JPH03264143A - Continuous casting method and mold thereof - Google Patents
Continuous casting method and mold thereofInfo
- Publication number
- JPH03264143A JPH03264143A JP5790290A JP5790290A JPH03264143A JP H03264143 A JPH03264143 A JP H03264143A JP 5790290 A JP5790290 A JP 5790290A JP 5790290 A JP5790290 A JP 5790290A JP H03264143 A JPH03264143 A JP H03264143A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cooling water
- continuous casting
- mold material
- solidified
- 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 23
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000000498 cooling water Substances 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000007711 solidification Methods 0.000 claims abstract description 15
- 230000008023 solidification Effects 0.000 claims abstract description 15
- 229910019589 Cr—Fe Inorganic materials 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 239000007790 solid phase Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000005499 meniscus Effects 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910000816 inconels 718 Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は連続鋳造方法及びその鋳型に関し、さらに詳し
くは、表面割れの少ない高品質鋳片を製造する連続鋳造
技術に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous casting method and its mold, and more particularly to a continuous casting technique for producing high quality slabs with few surface cracks.
従来のモールドパウダーを用いた連続鋳造法に使用する
鋳型の説明図を第１Ｏ図に示した。浸漬ノズル７を通し
て鋳型に注入された溶鋼は水冷された鋳型材１を介して
抜熱され、凝固シェル４を形成する６形成した凝固シェ
ル４はサポートロール８により形状を保ちつつビンチロ
ール等の引抜装置により下方向に順次引抜かれる。この
時に鋳型・凝固シェル間の焼き付き防止と潤滑特性の向
上を目的としてモールドパウダー５をメニスカス上に散
布して用いている。モールドパウダー５はこの他に浮上
した非金属介在物の吸収除去と溶鋼の保温及び再酸化防
止等の役目も兼ねている。An explanatory diagram of a mold used in the conventional continuous casting method using mold powder is shown in FIG. 1O. The molten steel injected into the mold through the immersion nozzle 7 is heat removed through the water-cooled mold material 1 to form a solidified shell 4.6 The formed solidified shell 4 is pulled out using a vinyl roll or the like while maintaining its shape with a support roll 8. The device sequentially pulls it out downward. At this time, mold powder 5 is sprinkled on the meniscus for the purpose of preventing seizure between the mold and the solidified shell and improving the lubrication properties. In addition, the mold powder 5 also serves to absorb and remove floating non-metallic inclusions, keep the temperature of the molten steel, and prevent re-oxidation.
このモールドパウダー５は鋳型と＃固シェル４との間に
流入し、鋳型・凝固シェル間のモールドパウダー３を形
成する。モールドパウダー５の凝固温度は一般に１００
０−１１００℃前後であり、一方従来の鋳型材１は熱伝
導率の高い銅合金を用いているために、銅合金の高温耐
力を考慮してその表面温度は４００℃以下となるように
設計されている。このため−度メニスカス上で溶融して
鋳型から凝固シェル間に流入したモールドパウダー３は
鋳型に接する面の温度がモールドパウダーの凝固温度以
下であることから鋳型材側では固化し、この時モールド
パウダーと鋳型間にエアーギャップ層６を形成する。第
１０図では模式的に均一なエアーギャップ層を示してい
るが、実際には同相パウダーと鋳型が接触した部分と離
れた部分が混在しており、その領域が時間的にも空間的
にも変化していると考えられる。なお、２はモールドフ
レームである。This mold powder 5 flows between the mold and the solidified shell 4, forming mold powder 3 between the mold and the solidified shell. The solidification temperature of mold powder 5 is generally 100
On the other hand, since the conventional mold material 1 uses a copper alloy with high thermal conductivity, the surface temperature is designed to be 400°C or less in consideration of the high-temperature yield strength of the copper alloy. has been done. Therefore, the mold powder 3 that melts on the meniscus and flows from the mold to the solidified shell is solidified on the mold material side because the temperature of the surface in contact with the mold is below the solidification temperature of the mold powder, and at this time, the mold powder 3 is solidified on the mold material side. An air gap layer 6 is formed between the mold and the mold. Although Fig. 10 schematically shows a uniform air gap layer, in reality there is a mixture of areas where the in-phase powder and the mold are in contact and areas where they are apart, and these areas vary in time and space. It is thought that this is changing. Note that 2 is a mold frame.
鋳型の抜熱特性を考慮すると、エアーギャップ層６の生
成により抜熱量の低下を生ずる結果となる。このために
初期凝固層の厚みに大きく影響する。Considering the heat removal characteristics of the mold, the formation of the air gap layer 6 results in a decrease in the amount of heat removal. This greatly affects the thickness of the initial solidified layer.
