JP2974521B2 - Mold for continuous casting of thin cast slab and surface processing method thereof - Google Patents

Mold for continuous casting of thin cast slab and surface processing method thereof

Info

Publication number
JP2974521B2
JP2974521B2 JP4288892A JP28889292A JP2974521B2 JP 2974521 B2 JP2974521 B2 JP 2974521B2 JP 4288892 A JP4288892 A JP 4288892A JP 28889292 A JP28889292 A JP 28889292A JP 2974521 B2 JP2974521 B2 JP 2974521B2
Authority
JP
Japan
Prior art keywords
mold
diameter
continuous casting
thin cast
drum
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
Application number
JP4288892A
Other languages
Japanese (ja)
Other versions
JPH06134553A (en
Inventor
義盛 福田
重典 田中
英麿 竹内
安夫 松原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Nippon Steel Corp
Original Assignee
Mitsubishi Heavy Industries Ltd
Nippon Steel Corp
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 Mitsubishi Heavy Industries Ltd, Nippon Steel Corp filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP4288892A priority Critical patent/JP2974521B2/en
Publication of JPH06134553A publication Critical patent/JPH06134553A/en
Application granted granted Critical
Publication of JP2974521B2 publication Critical patent/JP2974521B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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】本発明は移動鋳型鋳造装置、たと
えば内部に水冷機構を備えた一対の冷却ドラムを使用す
るツインドラム方式、一本の冷却ドラムを使用する単ド
ラム方式、あるいは冷却ドラムとベルトとの間に湯溜り
部を形成するドラム−ベルト方式等の薄肉鋳片鋳造装置
における鋳型の表面形状およびその表面加工方法に関す
る。
The present invention relates to a moving mold casting apparatus, for example, a twin drum system using a pair of cooling drums having a water cooling mechanism inside, a single drum system using one cooling drum, or a cooling drum. The present invention relates to a surface shape of a mold in a thin cast slab casting apparatus of a drum-belt type or the like which forms a pool portion between the mold and a belt, and a surface processing method thereof.

【0002】[0002]

【従来の技術】同期式連続鋳造方法は、たとえば冷却ド
ラムとサイド堰で構成した湯溜り部内の溶融金属(溶
湯)を冷却ドラムで冷却凝固して凝固シェルを形成し、
直接最終形状に近い1〜10mm程度の肉厚をもつ薄肉鋳
片を製造する方法であり、従って、表面性状の良好な薄
肉鋳片を製造することが極めて重要である。
2. Description of the Related Art In a synchronous continuous casting method, for example, a molten metal (molten metal) in a basin constituted by a cooling drum and side dams is cooled and solidified by a cooling drum to form a solidified shell.
This is a method for producing a thin cast slab having a wall thickness of about 1 to 10 mm, which is close to the final shape, and therefore, it is extremely important to produce a thin cast slab having good surface properties.

【0003】かかる鋳造においては、鋳片の表面性状を
安定して高水準に維持することが重要な課題であり、こ
のため、凝固シェルの均一生成を達成する手段として、
たとえば冷却ドラムと凝固シェルとの間に断熱層となる
エアギャップを形成するように、冷却ドラム周面に多数
の窪みを設ける技術が特開昭60−18449号公報に
開示されている。
[0003] In such casting, it is important to maintain the surface properties of the slab stably at a high level. Therefore, as a means for achieving uniform formation of a solidified shell,
For example, Japanese Patent Application Laid-Open No. Sho 60-18449 discloses a technique in which a large number of depressions are provided on the peripheral surface of a cooling drum so as to form an air gap serving as a heat insulating layer between the cooling drum and a solidified shell.

