JP2001321895A - Drum for thin cast slab continuous caster and method for continuously casting thin cast slab - Google Patents
Drum for thin cast slab continuous caster and method for continuously casting thin cast slabInfo
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- JP2001321895A JP2001321895A JP2000140315A JP2000140315A JP2001321895A JP 2001321895 A JP2001321895 A JP 2001321895A JP 2000140315 A JP2000140315 A JP 2000140315A JP 2000140315 A JP2000140315 A JP 2000140315A JP 2001321895 A JP2001321895 A JP 2001321895A
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- drum
- thin
- continuous casting
- slab continuous
- cast slab
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、普通鋼、ステンレ
ス鋼、合金鋼、珪素鋼、および、その他の金属の溶湯か
ら直接に薄鋳片を鋳造する双ドラム式連続鋳造機の冷却
ドラム、および、これを用いて薄鋳片を連続鋳造する方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling drum for a twin-drum continuous caster for casting thin slabs directly from a molten metal of ordinary steel, stainless steel, alloy steel, silicon steel, and other metals, and And a method for continuously casting thin slabs using the same.
【０００２】[0002]
【従来の技術】連続鋳造によってホットストリップと同
等かそれに近い厚さの鋳片を製造する装置として、例え
ば、双ドラム式連続鋳造装置が知られている。この装置
は、図３に示すように、軸を水平にし互いに接近して並
行に設置され、且つ互いに逆方向に回転する一対の冷却
ドラム１、１’と、冷却ドラム１、１’の両端面に圧着
されたサイド堰２とを主要な構成部材としている。2. Description of the Related Art For example, a twin-drum continuous casting apparatus is known as an apparatus for producing a cast piece having a thickness equal to or close to that of a hot strip by continuous casting. As shown in FIG. 3, the apparatus has a pair of cooling drums 1 and 1 ′ that are installed in parallel with each other with their axes horizontal and that rotate in opposite directions, and both end faces of the cooling drums 1 and 1 ′. And the side weir 2 crimped on the main component.
【０００３】冷却ドラム１、１’とサイド堰２とで形成
された湯溜まり部３の上方にはシールチャンバー４が設
けられ、シールチャンバー４内には不活性ガスが供給さ
れる。湯溜まり部３にタンディッシュ５から溶湯を連続
的に供給することにより、溶湯は冷却ドラム１との接触
部で凝固シェルを形成し、凝固シェルは冷却ドラム１、
１’の回転に伴ってキッシングポイント６で圧着され薄
鋳片Ｃとなる。[0003] A seal chamber 4 is provided above a pool 3 formed by the cooling drums 1, 1 ′ and the side weirs 2, and an inert gas is supplied into the seal chamber 4. By continuously supplying the molten metal from the tundish 5 to the pool 3, the molten metal forms a solidified shell at a contact portion with the cooling drum 1.
With the rotation of 1 ′, it is pressed at the kissing point 6 to form a thin slab C.
【０００４】この冷却ドラム１、１’は、回転しながら
溶湯を冷却して凝固シェルを生成するためのものであ
り、一般に、熱伝導率の良好なＣｕ、Ｃｕ合金によって
形成される。この冷却ドラム１、１’は、湯溜まり部３
を形成する時は溶湯と直接接触するが、キッシングポイ
ント６を過ぎ、次に湯溜まり部３を形成するまでは溶湯
と非接触状況となることから、溶湯の保有熱で加熱され
たり、冷却ドラム１、１’の内部冷却水や空気により冷
却される。また、凝固シェルを圧着して薄鋳片Ｃにする
際に、薄鋳片Ｃと冷却ドラム１、１’表面の相対滑りに
よる摩擦力を繰り返し受けるため、表層がＣｕまたはＣ
ｕ合金の場合には、鋳造の進行に伴い、周面表層ｄの損
耗が激しく、表面形状が維持できなくなるため早期に鋳
造不能となる。[0004] The cooling drums 1, 1 'are for cooling the molten metal while rotating to form a solidified shell, and are generally formed of Cu or a Cu alloy having good thermal conductivity. The cooling drums 1 and 1 ′ are
Is directly in contact with the molten metal, but is in a non-contact state with the molten metal after passing through the kissing point 6 and forming the pool 3 next time. It is cooled by 1, 1 'internal cooling water or air. Further, when the solidified shell is pressed and formed into a thin cast piece C, the thin cast piece C and the cooling drums 1 and 1 'are repeatedly subjected to a frictional force due to relative slippage, so that the surface layer is made of Cu or C.
In the case of a u-alloy, as the casting proceeds, the surface layer d of the peripheral surface is heavily worn, and the surface shape cannot be maintained.
【０００５】このようなドラム表層の早期損耗を防止す
るため、冷却ドラム１、１’の表面に、例えば、１ｍｍ
厚さ程度のＮｉめっき層を形成した冷却ドラム構造が知
られている。薄鋳片Ｃは板厚が１〜７mm程度と薄いた
め、その表面は凝固シェルの形成状態の影響を著しく受
け、急冷による凝固シェル厚の不均一等により表面割れ
や光沢むらが発生するという問題がある。表面割れの発
生を防止するために、冷却ドラム周面のＮｉめっき部分
にショットブラスト、フォトエッチ、レーザ加工等によ
り多数の窪みを設ける技術が、例えば、特開昭６０−１
８４４４９号公報に開示されている。この窪みによって
冷却ドラムと凝固シェルとの間に断熱層となるガスギャ
ップを形成することで溶湯の緩慢な冷却を行い、また、
窪みに溶湯を適度に入り込ませて鋳片表面に凸転写を形
成させ、凸転写の周縁から凝固を開始させることで凝固
シェル厚の均一化を図るものである。In order to prevent such early wear of the drum surface layer, for example, 1 mm
2. Description of the Related Art A cooling drum structure having a Ni plating layer of about the thickness is known. Since the thin slab C is as thin as about 1 to 7 mm, its surface is significantly affected by the state of formation of the solidified shell, and the surface of the solidified shell is uneven due to quenching. There is. In order to prevent the occurrence of surface cracks, a technique of providing a large number of depressions by shot blasting, photoetching, laser processing, or the like in the Ni plating portion of the cooling drum peripheral surface is disclosed in, for example, JP-A-60-1.
