JPH05277655A - Twin roll continuous casting method and pouring nozzle - Google Patents
Twin roll continuous casting method and pouring nozzleInfo
- Publication number
- JPH05277655A JPH05277655A JP8222192A JP8222192A JPH05277655A JP H05277655 A JPH05277655 A JP H05277655A JP 8222192 A JP8222192 A JP 8222192A JP 8222192 A JP8222192 A JP 8222192A JP H05277655 A JPH05277655 A JP H05277655A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- continuous casting
- roll continuous
- nozzle
- twin
- 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
Landscapes
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、活性金属を多量に含有
する金属溶湯の双ロール連続鋳造方法およびその実施の
ための注湯ノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin roll continuous casting method for molten metal containing a large amount of active metal and a pouring nozzle for carrying out the method.
【０００２】[0002]
【従来の技術】本出願人は、電子部品、特にリードフレ
ーム用材料として、Ｃｒ、Ｔｉ、Ａｌ、Ｚｒ、Ｂ、Ｃ、
Ｓｉ、Ｍｎを１種または２種以上含む銅含有鉄合金の薄
板を、双ロール連続鋳造法により製造する技術を開発
し、特願平第２−２４５０４号として開示した。この方
法は、双ロール連続鋳造により厚さ数ｍｍの薄板鋳片を
鋳造し、これを熱間圧延を経ずに冷間圧延できるため、
銅を含有する鉄合金に特有の熱間脆性の問題を生ずるこ
となく、上記用途に適した冷間圧延製品を得ることがで
きる。2. Description of the Related Art The applicant of the present invention has adopted Cr, Ti, Al, Zr, B, C, as materials for electronic parts, especially lead frames.
A technology for producing a thin plate of a copper-containing iron alloy containing one or more kinds of Si and Mn by a twin roll continuous casting method was developed and disclosed as Japanese Patent Application No. 2-24504. Since this method casts a thin plate slab having a thickness of several mm by twin roll continuous casting, and this can be cold-rolled without hot rolling,
A cold-rolled product suitable for the above application can be obtained without causing the problem of hot brittleness peculiar to an iron alloy containing copper.
【０００３】しかし、上記合金はＴｉ、Ａｌ、Ｚｒ等の
活性金属を多量に含有するするため、通常のアルミナグ
ラファイト質の注湯ノズルを用いて多量（特に１トン以
上）の溶湯を鋳造した場合、主として上記活性金属の酸
化物系介在物（主としてジルコニア、チタニア、アルミ
ナ等）が双ロール間へ溶湯を供給する注湯ノズルを閉塞
し、鋳造が中断してしまう、という問題があった。However, since the above alloy contains a large amount of active metals such as Ti, Al, Zr, etc., when a large amount (particularly 1 ton or more) of molten metal is cast using a normal alumina graphite-based pouring nozzle. However, there is a problem that the oxide-based inclusions of the active metal (mainly zirconia, titania, alumina, etc.) block the pouring nozzle for supplying the molten metal between the twin rolls, and the casting is interrupted.