【0004】またかかる技術を改良したものとして、か
ゝる窪みの深さ、直径、窪みの相互間距離、窪みのモチ
ーフなどを特定した技術が特開昭64−83342号公
報に開示されている。さらに、窪みの加工手段として、
ショットブラスト法電解法、放電加工法、電子ビーム加
工法などの手段が特開昭62−254953号公報に開
示されている。
As an improvement of this technique, Japanese Patent Laid-Open Publication No. 64-83342 discloses a technique in which the depth, diameter, distance between recesses, and motifs of the recesses are specified. . Furthermore, as a means for processing the dent,
Means such as a shot blasting electrolysis method, an electric discharge machining method, and an electron beam machining method are disclosed in JP-A-62-254953.

【0005】[0005]

【発明が解決しようとする課題】移動鋳型式連続鋳造機
を用いて好ましい薄肉鋳片を継続して得るためには、鋳
型、たとえば冷却ドラムの外周面に特にショットブラス
ト法によって窪みを加工する場合、その窪みの大きさや
分布が極めて重要となる。溶湯と接する冷却ドラム外周
面ではドラムに刻設された窪み部より凝固が開始する
が、窪みの直径が小さすぎると凝固開始点となり得な
い。そのため凝固の不均一が起こり、割れの発生や湯皺
起因による表面凝固むらを生じる。
In order to continuously obtain a preferable thin cast slab by using a moving mold type continuous casting machine, it is necessary to form a hollow on the outer peripheral surface of a mold, for example, a cooling drum, particularly by a shot blast method. The size and distribution of the depressions are extremely important. On the outer peripheral surface of the cooling drum that is in contact with the molten metal, solidification starts from the depression formed in the drum, but if the diameter of the depression is too small, it cannot be a solidification start point. Therefore, non-uniform solidification occurs, causing cracks and uneven surface solidification due to hot water wrinkles.

【0006】かかる凝固開始点を増加させ、均一性を助
長させるため、鋼球径をさらに大きくしてドラム表面に
刻設すると、窪み部が数個の大きな集合体となったり、
ドラム幅方向に一定ピッチで大きな起伏が発生し、この
ドラム表面で溶湯を鋳造すると鋳片表面に大きな湯しわ
が発生する。また冷却ドラム外周面に平坦な部分が連続
的にあると、平坦部と窪み部の境界に割れを生じたり、
凝固組織むらとして残存する。従って窪み径を必要以上
に大きくせず、かつ鋼球の大きさ、分布を適正に刻設す
ることが必要となるが、従来技術では打刻時の鋼球の大
きさ分布に関する明確な示唆はない。
[0006] In order to increase the solidification starting point and promote uniformity, if the steel ball diameter is further enlarged and cut on the drum surface, the hollow portion becomes a large aggregate of several pieces,
Large undulations occur at a constant pitch in the width direction of the drum, and when the molten metal is cast on the surface of the drum, large wrinkles are generated on the slab surface. Also, if there is a continuous flat part on the outer peripheral surface of the cooling drum, cracks may occur at the boundary between the flat part and the depression,
It remains as uneven coagulated tissue. Therefore, it is necessary not to make the depression diameter unnecessarily large, and it is necessary to appropriately cut the size and distribution of the steel balls.However, in the prior art, there is no clear suggestion regarding the size distribution of the steel balls at the time of stamping. Absent.

【0007】本発明は薄肉鋳片の連続鋳造に際し、ショ
ットブラスト法によって冷却鋳型の窪みの分布を加工す
る場合のかゝる従来技術の問題点を解決するもので、こ
れによって表面に割れや光沢むらのない鋳片を製造する
ことを可能とするものである。
SUMMARY OF THE INVENTION The present invention solves the problems of the prior art when processing the distribution of depressions in a cooling mold by shot blasting in continuous casting of thin cast slabs. This makes it possible to manufacture cast slabs free of cracks.

