JPH08150442A - Roll for continuously casting metallic strip - Google Patents

Roll for continuously casting metallic strip

Info

Publication number
JPH08150442A
JPH08150442A JP29311194A JP29311194A JPH08150442A JP H08150442 A JPH08150442 A JP H08150442A JP 29311194 A JP29311194 A JP 29311194A JP 29311194 A JP29311194 A JP 29311194A JP H08150442 A JPH08150442 A JP H08150442A
Authority
JP
Japan
Prior art keywords
roll
thickness
cooling
plating
plating layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP29311194A
Other languages
Japanese (ja)
Inventor
Naotada Yoshida
直嗣 吉田
Fumio Kawahigashi
文雄 川東
Yoshihisa Shirai
善久 白井
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP29311194A priority Critical patent/JPH08150442A/en
Publication of JPH08150442A publication Critical patent/JPH08150442A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only

Abstract

PURPOSE: To provide a cooling roll for stable continuous casting by preventing the deterioration such as crack and, burning of the metallic strip. CONSTITUTION: The roll for continuous casting the strip, having 3-15μm the average surface roughness Ra on the roll surface is used. The roll surface has double structure of the plating lower layer and a plating surface layer, and the plating lower layer is made of Ni base alloy having 10-50μm thickness and the plating surface layer is made of Cr having 5-30μm thickness and the average surface roughness Ra of the plating surface layer is 3-15μm. The generation of meandering of the strip caused by the uneven solidification and fine recessed parts on the strip surface caused by the thermal deformation of the solidified shell are prevented and also, the deterioration such as softening, crack and burning on the roll surface during operation is prevented by hardened plating of the surface layer part and therefore, the strip having good surface characteristic can stably and continuously be cast.

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、溶融金属から直接、金
属薄板を連続鋳造する際に使用する冷却ロールに関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling roll used when continuously casting a thin metal sheet directly from a molten metal.

【0002】[0002]

【従来の技術】双ロール法、単ロール法などの金属薄板
の連続鋳造方法では、熱延工程の省略が可能であるた
め、従来の連続鋳造方法に比べ、製造コストを低減する
ことができるメリットがある。しかし、薄板鋳片では、
従来の連続鋳造方法によるスラブと比べ、鋳造後の下工
程の圧延率が小さいため、板厚変動や表面性状に対し高
度の品質が要求される。そこで、良質な薄板鋳片の製造
方法や製造装置が種々検討されている。
2. Description of the Related Art In a continuous casting method for a thin metal plate such as a twin roll method or a single roll method, the hot rolling step can be omitted, so that the manufacturing cost can be reduced as compared with the conventional continuous casting method. There is. However, in the thin plate slab,
Compared with conventional slabs produced by continuous casting, the rolling rate in the lower step after casting is small, so high quality is required for variations in plate thickness and surface properties. Therefore, various manufacturing methods and manufacturing apparatuses for high-quality thin plate slabs have been studied.

【0003】例えば特開昭60−184449号公報には、薄板
幅方向の凝固シェル厚を均一にするために、表面に深さ
4μm 以上の凹凸を均一分布させた冷却ドラムを用いる
ドラム式連鋳機が示されている。
For example, in JP-A-60-184449, a drum-type continuous casting using a cooling drum in which unevenness having a depth of 4 μm or more is evenly distributed on the surface in order to make the solidified shell thickness uniform in the width direction of the thin plate. Machine is shown.

【0004】特開昭62−254953号公報には、へこみ、鋳
じわおよび微小割れのない帯板を製造するために、表面
に深さ10〜200 μm の凹凸を設けた冷却ロールを用いる
双ロール式連鋳機が示されている。
Japanese Unexamined Patent Publication (Kokai) No. 62-254953 discloses a twin roll using a cooling roll having a surface with unevenness of 10 to 200 μm in order to manufacture a strip without dents, casting lines and fine cracks. A roll caster is shown.

【0005】特開平64(特開平1)−83340 号公報に
は、割れ、肉厚変動のない薄肉鋳片を製造するために、
直径 0.1〜1.2 mmの円または長円状の開口部をもち、深
さが5〜100 μm の窪みを互いに接することなく均一に
表面に分布させた冷却ドラムが示されている。
Japanese Unexamined Patent Publication (Kokai) No. 64-83340 discloses a method for producing a thin cast piece which is free from cracks and fluctuations in wall thickness.
Shown is a cooling drum with circular or oval openings of diameter 0.1-1.2 mm, with pits of depth 5-100 μm evenly distributed on the surface without touching each other.

【0006】特開平2−160145号公報には、表面性状の
優れた急冷薄帯を得るために、銅または銅合金製のロー
ル胴周面上に下地と表面との二層めっき層を備えた冷却
ロールが示されている。このロールでは、厚さ 0.1〜0.
4mm の下地めっき層は、Ni、Ni−W合金、Ni−W−Fe合
金からなり、厚さ0.01〜0.03mmの表面めっき層はCrであ
る。
Japanese Patent Laid-Open No. 2-160145 has a two-layer plating layer of a base and a surface on the peripheral surface of a roll cylinder made of copper or copper alloy in order to obtain a quenched ribbon having excellent surface properties. A chill roll is shown. For this roll, the thickness is 0.1-0.
The base plating layer having a thickness of 4 mm is made of Ni, Ni-W alloy or Ni-W-Fe alloy, and the surface plating layer having a thickness of 0.01 to 0.03 mm is Cr.

【0007】本発明者等は特開平5−154616号公報にお
いて、薄板の緩冷却を目的として、低熱伝導率で高温強
度に優れた材質のスリーブを用いる連続鋳造用冷却ロー
ルを開示した。
The inventors of the present invention have disclosed in Japanese Unexamined Patent Publication (Kokai) No. 5-154616 a cooling roll for continuous casting which uses a sleeve made of a material having low thermal conductivity and excellent high temperature strength for the purpose of slow cooling of a thin plate.

【0008】[0008]

【発明が解決しようとする課題】上記のような冷却ドラ
ムまたは冷却ロールには、なお、次の、のような問
題点がある。
The cooling drum or cooling roll as described above still has the following problems.

【0009】金属薄板の表面凹凸による形状不良およ
び凹凸に伴う割れ 冷却ロール表面の劣化 上記の金属薄板の鋳造時に発生する表面凹凸と表面割
れの形態は、下記A〜Cに分類される。
Defects due to surface irregularities of metal thin plates and cracks due to irregularities Deterioration of cooling roll surface The forms of surface irregularities and surface cracks that occur during casting of the above metal thin plates are classified into the following A to C.

【0010】A:凝固厚さの不均一を伴う大きな凹凸
で、大きな縦割れを伴う。
A: Large unevenness with uneven solidification thickness and large vertical cracks.

【0011】B:凝固厚さの不均一を伴う10〜50mm
間隔のうねりで、その起伏は50〜100μm 程度であ
り、縦割れおよび微小割れを伴う。
B: 10 to 50 mm with uneven solidification thickness
The undulations at intervals have undulations of about 50 to 100 μm and are accompanied by vertical cracks and microcracks.

