JPS63180347A - Water-cooled casting mold for continuous casting - Google Patents
Water-cooled casting mold for continuous castingInfo
- Publication number
- JPS63180347A JPS63180347A JP1463287A JP1463287A JPS63180347A JP S63180347 A JPS63180347 A JP S63180347A JP 1463287 A JP1463287 A JP 1463287A JP 1463287 A JP1463287 A JP 1463287A JP S63180347 A JPS63180347 A JP S63180347A
- Authority
- JP
- Japan
- Prior art keywords
- water
- stainless steel
- cooled
- wall surface
- steel
- 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
Links
- 238000009749 continuous casting Methods 0.000 title claims abstract description 11
- 238000005266 casting Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 17
- 238000009792 diffusion process Methods 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052802 copper Inorganic materials 0.000 abstract description 18
- 239000010949 copper Substances 0.000 abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 10
- 239000010935 stainless steel Substances 0.000 abstract description 10
- 238000005304 joining Methods 0.000 abstract description 5
- 239000000498 cooling water Substances 0.000 abstract description 3
- 230000005499 meniscus Effects 0.000 abstract description 2
- 238000010924 continuous production Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- -1 stainless steel Chemical compound 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0401—Moulds provided with a feed head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、綱の連続鋳造用水冷鋳型に関するものである
。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a water-cooled mold for continuous casting of steel.
（従来の技術）
鋼を連続鋳造するに際して、炭素量が、０．０９〜０．
１６重量％の範囲にある鋼種は、表面割れが発生しやす
く、現在のように無加熱直送圧延（ＨＤ Ｒ）や、ホン
トチャージ圧延を志向する場合、下工程で大きな問題と
なる。特に縦割れは、水冷鋳型内で溶鋼が凝固する段階
で発生し、その意味でも初期凝固制御が重要となる。(Prior art) When continuously casting steel, the carbon content is 0.09 to 0.
Steel types in the range of 16% by weight are prone to surface cracking, which poses a major problem in downstream processes if current heatless direct rolling (HDR) or real charge rolling is aimed at. In particular, vertical cracks occur during the stage when molten steel solidifies in a water-cooled mold, and in this sense, early solidification control is important.
この初期凝固制御の一つとして、水冷鋳型への抜熱量を
低減する方法がある。この方法は凝固シェル均一化のた
めに有効な方法であり、従来多くの緩冷却鋳型が提案さ
れてきた。One way to control this initial solidification is to reduce the amount of heat removed to the water-cooled mold. This method is an effective method for uniformizing the solidified shell, and many slow cooling molds have been proposed in the past.
しかして、このうち最も簡便に冷却を抑制する方法は、
鋳型水冷銅板の溶鋼と接する側に、銅よりも熱伝導率の
低い金属、例えばステンレス鋼を貼付する事である。However, the easiest way to suppress cooling is
This involves attaching a metal with lower thermal conductivity than copper, such as stainless steel, to the side of the mold water-cooled copper plate that will be in contact with molten steel.
ところで鋳型水冷銅板と低熱伝導率金属を接合する最大
の問題点は溶接方法であり、従来は爆着圧接法や電子ビ
ーム溶接法の２つのみが採用されてきた。By the way, the biggest problem in joining the molded water-cooled copper plate and the low thermal conductivity metal is the welding method, and conventionally only two methods have been used: explosion bonding and pressure welding and electron beam welding.
（発明が解決しようとする問題点）
すなわち鋳型水冷銅板は熱伝導率が高いため、従来のア
ーク溶接では熱が拡散して融接に至らないのである。そ
のために電子ビーム法のように熱を小径ビームとして供
給する事が考えられたが、この電子ビーム法でも鋼とス
テンレス鋼が混ざりあうと接合強度が極端に低下する為
、実用的に溶鋼用の鋳型としては耐久性がなく使用に耐
えない。(Problems to be Solved by the Invention) In other words, since the mold water-cooled copper plate has high thermal conductivity, conventional arc welding does not lead to fusion welding due to heat diffusion. For this purpose, it was considered to supply heat in the form of a small diameter beam like the electron beam method, but even with this electron beam method, the bonding strength would be extremely reduced if steel and stainless steel were mixed, so it was not practical to use the method for molten steel. As a mold, it is not durable and cannot be used.