【0008】[0008]

【課題を解決するための手段】本発明は、このような問
題点を解決するために、薄肉鋳片の同期式連続鋳造装置
の移動鋳型の表面が、該移動鋳型の周面積の90%以上
に亘り、ショットブラスト法により刻設された1cm2
り50〜200個の直径0.4〜1.0mmの円形または
長円形状の開口を有する窪みと直径0.3mm以下の窪み
からなり、かつ残部表面が表面粗さ10μm以下の平坦
部で構成された鋳型を特徴とし、また、連続鋳造装置の
移動移型表面に直径の異なる2種類の鋼球を混合してシ
ョットブラストを施すことにより上記鋳型表面を加工す
ることを特徴とする。
According to the present invention, in order to solve the above-mentioned problems, the surface of a moving mold of a synchronous continuous casting apparatus for thin cast slabs is required to have a surface area of 90% or more of the moving mold. to over consists recess and the diameter 0.3mm or less of the recess having openings of a circular or oval shape of the engraved been 1 cm 2 per 50 to 200 in diameter 0.4~1.0mm by shot blasting, and The remaining surface is characterized by a mold composed of a flat portion having a surface roughness of 10 μm or less, and the above-mentioned process is performed by mixing two types of steel balls having different diameters on a moving transfer surface of a continuous casting apparatus and performing shot blasting. It is characterized by processing the mold surface.

【0009】以下、本発明についてさらに詳細に述べ
る。本発明は薄肉鋳片の連続鋳造用鋳型の表面に2種類
の鋼球を混合してショットすることによって、前述のよ
うな冷却鋳型表面を形成するものであるが、これにより
極めて容易に健全な鋳片を得ることができる。本発明に
おいて、初期の窪みとは窪みが形成されていない平滑な
冷却鋳型の表面に形成された窪みのことである。初期の
窪みは0.4mm〜1.0mmの窪みを50〜200個/cm
2 の範囲で分布するとともに、残部表面に0.3mm以下
の窪みをほぼ全面に分布する。
Hereinafter, the present invention will be described in more detail. The present invention is to form the cooling mold surface as described above by mixing and shot two types of steel balls on the surface of a continuous casting mold for thin cast slabs. A slab can be obtained. In the present invention, the initial depression is a depression formed on the surface of a smooth cooling mold where no depression is formed. The initial dent is 50-200 dents / cm with 0.4mm-1.0mm dents.
In addition to the distribution in the range of 2 , a dent of 0.3 mm or less is distributed over the entire surface on the remaining surface.

【0010】凝固開始点となるためには、大きな窪みは
0.4mm以上であることが必要である。また小さな径の
窪みは鋳型表面の大きな窪み部との冷却むらを小さくす
るため、0.3mm以下が効果的である。さらに鋳型表面
の平坦部は表面組織むらを防ぐ意味から、出来るかぎり
少ない面積がよく、少なくとも10%以下が望ましい。
In order to become a solidification starting point, a large depression needs to be 0.4 mm or more. In addition, a small-diameter dent is effective at 0.3 mm or less in order to reduce cooling unevenness with a large dent on the mold surface. Further, the flat portion of the mold surface should have an area as small as possible from the viewpoint of preventing surface texture unevenness, and is desirably at least 10% or less.

【0011】本発明における平坦部の面積率とは、下記
(1)式によって定義される。 ただし、 S ;冷却ドラムの周面積 Si;冷却ドラム平坦部面積 である。
The area ratio of the flat portion in the present invention is defined by the following equation (1). Here, S: peripheral area of cooling drum Si: flat area of cooling drum

