに対して、本
発明法による鋼板先尾端予圧下圧延を施した場合（図４
（ｂ））には、先尾端部のトルクピークは解消し、結果
として、平均トルク４９０Ｔ・ｍの大圧下圧延が可能と
なることがわかる。ここで、圧延幅は２６００mm、圧延
温度７５０℃、出側板厚１００mmであり、従来圧延法で
は圧下量１０mmであったものが、本発明法では１３mmの
大圧下圧延が可能となった。FIG. 4 shows a comparison between the method of the present invention in which the pre-rolling method of the leading and trailing edges of the steel sheet is carried out in the finish rolling after the tentering in the rough rolling and the conventional rolling method. In the conventional rolling method (FIG. 4 (a)), a torque peak occurs at the tip end portion of the steel plate, and in order to avoid torque over at the tip end portion, the amount of reduction has to be regulated. The effective torque at the center of the steel plate is 401 T · m. On the other hand, in the case of performing the pre-rolling under the leading edge of the steel sheet by the method of the present invention (Fig.
In (b), it can be seen that the torque peak at the tip end is eliminated, and as a result, large reduction rolling with an average torque of 490 T · m is possible. Here, the rolling width is 2600 mm, the rolling temperature is 750 ° C., the delivery side plate thickness is 100 mm, and the conventional rolling method has a reduction amount of 10 mm, but the present invention method enables large reduction rolling of 13 mm.
【００１７】図５に、本発明と従来技術とによるＵＳＴ
欠陥占積率（％）の比較を示す。横軸は、残存ポロシテ
ィー厚比（ｄk ／ｄo ）であり、ｋパス後の残存ポロシ
ティー厚（ｄk ）と初期ポロシティー厚（ｄo ）との比
を示す。ポロシティーとは連続鋳造スラブの幅方向垂直
断面に切断した際、スラブ中央近傍にある微小な空隙の
ことであり、圧延中に完全に圧着しないと微小な空隙が
残りＵＳＴ欠陥となる。一方、縦軸は、ＵＳＴ欠陥占積
率（％）であり、対象鋼板を２００mmの線分に区分した
時の全区分に対する欠陥の占める割合を示す。尚、対象
板厚は、１００mm、探触子は、周波数２．２５MHz 、直
径２８mmを使用し、探傷感度は、ＳＴＢ−ＧＶ１５−４
を１００％としている。この時の、欠陥部のエコー高さ
を２５％〜５０％に換算してこれを評価する。換算方法
は、１２．５％〜２５％のエコー高さの場合は１区分を
１／２区分とし、５０〜１００％のエコー高さの場合は
１区分を２区分とする。FIG. 5 shows a UST according to the present invention and the prior art.
The comparison of the defect space factor (%) is shown. The horizontal axis represents the residual porosity thickness ratio (d k / d o ), which represents the ratio of the residual porosity thickness (d k ) after k passes and the initial porosity thickness (d o ). Porosity is a minute void in the vicinity of the center of the slab when it is cut into a cross section perpendicular to the width direction of a continuously cast slab, and if not completely pressed during rolling, the minute void remains and becomes a UST defect. On the other hand, the vertical axis is the UST defect space factor (%), which is the ratio of defects to all the divisions when the target steel sheet is divided into 200 mm line segments. The target plate thickness is 100 mm, the probe has a frequency of 2.25 MHz and a diameter of 28 mm, and the flaw detection sensitivity is STB-GV15-4.
Is 100%. At this time, the echo height of the defective portion is converted into 25% to 50% and evaluated. As for the conversion method, when the echo height is 12.5% to 25%, one division is divided into ½ divisions, and when the echo height is 50 to 100%, one division is divided into two divisions.
【００１８】従来圧延法では、ｄk ／ｄo が０．１９〜
０．２１のため、ＵＳＴ欠陥占積率（％）が７０％〜９
０％である。これに対して、本発明法は、粗圧延工程で
の逆転幅出し圧延後の大圧下によるスラブ全体にわたる
内質改善と、仕上げ圧延工程での鋼板先尾端部の予圧下
（仕上げ最終３パスに適用）後の温度降下を補償した大
圧下により、ｄk ／ｄo が０．１４〜０．１５まで減少
し、結果として、ＵＳＴ欠陥占積率（％）が１５％以下
となった。In the conventional rolling method, d k / d o is 0.19 to
Since it is 0.21, the UST defect space factor (%) is 70% to 9
It is 0%. On the other hand, the method of the present invention is to improve the internal quality of the entire slab by large reduction after reverse tentering rolling in the rough rolling process, and to pre-load the steel plate tip end portion in the finish rolling process (finishing final 3 passes). Applied), the d k / d o was reduced to 0.14 to 0.15, and as a result, the UST defect space factor (%) was 15% or less.