また爆着はすぐれた方法ではあるが、三者の接合界面の
仕上げ精度を極端に良くしなければならない、あるいは
装置も大規模となるため、実際の鋳型としてはあまり使
用されていないのが実情である。In addition, although explosive bonding is an excellent method, it is not often used in actual molds because it requires extremely high finishing accuracy at the bonding interface between the three parts, and the equipment is large-scale. It is.
本発明はかかる問題点を解決でき、銅よりも熱伝導率の
低い鋼を良好に接合できる連続鋳造用水冷鋳型を提供せ
んとするものである。It is an object of the present invention to provide a water-cooled mold for continuous casting that can solve these problems and can satisfactorily join steel, which has a lower thermal conductivity than copper.
（問題点を解決するための手段）
すなわち本発明は、鋼の連続鋳造用水冷鋳型において、
該水冷鋳型の内周壁面における上端から２００１１ｍの
範囲内に超塑性を有する２相ステンレス鋼を拡散接合し
たことを要旨とする連続鋳造用水冷鋳型である。(Means for solving the problems) That is, the present invention provides a water-cooled mold for continuous casting of steel,
This water-cooled mold for continuous casting is characterized in that duplex stainless steel having superplasticity is diffusion bonded within a range of 20,011 m from the upper end of the inner peripheral wall surface of the water-cooled mold.
本発明においては低熱伝導率金属として、２相ステンレ
ス鋼を採用した。その理由はこの２相ステンレス鋼は、
本出願人が特願昭６０−１７９４５９号明細書に明らか
にしているように、特定の変形条件で容易に超塑性を示
すものを選ぶことにより、７５０〜１１００℃の比較的
低温で、０．５〜１０ｋｇｆ／ｍ”の加圧力下で銅板と
拡散接合が可能だからである。In the present invention, duplex stainless steel is employed as the low thermal conductivity metal. The reason is that this duplex stainless steel is
As disclosed by the present applicant in Japanese Patent Application No. 179459/1982, by selecting a material that easily exhibits superplasticity under specific deformation conditions, it is possible to achieve 0.00% at a relatively low temperature of 750 to 1100°C. This is because diffusion bonding to a copper plate is possible under a pressure of 5 to 10 kgf/m''.
すなわち、２相ステンレス鋼と銅を接合するに際し、前
記２相ステンレス鋼として固溶窒素含有量０．０５〜０
．２５重量％のＦｅ、Ｃｒ、Ｎｉを主成分とする鋼を準
備し、該２相ステンレス鋼と銅の接合面粗さをＪＩＳ
８０６０１で規定される１０点平均値で３０μｍ以下に
加工し、次いで７５０〜１１００℃の温度に加熱した状
態下で、０．５〜１０ｋｇｆ／ｍ”の圧縮力を付与しな
がら前記２相ステンレスと銅の接合面を突合わせて拡散
接合せしめた後、少なくとも５００℃まで２℃／ｓｅｃ
以上の冷却速度で冷却すれば互の接合面の密着が容易に
なり得て極めて短い拡散距離でお互いを拡散接合させる
ことができるのである。That is, when joining duplex stainless steel and copper, the solid solution nitrogen content of the duplex stainless steel is 0.05 to 0.
．． Prepare a steel whose main components are 25% by weight of Fe, Cr, and Ni, and measure the joint surface roughness of the duplex stainless steel and copper according to JIS.
80601, and then heated to a temperature of 750 to 1100°C, and with the two-phase stainless steel while applying a compressive force of 0.5 to 10 kgf/m''. After abutting the bonding surfaces of copper and diffusion bonding, heat at 2°C/sec to at least 500°C.
By cooling at the above cooling rate, it becomes easy to bring the bonding surfaces into close contact with each other, and they can be diffusion bonded to each other with an extremely short diffusion distance.
また、本発明において２相ステンレス鋼の接合領域を水
冷鋳型の上端から２００鶴以内に限定したのは、鋳型緩
冷却化が凝固シェル均一化に有効であるのはメニスカス
近傍に限定されるためであり、水冷鋳型下部まで２相ス
テンレス鋼を接合すると逆に冷却が不充分となり凝固シ
ェル厚の生成が遅れ、ブレークアウトを引き起こしやす
いからである。Furthermore, in the present invention, the joining area of the duplex stainless steel is limited to within 200 meters from the top of the water-cooled mold because slow cooling of the mold is effective for uniformizing the solidified shell only in the vicinity of the meniscus. This is because if the duplex stainless steel is joined to the bottom of the water-cooled mold, cooling will be insufficient and the formation of solidified shell thickness will be delayed, which will easily cause breakout.