【0012】C:凝固厚さはほぼ均一であるが、2〜5
mmピッチの深さ20〜30μm の微小凹みが亀甲状に生
成し、微小割れを伴う。
C: Solidification thickness is almost uniform, but 2 to 5
Minute recesses with a depth of 20 to 30 μm in mm pitch are formed in a hexagonal shape and are accompanied by minute cracks.

【0013】本発明者等の研究によると、これら欠陥の
形態はロール側の冷却条件により変化する。ロールから
の冷却が強冷却であるほど、凝固シェル表面の熱応力が
大きく、かつ凝固初期に凝固シェルの変形が生じ始める
ために、ロールと凝固シェルの間の冷却むらが生じて不
均一凝固が助長され、凹凸の深さおよび間隔が大きくな
る。
According to the research conducted by the present inventors, the morphology of these defects changes depending on the cooling conditions on the roll side. The stronger the cooling from the roll, the greater the thermal stress on the surface of the solidified shell, and the deformation of the solidified shell begins to occur in the early stages of solidification, resulting in uneven cooling between the roll and the solidified shell, resulting in non-uniform solidification. It is promoted, and the depth and interval of the unevenness are increased.

【0014】ロールからの冷却を緩和していくと凝固シ
ェル表面の熱応力は小さくなり、かつ凝固シェルの変形
開始が遅くなるために、不均一凝固は抑制され、凹凸の
深さおよび間隔はともに小さくなる。すなわち、表面が
平滑な冷却ロールで鋳造した場合、凝固初期はロールと
凝固シェルの接触が密であるために強冷却となって凝固
の不均一が生じ、金属薄板表面には上記形態Aの大きな
凹凸および縦割れが発生する。この形態A欠陥は、ある
程度の緩冷却を行うことにより、不均一凝固による薄板
表面の凹凸の間隔が狭くなって解消するが、上記形態B
の縦割れ、微小割れを伴ううねりが生じる。形態Bの欠
陥は、さらに緩冷却を行うことにより凝固厚さがほぼ均
一となり解消する。
When the cooling from the roll is alleviated, the thermal stress on the surface of the solidified shell becomes small and the start of deformation of the solidified shell is delayed, so that the uneven solidification is suppressed and both the depth and the interval of the unevenness are reduced. Get smaller. That is, when casting is performed with a cooling roll having a smooth surface, in the initial stage of solidification, the roll and the solidification shell are in close contact with each other, resulting in strong cooling and nonuniformity of solidification. Unevenness and vertical cracks occur. This form A defect is eliminated by performing a moderate cooling to a certain extent so that the interval between the unevenness of the thin plate surface due to the non-uniform solidification becomes narrower.
Waviness with vertical cracks and micro cracks occurs. The defect of form B can be eliminated by further cooling slowly so that the solidified thickness becomes almost uniform.

【0015】前記従来技術(特開昭60−184449号公報、
特開昭62−254953号公報)は、冷却ロール表面に凹凸あ
るいは凹みを分布させて部分的にエアギャップを媒体と
する熱抵抗を生じさせることで、また、特開平5−1546
16号公報の方法は、低熱伝導率の高温強度に優れた材料
のロールを使用することで、それぞれ緩冷却を行うもの
であり、これらの方法で上記AおよびBの形態の欠陥を
防止することは可能である。
The above-mentioned prior art (JP-A-60-184449,
Japanese Unexamined Patent Publication (Kokai) No. 62-254953) discloses that unevenness or dents are distributed on the surface of a cooling roll to partially generate thermal resistance using an air gap as a medium.
The method of Japanese Patent No. 16 is to perform gentle cooling by using a roll of a material having a low thermal conductivity and excellent in high temperature strength, and to prevent defects of the forms A and B by these methods. Is possible.

【0016】しかしこれらの従来技術では、前記形態C
の微小割れを伴う亀甲状凹み欠陥を防止するのに十分な
効果が得られない。形態Cの亀甲状凹みは深さ20〜3
0μm で、形状、外観上はほとんど問題にならない程度
であるが、凹み部分の一部に局所的に生じる微小割れの
ため製品品質を著しく損ねるので、その防止が重要な課
題である。
However, in these prior arts, the form C is used.
Sufficient effect cannot be obtained to prevent the hexagonal pit defect associated with micro cracking. Form C turtle-shaped dents have a depth of 20-3
At 0 μm, there is almost no problem in terms of shape and appearance, but the quality of the product is remarkably impaired due to minute cracks locally generated in a part of the recessed part, so prevention thereof is an important issue.

【0017】前記の冷却ロール表面の劣化による問題
点は次のとおりである。
The problems caused by the deterioration of the surface of the cooling roll are as follows.

【0018】表面性状の良好な金属薄板を安定して連続
鋳造するには、所定の冷却ロール表面状態を維持するこ
とが重要であるが、前記従来技術のロール表面の劣化対
策は未だ不十分である。たとえば、特開平64(特開平
1)−83340 号公報の実施例では、スリーブ表面にNi
めっき層が形成され、その表面に凹みが形成されている
が、Niめっき層が軟質であるため、操業中、金属薄板
との接触によりロール表面の凹みが消失し、その効果が
失われるばかりでなく、ロール表面に周方向の引っかき
傷が生じ、金属薄板の表面品質を損ねる恐れがある。
In order to stably and continuously cast a metal thin plate having a good surface quality, it is important to maintain a predetermined cooling roll surface state, but the above-mentioned conventional measures for roll surface deterioration are still insufficient. is there. For example, in the embodiment of JP-A-64-83340, Ni is not formed on the sleeve surface.
A plating layer is formed and a dent is formed on the surface, but since the Ni plating layer is soft, the dent on the roll surface disappears due to contact with the thin metal plate during operation, and the effect is not only lost. However, the roll surface may be scratched in the circumferential direction, and the surface quality of the thin metal plate may be impaired.

【0019】特開平2−160145号公報の二層めっき冷却
ロールでは、高ケイ素薄鋼帯を鋳造する場合のロール表
面劣化防止および鋼帯表面性状の向上は可能であるが、
厚さが1mmを超えるステンレス鋼板を鋳造する場合に
は、ロールからの冷却が強冷却であるために前記形態A
またはBの欠陥が生じる。
The double-layer plating cooling roll disclosed in JP-A-2-160145 can prevent roll surface deterioration and improve steel strip surface properties when casting a high silicon thin steel strip.
In the case of casting a stainless steel plate having a thickness of more than 1 mm, the cooling from the roll is strong cooling, so that the form A is used.
Or a defect of B occurs.

【0020】本発明の目的は、特に金属薄板表面の形態
C欠陥の発生および操業中の冷却ロール表面の軟化、亀
裂、焼き付き等の劣化を防止するとともに、安定した連
続鋳造を実現することができる冷却ロールを提供するこ
とにある。
The object of the present invention is to prevent the occurrence of Form C defects on the surface of a thin metal plate and the deterioration of the softening, cracking, and seizure of the cooling roll surface during operation, and to realize stable continuous casting. It is to provide a cooling roll.