No. 84449. By forming a gas gap that becomes a heat insulating layer between the cooling drum and the solidified shell by this dent, slow cooling of the molten metal is performed,
The thickness of the solidified shell is made uniform by allowing the molten metal to enter the depressions appropriately to form a convex transfer on the surface of the cast slab and starting solidification from the periphery of the convex transfer.
【０００６】しかしながら、湯だまり部に注入された溶
融金属（溶湯）の表面に浮遊する酸化物（スカム）が、
冷却ドラムの回転とともに、流れ込む溶湯に付随して引
き込まれ、鋳片の凝固シェルの表面に付着して鋳造され
る場合があり、この結果、薄肉鋳片のスカム流入部と健
全部との間に凝固不均一が生じて割れが発生し、鋳片の
品質が損なわれるという問題点があった。However, the oxide (scum) floating on the surface of the molten metal (molten metal) injected into the basin is
With the rotation of the cooling drum, it may be drawn along with the flowing molten metal, adhered to the surface of the solidified shell of the slab, and cast, and as a result, between the scum inflow part and the healthy part of the thin slab There is a problem that uneven solidification occurs, cracks occur, and the quality of the slab is impaired.
【０００７】このような問題点に対応するため、特許第
２９７７２８９号公報、特開平６−３２８２０４号公報
に、２種類の大きさの窪みを組み合わせて導入すること
により、小さい径の窪みによって製品表面割れを防止
し、大きい径の窪みによって光沢むらを防止する冷却ド
ラム構造が提示されている。しかしながら、本発明者に
よる実験研究の結果、開示されている窪みの組合せ条件
では上記の二種の機能を同時に満足させることが困難で
あることが判明した。さらに、冷却ドラム表面の材質に
関する特定はなされていない。In order to cope with such a problem, two types of depressions are combined and introduced into Japanese Patent No. 2977289 and Japanese Patent Laid-Open Publication No. Hei 6-328204, so that the surface of the product is reduced by the depression having a small diameter. A cooling drum structure has been proposed which prevents cracking and prevents uneven gloss due to large diameter depressions. However, as a result of experimental research by the present inventors, it has been found that it is difficult to simultaneously satisfy the above two functions under the disclosed combination conditions of depressions. Further, there is no specification regarding the material of the cooling drum surface.
【０００８】さらに、ここでの冷却ドラムの周面表層ｄ
の材質は、前述のごとく、一般的に、Ｎｉめっき層が想
定されている。Ｎｉめっき部はドラム母材（Ｃｕ、Ｃｕ
合金）より熱伝導率が低く、母材との結合性も良好であ
ることから亀裂や剥離が生じ難く、かつ、母材より高硬
度で耐磨耗性、耐変形性において相対的に優れたもので
あるが、実鋳造において長期間に亘って表面形状を安定
維持するレベルの耐磨耗性や耐変形性には到達していな
い。そのため、長期間の連続使用を行うと、冷却ドラム
の周面表層ｄの形状変化に伴い、薄鋳片Ｃの表面割れの
発生主因になり得ることが確認されている。Further, the peripheral surface layer d of the cooling drum here
Is generally assumed to be a Ni plating layer as described above. The Ni plating part is a drum base material (Cu, Cu
Alloy) has a lower thermal conductivity and good bondability with the base material, so it is less likely to crack or peel off, and has a higher hardness than the base material, and is relatively superior in abrasion resistance and deformation resistance. However, in actual casting, it has not yet reached the level of abrasion resistance and deformation resistance that stably maintain the surface shape over a long period of time. For this reason, it has been confirmed that, when used continuously for a long period of time, the shape change of the surface layer d of the peripheral surface of the cooling drum may be a main cause of the surface cracks of the thin slab C.
【０００９】[0009]
【発明が解決しようとする課題】本発明の課題とすると
ころは、上述の従来技術における問題点である薄板製品
の二大欠陥である表面割れと光沢むらの発生を同時に抑
制した薄鋳片を長期間に亘って安定して鋳造し得る技術
を実現することにあり、そのための薄鋳片連続鋳造機用
ドラムおよび薄鋳片連続鋳造方法を提供するものであ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a thin slab which simultaneously suppresses the occurrence of surface cracks and uneven gloss, which are two major defects of a thin plate product, which are problems in the above-mentioned prior art. An object of the present invention is to provide a technique for continuously casting a thin slab and a method for continuously casting a thin slab for the purpose of realizing a technique capable of performing casting for a long period of time.
【００１０】[0010]
【課題を解決するための手段】前記課題は、以下の
（１）〜（５）の発明により解決する。 （１）互いに反対方向に回転する一対の冷却ドラムの間
隙の上部に形成された湯溜まり部に、溶湯を連続的に供
給して薄鋳片に連続鋳造するための薄鋳片連続鋳造機用
ドラムにおいて、ドラム母材の熱伝導率が１００Ｗ／ｍ
・Ｋ以上であり、熱膨張率が該ドラム母材の０．５０〜
１．２０倍でビッカース硬さＨｖが１５０以上であり厚
みが１００〜２０００μm の中間層が前記ドラム母材の
表面に被覆され、さらに、最表面に厚み１〜５００μm
でビッカース硬さＨｖが２００以上の硬質めっきが施さ
れたドラムであって、その表面に直径が２００〜２００
０μｍ、深さが８０〜２００μｍの窪みを互いに接する
か重なりを持つ条件で形成し、さらに、直径が５０〜２
００μm 、深さが３０μm 以上の微***を穴相互間が接
しない条件下でピッチが１００〜５００μm となるよう
形成したことを特徴とする薄鋳片連続鋳造機用ドラム。 （２）前（１）項記載の薄鋳片連続鋳造機用ドラムにお
いて、ドラム母材が銅もしくは銅合金であり、中間層が
Ｎｉ、Ｎｉ−Ｃｏ、Ｎｉ−Ｃｏ−ＷまたはＮｉ−Ｆｅの
めっき層であり、表層の硬質めっきがＮｉ−Ｃｏ−Ｗ、
Ｎｉ−Ｗ、Ｎｉ−Ｃｏ、Ｃｏ、Ｎｉ−Ｆｅ、Ｎｉ−Ａ
ｌ、Ｃｒのいずれかであることを特徴とする薄鋳片連続
鋳造機用ドラム。 （３）前（１）項記載の薄鋳片連続鋳造機用ドラムにお
いて、窪みをショットブラストによって形成し、微***
をパルスレーザ加工によって形成することを特徴とする
薄鋳片連続鋳造機用ドラム。 （４）前（１）項記載の薄鋳片連続鋳造機用ドラムを用
いることを特徴とする薄鋳片連続鋳造方法。 （５）前（４）項記載の薄鋳片連続鋳造方法において、
薄鋳片連続鋳造中の溶湯との非接触タイミングに、前記
微***を加工処理することを特徴とする薄鋳片連続鋳造
方法。The above object is achieved by the following inventions (1) to (5). (1) For a thin slab continuous casting machine for continuously supplying molten metal to a basin formed above a gap between a pair of cooling drums rotating in opposite directions to continuously cast thin slabs. In the drum, the thermal conductivity of the drum base material is 100 W / m
-K or more, the coefficient of thermal expansion is 0.50 to 0.50
An intermediate layer having a Vickers hardness Hv of not less than 150 and a thickness of 100 to 2000 μm having a thickness of 100 to 2000 μm is coated on the surface of the drum base material.