【0012】また平坦部とは表面粗さが10μm以下の
部分とした。このとき、平坦部の面積率は、簡易的にド
ラム表面の拓本を画像処理することで測定できる。即ち
ドラム表面にカーボンスプレイを塗布させ、魚拓方式で
拓本を取り、黒くなった部位の面積率を定量化する。本
発明において、上記ショットブラストを施して、上記冷
却鋳型に所要の窪みを形成させるとき、0.4mm以上の
大径d1 を形成するためのショットブラストD1 と0.
3mm以下の窪みd2 を形成するためのショットブラスト
2 を混合させて加工を行う。平坦な表面を有する冷却
鋳型に、ショットブラストを施すことによって、2種の
大小の窪みを形成するためにはほぼランダムに衝突する
必要がある。
The flat portion is a portion having a surface roughness of 10 μm or less. At this time, the area ratio of the flat portion can be measured by simply performing image processing on the rubbed copy of the drum surface. That is, a carbon spray is applied to the drum surface, and a rubbing book is obtained by a fish cultivation method, and the area ratio of a blackened portion is quantified. In the present invention, when the above-described shot blast is performed to form a required depression in the cooling mold, the shot blast D 1 and the .0 for forming a large diameter d 1 of 0.4 mm or more.
Processing is performed by mixing shot blast D 2 for forming a recess d 2 of 3 mm or less. In order to form two types of large and small depressions by performing shot blasting on a cooling mold having a flat surface, it is necessary to collide almost randomly.

【0013】同一ショット径で加工すると、窪みの分布
はある範囲内に正規分布するため、2種の分布を形成す
ることはできない。そこで、ショット径を2種にするこ
とで窪みの分布を2種類にでき、本発明例に沿った分布
が再現できる。この場合、大径D1 と小径D2 はドラム
表面の素材にランダムに打刻するために、大径D1 ショ
ットと小径D2 ショットの個数を(2)式で満足する範
囲にすることが好ましい。
When processing is performed with the same shot diameter, the distribution of the depressions is normally distributed within a certain range, so that two types of distributions cannot be formed. Therefore, by using two types of shot diameters, the dent distribution can be made two types, and the distribution according to the example of the present invention can be reproduced. In this case, since the large diameter D 1 and the small diameter D 2 are randomly stamped on the material on the drum surface, the number of the large diameter D 1 shots and the small diameter D 2 shots should be within a range satisfying the equation (2). preferable.

【0014】 3%≦D1 /(D1 +D2 )≦40% …(2) この割合はドラム表面の材質によって異なるが、たとえ
ばCu鋳型に0.5〜2mmのNiメッキが施されている
場合、この比が3%より小さいと凝固核となる0.4mm
以上の窪みの個数が少なく、不均一凝固を起こし、割れ
が発生する。一方、40%より大きくなると0.4mm以
上の窪みが連続したり、縦筋状の大きな起伏が発生し、
鋳片表面性状を悪化させる。
3% ≦ D 1 / (D 1 + D 2 ) ≦ 40% (2) Although this ratio varies depending on the material of the drum surface, for example, a Cu mold is plated with Ni of 0.5 to 2 mm. In this case, if this ratio is smaller than 3%, the solidification nucleus becomes 0.4 mm.
The number of the above depressions is small, causing non-uniform solidification and cracking. On the other hand, when it is larger than 40%, pits of 0.4 mm or more are continuous or large vertical undulations occur,
Deteriorates slab surface properties.

【0015】またショット径が0.15mm未満では、シ
ョットの運動エネルギーが小さく、有効な窪みが得にく
い。したがって、ショット径D1 とD2 は(3)式、
(4)式を満足することが好ましい。 0.50mm≦D1 ≦1.1mm …(3) 0.15mm≦D2 ≦0.4mm …(4) このように適性範囲で窪みを形成した冷却鋳型により鋳
片を鋳造すると、鋳片の表面微細割れおよび光沢むらを
同時に防止することができる。
If the shot diameter is less than 0.15 mm, the kinetic energy of the shot is small, and it is difficult to obtain an effective depression. Therefore, the shot diameters D 1 and D 2 are given by equation (3),
It is preferable to satisfy the expression (4). 0.50 mm ≦ D 1 ≦ 1.1 mm (3) 0.15 mm ≦ D 2 ≦ 0.4 mm (4) When the cast slab is cast by the cooling mold having the recess formed in the appropriate range as described above, Surface fine cracks and uneven gloss can be prevented at the same time.