【００１９】[0019]
【発明の効果】本発明により、幅方向全体にわたる大圧
下圧延が可能となり、且つ鋼板先尾端部の温度降下を補
償した大圧下圧延が可能となったため、ＵＳＴ欠陥の少
ない内質に優れた極厚鋼板の製造が可能となった。EFFECTS OF THE INVENTION According to the present invention, large reduction rolling over the entire width direction is possible, and large reduction rolling that compensates for the temperature drop at the front and rear ends of the steel sheet is possible. Therefore, the internal quality with few UST defects is excellent. It became possible to manufacture extremely thick steel plates.
【図１】本発明の圧延法の各工程を順次示す説明図。FIG. 1 is an explanatory view sequentially showing each step of a rolling method of the present invention.
【図２】本発明における鋼板端部の予圧下方法を示す説
明図。FIG. 2 is an explanatory diagram showing a method of preloading a steel sheet end portion according to the present invention.
【図３】図２により得られる鋼板形状を示す側面図。FIG. 3 is a side view showing a steel plate shape obtained in FIG.
【図４】粗圧延で幅出し後仕上げ圧延で鋼板端部の予圧
下圧延を実施した場合の本発明法と従来例との比較を示
す説明図。FIG. 4 is an explanatory view showing a comparison between the method of the present invention and a conventional example in the case where the pre-rolling of the steel plate end portion is carried out by roughing and finish rolling in rough rolling.
【図５】本発明と従来例によるＵＳＴ欠陥占積率の比較
を示すグラフ。FIG. 5 is a graph showing a comparison of UST defect space factors according to the present invention and a conventional example.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−177807（ＪＰ，Ａ) 特開 昭58−61901（ＪＰ，Ａ) 特開 平５−76907（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-57-177807 (JP, A) JP-A-58-61901 (JP, A) JP-A-5-76907 (JP, A)
Claims (2)
向半分以下の領域を圧下した後、９０°回転してスラブ
長手方向に圧延を施し、さらに９０°回転させて幅方向
反対側についても同様にスラブ幅方向半分以下の領域を
圧下した後、９０°回転してスラブ長手方向に圧延を施
し、幅出し圧延完了後のパス圧延を行う時に、その当該
パス実施前に鋼板先端並びに端部を予圧下することを特
徴とする内質に優れた極厚鋼板の圧延法。1. In the rough rolling step, when the tenter rolling is performed in the tenter rolling, a region less than half of the width direction of the slab is rolled down, then rotated by 90 ° to roll in the longitudinal direction of the slab, and further rotated by 90 ° on the opposite side in the width direction. Similarly, after rolling down the area of less than half of the slab width direction, rolling is performed in the longitudinal direction of the slab by rotating 90 °, and when performing pass rolling after completion of tenter rolling, the steel plate tip and end portion before the pass is performed. Rolling method for extra-thick steel sheets with excellent internal quality, characterized by preloading
ス中の１パス以上５パス以下のパスを行う時に、その当
該パス実施前に鋼板先端並びに端部を３０mm以上５００
mm以下の長さにわたって予圧下することを特徴とする請
求項１記載の内質に優れた極厚鋼板の圧延法。2. When performing a pass of 1 to 5 passes in the final 5 passes of finish rolling after completion of tenter rolling, the tip and end of the steel sheet should be 30 mm or more and 500 or more before the pass.
The method for rolling extra-thick steel sheet with excellent internal quality according to claim 1, wherein pre-loading is performed over a length of not more than mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4063131A JP2530406B2 (en) | 1992-03-19 | 1992-03-19 | Rolling method for extra-thick steel plates with excellent internal quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4063131A JP2530406B2 (en) | 1992-03-19 | 1992-03-19 | Rolling method for extra-thick steel plates with excellent internal quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05261403A JPH05261403A (en) | 1993-10-12 |
| JP2530406B2 true JP2530406B2 (en) | 1996-09-04 |
Family
ID=13220412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4063131A Expired - Fee Related JP2530406B2 (en) | 1992-03-19 | 1992-03-19 | Rolling method for extra-thick steel plates with excellent internal quality |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2530406B2 (en) |
-
1992
- 1992-03-19 JP JP4063131A patent/JP2530406B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05261403A (en) | 1993-10-12 |
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