【0021】[0021]

【課題を解決するための手段】本発明は、次の (1)、
(2) の金属薄板の連続鋳造用ロールを要旨とする。
The present invention provides the following (1),
The gist is the roll for continuous casting of thin metal plate in (2).

【0022】(1)溶融金属をロール周表面で凝固させて
金属薄板を連続鋳造する際に用いる冷却ロールであっ
て、ロール表面の平均表面粗さRa が3〜15μm であ
ることを特徴とする薄板鋳片の連続鋳造用ロール。
(1) A cooling roll used when solidifying a molten metal on the peripheral surface of a roll to continuously cast a thin metal plate, characterized in that the roll surface has an average surface roughness Ra of 3 to 15 μm. Roll for continuous casting of thin plate slabs.

【0023】(2)上記(1) の冷却ロールであって、ロー
ル表面は下層めっき層と表層めっき層との二層構造を有
し、下層めっき層は厚さ10〜50μm のNi系合金、
表層めっき層は厚さ5〜30μm のCrからなり、表層
めっき層表面の平均表面粗さRa が3〜15μm である
ことを特徴とする金属薄板の連続鋳造用ロール。
(2) The cooling roll of (1) above, wherein the roll surface has a two-layer structure of a lower plating layer and a surface plating layer, the lower plating layer being a Ni-based alloy having a thickness of 10 to 50 μm,
The surface-plated layer is made of Cr having a thickness of 5 to 30 μm, and the average surface roughness Ra of the surface of the surface-plated layer is 3 to 15 μm.

【0024】上記の下層めっき層のNi系合金は、Ni−
W合金、Ni−P合金、Ni−B合金、Ni−W−B合金のい
ずれかとするのが望ましい。
The Ni-based alloy of the lower plating layer is Ni-
It is desirable to use any one of W alloy, Ni-P alloy, Ni-B alloy, and Ni-WB alloy.

【0025】本発明ロールの母材材質は問わないが、
銅、銅合金またはNiめっきを施した銅、銅合金とする
のが望ましい。
The base material of the roll of the present invention is not limited,
It is preferable to use copper, a copper alloy, copper plated with Ni, or a copper alloy.

【0026】[0026]

【作用】本発明のロールを用いる金属薄板連続鋳造装置
の構成例を、図1〜図3により説明する。
An example of the structure of a continuous casting apparatus for thin metal plates using the roll of the present invention will be described with reference to FIGS.

【0027】図1は、単ロール式連鋳機を示す側面方向
の縦断面図である。矢印の方向に回転する冷却式単ロー
ル4に隣接して設けられたタンディッシュ5内の溶鋼6
を、所定の厚さの金属薄板7が得られる速度で連続供給
し、この速度と一定関係を有する速度で回転する冷却式
単ロール4上に注ぎながら、連続的に金属薄板7を鋳造
する。
FIG. 1 is a vertical cross-sectional view in a side direction showing a single roll type continuous casting machine. Molten steel 6 in a tundish 5 provided adjacent to a cooling single roll 4 rotating in the direction of the arrow
Is continuously supplied at a speed at which a metal thin plate 7 having a predetermined thickness is obtained, and the metal thin plate 7 is continuously cast while being poured onto a cooling type single roll 4 rotating at a speed having a constant relationship with this speed.

【0028】図2は、双ロール横注ぎ式連鋳機を示す側
面方向の縦断面図である。この方式では、溶鋼6はタン
ディッシュ5から上方の冷却ロール8と下方の冷却ロー
ル9との間の一定間隙に供給され、双方のロールで冷却
される。
FIG. 2 is a vertical cross-sectional view in a side direction showing a twin roll horizontal pouring type continuous casting machine. In this system, the molten steel 6 is supplied from the tundish 5 to a constant gap between the upper cooling roll 8 and the lower cooling roll 9 and cooled by both rolls.

【0029】図3は、双ロール上注ぎ式連鋳機法を示す
側面方向の縦断面図である。この方式では、溶鋼6はタ
ンディッシュを経ずに直接、同径の冷却ロール10間の一
定間隙に供給され、双方のロールで冷却される。
FIG. 3 is a vertical sectional view in a side direction showing a twin roll top pouring type continuous casting machine method. In this method, the molten steel 6 is directly supplied to the constant gap between the cooling rolls 10 having the same diameter without passing through the tundish, and is cooled by both rolls.

【0030】本発明のロールは、冷却ロールを用いる金
属薄板連続鋳造装置であれば、双ロール法、単ロール法
のいずれにも、また、溶湯供給の方法(上注ぎ、下注
ぎ、横注ぎ、斜め上注ぎ、斜め下注ぎ)の種類を問わ
ず、いずれにも適用できる。
The roll of the present invention may be a twin-roll method or a single-roll method as long as it is a continuous casting apparatus for thin metal plates using a cooling roll, and a method of supplying molten metal (top pouring, bottom pouring, side pouring, It can be applied to any of the above types, such as obliquely upward pouring and obliquely downward pouring.

【0031】次に、本発明ロールを前記のように限定し
た理由とその作用効果にについて説明する。
Next, the reason why the roll of the present invention is limited as described above and its function and effect will be explained.

【0032】金属薄板の表面凹凸やうねりの起点は、冷
却ロール側からの冷却により凝固シェル表層部に熱応力
が生じ、凝固シェルが変形することにある。すなわち、
ロールと変形したシェルとの間の接触が不均一となる
と、凝固の不均一が生じる。ロールと密に接触した金属
薄板表面の凸部分では、凝固が更に進行して厚いシェル
が生成するが、ロールと離れた金属薄板表面の凹部分で
は凝固が遅れてシェル厚は薄くなり、厚さの不均一が生
じる。また、金属薄板表面の凹み部分は、高温で脆弱で
あり、応力集中による割れが生じやすい。
The starting point of surface irregularities and waviness of the thin metal plate is that thermal stress is generated in the surface layer of the solidified shell due to cooling from the cooling roll side and the solidified shell is deformed. That is,
Non-uniform contact between the roll and the deformed shell results in non-uniform solidification. In the convex part of the surface of the thin metal plate that is in close contact with the roll, solidification progresses further to form a thick shell, but in the concave part of the surface of the thin metal plate that is away from the roll, solidification is delayed and the shell thickness becomes thin. Non-uniformity occurs. In addition, the recessed portion of the surface of the thin metal plate is fragile at high temperatures, and cracks easily occur due to stress concentration.

【0033】そして、金属薄板表面の凹凸の大きさや形
状はロールの冷却条件により左右されること、およびそ
れらの欠陥の形態と発生原因は、前述のとおりである。
The size and shape of the irregularities on the surface of the thin metal plate depend on the cooling conditions of the roll, and the forms and causes of these defects are as described above.