【０００４】この問題を解消するために、本出願人は特
願平第３−６４６９５号において、鋳造開始直前にノズ
ル内をアルゴンガスで置換することによって溶湯の酸化
を防止し、ノズル閉塞を防止する方法を提案した。しか
しこの方法は、比較的少量の溶湯の鋳造に対しては効果
的であったが、１トン以上の多量の溶湯を単一のノズル
で長時間にわたり鋳造する場合には、ノズル内壁への介
在物の堆積が徐々に進行し、結局ノズル閉塞を十分に防
止することができないという限界があった。In order to solve this problem, the present applicant has proposed in Japanese Patent Application No. 3-64695 that the inside of the nozzle is replaced with argon gas immediately before the start of casting to prevent the molten metal from being oxidized and to prevent the nozzle from clogging. Suggested a way to do. However, this method was effective for casting a relatively small amount of molten metal, but when casting a large amount of molten metal of 1 ton or more with a single nozzle for a long time, the interposition on the inner wall of the nozzle There is a limit that the accumulation of substances gradually progresses and eventually the nozzle clogging cannot be sufficiently prevented.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記従来技
術の限界を解消して、１トンを大幅に越える多量の溶湯
をノズル閉塞を発生させずに安定して鋳造できる、活性
金属を多量に含有する金属溶湯の双ロール連続鋳造方法
およびその実施のために用いる注湯ノズルを提供するこ
とを目的とする。DISCLOSURE OF THE INVENTION The present invention overcomes the above-mentioned limitations of the prior art and enables stable casting of a large amount of molten metal significantly exceeding 1 ton without nozzle clogging, and a large amount of active metal. It is an object of the present invention to provide a twin roll continuous casting method for a molten metal contained in and a pouring nozzle used for carrying out the method.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の双ロール連続鋳造方法は、活性金属を多
量に含有する金属溶湯を双ロール連続鋳造により鋳造す
る方法において、双ロール間の湯溜まりへの注湯を、固
体ライム（ＣａＯ）を含有する内張り層を有する注湯ノ
ズルで行うことを特徴とする。In order to achieve the above object, the twin roll continuous casting method of the present invention is a twin roll continuous casting method in which a molten metal containing a large amount of an active metal is cast by twin roll continuous casting. It is characterized in that the pouring of the molten metal between the pools is performed by a pouring nozzle having a lining layer containing solid lime (CaO).
【０００７】内張り層は、内張り材に固体ライムをコー
ティングして形成してもよく、固体ライムを含有する内
張り材で形成してもよい。また本発明の双ロール連続鋳
造用鋳造ノズルは、活性金属を多量に含有する金属溶湯
を双ロール間の湯溜まりへ注湯するための双ロール連続
鋳造用注湯ノズルにおいて、固体ライム（ＣａＯ）を含
有する内張り層を有することを特徴とする。The lining layer may be formed by coating the lining material with solid lime, or may be formed by the lining material containing solid lime. The twin-roll continuous casting casting nozzle of the present invention is a twin-roll continuous casting pouring nozzle for pouring a molten metal containing a large amount of an active metal into a pool between twin rolls. It is characterized by having a lining layer containing.
【０００８】[0008]
【作用】本発明者は、固体ライムを含有する内張り層を
有する注湯ノズル用いて、活性金属を多量に含有する金
属溶湯の双ロール連続鋳造について種々実験を行った結
果、ノズル内張り層自体による介在物吸収作用によりノ
ズル閉塞を極めて効果的に防止し、安定して鋳造を行え
ることを見出して本発明を完成させた。The present inventor has conducted various experiments on twin roll continuous casting of a molten metal containing a large amount of active metal by using a pouring nozzle having a lining layer containing solid lime. The present invention has been completed by finding that clogging of the nozzle can be extremely effectively prevented by the action of absorbing inclusions and stable casting can be performed.
【０００９】溶湯中の各酸化物系介在物は下記の反応に
より注湯ノズル内張りの固体ライム（ＣａＯ）により固
定されノズル内壁の下地中へ吸収されると考えられる。酸化物系介在物の吸収反応 ＣａＯ＋ＺｒＯ2 →ＣａＯ・ＺｒＯ2 ＣａＯ＋ｎＡｌ2 Ｏ3 →ＣａＯ・（Ａｌ2 Ｏ3 ）n ＣａＯ＋ＴｉＯ2 →ＣａＯ・ＴｉＯ2 これらの反応は速度が速いため高い効率で各酸化物系介
在物を除去することができ、右辺の生成物は下地に浸透
して強固に密着しており剥離しないため、溶湯中に存在
する介在物がノズル内張り層に効果的に吸収され、長時
間・多量の鋳造においてもノズル内壁への介在物堆積を
生ずることがない。It is considered that each oxide-based inclusion in the molten metal is fixed by the solid lime (CaO) lining the pouring nozzle by the following reaction and absorbed into the base of the inner wall of the nozzle. Absorption reaction of oxide inclusions CaO + ZrO 2 → CaO ・ ZrO 2 CaO + nAl 2 O 3 → CaO ・ (Al 2 O 3 ) n CaO + TiO 2 → CaO ・ TiO 2 These reactions have high kinetics and each oxide is highly efficient. It is possible to remove the system inclusions, and the product on the right side permeates the base and firmly adheres to it and does not peel off, so the inclusions present in the melt are effectively absorbed by the nozzle lining layer for a long time. -In large amount casting, no deposition of inclusions on the inner wall of the nozzle occurs.