【0016】またこれらの窪みは鋳造量とともに磨耗す
ることから磨耗に応じ、再加工する必要がある。なお、
窪み加工は、窒素雰囲気下で行うことが好ましい。これ
によって、加工時にロール表面温度が上昇して酸化が促
進されることを防止することができる。
Further, since these dents wear with the amount of casting, it is necessary to rework according to the wear. In addition,
It is preferable to perform the depression processing under a nitrogen atmosphere. Thereby, it is possible to prevent the roll surface temperature from increasing at the time of processing and promoting oxidation.

【0017】[0017]

【作用】本発明者らは冷却鋳型の窪みと鋳片表面割れお
よび表面凝固むらを種々検討したところ、凝固核として
必要な大径の窪みをある範囲の量で形成する必要がある
ことを見出した。さらに、本発明者らはこれらの大きな
径の間隙に小さな径の窪みを形成することにより、鋳片
表面の光沢むらの解消できることを見出した。
The present inventors have conducted various studies on the depression of the cooling mold, the surface cracks of the slab, and the uneven surface solidification, and found that it is necessary to form a large-diameter depression required as a solidification nucleus in a certain range. Was. Furthermore, the present inventors have found that by forming a small-diameter recess in these large-diameter gaps, it is possible to eliminate uneven gloss on the slab surface.

【0018】図3は窪みの断面形状を示し、大きなショ
ットディンプルにより大きくより深い窪みA1 (直径d
1 、深さl1 )が、小さなショットディンプルによりよ
り小さく浅い窪みA2 (直径d2 、深さl2 )が形成さ
れる。大きな窪みA1 は溶鋼表面と接することにより、
凝固核が生成し、均一凝固を助長し、まわりの小さな窪
みA2 はドラムと凝固シェル間のガスギャップを大きく
して鋳片表面を緩冷却化し、さらに凝固核に必要な窪み
1 とまわりの窪みA2 との冷速差を小さくすること
で、表面の凝固むらが解消できることを確認した。
FIG. 3 shows the cross-sectional shape of the depression, where a large shot dimple causes a large and deep depression A 1 (diameter d).
1 , depth l 1 ) is smaller and shallower depression A 2 (diameter d 2 , depth l 2 ) is formed by the small shot dimple. Large recess A 1 is by contact with the molten steel surface,
Solidification nuclei are generated and promote uniform homogenization, and the small depression A 2 around increases the gas gap between the drum and the solidification shell to slowly cool the slab surface, and further reduces the depression A 1 required for the solidification nuclei. by reducing the cooling rate difference between the recesses a 2 of, it was confirmed that the solidification unevenness of the surface can be solved.

【0019】また窪みA1 ,A2 によってドラムと凝固
シェル間のエアギャップを増大させ緩冷却作用によっ
て、鋳片の表面割れが防止できることを確認した。この
結果を図1に示す。図1は次の条件によって得られたも
のである。先ずドラム幅1300mm、径1200mm、表
面にNiメッキを施した双ドラム式連続鋳造機を用い、
鋼種SUS304の溶湯を急冷凝固して、鋳片を80m
/分で引き抜き、厚み2.3mmの鋳片を得た。
It has also been confirmed that the depressions A 1 and A 2 increase the air gap between the drum and the solidified shell, and that the surface of the slab can be prevented by slow cooling. The result is shown in FIG. FIG. 1 was obtained under the following conditions. First, using a twin-drum continuous caster with a drum width of 1300 mm, a diameter of 1200 mm, and Ni plating on the surface,
Rapidly solidifies the molten metal of steel type SUS304 and reduces the slab to 80 m
Per minute to obtain a slab having a thickness of 2.3 mm.