A hard-plated drum having a Vickers hardness Hv of 200 or more and a diameter of 200 to 200
Depressions having a diameter of 0 μm and a depth of 80 to 200 μm are formed under the condition that they are in contact with each other or have an overlap.
1. A drum for a thin cast continuous casting machine, wherein micro holes having a diameter of 00 [mu] m and a depth of 30 [mu] m or more are formed to have a pitch of 100 to 500 [mu] m under the condition that the holes do not contact each other. (2) In the thin cast slab continuous casting machine drum according to the above (1), the drum base material is copper or a copper alloy, and the intermediate layer is made of Ni, Ni-Co, Ni-Co-W or Ni-Fe. The plating layer, the hard plating of the surface layer is Ni-Co-W,
Ni-W, Ni-Co, Co, Ni-Fe, Ni-A
1. A thin cast slab continuous casting machine drum, which is any one of l and Cr. (3) The thin cast slab continuous casting machine drum according to the above (1), wherein the depression is formed by shot blasting and the minute hole is formed by pulse laser processing. . (4) A method for continuously casting a thin slab, comprising using the drum for a continuous thin slab caster according to the above (1). (5) In the continuous thin slab casting method according to the above (4),
A method for continuously casting a thin slab, wherein the minute hole is processed at a timing of non-contact with a molten metal during the continuous casting of a thin slab.
【００１１】[0011]
【発明の実施の形態】図１は、本発明（請求項１の発
明）に沿う冷却ドラム断面の周面表層ｄを拡大して示し
た断面図（ａ）、ならびに、表面の凹凸状況を色の濃さ
で表した表面図（ｂ）である。以下では、図１を用いて
本発明の冷却ドラムの各構成要件とその規定理由につい
て詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view (a) showing an enlarged peripheral surface layer d of a cross section of a cooling drum according to the present invention (the first aspect of the present invention), and the state of unevenness on the surface is shown by color. (B) of FIG. Hereinafter, each component of the cooling drum of the present invention and the reason for its definition will be described in detail with reference to FIG.
【００１２】ドラム母材７は、その温度を低く保ち発生
熱応力を小さくして長寿命化を図るため、１００Ｗ／ｍ
・Ｋ以上の熱伝導率が要求される。ＣｕおよびＣｕ合金
の熱伝導率は３２０〜４００Ｗ／ｍ・Ｋであることから
これらが最適な材質である。ドラム表面の中間層８は、
熱膨張係数を母材の１．２倍未満とすることにより、中
間層８とドラム母材７間の熱膨張係数差により発生する
熱応力に起因する剪断応力を小さくして、中間層８の剥
離を防止できる。１．２倍以上の熱膨張係数差がある
と、熱応力により短期間で中間層８が剥離し使用不能と
なる。この観点で、中間層８とドラム母材７の熱膨張係
数は同じであることが望ましいが、中間層８に要求され
る硬度を満足する材料としては、０．５倍以上のものが
ほとんどであることから、下限は実質的に０．５倍程度
である。The drum base material 7 is kept at 100 W / m in order to keep the temperature low and to reduce the generated thermal stress to extend the life.
・ K or higher thermal conductivity is required. Since the thermal conductivity of Cu and Cu alloy is 320 to 400 W / m · K, these are the optimal materials. The intermediate layer 8 on the drum surface
By setting the thermal expansion coefficient to less than 1.2 times that of the base material, the shear stress caused by the thermal stress generated by the difference in the thermal expansion coefficient between the intermediate layer 8 and the drum base material 7 is reduced, and Peeling can be prevented. If there is a difference of 1.2 times or more in the thermal expansion coefficient, the intermediate layer 8 is peeled off in a short period of time due to thermal stress, and becomes unusable. From this viewpoint, it is desirable that the thermal expansion coefficient of the intermediate layer 8 and that of the drum base material 7 be the same, but most of the materials satisfying the hardness required for the intermediate layer 8 are 0.5 times or more. For this reason, the lower limit is substantially about 0.5 times.