（作 用）
本発明に係る連続鋳造用水冷鋳型は、鋼の連続鋳造用水
冷鋳型において、該水冷鋳型の内周壁面における上端か
ら２００鶴の範囲内に超塑性を有する２相ステンレス鋼
を拡散接合した構成であるため、２相ステンレス鋼を高
能率に水冷鋳型の内周壁面に強固に接合でき、初期凝固
シェルの生成を緩やかに行える。(Function) The water-cooled mold for continuous casting according to the present invention is a water-cooled mold for continuous casting of steel, in which duplex stainless steel having superplasticity is diffused within a range of 200 mm from the upper end of the inner peripheral wall surface of the water-cooled mold. Because of the bonded configuration, the duplex stainless steel can be strongly bonded to the inner peripheral wall surface of the water-cooled mold with high efficiency, and the initial solidification shell can be generated slowly.
（実 施 例） 以下本発明を図面に示す一実施例に基づいて説明する。(Example) The present invention will be described below based on an embodiment shown in the drawings.
図面において、１は水冷鋳型２に注入された溶鋼であり
、この溶鋼１は水冷鋳型２の内周壁面に当接し抜熱され
て凝固シェル３を生成し、この凝固シェル３の厚さは引
き抜かれるに従い順次厚くなってスラブとなる。In the drawing, molten steel 1 is injected into a water-cooled mold 2, and this molten steel 1 comes into contact with the inner peripheral wall surface of the water-cooled mold 2 and is heat removed to produce a solidified shell 3, and the thickness of this solidified shell 3 is equal to that of the drawing. As the thickness increases, it becomes thicker and becomes a slab.
４は前記水冷鋳型２の内周壁面における上端から２００
ｆｌの範囲内に拡散接合された２相ステンレス鋼板であ
り、溶鋼１の保有する熱は水冷鋳型２の上部ではこの２
相ステンレス鋼板４から水冷鋳型２を構成する鋳型水冷
銅板５を通過して冷却水通路６を流れる冷却水に抜かれ
るのである。4 is 200 meters from the upper end of the inner peripheral wall surface of the water-cooled mold 2.
It is a two-phase stainless steel plate that is diffusion bonded within the range of fl, and the heat held by the molten steel 1 is absorbed by this two-phase stainless steel plate in the upper part of the water-cooled mold 2.
The cooling water passes through the mold water-cooled copper plate 5 constituting the water-cooled mold 2 from the stainless steel plate 4 and flows through the cooling water passage 6.
ところで、前記２相ステンレス鋼板４の厚さは２〜５龍
が最適であり、この範囲であれば、鋳型水冷銅板５のみ
より５０％以下の抜熱量となり、凝固シェル均一化が図
れる。By the way, the optimum thickness of the duplex stainless steel plate 4 is 2 to 5 mm, and within this range, the amount of heat removed is 50% or less than that of the mold water-cooled copper plate 5 alone, and a uniform solidified shell can be achieved.
なお、２相ステンレス鋼は下記第１表に示すようにＣｒ
−Ｎｉを含存させたものであり、すでに超塑性について
は判明しているものである。Note that duplex stainless steel is Cr as shown in Table 1 below.
-Ni is contained, and its superplasticity has already been known.
（単位二重量％）
また、拡散接合の条件については、温度は７５０〜１１
００℃が適正範囲であるが、銅の融点等も考慮すると望
ましくは７５０〜９００’Ｃがよい。加熱手段としては
、例えば高周波加熱が考えられる。接合のための圧縮力
は、０ 、５ ｋｇ ｆ ／ ｍ ”以上が必要であり
、あまり大きすぎると座屈、変形が大きくなるため、１
０ ｋｇｆ／ｗ”以下になるのが望ましい。(Unit double weight%) Also, regarding the conditions for diffusion bonding, the temperature is 750 to 11
The appropriate range is 00°C, but preferably 750 to 900'C, taking into consideration the melting point of copper. As the heating means, for example, high frequency heating can be considered. The compressive force for joining needs to be 0.5 kg f/m or more; if it is too large, buckling and deformation will increase, so
It is desirable that it be less than 0 kgf/w.