【0020】上記冷却ドラム表面には、ショットブラス
トによって平坦部の90%以上の部分に窪みを形成させ
た。この部分に0.15mmの窪みを形成させたところ、
窪みが凝固核として働かず、鋳片表面に割れが発生し
た。そこで、冷却ドラム表面に次の条件によりショット
ブラストを施した。すなわち、空圧投射式ブラスターを
用い、径が0.15,0.20,0.25,0.30,
0.35,0.40のいずれかの鋼球(マルテンサイ
ト)と径が0.60,0.65,0.75,0.85,
0.90,1.10mmのいずれかの鋼球を、投射空圧;
3.6〜10kg/cm2 、1回の投射幅20mmによって図
2に示すような個数率で変化させて窪みを形成した。
On the surface of the cooling drum, a depression was formed in a portion of 90% or more of the flat portion by shot blasting. When a dent of 0.15 mm was formed in this part,
The depression did not work as a solidification nucleus, and cracks occurred on the slab surface. Therefore, shot blast was performed on the surface of the cooling drum under the following conditions. That is, using a pneumatic projection type blaster, the diameter is 0.15, 0.20, 0.25, 0.30,
Any of steel balls (martensite) of 0.35, 0.40 and diameters of 0.60, 0.65, 0.75, 0.85
Any steel ball of 0.90 or 1.10 mm is projected air pressure;
A depression was formed by changing the number ratio as shown in FIG. 2 according to 3.6 to 10 kg / cm 2 and a single projection width of 20 mm.

【0021】以上のように表面を加工した冷却ドラムに
より上記と同様な鋳造条件で鋳片を製造し、得られた表
面の表面割れ発生量を調査した。図2に示すように割れ
および光沢むらのない領域は、0.4mm以上の窪みが5
0〜200個/cm2 で分布し、且つ0.3mm以下の凹み
からなり、全体の90%以上刻設された部位であること
がわかった。
A slab was manufactured under the same casting conditions as above using the cooling drum whose surface was processed as described above, and the amount of occurrence of surface cracks on the obtained surface was examined. As shown in FIG. 2, the area without cracks and uneven gloss has five pits of 0.4 mm or more.
It was found that the region was distributed at 0 to 200 / cm 2, was formed of dents of 0.3 mm or less, and was engraved at 90% or more of the whole.

【0022】ここで、窪みの径が1mmより大きくなる
と、冷延後窪み部に対応した部分が光沢むらとして残存
するため0.4〜1.0mmの範囲とした。
Here, when the diameter of the depression is larger than 1 mm, the portion corresponding to the depression after cold rolling remains as uneven gloss, so that the diameter is set in the range of 0.4 to 1.0 mm.

【0023】[0023]

【実施例】先ず、本発明で用いる連続鋳造機について図
4で説明すると、該連続鋳造機は冷却ドラム1、1を平
行にかつ逆方向に回転するように配置し、該冷却ドラム
1、1の両端面にサイド堰2、2を設けて湯溜り部4を
構成し、該湯溜り部内の溶湯5を冷却ドラム1、1の回
転によって冷却しつつ薄肉鋳片Sを鋳造するようになっ
ている。またサイド堰2、2は冷却ドラム1、1の両端
面に押しつけられ、冷却ドラムの回転による磨耗によっ
てシール状態を維持して湯漏れを防止している。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a continuous casting machine used in the present invention will be described with reference to FIG. 4. In the continuous casting machine, cooling drums 1, 1 are arranged so as to rotate in parallel and in opposite directions. Side dams 2 and 2 are provided on both end surfaces of the pool to form a pool basin 4, and a thin cast slab S is cast while cooling the molten metal 5 in the pool basin by the rotation of the cooling drums 1 and 1. I have. The side weirs 2 and 2 are pressed against both end surfaces of the cooling drums 1 and 1 to maintain a sealed state by wear due to rotation of the cooling drums, thereby preventing hot water leakage.