【００１０】以下に、実施例によって本発明を更に詳細
に説明する。Hereinafter, the present invention will be described in more detail with reference to Examples.
【００１１】[0011]
〔実施例１〕本発明に従って、双ロール連続鋳造により
薄板鋳片（厚さ２ｍｍ）を鋳造した。製造条件および製
造工程は下記の通りであった。製造条件 溶湯組成（ｗｔ％）： Ｆｅ−３０Ｃｕ−６Ｃｒ−０．５Ｚｒ−１Ｔｉ−０．１
Ａｌ 鋳造温度：１５５０℃ 鋳造速度：４０ｍ／分 溶湯重量：１０トン ノズル材質：アルミナグラファイト 内張り層（コーティング）組成： 純度＞９５％のＣａＯ ７５％ＣａＯ−２５％Ａｌ2 Ｏ3 ５０％ＣａＯ−５０％Ａｌ2 Ｏ3 コーティングなし（比較のための従来例）製造工程 大気溶解→真空溶解→合金添加（Ｚｒ、Ｔｉ、Ａｌ）→
出鋼→タンディッシュ→双ロール連続鋳造（Ａｒシー
ル） 真空溶解は、真空誘導炉において０．１Torrに減圧後、
Ａｒで５０Torrまで復圧させて行った。Example 1 A thin plate slab (thickness: 2 mm) was cast by twin roll continuous casting according to the present invention. The manufacturing conditions and manufacturing process were as follows. Manufacturing conditions Molten metal composition (wt%): Fe-30Cu-6Cr-0.5Zr-1Ti-0.1
Al Casting temperature: 1550 ° C. Casting speed: 40 m / min Molten metal weight: 10 tons Nozzle material: Alumina graphite Lining layer (coating) composition: Purity> 95% CaO 75% CaO-25% Al 2 O 3 50% CaO-50 % Al 2 O 3 No coating (conventional example for comparison) Manufacturing process Air melting → Vacuum melting → Alloy addition (Zr, Ti, Al) →
Steel tapping → Tundish → Twin roll continuous casting (Ar seal) Vacuum melting is performed after depressurizing to 0.1 Torr in a vacuum induction furnace.
The pressure was restored to 50 Torr with Ar.
【００１２】本実施例において溶湯組成として銅を３０
ｗｔ％含有する場合を選んだのは、溶湯中に銅が存在す
ると溶湯中の溶存酸素量が多く、共存する活性金属元素
の酸化物系介在物が発生し易いため、本発明の適用が特
に有利だからである。表１に、各ノズルタイプ〜に
ついての鋳造結果をまとめて示す。 表 １ ──────────────────────────────── ノズルタイプ ノズル閉塞の有無 ──────────────────────────────── なし（１０トン完鋳） 〃 〃 （従来法） ０．５トン鋳造時点でノズル閉塞発生（鋳造中断） ──────────────────────────────── 〔実施例２〕実施例１と同様の製造条件および製造工程
で薄板鋳片（厚さ２ｍｍ）を鋳造した。ただし、溶湯組
成（ｗｔ％）は、Ｆｅ−２５Ｃｒ−５Ａｌとした。In this embodiment, copper is used as the molten metal composition of 30
The case of containing wt% was selected because the presence of copper in the molten metal causes a large amount of dissolved oxygen in the molten metal, and oxide-based inclusions of coexisting active metal elements are likely to be generated. Because it is advantageous. Table 1 shows the casting results for each nozzle type. Table 1 ──────────────────────────────── Nozzle type Nozzle clogging ─────────── ────────────────────── None (10 tons completed casting) 〃 〃 (conventional method) 0.5 tons Nozzle blockage at casting (casting interruption) ─ ─────────────────────────────── [Example 2] Thin plate casting under the same manufacturing conditions and manufacturing processes as in Example 1 Pieces (thickness 2 mm) were cast. However, the composition (wt%) of the molten metal was Fe-25Cr-5Al.