【0034】本発明の目的の一つは、前述の形態C欠陥
の発生を防止することにある。このためには、ロール表
面の平均表面粗さRa の範囲を3〜15μm にするのが
効果的である。すなわち、ロール表面を所定粗さに粗面
化し、ロール表面凹部のエアギャップを形成させること
による緩冷却効果、およびロール表面凸部によって金属
薄板の亀甲状凹み間隔よりも狭い間隔で金属薄板表面に
微小凹凸を積極的に付与する凹凸転写に基づく熱変形抑
制効果により、上記C欠陥の発生を防止することができ
る。
One of the objects of the present invention is to prevent the occurrence of the above-mentioned form C defect. To this end, it is effective to set the range of the average surface roughness Ra of the roll surface to 3 to 15 μm. That is, the surface of the roll is roughened to a predetermined roughness, and the gentle cooling effect by forming the air gap of the roll surface concave portion, and the roll surface convex portion is applied to the metal thin plate surface at an interval narrower than the hexagonal concave interval of the metal thin plate. The C defect can be prevented by the effect of suppressing thermal deformation based on the uneven transfer that positively imparts fine unevenness.

【0035】上記のように、ロール表面の平均表面粗さ
Ra の範囲を3〜15μm とした理由を、図4により詳
細に説明する。
The reason why the range of the average surface roughness Ra of the roll surface is set to 3 to 15 μm as described above will be explained in detail with reference to FIG.

【0036】まず、種々の平均表面粗さを有するロール
を用いて連続鋳造試験を行い、ロール表面の平均表面粗
さと金属薄板の平均表面粗さとの関係について検討し
た。図4はこの関係を示す図である。
First, a continuous casting test was conducted using rolls having various average surface roughness, and the relationship between the average surface roughness of the roll surface and the average surface roughness of the metal thin plate was examined. FIG. 4 is a diagram showing this relationship.

【0037】粗面化したロール表面には、凹み部のエア
ギャップが存在するために、溶鋼が完全に侵入しない。
すなわち、ロール表面の凹凸形状がそのまま金属薄板表
面に転写されるわけではない。ロール表面の平均表面粗
さをRa(x)、金属薄板表面の平均表面粗さをRa(y)とす
ると、両者の間には下記に示す式の関係がある。
On the roughened roll surface, the molten steel does not completely penetrate because of the air gap of the recess.
That is, the uneven shape of the roll surface is not directly transferred to the surface of the thin metal plate. Assuming that the average surface roughness of the roll surface is Ra (x) and the average surface roughness of the metal thin plate surface is Ra (y), there is a relation of the following equation between them.

【0038】Ra(y)=(a/100)×Ra(x)+b ここで、aはロールの表面粗さが金属薄板の表面粗さに
転写される程度、すなわち転写率(%)を示し、bは凝
固シェル表面の熱収縮により生じた金属薄板表面の微小
凹凸による粗さ(μm)である。図4に示すように、転写
率aは20〜30%、粗さbは1.0μm である。ま
た、金属薄板表面の前記形態C欠陥、すなわち、亀甲状
凹みに伴う微小割れは、金属薄板表面の平均表面粗さR
a(y)が1.8μm 以上では生じない。一方、金属薄板表
面の平均表面粗さがRa(y)が5.0μm を超えると、ロ
ール表面の凹凸の転写により生じた金属薄板表面の凹み
の一部に微小割れが生じる。よって、微小割れが生成し
ない適正な金属薄板表面の平均表面粗さRa(y)の範囲
は、1.8〜5.0μm である。
Ra (y) = (a / 100) × Ra (x) + b where a represents the degree to which the surface roughness of the roll is transferred to the surface roughness of the thin metal plate, that is, the transfer rate (%). , B are roughnesses (μm) due to minute irregularities on the surface of the thin metal plate caused by thermal contraction of the surface of the solidified shell. As shown in FIG. 4, the transfer rate a is 20 to 30% and the roughness b is 1.0 μm. Further, the above-mentioned morphology C defect on the surface of the metal thin plate, that is, the microcracks associated with the hexagonal recess, is the average surface roughness R of the surface of the metal thin plate.
It does not occur when a (y) is 1.8 μm or more. On the other hand, when the average surface roughness Ra (y) of the metal thin plate surface exceeds 5.0 μm, minute cracks are generated in some of the dents on the metal thin plate surface caused by the transfer of irregularities on the roll surface. Therefore, the range of the average surface roughness Ra (y) of the appropriate metal thin plate surface where no microcracks are generated is 1.8 to 5.0 μm.

【0039】更に詳細に調査した結果、これらの健全な
金属薄板の表面には、約0.5mm間隔で深さ10〜20
μm の微小凹みが存在することがわかった。この微小凹
みは、金属薄板の表面品質を劣化させるものではなく、
ロール表面の凹凸が積極的に転写されたものであり、約
0.5mmの凹み間隔は前記欠陥形態Cの亀甲状凹み間隔
の1/4〜1/10に相当する。すなわち、C欠陥にお
ける亀甲状凹み間隔の1/4〜1/10に相当する約
0.5mm間隔で、深さ10〜20μm の微小凹みを金属
薄板側に積極的に付与すれば、亀甲状凹み変形が抑制さ
れることに加え、金属薄板に転写された凹 凹間隔が十
分に狭いため、金属薄板表面の微小凹み部への応力集中
が抑制される。また、熱変形で生じた亀甲状凹みは、ロ
ールから離れるために局所的に復熱して脆弱な高温部と
なり、この凹部では微小割れが発生しやすいが、ロール
粗面から転写された金属薄板表面の微小凹みは、ロール
表面凸部と密に接触しているためによく冷却され、局所
的な復熱がなく微小割れは発生しない。
As a result of further detailed investigation, the surface of these sound metal thin plates has a depth of 10 to 20 at intervals of about 0.5 mm.
It was found that there were microscopic depressions of μm. This minute depression does not deteriorate the surface quality of the thin metal plate,
The unevenness of the roll surface was positively transferred, and the recess interval of about 0.5 mm corresponds to 1/4 to 1/10 of the glaze-like recess interval of the defect form C. That is, if minute recesses having a depth of 10 to 20 μm are positively provided on the thin metal plate side at intervals of about 0.5 mm, which corresponds to 1/4 to 1/10 of the interval of the hexagonal recesses in the C defect, the hexagonal recesses will be formed. In addition to suppressing deformation, the gap between the recesses transferred to the thin metal plate is sufficiently narrow, so that stress concentration on the minute recesses on the surface of the thin metal plate is suppressed. In addition, the hexagonal dent caused by thermal deformation locally recovers heat from the roll and becomes a fragile high temperature part, and minute cracks are likely to occur in this dent, but the surface of the metal thin plate transferred from the rough surface of the roll The minute dents are well-cooled because they are in close contact with the convex portions on the roll surface, and there is no local recuperation and no minute cracks occur.