【００１３】中間層８のビッカース硬さＨｖは、１５０
未満では中間層８としての耐変形性に劣り寿命が短くな
る。また、Ｈｖが１０００を超えると靱性が低くなり割
れやすくなるので、中間層８のＨｖは１０００未満であ
ることが望ましい。中間層８の厚みは、ドラム母材７を
熱的に保護するために１００μm 以上が必要であり、ま
た、中間層８表面の温度が上がりすぎないための条件と
して、最大厚みは２０００μm であることが要求され
る。中間層８の形成材料としては、熱伝導率が８０Ｗ／
ｍ・Ｋ程度であり、ドラム母材７の温度を低く保つこと
ができるＮｉ、Ｎｉ−Ｃｏ、Ｎｉ−Ｃｏ−Ｗ、Ｎｉ−Ｆ
ｅなどが適性があり、ドラム母材７にめっきで被覆する
ことが、結合力を安定させ強度を大きくでき寿命を長く
できる。また、均一な被覆を形成する上でも好ましい。The Vickers hardness Hv of the mid layer 8 is 150
If it is less than 10, the deformation resistance of the intermediate layer 8 is inferior and the life is shortened. Further, if Hv exceeds 1000, the toughness is lowered and cracks easily occur. Therefore, the Hv of the intermediate layer 8 is desirably less than 1000. The thickness of the intermediate layer 8 must be 100 μm or more in order to thermally protect the drum base material 7, and the maximum thickness is 2000 μm as a condition for preventing the temperature of the surface of the intermediate layer 8 from rising too much. Is required. The material for forming the intermediate layer 8 has a thermal conductivity of 80 W /
Ni, Ni—Co, Ni—Co—W, and Ni—F which are about m · K and can keep the temperature of the drum base material 7 low.
e is suitable, and coating the drum base material 7 with plating can stabilize the bonding force, increase the strength, and extend the life. It is also preferable for forming a uniform coating.
【００１４】ドラム表面の最表層９の材質特性で要求さ
れる最も重要なパラメータは耐摩耗性であり、実用的に
最低限要求されるビッカース硬さＨｖは２００以上であ
る。厚みは１μm 以上あれば充分な耐摩耗性が得られ
る。厚みの上限値に関しては、硬質めっき材料は、一般
的に熱伝導率が低いので、表面温度が上昇しすぎないよ
うに５００μm 以下である必要がある。The most important parameter required for the material properties of the outermost layer 9 on the drum surface is abrasion resistance, and the minimum Vickers hardness Hv practically required is 200 or more. If the thickness is 1 μm or more, sufficient wear resistance can be obtained. Regarding the upper limit of the thickness, the hard plating material generally has a low thermal conductivity, so that it is required to be 500 μm or less so that the surface temperature does not rise too much.
【００１５】硬質めっきの形成材料としては、２００以
上のＨｖが得られる材料として、Ｎｉ−Ｃｏ−Ｗ、Ｎｉ
−Ｗ、Ｎｉ−Ｃｏ、Ｃｏ、Ｎｉ−Ｆｅ、Ｎｉ−Ａｌ、Ｃ
ｒのいずれかが適性があり、中間層８にめっきで被覆す
ることが、結合力を安定させ強度を大きくでき、長寿命
化を図ることができる。次に、冷却ドラムの周面表層ｄ
における窪み１０、及び、微***１１の加工の要件につ
いて説明する。As the material for forming the hard plating, Ni-Co-W, Ni
-W, Ni-Co, Co, Ni-Fe, Ni-Al, C
r is suitable, and coating the intermediate layer 8 with plating can stabilize the bonding force, increase the strength, and extend the life. Next, the peripheral surface layer d of the cooling drum
The requirements for the processing of the depression 10 and the minute hole 11 will be described.
【００１６】冷却ドラムの周面表層ｄには、まず、１ｍ
ｍオーダーの長周期の凹凸（窪み１０）がショットブラ
スト法などによって全面に亘って導入される。このよう
な窪み１０をつけた冷却ドラムを用いて溶湯を鋳造する
と、まず、窪み凸部に溶湯が接触して凝固核の生成が起
こり、一方、窪み凹部では、鋳片表面との間にガスギャ
ップが生成して凝固核の生成は遅れる。窪み凸部での凝
固核の発生によって凝固収縮応力は分散、緩和され、割
れの発生は抑制される。First, 1 m is placed on the outer surface layer d of the cooling drum.
Long-period irregularities (indents 10) of m-order are introduced over the entire surface by a shot blast method or the like. When a molten metal is cast by using a cooling drum having such a depression 10, first, the molten metal comes into contact with the depression convex portion to generate solidification nuclei. The formation of a gap delays the formation of solidification nuclei. The solidification shrinkage stress is dispersed and relaxed by the generation of solidification nuclei at the concave projections, and the generation of cracks is suppressed.
【００１７】このような目的を達成するためには、窪み
凸部が明確に規定される必要があり、このため、窪み１
０は互いに接するか、重なりを持つ条件で形成する必要
がある。これは、窪み１０が接しない条件で形成される
と、元々の表面の平坦な部分が上記窪み凸部と同様な働
きを行い、凝固核の発生を明確に規定できなくなるため
である。窪み直径は、窪み凹部での凝固遅れに伴って発
生する凝固収縮応力に起因する割れ発生との関係で規定
され、２０００μm 以下である必要がある。また、この
下限値は、後述する微***１１の直径との関係で規定さ
れ、微***の径以上である要件から２００μm となる。In order to achieve such an object, it is necessary to clearly define the depression convex portion.
0s need to be formed under the condition that they touch or overlap each other. This is because, if the dent 10 is formed under the condition that the dent 10 does not contact, the flat portion of the original surface performs the same function as the above-mentioned dent projection, and the generation of the solidification nucleus cannot be clearly defined. The depression diameter is defined in relation to the occurrence of cracks caused by solidification shrinkage stress that occurs with the solidification delay in the depression concave portion, and needs to be 2000 μm or less. The lower limit is defined by the relationship with the diameter of the minute holes 11 described later, and is 200 μm from the requirement that the diameter be equal to or larger than the diameter of the minute holes.
【００１８】窪み深さは、上記ガスギャップを生成させ
るため８０μm 以上の値が要求される。また、窪み深さ
が大きすぎると窪み凹部のガスギャップの厚みが増大
し、窪み凹部の凝固シェルの生成が大きく遅れ、窪み凸
部の凝固シェルとの間の厚みの不均一が拡大して割れが
発生するので、２００μm 以下である必要がある。以上
の説明に示した窪み１０の形成によって、定常的な鋳造
条件下においては、薄鋳片Ｃの割れ・光沢むらは有効に
抑制される。The depth of the depression is required to be 80 μm or more in order to generate the gas gap. On the other hand, if the depth of the depression is too large, the thickness of the gas gap in the depression is increased, and the generation of the solidified shell in the depression is greatly delayed. Is required, it needs to be 200 μm or less. The formation of the depressions 10 described above effectively suppresses cracks and uneven glossiness of the thin slab C under steady casting conditions.