すなわち、エアーギャップ層６が厚いところでは凝固が
遅れ、反対にエアーギャップ層６が薄いところでは凝固
が進み、結果的に凝固シェル４の不均一生成となり、熱
応力も加わって鋳片の表面縦割れやブレークアウトが発
生していた。That is, where the air gap layer 6 is thick, solidification is delayed, whereas where the air gap layer 6 is thin, solidification progresses, resulting in non-uniform formation of the solidified shell 4, and thermal stress is also added to the surface of the slab. Cracks and breakouts were occurring.
［発明が解決しようとする課題］
本発明は上述の問題点を解決し均一なシェル凝固が達成
され、表面割れやブレークアウトがなく安定した鋳造を
可能とする連続鋳造方法及びその鋳型を提供することを
課題とするものである。[Problems to be Solved by the Invention] The present invention solves the above-mentioned problems and provides a continuous casting method and mold thereof that achieve uniform shell solidification and enable stable casting without surface cracks or breakouts. This is the issue.
［課題を解決するための手段］
本発明は、上述の課題を解決するものであり、（１）方
法発明は、連続鋳造方法に適用され、次の方法を採った
。すなわち、
溶湯に面する鋳型表面温度を、使用するモールドパウダ
ーの凝固温度以上でかつ鋳造金属の凝固点未満に維持し
て鋳造することを特徴とする連続鋳造方法である。[Means for Solving the Problems] The present invention solves the above-mentioned problems. (1) The method invention is applied to a continuous casting method and employs the following method. That is, it is a continuous casting method characterized by casting while maintaining the temperature of the surface of the mold facing the molten metal at a temperature higher than the solidification temperature of the mold powder used and lower than the solidification point of the cast metal.
（２）装置発明は、連続鋳造鋳型に適用され、次の技術
手段を採った。すなわち、
■冷却水通路を内在したＮｉ−Ｃｒ−Ｆｅ系合金の鋳型
材と冷却水通路に冷却水を導く冷却水供給路を設けたバ
ックフレームとからなることを特徴とする連続鋳造鋳型
である。(2) The device invention was applied to a continuous casting mold and adopted the following technical means. That is, it is a continuous casting mold characterized by consisting of a Ni-Cr-Fe based alloy mold material that includes a cooling water passage and a back frame provided with a cooling water supply passage that guides cooling water to the cooling water passage. .
鋳型材の冷却水通路から鋳型面までの距離を２〜１５ｍ
ｍとするのが好適である。The distance from the cooling water passage of the mold material to the mold surface is 2 to 15 m.
It is preferable to set it to m.
鋳型材の冷却水通路から鋳型面までの距離を、鋳造方向
に従い変化させるように構成してもよい。The distance from the cooling water passage of the mold material to the mold surface may be configured to vary according to the casting direction.
鋳型材の冷却水通路の穴径を５〜１５ｍｍ、それぞれの
穴ピッチを７〜２．５ ｍ ｍにするのが好適である。It is preferable that the hole diameter of the cooling water passage in the mold material is 5 to 15 mm, and the hole pitch is 7 to 2.5 mm.
■Ｎｉ−Ｃｒ−Ｆｅ系合金の鋳型材と鋳型材の背面に複
数の矩形形状の冷却水通路を設けたバックフレームとか
らなることを特徴とする連続鋳造鋳型である。(2) This is a continuous casting mold characterized by consisting of a Ni-Cr-Fe alloy mold material and a back frame in which a plurality of rectangular cooling water passages are provided on the back surface of the mold material.
Ｎｉ−Ｃｒ−Ｆｅ系合金の鋳型材厚みを２〜１５ｍｍと
することができる。The thickness of the Ni-Cr-Fe based alloy mold material can be 2 to 15 mm.
さらに、Ｎｉ−Ｃｒ−Ｆｅ系合金の鋳型材厚みを鋳造方
向に従い変化させるように構成してもよい。Furthermore, the thickness of the Ni-Cr-Fe based alloy mold material may be changed according to the casting direction.
冷却水通路幅を５〜１５ｍｍとし、そのピッチを７〜２
５ ｍ ｍとすれば更に好適である。The cooling water passage width is 5 to 15 mm, and the pitch is 7 to 2.
5 mm is even more suitable.
さらに、冷却水通路は丸穴以外に第９図に示すようなス
リット方式を■、■の装置に採用してもよい。Furthermore, instead of round holes, a slit system as shown in FIG. 9 may be used for the cooling water passage in the apparatuses (1) and (2).