【0040】微小凹みをロール粗面から積極的に転写さ
せるには、ロール側の平均表面粗さを調整し、金属薄板
に所定の間隔と深さの凹みを付与することが重要であ
る。図4に示すように、ロールから金属薄板への表面粗
さの転写率aが20〜30%程度であることから、ロー
ル表面の平均表面粗さRa の範囲は3〜15μm が適当
である。
In order to positively transfer the minute recesses from the rough surface of the roll, it is important to adjust the average surface roughness on the roll side and provide the metal thin plate with recesses having a predetermined interval and depth. As shown in FIG. 4, since the transfer rate a of the surface roughness from the roll to the thin metal plate is about 20 to 30%, the average surface roughness Ra of the roll surface is preferably 3 to 15 μm.

【0041】平均表面粗さRa が3μm 未満では、金属
薄板表面に生成する亀甲状の凹みの十分な防止効果が得
られない。一方、Ra が15μm を超えると、金属薄板
表面へロール表面の凹凸が転写されるため、金属薄板表
面粗度が大きくなり、品質上好ましくなく、ロール粗面
の転写により生じた金属薄板表面の凹み部を起点とする
微小割れが生じる場合もある。
If the average surface roughness Ra is less than 3 μm, the effect of sufficiently preventing the hexagonal dents formed on the surface of the thin metal plate cannot be obtained. On the other hand, when Ra exceeds 15 μm, the unevenness of the roll surface is transferred to the surface of the metal thin plate, the surface roughness of the metal thin plate becomes large, which is not desirable in terms of quality, and the dent on the surface of the metal thin plate caused by the transfer of the rough surface of the roll In some cases, microcracks may start from the part.

【0042】図4に示すように、ロールの平均表面粗さ
の転写率aは20〜30%の幅があるので、亀甲状凹み
の防止効果を安定して得るために特に望ましいロール表
面の平均表面粗さRa の範囲は、5〜10μm である。
As shown in FIG. 4, since the transfer rate a of the average surface roughness of the roll has a range of 20 to 30%, the average of the roll surface which is particularly desirable in order to stably obtain the hexagonal depression prevention effect. The surface roughness Ra is in the range of 5 to 10 μm.

【0043】図5は、本発明の一例として、平均表面粗
さRa が5μm のロール表面の粗さを示す図である。本
発明ロールの表面の凹凸は、ロールの周方向または軸方
向を問わず、図示するような形状である。
FIG. 5 is a diagram showing the roughness of the roll surface having an average surface roughness Ra of 5 μm as an example of the present invention. The irregularities on the surface of the roll of the present invention have a shape as illustrated, regardless of the circumferential direction or axial direction of the roll.

【0044】亀甲状凹みを防止するには、亀甲状凹みの
ピッチ2〜5mmの1/4〜1/10の約0.5mm間隔の
凹みを、金属薄板表面に積極的に付与することが有効で
あるが、転写率を考慮してロール表面の凸−凸の間隔
は、0.05〜0.25mm程度とするのが望ましい。
In order to prevent the hexagonal dents, it is effective to positively give the dents of the hexagonal dents 1/4 to 1/10 of the pitch of 2 to 5 mm at intervals of about 0.5 mm to the surface of the metal sheet. However, in consideration of the transfer rate, it is desirable that the interval between the protrusions and protrusions on the roll surface is about 0.05 to 0.25 mm.

【0045】次にロール表面の下層めっきおよび表層め
っきについて説明する。
Next, lower layer plating and surface layer plating on the roll surface will be described.

【0046】表面性状の良好な金属薄板を安定して連続
鋳造するには、所定の上記ロール表面状態を維持するこ
とが重要である。しかし、ロール表面が軟質であれば、
操業中にロール表面状態が変化し、その効果が失われる
ばかりでなく、ロール表面に周方向の引っかき傷が生
じ、金属薄板の表面品質を損ねる恐れがある。操業中の
ロール表面の軟化、亀裂、焼き付き等の劣化を防止する
には、下記の硬質めっき処理を施すのが有効である。
In order to stably continuously cast a metal thin plate having a good surface condition, it is important to maintain the predetermined roll surface state. However, if the roll surface is soft,
During operation, not only the surface condition of the roll changes and its effect is lost, but also the surface of the roll is scratched in the circumferential direction, which may impair the surface quality of the thin metal plate. In order to prevent deterioration such as softening, cracking, and seizure of the roll surface during operation, it is effective to perform the following hard plating treatment.

【0047】図6は冷却ロール表面の硬質めっき層を示
すロール表層部の縦断面図である。
FIG. 6 is a longitudinal sectional view of the roll surface layer showing the hard plating layer on the surface of the cooling roll.

【0048】図中、符号1は表層めっき層、2は下層め
っき層、3はロール母材を示す。
In the figure, reference numeral 1 is a surface plating layer, 2 is a lower plating layer, and 3 is a roll base material.

【0049】ロール表面の硬質めっき層は、下層めっき
層2と表層めっき層1との二層からなる。下層めっき層
2は、P、B、Fe、Co、CuおよびWのうちの1〜
2元素を含むNi系合金を用いて一層あるいは多層にめっ
きし、厚さを10〜50μmとする。これらのNi系合金
のなかでも、Ni−W合金、Ni−P合金、Ni−B合金、Ni
−W−B合金のいずれかが、高温でも高硬度であるため
好適である。表層めっき層1は、Crめっきを施し、厚さ
を5〜30μm とする。
The hard plating layer on the roll surface is composed of two layers, a lower plating layer 2 and a surface plating layer 1. The lower plating layer 2 is one of P, B, Fe, Co, Cu and W.
A Ni-based alloy containing two elements is used to plate one layer or multiple layers to a thickness of 10 to 50 μm. Among these Ni-based alloys, Ni-W alloy, Ni-P alloy, Ni-B alloy, Ni
One of the -WB alloys is preferable because it has high hardness even at high temperatures. The surface plating layer 1 is Cr-plated and has a thickness of 5 to 30 μm.

【0050】下層めっき層2の上記Ni系合金は、高温で
高硬度であり、ロール表面の軟化を防止し、所定の平均
表面粗さRa を維持するのに有効である。その厚さが1
0μm 未満では軟化防止効果が得られず、表面凹凸が変
形する。一方、50μm を超えると、下層めっき層が厚
すぎるため表層のCrめっき層の温度が上昇し、Crめっき
層表面の熱応力が増大してめっき層表面に亀裂が生ず
る。
The above Ni-based alloy of the lower plating layer 2 has high hardness at high temperature, is effective in preventing softening of the roll surface and maintaining a predetermined average surface roughness Ra. Its thickness is 1
If it is less than 0 μm, the effect of preventing softening cannot be obtained and the surface irregularities are deformed. On the other hand, if it exceeds 50 μm, the temperature of the surface Cr plating layer rises because the lower plating layer is too thick, the thermal stress on the surface of the Cr plating layer increases, and cracks occur on the surface of the plating layer.

【0051】下層めっき層2は一層でもよいが、多層、
例えばNi−B合金とNi−W合金との二層にすると、めっ
き層内の熱応力を緩和し、ロール寿命がより向上する効
果がある。
The lower plating layer 2 may be a single layer,
For example, if the Ni-B alloy and the Ni-W alloy are formed into two layers, the thermal stress in the plating layer is relaxed, and the roll life is further improved.