下記第２表に示す成分の２相ステンレス鋼板（厚さ４１
１）を鋳型水冷銅板の上端から１５０ｆｌの範囲に亘り
、９００℃、１ｋｇｆ／ｗ”の条件で鋳型水冷銅板に拡
散接合し、本発明に係る緩冷却鋳型を作成した。この鋳
型を実機に適用し、０．１２重量％Ｃ−１，６重量％Ｍ
ｎ鋼を鋳込んだ結果、１０００チヤージを超す耐久性を
示し、かつ縦割れ発生頻度は、従来の水冷銅鋳型に比し
１１５となった。Duplex stainless steel plate (thickness 41
1) was diffusion bonded to the water-cooled copper plate of the mold over a range of 150 fl from the upper end of the water-cooled copper plate under the conditions of 900°C and 1 kgf/w'' to create a slow cooling mold according to the present invention.This mold was applied to the actual machine. and 0.12% by weight C-1,6% by weight M
As a result of casting n steel, it showed durability exceeding 1000 charges, and the frequency of vertical cracking was 115 times higher than that of conventional water-cooled copper molds.
第２表
（発明の効果）
以上説明したように本発明に係る連続鋳造用水冷鋳型は
、鋼の連続鋳造用水冷鋳型において、該水冷鋳型の内周
壁面における上端から２００ｍのｗｌｌ円内超塑性を有
する２相ステンレス鋼を拡散接合した構成であるため、
２相ステンレス鋼を高能率に水冷鋳型の内周壁面に強固
に接合でき、初期凝固シェルの生成を緩やかに行える。Table 2 (Effects of the Invention) As explained above, the water-cooled mold for continuous casting according to the present invention is a water-cooled mold for continuous casting of steel. Because it is composed of diffusion bonded duplex stainless steel with
Duplex stainless steel can be strongly and efficiently bonded to the inner wall surface of a water-cooled mold, and an initial solidified shell can be formed slowly.
従って本発明によれば表面割れの少ない高品質のスラブ
を連続して製造できるという大なる効果を有する。Therefore, the present invention has the great effect of being able to continuously produce high quality slabs with few surface cracks.
図面は本発明の一実施例を示す説明図である。 ２は水冷鋳型、４は２相ステンレス鋼。 The drawings are explanatory diagrams showing one embodiment of the present invention. 2 is a water-cooled mold, 4 is a duplex stainless steel.
Claims (1)
内周壁面における上端から２００ｍｍの範囲内に超塑性
を有する２相ステンレス鋼を拡散接合したことを特徴と
する連続鋳造用水冷鋳型。(1) A water-cooled mold for continuous casting of steel, characterized in that a duplex stainless steel having superplasticity is diffusion bonded within a range of 200 mm from the upper end of the inner peripheral wall surface of the water-cooled mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1463287A JPS63180347A (en) | 1987-01-23 | 1987-01-23 | Water-cooled casting mold for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1463287A JPS63180347A (en) | 1987-01-23 | 1987-01-23 | Water-cooled casting mold for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63180347A true JPS63180347A (en) | 1988-07-25 |
Family
ID=11866569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1463287A Pending JPS63180347A (en) | 1987-01-23 | 1987-01-23 | Water-cooled casting mold for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63180347A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998016336A1 (en) * | 1996-10-15 | 1998-04-23 | Davy Distington Limited | Continuous casting mould |
| KR20020004087A (en) * | 2000-07-01 | 2002-01-16 | 이구택 | Complex material mold for soft cooling meniscus-part |
-
1987
- 1987-01-23 JP JP1463287A patent/JPS63180347A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998016336A1 (en) * | 1996-10-15 | 1998-04-23 | Davy Distington Limited | Continuous casting mould |
| US6176298B1 (en) | 1996-10-15 | 2001-01-23 | Davy Distington Limited | Continuous casting mould |
| KR20020004087A (en) * | 2000-07-01 | 2002-01-16 | 이구택 | Complex material mold for soft cooling meniscus-part |
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