【００１９】しかしながら、この窪み１０のみを形成し
た冷却ドラム１、１’による鋳造では、〔従来の技術〕
の項に記述したごとく、酸化物（スカム）が冷却ドラム
の回転とともに、流れ込む溶湯に付随して引き込まれ、
鋳片の凝固シェルの表面に付着して鋳造される場合に
は、薄肉鋳片のスカム流入部と健全部との間に凝固不均
一が生じて割れやむらが発生する可能性がある。However, in the casting using the cooling drums 1 and 1 'in which only the depression 10 is formed, [prior art]
As described in the section, oxides (scum) are drawn along with the flowing molten metal as the cooling drum rotates,
If the cast slab is adhered to the surface of the solidified shell and cast, the solidified non-uniformity may occur between the scum inflow portion and the healthy portion of the thin cast slab, which may cause cracks or unevenness.
【００２０】そこで、本発明者らは詳細にわたる実験研
究を遂行した結果、この窪み１０に、さらに、微***１
１を特定条件で導入することにより、スカムが流入した
箇所においても凝固不均一が発生しないことを解明し
た。本発明者らは、スカムが溶湯と冷却ドラム１、１’
との間に流入した場合に発生する凝固不均一は、スカム
の熱伝導率の違いよりも、流入時に巻き込まれて生成す
る空気層の存在に起因することを見い出した。この際に
溶湯やスカムが表面張力によって流れ込まない程度の微
***１１が表面に存在すると、上記空気は、この微***
１１の部分に集約され空気層の形成が発生しない。Therefore, the present inventors have conducted detailed experimental research, and as a result, in this recess 10,
By introducing 1 under specific conditions, it was elucidated that solidification non-uniformity did not occur even at a location where scum flowed. The present inventors have found that the scum is composed of the molten metal and the cooling drums 1, 1 '.
It has been found that the non-uniform coagulation that occurs when the air flows between the scum and the air is caused by the presence of an air layer formed by being caught during the inflow, rather than the difference in the thermal conductivity of the scum. At this time, if there is a minute hole 11 on the surface that does not allow molten metal or scum to flow due to surface tension, the air is concentrated at the minute hole 11 and no air layer is formed.
【００２１】したがって、たとえスカムが流入しても凝
固不均一の発生が抑制される。さらに、微***１１が存
在することによって上記窪み１０の要件で説明した凝固
核の発生をより細かい間隔で規定することが可能になる
ため、ガスギャップ部における凝固遅れに伴う割れ発生
をより確実に抑制することができる。このような機能を
達成するための微***１１の要件としては、まず溶湯や
スカムが流れ込まないための穴直径の上限値として２０
０μm 以下であることが要求される。さらに、空気が巻
き込まれた際に、有効に微***１１に集約するための要
件として穴直径の最小値が規定され、これは５０μm で
ある。Therefore, even if the scum flows, the occurrence of uneven solidification is suppressed. Further, the presence of the minute holes 11 makes it possible to regulate the generation of solidification nuclei described in the requirement of the depression 10 at finer intervals, so that the generation of cracks due to solidification delay in the gas gap portion is more reliably achieved. Can be suppressed. In order to achieve such a function, the requirements of the micro holes 11 are as follows.
It is required to be less than 0 μm. Further, when air is entrained, a minimum value of the hole diameter is specified as a requirement for effectively concentrating the micro holes 11, which is 50 μm.
【００２２】さらに、微***１１の相互間隔は、空気を
有効に集約するため穴相互が接しない条件であることが
必要で、凝固核発生を確実に規定するため穴相互の中心
間ピッチは、１００〜５００μm であることが要求され
る。また、空気の集約機能を有効に発揮させかつ、凝固
核発生を明確に規定するためには深さとして３０μm以
上が必要である。Further, the interval between the micro holes 11 must be such that the holes are not in contact with each other in order to effectively consolidate the air. It is required to be 100 to 500 μm. Further, a depth of 30 μm or more is required to effectively exert the function of condensing air and to clearly define the generation of solidification nuclei.
【００２３】以上のような窪み１０ならびに微***１１
は、冷却ドラム１、１’上に中間層８、最表面層９へめ
っき処理を施した後に形成する。なお、最表層めっき硬
度が非常に高く、窪み形成時にめっき部に割れが発生す
る可能性がある場合には、中間層８をめっきした後に窪
み１０を形成させ、その上で最表層９をめっきし、最後
に、微***１１を導入する可能性もあり、この順序はめ
っき種の選定にしたがって適宜選択される。The depression 10 and the minute hole 11 as described above
Is formed after plating treatment is applied to the intermediate layer 8 and the outermost surface layer 9 on the cooling drums 1 and 1 ′. In the case where the outermost layer plating hardness is very high and there is a possibility that a crack may occur in the plated portion when forming the dent, the dent 10 is formed after plating the intermediate layer 8, and then the outermost layer 9 is plated. Finally, there is a possibility that the minute holes 11 are introduced, and this order is appropriately selected according to the selection of the plating type.
【００２４】これらの窪み１０ならびに微***１１を形
成する手段としては、窪み１０に関しては相互が重なり
合うパターンを導入する方法として、空間的にランダム
なパターン形成が可能であるショットブラスト法が有効
であるが、放電加工その他の手法によって、本発明（請
求項１の発明）で規定する条件を満たす加工ができる手
段であればいずれでもよい。また、微***１１の形成手
段としては、空間的なパターン制御が容易なパルスレー
ザ加工法が最も適しているが、フォトエッチング法など
のその他の手法で実現することも可能である。As a means for forming the depressions 10 and the micro holes 11, a shot blast method capable of forming a spatially random pattern is effective as a method for introducing a pattern in which the depressions 10 overlap each other. However, any means can be used as long as it can perform machining satisfying the conditions defined in the present invention (the invention of claim 1) by electric discharge machining or other methods. As a means for forming the minute holes 11, a pulse laser processing method, in which spatial pattern control is easy, is most suitable, but it can be realized by other methods such as a photo etching method.