【0052】表層めっき層のCrは、下層めっき層のNi系
合金が金属薄板と焼き付くのを防止する。その厚さが5
μm 未満では、焼き付き防止効果が得られない。一方、
30μm を超えるとCrめっき層の温度が上昇し、Crめっ
き層表面の熱応力が増大してめっき層表面に亀裂が生ず
る。
Cr in the surface plating layer prevents the Ni-based alloy in the lower plating layer from sticking to the thin metal plate. Its thickness is 5
If it is less than μm, the anti-seizure effect cannot be obtained. on the other hand,
If it exceeds 30 μm, the temperature of the Cr plating layer rises, the thermal stress on the surface of the Cr plating layer increases, and cracks occur on the surface of the plating layer.

【0053】したがって、硬質めっき層の総厚さの範囲
は15〜80μm が適当である。望ましい総厚さの範囲
は20〜70μm である。
Therefore, it is appropriate that the total thickness of the hard plating layer is 15 to 80 μm. The preferred total thickness range is 20-70 μm.

【0054】本発明ロールの母材としては、ステンレス
鋼やNi基合金などの、通常、ロールに用いられる耐熱
合金材料のスリーブも用いることができるが、効率的な
冷却を行うため、熱伝導率に優れた銅あるいは銅合金の
スリーブを用いるのが最もよい。この他に、銅あるいは
銅合金の表面保護および冷却能の調整のため、予めロー
ルの母材の表面に下地めっきとしてNiめっき層を設け
てもよい。下地めっきを施す場合の望ましいNiめっき
層厚さの上限は3mmである。銅あるいは銅合金やNiは
軟質であるため、ロール表面の所定の粗面加工、例えば
ショットブラストのような機械的な方法による粗面加工
が容易である。
As the base material of the roll of the present invention, a sleeve made of a heat-resistant alloy material such as stainless steel or Ni-base alloy, which is usually used for rolls, can be used. It is best to use a superior copper or copper alloy sleeve. In addition to this, in order to protect the surface of the copper or copper alloy and adjust the cooling ability, a Ni plating layer may be previously provided as a base plating on the surface of the base material of the roll. The upper limit of the desirable Ni plating layer thickness when performing undercoating is 3 mm. Since copper, a copper alloy, or Ni is soft, it is easy to perform a predetermined surface roughening on the roll surface, for example, a mechanical method such as shot blasting.

【0055】ロール母材として前記の耐熱合金材料を用
いる場合は、銅系のものと緩冷却の程度を同等とするた
めに、スリーブ厚さは銅系の20〜40%程度とするの
が望ましい。
When the above heat-resistant alloy material is used as the roll base material, the sleeve thickness is preferably 20 to 40% of that of the copper-based material in order to make the degree of slow cooling equal to that of the copper-based material. .

【0056】表層部の硬質めっき処理は、予め所定の表
面粗面化加工をした後、施工するのが望ましい。硬質め
っき処理後の粗面加工は不可能ではないが、硬質のため
加工が難しいことに加え、表層めっきに亀裂等の損傷を
与える恐れ、あるいは加工時の残留応力のため、使用時
に亀裂が生じる恐れがある。
The hard plating treatment of the surface layer portion is preferably carried out after a predetermined surface roughening treatment in advance. Rough surface processing is not impossible after hard plating treatment, but it is difficult to process because it is hard, and it may cause damage such as cracks on the surface layer plating, or cracks occur during use due to residual stress during processing There is a fear.

【0057】ロール表面を粗面化加工した後、硬質めっ
きを施す際には、施工前後の表面粗さの変化に留意し、
ロール表面の最終仕上粗さが所定の平均表面粗さRa 3
〜15μm の範囲となるようにすることが重要である。
総厚さ15〜80μm の硬質めっき処理後の平均表面粗
さは、処理前の平均表面粗さに比べ約10%大きくな
る。このため、硬質めっき処理前の平均表面粗さRa が
2.7〜13.5μm となるように、予め粗面化してお
く必要がある。
When applying hard plating after roughening the surface of the roll, pay attention to the change in surface roughness before and after construction,
The final finish roughness of the roll surface is a predetermined average surface roughness Ra 3
It is important that the thickness is in the range of -15 μm.
The average surface roughness after the hard plating treatment with a total thickness of 15 to 80 μm is about 10% larger than the average surface roughness before the treatment. Therefore, it is necessary to roughen the surface in advance so that the average surface roughness Ra before the hard plating treatment is 2.7 to 13.5 μm.

【0058】本発明ロールの表面粗加工方法の一例とし
ては、Niめっきを施した銅合金製のロールをショット
ブラストで平均表面粗さRa が2.7〜13.5μm と
なるように機械的に粗面化する。次に、厚さ10〜50
μm のNi合金めっきを施し、更に厚さ5〜30μm の
Crめっきを施す。このようにして、最終仕上面の平均
表面粗さRa が所定の3〜15μm の範囲にある本発明
のロールとする。
As an example of the surface roughening method of the roll of the present invention, a Ni alloy-plated copper alloy roll is mechanically mechanically shot-blasted so that the average surface roughness Ra becomes 2.7 to 13.5 μm. Roughen. Next, thickness 10-50
A Ni alloy plating having a thickness of 5 μm is applied, and a Cr plating having a thickness of 5 to 30 μm is applied. In this way, the roll of the present invention has an average surface roughness Ra of the final finished surface within a predetermined range of 3 to 15 μm.

【0059】本発明ロールの冷却には、内部水冷方式を
適用するのが望ましい。また、操業中、本発明ロールの
効果を持続させるために、ロール表面のブラッシングを
行ってもよい。本発明ロールは、ステンレス鋼のみなら
ず、炭素鋼、高合金、非鉄金属などを対象材としても、
同様の効果を期待することができる。
For cooling the roll of the present invention, it is desirable to apply an internal water cooling system. Further, during operation, in order to maintain the effect of the roll of the present invention, the roll surface may be brushed. The roll of the present invention is not limited to stainless steel, but also carbon steel, high alloys, non-ferrous metals and the like,
The same effect can be expected.

【0060】[0060]

【実施例】【Example】

(試験1)図1に示す単ロール式連鋳機を用いて、厚さ
1.0mm×幅250mmのステンレス鋼SUS304の金
属薄板を鋳造速度50 m/min で製造した。冷却ロール
は厚さ2mmのNiめっきを施した銅合金製スリーブ(厚
さ30mm)を母材とし、ショットブラストによる粗面加
工、表1に示す所定の硬質めっきを施工した。ロールの
直径は600mm、胴長は400mm、ロール内部は水冷構
造である。ロールの冷却は、スリーブ内面側に設けた冷
却溝に流速8 m/s で水を流して行った。表1に金属薄
板の性状とロール表面の損傷を示す。
(Test 1) Using the single roll type continuous casting machine shown in FIG. 1, a thin metal plate of stainless steel SUS304 having a thickness of 1.0 mm and a width of 250 mm was manufactured at a casting speed of 50 m / min. The cooling roll was made of a copper alloy sleeve (thickness: 30 mm) plated with Ni having a thickness of 2 mm, roughened by shot blasting, and subjected to predetermined hard plating shown in Table 1 by shot blasting. The roll has a diameter of 600 mm, a body length of 400 mm, and a water-cooled structure inside the roll. The roll was cooled by flowing water at a flow rate of 8 m / s into a cooling groove provided on the inner surface side of the sleeve. Table 1 shows the properties of the thin metal plate and the damage on the roll surface.