【0024】かかる装置の鋳型の表面性状を表1に示す
ように変えて、ステンレス鋼SUS304の組成を持
ち、温度1500℃の溶鋼から80m/分の鋳造速度で
肉厚2.3mm、板幅800mmの薄肉鋳片を鋳造した。表
1に記載のNO1−1から1−5が比較例であり、NO
1−6から1−10が本発明例である。表1に示す通
り、本発明法で鋳造した鋳片表面には微細割れがなく、
また光沢むらの発生もなかった。
The surface properties of the mold of this apparatus were changed as shown in Table 1 and the composition of stainless steel SUS304 was used. The molten steel at a temperature of 1500 ° C. was cast at a casting speed of 80 m / min. Was cast. NO1-1 to 1-5 described in Table 1 are comparative examples.
1-6 to 1-10 are examples of the present invention. As shown in Table 1, the surface of the slab cast by the method of the present invention has no fine cracks,
No uneven gloss was observed.

【0025】すなわち0.4mm以上の大径部から凝固が
開始し、断面方向の凝固均一性がよくなり、微細割れを
なくすことができた。またほぼ全面に窪みを形成するこ
とで大径部とその他の部位の凝固むらを軽減でき、結果
として冷延板の光沢むらを皆無とすることができた。N
O1−1および1−2は0.4mm以上の大径が少なく、
凝固開始点が少ないことによって凝固不均一が過大とな
り、微細割れが発生した。また、NO1−3は0.4mm
以上の窪みの個数は適正であったが、ドラム表面に平坦
部が多く、光沢むらが発生した。さらに、NO1−4お
よび1−5は、0.4mm以上の大径が重なりあって、大
きな窪み群となったり、縦方向に窪みの筋ができたりし
て、光沢むらが発生した。
That is, solidification started from a large diameter portion of 0.4 mm or more, solidification uniformity in the cross-sectional direction was improved, and fine cracks could be eliminated. In addition, by forming a dent on almost the entire surface, uneven solidification of the large-diameter portion and other portions could be reduced, and as a result, gloss unevenness of the cold-rolled sheet could be completely eliminated. N
O1-1 and 1-2 have a small diameter of 0.4 mm or more,
Due to the small number of solidification starting points, solidification non-uniformity became excessive, and fine cracks occurred. NO1-3 is 0.4mm
Although the number of the above depressions was proper, there were many flat portions on the drum surface and uneven gloss was generated. Further, in NOs 1-4 and 1-5, large diameters of 0.4 mm or more were overlapped to form a large depression group, or a streak of depressions was formed in the vertical direction, resulting in uneven gloss.

【0026】[0026]

【発明の効果】以上述べたごとく、本発明によれば冷却
ドラム表面の窪みを割れおよび光沢むらのない窪み分布
に形成することができるので、加工の工期および費用の
削減などが可能となり、その工業的効果は大きい。
As described above, according to the present invention, the dents on the surface of the cooling drum can be formed in a dent distribution without cracks and uneven gloss, so that the processing period and cost can be reduced. The industrial effect is great.

【図面の簡単な説明】[Brief description of the drawings]

【図1】0.4mm以上の窪みの数とドラム表面の窪み部
面積率の割れ、光沢むらの最適範囲部を示す図である。
FIG. 1 is a diagram showing the number of pits of 0.4 mm or more, cracks in the pit area ratio on the drum surface, and the optimum range of gloss unevenness.

【図2】0.4mm以上の窪みの数におよぼすショット大
径D1 と小径D2 の個数比の最適範囲部を示す図であ
る。
FIG. 2 is a view showing an optimum range portion of a number ratio of a large shot diameter D 1 and a small diameter D 2 to the number of depressions of 0.4 mm or more.

【図3】ドラム表面の窪みの形状を示す図である。FIG. 3 is a diagram showing a shape of a depression on a drum surface.

【図4】本発明を実施する双ドラム式連続鋳造機の斜視
図である。
FIG. 4 is a perspective view of a twin-drum continuous caster embodying the present invention.