【００２５】以上の説明においては、冷却ドラム１、
１’は、薄鋳片鋳造に供する前に、本発明（請求項１の
発明）で規定する条件で製造し使用することを想定して
記述したが、微***１１が鋳造の進行と共に磨滅する可
能性がある最表層めっき種が選定された場合には、図２
に示すように、鋳造中に冷却ドラム面が溶湯から離れた
タイミングで、微***１１を常時パルスレーザ加工によ
って導入する手段をとることも可能である。図２に示す
構成においては、レーザ発振器１２から出力されたパル
スレーザ光１４を集光レンズ１３で集光照射することに
より、周方向に微***１１を形成させる。なお、図示し
ない光走査装置により紙面垂直方向にレーザ光を走査す
ることにより、ドラム１、１’の全面に亘って微***１
１を形成することができる。In the above description, the cooling drum 1,
1 'is described assuming that the thin slab is manufactured and used under the conditions specified in the present invention (the invention of claim 1) before being subjected to thin slab casting, but the micro holes 11 are worn out as the casting proceeds. Fig. 2
As shown in (1), it is also possible to take a means for constantly introducing the micro holes 11 by pulse laser processing at the timing when the cooling drum surface is separated from the molten metal during casting. In the configuration shown in FIG. 2, the pulse laser beam 14 output from the laser oscillator 12 is condensed and radiated by the condenser lens 13 to form the minute hole 11 in the circumferential direction. By scanning a laser beam in a direction perpendicular to the paper surface with an optical scanning device (not shown), the minute holes 1 are formed over the entire surface of the drums 1 and 1 '.
1 can be formed.
【００２６】[0026]
【実施例】オーステナイト系ステンレス鋼（ＳＵＳ３０
４）を図３に示す双ドラム式連続鋳造装置により、板厚
３mmの帯状の薄鋳片に鋳造し、鋳造に引続いて熱間圧延
し、その後に冷間圧延して、板厚０．５mmの薄板製品を
製造した。上記薄鋳片を鋳造するに際し、幅８００mm、
直径１２００mmの冷却ドラムの周面に、表１に示す条件
で中間層８ならびに最表層９をめっきし、窪み１０なら
びに微***１１を形成したドラム１、１’を用いた。冷
却ドラムの周面表層ｄに対する加工方法としては、窪み
１０の形成にショットブラスト法を、また、微***１１
の形成にレーザー法を用いた。冷却ドラム１、１’の耐
久性の評価に関しては、それぞれで２０回の鋳造を行
い、その周面表層ｄの損耗状態を目視評価することによ
って行った。また、鋳片品質の評価に関しては、冷間圧
延後の薄板製品を目視検査することによって行った。[Example] Austenitic stainless steel (SUS30)
3) is cast into a strip-shaped thin slab having a thickness of 3 mm by a twin-drum continuous casting apparatus shown in FIG. 3, hot-rolled after casting, and then cold-rolled to obtain a sheet thickness of 0.1 mm. A 5 mm sheet product was produced. When casting the thin slab, the width 800mm,
Drums 1 and 1 ′ were prepared by plating the intermediate layer 8 and the outermost layer 9 on the peripheral surface of a cooling drum having a diameter of 1200 mm under the conditions shown in Table 1 to form dents 10 and minute holes 11. As a processing method for the peripheral surface layer d of the cooling drum, a shot blast method is used for forming the depression 10 and a fine hole 11 is formed.
The laser method was used for the formation. The durability of the cooling drums 1 and 1 ′ was evaluated by performing casting 20 times for each, and visually evaluating the state of wear of the peripheral surface layer d. The evaluation of cast slab quality was carried out by visually inspecting the sheet product after cold rolling.
【００２７】Ｎｏ．１〜８は発明例を示す。Ｎｏ．９及
び１０は、従来法による比較例としてＮｉめっき表面ド
ラムにおいて、微***１１の有無のケースを示す。発明
例では、いずれのケースにおいても、冷却ドラムの耐久
性に優れ、かつ、薄鋳片に表面割れの発生はなく、圧延
後の薄板製品にも表面疵は発生しなかった。比較例で
は、２０回の連続鋳造において、冷却ドラム表面の損耗
が発生し、その結果として、初期の鋳片品質の良いＮ
ｏ．９の条件においても、最終的には薄鋳片表面に割れ
が発生し、圧延後の薄板製品に表面疵ならびに光沢むら
が発生した。No. 1 to 8 show invention examples. No. Reference numerals 9 and 10 show, as comparative examples according to the conventional method, cases in which the presence or absence of minute holes 11 is present in the Ni-plated surface drum. In each of the cases of the invention, in any case, the durability of the cooling drum was excellent, there was no occurrence of surface cracks in the thin slab, and no surface defects occurred in the rolled sheet product. In the comparative example, the wear of the cooling drum surface occurred in the continuous casting of 20 times, and as a result, N with good initial slab quality was obtained.
o. Even under the condition of No. 9, cracks finally occurred on the surface of the thin slab, and surface defects and uneven gloss were generated on the rolled sheet product.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【発明の効果】本発明によれば、双ドラム式連続鋳造装
置等によって製造される薄鋳片の表面割れならびに光沢
むらを確実に防止するとともに、ドラム表面の高い耐久
性が実現できるので、安定した無欠陥鋳片の製造を実現
できる効果を有する。According to the present invention, it is possible to reliably prevent surface cracks and uneven gloss of thin slabs produced by a twin-drum continuous casting apparatus or the like, and to realize high durability of the drum surface. This has the effect of realizing the production of a defect-free cast slab.
【図１】本発明による双ドラム式連続鋳造用冷却ドラム
の表面の態様を示す図である。（ａ）は、表面近傍を拡
大して示す断面図、ならびに（ｂ）は、表面の凹凸状況
を色の濃さで表す表面図である。FIG. 1 is a view showing an aspect of a surface of a cooling drum for twin-drum continuous casting according to the present invention. (A) is a cross-sectional view showing the vicinity of the surface in an enlarged manner, and (b) is a surface diagram showing the unevenness of the surface by color density.