【0061】[0061]

【表1】 [Table 1]

【0062】表1に示す金属薄板表面の不均一度CVお
よび凹みは、次の定義によった。
The non-uniformity CV and dents on the surface of the metal thin plate shown in Table 1 are defined as follows.

【0063】CV(%)=〔(厚さの標準偏差)/(厚
さの平均値)〕×100 良 : CV<10 やや不良:10≦CV<15 不良 :15≦CV 金属薄板表面形凹みの分類 A:縦割れを伴う大きな凹凸 B:10〜50mmピッチ、起伏50〜100μm のうね
り C:2〜5mmピッチ、深さ20〜30μm の亀甲状凹み 表1に示すように、本発明で定める範囲のロール表面粗
さおよび硬質めっき条件では、金属薄板表面の凹みや微
小割れは皆無であり、使用後のロール表面の損傷もなか
った。
CV (%) = [(standard deviation of thickness) / (average of thickness)] × 100 Good: CV <10 Slightly bad: 10 ≦ CV <15 Bad: 15 ≦ CV Metal thin plate surface dent Classification A: Large unevenness with vertical cracks B: 10 to 50 mm pitch, undulation of 50 to 100 μm undulation C: 2 to 5 mm pitch, 20 to 30 μm depth hexagonal recesses As shown in Table 1, determined by the present invention. Under the roll surface roughness and hard plating conditions in the ranges, there was no dent or microcrack on the surface of the thin metal plate, and there was no damage on the roll surface after use.

【0064】ロール表面粗さを平均表面粗さRa で2.
5μm 以下とした比較例では、金属薄板厚さの不均一や
表面の凹みが生じた。また、Ra で20μm とした比較
例では、ロール粗面の凹凸転写により金属薄板表面の粗
さが大きくなり、表面凹み部を起点とする微小割れが発
生し、表面品質が悪化した。更に、硬質めっき層の厚さ
が本発明の範囲外の比較例では、操業中に表面傷、焼付
き、軟化、亀裂等が発生してロール表面が劣化し、安定
した効果が得られなかった。
The surface roughness of the roll is the average surface roughness Ra of 2.
In the comparative example in which the thickness is 5 μm or less, the thickness of the thin metal plate is not uniform and the surface is dented. Further, in the comparative example in which Ra was 20 μm, the roughness of the surface of the metal thin plate was increased due to the uneven transfer of the rough surface of the roll, and minute cracks starting from the recessed portion of the surface were generated and the surface quality was deteriorated. Furthermore, in the comparative examples in which the thickness of the hard plating layer is outside the range of the present invention, surface scratches, seizures, softening, cracks and the like occur during operation, the roll surface deteriorates, and stable effects were not obtained. .

【0065】(試験2)図2に示す双ロール横注ぎ式連
鋳機を用いて、厚さ1.7mm×幅250mmのステンレス
鋼SUS304の金属薄板を鋳造速度50 m/min で製
造した。冷却ロールは、厚さ2mmのNiめっきを施した
銅合金製スリーブを母材とし、ショットブラストにより
粗面加工した後、厚さ30μm のNi−W、厚さ10μm のCr
の硬質めっきを施工した。ロール表面の最終仕上表面粗
さは平均表面粗さRa で3μm 、5μm 、8μm の3種
類とした。
(Test 2) Using the twin roll lateral pouring type continuous casting machine shown in FIG. 2, a thin metal plate of stainless steel SUS304 having a thickness of 1.7 mm and a width of 250 mm was produced at a casting speed of 50 m / min. The cooling roll is made of Ni-plated copper alloy sleeve with a thickness of 2 mm as the base material, roughened by shot blasting, then Ni-W with a thickness of 30 μm and Cr with a thickness of 10 μm.
Hard plating was applied. The final finished surface roughness of the roll surface was three kinds of average surface roughness Ra of 3 μm, 5 μm and 8 μm.

【0066】上ロールの直径は500mm、胴長は250
mm、下ロールの直径は600mm、胴長は400mm、スリ
ーブ厚さはいずれも15mmである。上下ロール冷却は、
スリーブ内面側に設けた冷却溝に流速5 m/s で水を流
して行った。
The upper roll has a diameter of 500 mm and a body length of 250
mm, the diameter of the lower roll is 600 mm, the body length is 400 mm, and the sleeve thickness is 15 mm. Upper and lower roll cooling
Water was applied at a flow rate of 5 m / s to the cooling groove provided on the inner surface of the sleeve.

【0067】上記3種類の平均表面粗さを有するロール
を用いて得られた金属薄板はいずれも健全であり、凹
み、微小割れは皆無であった。また、ロール周表面の損
傷や金属薄板の焼き付きもなく、安定した鋳造が可能で
あった。
All the metal thin plates obtained by using the rolls having the above-mentioned three types of average surface roughness were sound and had no dents or microcracks. Also, stable casting was possible without damage to the peripheral surface of the roll or seizure of the thin metal plate.

【0068】(試験3)図3に示す双ロール上注ぎ式連
鋳機を用いて、厚さ1.8mm×幅400mmのステンレス
鋼SUS304の金属薄板を鋳造速度50 m/min で製
造した。冷却ロールは、厚さ2mmのNiめっきを施した
銅合金製スリーブを母材とし、ショットブラストにより
粗面加工後、厚さ30μm のNi W、厚さ10μm のCrの硬
質めっきを施工し、最終仕上表面粗さを平均表面粗さR
aで6μm とした。双ロールの直径は600mm、胴長は
400mm、スリーブ厚さはいずれも15mmである。双ロ
ールの冷却はスリーブ内面側に設けた冷却溝に流速5 m
/s で水を流して行った。
(Test 3) Using a twin roll top pouring type continuous casting machine shown in FIG. 3, a thin metal plate of stainless steel SUS304 having a thickness of 1.8 mm and a width of 400 mm was manufactured at a casting speed of 50 m / min. For the cooling roll, a copper alloy sleeve with a thickness of 2 mm Ni is used as the base material, and after roughening the surface by shot blasting, hard plating of Ni W with a thickness of 30 μm and Cr with a thickness of 10 μm is applied. Finished surface roughness is the average surface roughness R
It was 6 μm for a. The twin rolls have a diameter of 600 mm, a body length of 400 mm, and a sleeve thickness of 15 mm. The twin rolls are cooled with a flow velocity of 5 m in the cooling groove provided on the inner surface of the sleeve.
Water was run at / s.