【符号の説明】[Explanation of symbols]

1…冷却ドラム 2…サイド堰 3…溶湯吐出ノズル 4…湯溜り部 5…溶湯 D1 …ショット大径 D2 …ショット大径 S…薄肉鋳片 d1 …ショット大径による窪み径 d2 …ショット小径による窪み径 l1 …ショット大径による窪み深さ l2 …ショット小径による窪み深さ1 ... cooling drum 2 ... side weirs 3 ... melt discharge nozzle 4 ... basin portion 5 ... molten metal D 1 ... shot diameter D 2 ... shot diameter S ... thin slab d 1 ... diameter d 2 indentations by shot large ... Depression diameter due to small shot diameter l 1 … Depth depth due to large shot diameter l 2 … Depth depth due to small shot diameter

───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹内 英麿 山口県光市大字島田3434番地 新日本製 鐵株式会社光製鐵所内 (72)発明者 松原 安夫 山口県光市大字島田3434番地 新日本製 鐵株式会社光製鐵所内 (56)参考文献 特開 平5−329668(JP,A) 特開 平5−261487(JP,A) 特開 平3−110044(JP,A) 特開 昭60−184449(JP,A) 特開 平6−39501(JP,A) 特開 平5−7997(JP,A) (58)調査した分野(Int.Cl.6,DB名) B22D 11/06 330 B22D 11/06 340 B24C 1/10 C21D 7/06 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidemaro Takeuchi 3434 Shimada, Hikari-shi, Yamaguchi Prefecture Nippon Steel Corporation Hikari Works (72) Inventor Yasuo Matsubara 3434 Shimada, Hikari-shi, Hikari-shi, Yamaguchi New Japan (56) References JP-A-5-329668 (JP, A) JP-A-5-261487 (JP, A) JP-A-3-110044 (JP, A) JP-A-60 184449 (JP, A) JP-A-6-39501 (JP, A) JP-A-5-7997 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B22D 11/06 330 B22D 11/06 340 B24C 1/10 C21D 7/06

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 薄肉鋳片の同期式連続鋳造装置の移動鋳
型の表面が、該移動鋳型の周面積の90%以上に亘り、
ショットブラスト法により刻設された1cm2当り50〜
200個の直径0.4〜1.0mmの円形または長円形状
の開口を有する窪みと直径0.3mm以下の窪みからな
り、かつ残部表面が表面粗さ10μm以下の平坦部で構
成されたことを特徴とする薄肉鋳片の連続鋳造用鋳型。
The surface of a moving mold of a synchronous continuous casting apparatus for thin cast slabs covers at least 90% of the peripheral area of the moving mold.
1cm 2 per 50, which is engraved by shot blasting
200 hollows having a circular or oval shape with a diameter of 0.4 to 1.0 mm and hollows having a diameter of 0.3 mm or less, and the remaining surface was constituted by flat portions having a surface roughness of 10 μm or less. A continuous casting mold for thin cast slabs characterized by the following.
【請求項2】 薄肉鋳片の同期式連続鋳造装置の移動鋳
型の表面に、ショットブラスト法により直径の異なる2
種類の鋼球を混合して投射することを特徴とする薄肉鋳
片の連続鋳造用鋳型の表面加工方法。
2. The surface of a moving mold of a synchronous continuous casting apparatus for thin cast slabs having different diameters by a shot blast method.
A method for processing a surface of a casting mold for continuous casting of thin cast slabs, wherein different types of steel balls are mixed and projected.
JP4288892A 1992-10-27 1992-10-27 Mold for continuous casting of thin cast slab and surface processing method thereof Expired - Lifetime JP2974521B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4288892A JP2974521B2 (en) 1992-10-27 1992-10-27 Mold for continuous casting of thin cast slab and surface processing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4288892A JP2974521B2 (en) 1992-10-27 1992-10-27 Mold for continuous casting of thin cast slab and surface processing method thereof

Publications (2)

Publication Number Publication Date
JPH06134553A JPH06134553A (en) 1994-05-17
JP2974521B2 true JP2974521B2 (en) 1999-11-10

Family

ID=17736133

Family Applications (1)

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Country Status (1)

Country Link
JP (1) JP2974521B2 (en)

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