【図２】本発明の実施例を示す双ドラム式連続鋳造方法
の側面図である。FIG. 2 is a side view of a twin-drum continuous casting method showing an embodiment of the present invention.
【図３】従来の双ドラム式連続鋳造装置の側面図であ
る。FIG. 3 is a side view of a conventional twin-drum continuous casting apparatus.
１，１’…冷却ドラム ２…サイド堰 ３…湯溜まり部 ４…シールチャンバー ５…タンディッシュ ６…キッシングポイント ７…ドラム母材 ８…ドラム表面の中間層 ９…ドラム表面の最表層 １０…ドラム表面の窪み １１…ドラム表面の微*** １２…レーザ発振器 １３…集光レンズ １４…パルスレーザ光 Ｃ…薄鋳片 ｄ…冷却ドラムの周面表層 1, 1 '... cooling drum 2 ... side dam 3 ... hot water pool part 4 ... seal chamber 5 ... tundish 6 ... kissing point 7 ... drum base material 8 ... intermediate layer on drum surface 9 ... outermost layer on drum surface 10 ... drum Surface dents 11 ... Micro holes on drum surface 12 ... Laser oscillator 13 ... Condenser lens 14 ... Pulse laser light C ... Thin cast d ... Surface surface layer of cooling drum
フロントページの続き (72)発明者 栗栖 泰 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 (72)発明者 山村 英明 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 Ｆターム(参考） 4E004 DA13 QA01 QA03 Continued on the front page (72) Inventor Yasushi Kurisu 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Hideaki Yamamura 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division F-term (reference) 4E004 DA13 QA01 QA03
Claims (5)
ラムの間隙の上部に形成された湯溜まり部に、溶湯を連
続的に供給して薄鋳片に連続鋳造するための薄鋳片連続
鋳造機用ドラムにおいて、ドラム母材の熱伝導率が１０
０Ｗ／ｍ・Ｋ以上であり、熱膨張率が該ドラム母材の
０．５０〜１．２０倍でビッカース硬さＨｖが１５０以
上であり厚みが１００〜２０００μm の中間層が前記ド
ラム母材の表面に被覆され、さらに、最表面に厚み１〜
５００μm でビッカース硬さＨｖが２００以上の硬質め
っきが施されたドラムであって、その表面に直径が２０
０〜２０００μｍ、深さが８０〜２００μｍの窪みを互
いに接するか重なりを持つ条件で形成し、さらに、直径
が５０〜２００μm 、深さが３０μm 以上の微***を穴
相互間が接しない条件下でピッチが１００〜５００μm
となるよう形成したことを特徴とする薄鋳片連続鋳造機
用ドラム。1. A thin slab continuous casting for continuously supplying a molten metal to a basin formed at an upper portion of a gap between a pair of cooling drums rotating in opposite directions to continuously cast a thin slab. Machine drum has a thermal conductivity of 10
0 W / m · K or more, the coefficient of thermal expansion is 0.50 to 1.20 times that of the drum base material, the Vickers hardness Hv is 150 or more, and the thickness of the intermediate layer is 100 to 2000 μm. It is coated on the surface, and the outermost surface has a thickness of 1 to
A drum coated with hard plating having a Vickers hardness Hv of 200 or more and a diameter of 20 μm.
A recess having a diameter of 0 to 2000 μm and a depth of 80 to 200 μm is formed so as to be in contact with or overlapping with each other, and a micro hole having a diameter of 50 to 200 μm and a depth of 30 μm or more is formed under the condition that the holes do not contact each other. Pitch is 100-500μm
A thin cast slab continuous casting machine drum characterized by being formed as follows.
ムにおいて、ドラム母材が銅もしくは銅合金であり、中
間層がＮｉ、Ｎｉ−Ｃｏ、Ｎｉ−Ｃｏ−ＷまたはＮｉ−
Ｆｅのめっき層であり、表層の硬質めっきがＮｉ−Ｃｏ
−Ｗ、Ｎｉ−Ｗ、Ｎｉ−Ｃｏ、Ｃｏ、Ｎｉ−Ｆｅ、Ｎｉ
−Ａｌ、Ｃｒのいずれかであることを特徴とする薄鋳片
連続鋳造機用ドラム。2. The thin cast slab continuous casting machine drum according to claim 1, wherein the drum base material is copper or a copper alloy, and the intermediate layer is Ni, Ni—Co, Ni—Co—W, or Ni—.
Fe plating layer, the surface hard plating is Ni-Co
-W, Ni-W, Ni-Co, Co, Ni-Fe, Ni
-A drum for a thin cast slab continuous casting machine, which is any one of Al and Cr.
ムにおいて、窪みをショットブラストによって形成し、
微***をパルスレーザ加工によって形成することを特徴
とする薄鋳片連続鋳造機用ドラム。3. The thin slab continuous casting machine drum according to claim 1, wherein the depression is formed by shot blasting.
A thin cast slab continuous casting machine drum characterized in that minute holes are formed by pulse laser processing.
ムを用いることを特徴とする薄鋳片連続鋳造方法。4. A method for continuously casting thin slabs, comprising using the drum for continuous casting of thin slabs according to claim 1.
いて、薄鋳片連続鋳造中の溶湯との非接触タイミング
に、前記微***を加工処理することを特徴とする薄鋳片
連続鋳造方法。5. The thin slab continuous casting method according to claim 4, wherein the minute holes are processed at a timing of non-contact with the molten metal during the thin slab continuous casting. Method.