【００１３】表２に、各ノズルタイプ〜についての
鋳造結果をまとめて示す。 表 ２ ──────────────────────────────── ノズルタイプ ノズル閉塞の有無 ──────────────────────────────── なし（１０トン完鋳） 〃 〃 （従来法） ０．５トン鋳造時点でノズル閉塞発生（鋳造中断） ────────────────────────────────Table 2 shows the casting results for each nozzle type. Table 2 ──────────────────────────────── Nozzle type Nozzle blockage ─────────── ────────────────────── None (10 tons completed casting) 〃 〃 (conventional method) 0.5 tons Nozzle blockage at casting (casting interruption) ─ ───────────────────────────────
【００１４】[0014]
【発明の効果】以上説明したように、本発明の方法によ
れば、活性金属を多量に含有する金属溶湯の双ロール連
続鋳造する際に、１トンを大幅に越える多量の溶湯をノ
ズル閉塞を発生させずに安定して鋳造できる。溶湯中に
銅存在する場合には、溶湯中の溶存酸素量が多くなり、
それに伴って活性金属元素の酸化物系介在物の量も必然
的に発生し易くなるので、本発明を適用することが特に
有利である。As described above, according to the method of the present invention, when twin-roll continuous casting of a molten metal containing a large amount of active metal is performed, a large amount of molten metal exceeding 1 ton is clogged with a nozzle. It can be stably cast without generating. When copper is present in the molten metal, the amount of dissolved oxygen in the molten metal increases,
Along with that, the amount of oxide-based inclusions of the active metal element is inevitably generated, and it is particularly advantageous to apply the present invention.
Claims (4)
ロール連続鋳造により鋳造する方法において、双ロール
間の湯溜まりへの注湯を、固体ライム（ＣａＯ）を含有
する内張り層を有する注湯ノズルで行うことを特徴とす
る双ロール連続鋳造方法。1. A method for casting a molten metal containing a large amount of an active metal by twin roll continuous casting, in which pouring into a pool between twin rolls is carried out by using a lining layer containing solid lime (CaO). A twin-roll continuous casting method, which is performed by a hot water nozzle.
をコーティングして形成したことを特徴とする請求項１
記載の双ロール連続鋳造方法。2. The lining layer is formed by coating a lining material with solid lime.
Twin roll continuous casting method as described.
内張り材で形成したことを特徴とする請求項１記載の双
ロール連続鋳造方法。3. The twin roll continuous casting method according to claim 1, wherein the lining layer is formed of a lining material containing solid lime.
ロール間の湯溜まりへ注湯するための双ロール連続鋳造
用注湯ノズルにおいて、固体ライム（ＣａＯ）を含有す
る内張り層を有することを特徴とする注湯ノズル。4. A twin-roll continuous casting pouring nozzle for pouring a molten metal containing a large amount of an active metal into a pool between twin rolls, having a lining layer containing solid lime (CaO). A pouring nozzle characterized by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8222192A JPH05277655A (en) | 1992-04-03 | 1992-04-03 | Twin roll continuous casting method and pouring nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8222192A JPH05277655A (en) | 1992-04-03 | 1992-04-03 | Twin roll continuous casting method and pouring nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05277655A true JPH05277655A (en) | 1993-10-26 |
Family
ID=13768360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8222192A Pending JPH05277655A (en) | 1992-04-03 | 1992-04-03 | Twin roll continuous casting method and pouring nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05277655A (en) |
-
1992
- 1992-04-03 JP JP8222192A patent/JPH05277655A/en active Pending
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