【0069】鋳造された金属薄板は健全であり、凹み、
微小割れは皆無であった。また、ロール表面の損傷や金
属薄板の焼き付きもなく、安定した鋳造が可能であっ
た。
The cast metal sheet is sound, dented,
There were no microcracks. In addition, stable casting was possible without damage to the roll surface or seizure of the thin metal plate.

【0070】[0070]

【発明の効果】本発明ロールによれば、ロール表面の緩
冷却と凹凸転写による熱変形抑制との相乗効果により、
凝固不均一による金属薄板のうねりや凝固シェルの熱変
形による金属薄板表面の微小凹みの発生を防止し、表面
性状の良好な金属薄板の安定した連続鋳造が可能であ
る。また、表層部の硬質めっきにより、操業中のロール
表面の軟化、亀裂、焼き付き等の劣化を防止すること
で、上記効果を維持することができる。
According to the roll of the present invention, due to the synergistic effect of gentle cooling of the roll surface and suppression of thermal deformation by the transfer of unevenness,
It is possible to prevent waviness of a thin metal plate due to uneven solidification and generation of minute dents on the surface of the thin metal plate due to thermal deformation of the solidified shell, and to perform stable continuous casting of a thin metal plate having a good surface property. In addition, the above effect can be maintained by preventing the softening, cracking, and seizure of the roll surface during the operation by the hard plating of the surface layer portion.

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

【図1】本発明ロールを適用することができる単ロール
式連鋳機を示す側面方向の縦断面図である。
FIG. 1 is a vertical cross-sectional view in a side direction showing a single roll type continuous casting machine to which a roll of the present invention can be applied.

【図2】本発明ロールを適用することができる双ロール
横注ぎ式連鋳機を示す側面方向の縦断面図である。
FIG. 2 is a vertical cross-sectional view in a side direction showing a twin roll horizontal pouring type continuous casting machine to which the roll of the present invention can be applied.

【図3】本発明ロールを適用することができる双ロール
上注ぎ式連鋳機を示す側面方向の縦断面図である。
FIG. 3 is a vertical cross-sectional view in a side direction showing a twin roll top pouring type continuous caster to which the roll of the present invention can be applied.

【図4】ロール表面の平均表面粗さと金属薄板の平均表
面粗さの関係を示す図である。
FIG. 4 is a diagram showing the relationship between the average surface roughness of the roll surface and the average surface roughness of the metal thin plate.

【図5】平均表面粗さRa が5μm のロール表面の粗さ
の例を示す図である。
FIG. 5 is a diagram showing an example of roughness of a roll surface having an average surface roughness Ra of 5 μm.

【図6】ロール表面の硬質めっき層を示すロール表層部
の縦断面図である。
FIG. 6 is a vertical cross-sectional view of a roll surface layer portion showing a hard plating layer on the roll surface.

【符号の説明】[Explanation of symbols]

1:表層めっき層、 2:下層めっき層、
3:母材ロール、4,8,9,10:冷却ロール、5:タ
ンディッシュ、6:溶鋼、7:金属薄板
1: surface plating layer, 2: lower plating layer,
3: base material roll, 4, 8, 9, 10: cooling roll, 5: tundish, 6: molten steel, 7: thin metal plate

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】溶融金属をロール周表面で凝固させて金属
薄板を連続鋳造する際に用いる冷却ロールであって、ロ
ール表面の平均表面粗さRa が3〜15μm であること
を特徴とする金属薄板の連続鋳造用ロール。
1. A cooling roll used for continuously casting a thin metal plate by solidifying a molten metal on a peripheral surface of a roll, wherein the roll surface has an average surface roughness Ra of 3 to 15 μm. Roll for thin sheet continuous casting.
【請求項2】溶融金属をロール周表面で凝固させて金属
薄板を連続鋳造する際に用いる冷却ロールであって、ロ
ール表面は下層めっき層と表層めっき層との二層構造を
有し、下層めっき層は厚さ10〜50μm のNi系合
金、表層めっき層は厚さ5〜30μm のCrからなり、
表層めっき層表面の平均表面粗さRa が3〜15μm で
あることを特徴とする金属薄板の連続鋳造用ロール。
2. A cooling roll used when solidifying a molten metal on a peripheral surface of a roll to continuously cast a thin metal plate, the roll surface having a two-layer structure of a lower plating layer and a surface plating layer, and a lower layer. The plating layer is made of a Ni-based alloy having a thickness of 10 to 50 μm, and the surface plating layer is made of Cr having a thickness of 5 to 30 μm.
A roll for continuous casting of a thin metal plate, characterized in that the average surface roughness Ra of the surface of the surface plating layer is 3 to 15 µm.
JP29311194A 1994-11-28 1994-11-28 Roll for continuously casting metallic strip Pending JPH08150442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29311194A JPH08150442A (en) 1994-11-28 1994-11-28 Roll for continuously casting metallic strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29311194A JPH08150442A (en) 1994-11-28 1994-11-28 Roll for continuously casting metallic strip

Publications (1)

Publication Number Publication Date
JPH08150442A true JPH08150442A (en) 1996-06-11

Family

ID=17790574

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29311194A Pending JPH08150442A (en) 1994-11-28 1994-11-28 Roll for continuously casting metallic strip

Country Status (1)

Country Link
JP (1) JPH08150442A (en)

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US6679313B2 (en) * 1999-03-26 2004-01-20 Sollac Process for manufacturing carbon-steel strip by twin-roll continuous casting, product produced and apparatus
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US7442262B2 (en) 2001-12-18 2008-10-28 Showa Denko K.K. Alloy flake for rare earth magnet, production method thereof, alloy powder for rare earth sintered magnet, rare earth sintered magnet, alloy powder for bonded magnet and bonded magnet
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US6679313B2 (en) * 1999-03-26 2004-01-20 Sollac Process for manufacturing carbon-steel strip by twin-roll continuous casting, product produced and apparatus
WO2000064613A1 (en) * 1999-04-22 2000-11-02 Usinor Method for continuously casting ferritic stainless steel strips free of microcracks
US6622779B1 (en) 1999-04-22 2003-09-23 Usinor Method for continuously casting ferritic stainless steel strips free of microcracks
FR2792561A1 (en) * 1999-04-22 2000-10-27 Usinor Continuous casting of crack-free stainless ferritic steel strips between rolls involves using inert gas soluble in steel around meniscus of molten metal present between cylinders
EP1602424B2 (en) 2000-05-12 2013-03-27 Nippon Steel & Sumitomo Metal Corporation A cooling drum for thin slab continuous casting and continuous casting method thereof
US7442262B2 (en) 2001-12-18 2008-10-28 Showa Denko K.K. Alloy flake for rare earth magnet, production method thereof, alloy powder for rare earth sintered magnet, rare earth sintered magnet, alloy powder for bonded magnet and bonded magnet
US7571757B2 (en) 2001-12-18 2009-08-11 Showa Denko K.K. Alloy flake for rare earth magnet, production method thereof, alloy powder for rare earth sintered magnet, rare earth sintered magnet, alloy powder for bonded magnet and bonded magnet
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