Priority Applications (23)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000140315A JP3684136B2 (en) | 2000-05-12 | 2000-05-12 | Drum for thin slab continuous casting machine and thin slab continuous casting method |
| EP05006814A EP1582279A1 (en) | 2000-05-12 | 2001-05-11 | A continuous cast thin slab |
| CA002377876A CA2377876C (en) | 2000-05-12 | 2001-05-11 | Cooling drum for thin slab continuous casting, processing method and apparatus thereof, and thin slab and continuous casting method thereof |
| EP05006811A EP1595621B1 (en) | 2000-05-12 | 2001-05-11 | A cooling drum for thin slab continuous casting |
| AU56712/01A AU777752B2 (en) | 2000-05-12 | 2001-05-11 | Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor |
| DE60140321T DE60140321D1 (en) | 2000-05-12 | 2001-05-11 | COOLED CASTING ROLL FOR CONTINUOUS CASTING OF THIN PRODUCTS |
| KR1020057016118A KR100692499B1 (en) | 2000-05-12 | 2001-05-11 | Method of processing cooling drum for continuously casting thin cast piece |
| AT05006812T ATE375833T1 (en) | 2000-05-12 | 2001-05-11 | COOLED CASTING ROLL FOR CONTINUOUS CASTING OF THIN PRODUCTS AND CONTINUOUS CASTING PROCESSES |
| EP01930090A EP1281458B1 (en) | 2000-05-12 | 2001-05-11 | Cooling drum for continuously casting thin cast piece and continuous casting method therefor |
| US10/031,349 US6896033B2 (en) | 2000-05-12 | 2001-05-11 | Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor |
| EP05006813A EP1595622A1 (en) | 2000-05-12 | 2001-05-11 | A method of processing a cooling drum for metal cast strip by continuous casting and an apparatus therefor |
| ES01930090T ES2287125T3 (en) | 2000-05-12 | 2001-05-11 | COOLING DRUM FOR CONTINUOUS COLADA OF MOLDED THIN PIECES AND CONTINUOUS COLADA PROCEDURE FOR THE SAME. |
| KR1020057016119A KR100668126B1 (en) | 2000-05-12 | 2001-05-11 | Apparatus for processing cooling drum for continuously casting thin cast piece |
| DE60131034T DE60131034T3 (en) | 2000-05-12 | 2001-05-11 | COOLED CASTING ROLL FOR THE CONTINUOUS CONTINUOUS CASTING OF THIN PRODUCTS AND CONTINUOUS CASTING METHOD |
| EP05006812A EP1602424B2 (en) | 2000-05-12 | 2001-05-11 | A cooling drum for thin slab continuous casting and continuous casting method thereof |
| ES05006811T ES2333232T3 (en) | 2000-05-12 | 2001-05-11 | A COOLING DRUM FOR CONTINUOUS COLADA OF THICK IRON. |
| KR1020027000450A KR100668123B1 (en) | 2000-05-12 | 2001-05-11 | Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor |
| AT01930090T ATE361167T1 (en) | 2000-05-12 | 2001-05-11 | COOLED CASTING ROLL FOR CONTINUOUS CASTING OF THIN PRODUCTS AND CONTINUOUS STRONG CASTING PROCESS |
| DE60128217T DE60128217T2 (en) | 2000-05-12 | 2001-05-11 | COOLED CASTING ROLL FOR THE CONTINUOUS CONTINUOUS CASTING OF THIN PRODUCTS AND CONTINUOUS CASTING METHOD |
| ES05006812T ES2291995T5 (en) | 2000-05-12 | 2001-05-11 | A cooling drum for continuous thin plate casting and a continuous casting method with it |
| AT05006811T ATE446814T1 (en) | 2000-05-12 | 2001-05-11 | COOLED CASTING ROLL FOR CONTINUOUS CASTING OF THIN PRODUCTS |
| PCT/JP2001/003965 WO2001085369A1 (en) | 2000-05-12 | 2001-05-11 | Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor |
| US11/044,561 US7159641B2 (en) | 2000-05-12 | 2005-01-26 | Cooling drum for thin slab continuous casting, processing method and apparatus thereof, and thin slab and continuous casting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000140315A JP3684136B2 (en) | 2000-05-12 | 2000-05-12 | Drum for thin slab continuous casting machine and thin slab continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001321895A true JP2001321895A (en) | 2001-11-20 |
| JP3684136B2 JP3684136B2 (en) | 2005-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000140315A Expired - Lifetime JP3684136B2 (en) | 2000-05-12 | 2000-05-12 | Drum for thin slab continuous casting machine and thin slab continuous casting method |
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| Country | Link |
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| JP (1) | JP3684136B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005199348A (en) * | 2004-01-14 | 2005-07-28 | Km Europ Metal Ag | Cast-rolling facility |
| JP2009529425A (en) * | 2006-03-09 | 2009-08-20 | エス・エム・エス・ジーマーク・アクチエンゲゼルシャフト | Rollers for metal working, in particular continuous cast rollers, and methods for producing such rollers |
| CN102159341A (en) * | 2009-03-11 | 2011-08-17 | 新东工业株式会社 | Method for processing cavity surface of casting mold |
| US8122937B2 (en) | 2007-10-12 | 2012-02-28 | Nucor Corporation | Method of forming textured casting rolls with diamond engraving |
| JP2014004600A (en) * | 2012-06-22 | 2014-01-16 | Sumitomo Metal Mining Co Ltd | Method for boring metallic surface having metallic sheen, can roll having fine pore disposed by this method in outer peripheral surface and manufacturing method thereof, roll to roll surface processing device comprising can roll |
-
2000
- 2000-05-12 JP JP2000140315A patent/JP3684136B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005199348A (en) * | 2004-01-14 | 2005-07-28 | Km Europ Metal Ag | Cast-rolling facility |
| JP2009529425A (en) * | 2006-03-09 | 2009-08-20 | エス・エム・エス・ジーマーク・アクチエンゲゼルシャフト | Rollers for metal working, in particular continuous cast rollers, and methods for producing such rollers |
| US8122937B2 (en) | 2007-10-12 | 2012-02-28 | Nucor Corporation | Method of forming textured casting rolls with diamond engraving |
| CN102159341A (en) * | 2009-03-11 | 2011-08-17 | 新东工业株式会社 | Method for processing cavity surface of casting mold |
| CN102159341B (en) * | 2009-03-11 | 2014-09-10 | 新东工业株式会社 | Method for processing cavity surface of casting mold |
| JP2014004600A (en) * | 2012-06-22 | 2014-01-16 | Sumitomo Metal Mining Co Ltd | Method for boring metallic surface having metallic sheen, can roll having fine pore disposed by this method in outer peripheral surface and manufacturing method thereof, roll to roll surface processing device comprising can roll |
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|---|---|
| JP3684136B2 (en) | 2005-08-17 |
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