［作用〕
本発明は上述の鋳型・モールドパウダー間のエアギャッ
プ層の低減を目的として行われたものである。[Function] The present invention was carried out for the purpose of reducing the above-mentioned air gap layer between the mold and the mold powder.
本発明の鋳型の作用を第７図を用いて説明する。本発明
の特徴は鋳型材質を銅合金から熱伝導の低い（約１ ／
２０ ） Ｎ ｉ −Ｃｒ −Ｆ ｅ系合金とし、鋳
型材の表面温度を７００℃以上に保ちつつ、かつ鋳型材
の表面温度以下の凝固点を有するモールドパウダーを使
用することにある。すなわち鋳型材表面温度をモールド
パウダーの凝固温度以上に保ちつつ鋳造を行うため、鋳
型ｌと凝固シェル４間のモールドパウダー３は固相状態
が消失し、液相状態に保たれる。このため第１０図に示
されるようなエアーギャップ層６が従来方法に比較して
著しく減少する。このため不均一凝固の減少を実現する
ことが可能となる。The function of the mold of the present invention will be explained using FIG. 7. The feature of the present invention is that the mold material is made of copper alloy with low thermal conductivity (approximately 1 /
20) The purpose is to use a molding powder made of a Ni-Cr-Fe alloy, which maintains the surface temperature of the mold material at 700° C. or higher, and has a solidification point below the surface temperature of the mold material. That is, since casting is carried out while keeping the surface temperature of the mold material higher than the solidification temperature of the mold powder, the mold powder 3 between the mold 1 and the solidified shell 4 loses its solid state and is maintained in a liquid state. Therefore, the air gap layer 6 as shown in FIG. 10 is significantly reduced compared to the conventional method. This makes it possible to reduce uneven solidification.
なお、冷却水通路の穴径、穴ピッチの数値を限定する理
由は、
■ 穴径が５ｍｍ以下であると、芯がぶれ精度がでない
ので深い穴の加工は不可能である。The reasons for limiting the numerical values of the hole diameter and hole pitch of the cooling water passage are as follows: (1) If the hole diameter is less than 5 mm, it is impossible to machine a deep hole because the center runout accuracy is poor.
また、穴ピッチも７ｍｍ以下では隣接する穴と接する恐
れがある。また、穴径、穴ピッチとも小さくなる捏和工
費が高くなる。Furthermore, if the hole pitch is 7 mm or less, there is a risk that the holes will come into contact with adjacent holes. In addition, the kneading cost increases as both the hole diameter and hole pitch become smaller.
穴径が１５ｍｍ以上では均一な冷却ができない。また、
穴ピッチが２５ｍｍ以上で６均一な冷却ができない。If the hole diameter is 15 mm or more, uniform cooling cannot be achieved. Also,
6 Uniform cooling is not possible when the hole pitch is 25 mm or more.
■ 冷却水通路幅についても上記と同様な理由による。■ The same reason applies to the width of the cooling water passage.
［実施例〕
実施例−１
第１図〜第３図は本発明の鋳型の第１の実施例の説明図
であり、第１図は横断面図、第２図は第１図の○印部の
拡大図、第３図は縦断面図を示している。[Example] Example-1 Figures 1 to 3 are explanatory diagrams of a first example of the mold of the present invention, where Figure 1 is a cross-sectional view and Figure 2 is a cross-sectional view of the mold in Figure 1. FIG. 3 shows a longitudinal sectional view.
なお、図中、１１は長辺側鋳型材、１２は短辺側鋳型材
、１３は長辺側バックフレーム、■４は短辺側バックフ
レーム、１５は冷却水通路、１６は０リング、１７は冷
却水供給路、１７ａは排水路、１７ｂは冷却水ヘッダで
ある。In the figure, 11 is the long side mold material, 12 is the short side mold material, 13 is the long side back frame, 4 is the short side back frame, 15 is the cooling water passage, 16 is the 0 ring, 17 17a is a cooling water supply path, 17a is a drainage path, and 17b is a cooling water header.
鋳型材１にはインコネル７１８を使用した。また第２図
に示すように、冷却水通路１５は孔径 ａ＝１０ｍ
ｍ
孔ピッチ ｂ＝ １５ｍｍ
としたものである。Inconel 718 was used as the mold material 1. Further, as shown in Fig. 2, the cooling water passage 15 has a hole diameter a = 10 m.
m hole pitch b = 15 mm.
さらに、第３図に示すように冷却水通路から鋳型材表面
までの距離は上部で４ｍｍ、下部で１２ｍｍとし、鋳造
方向に従いその距離を大きくしたものである。これにつ
いて詳細に説明する。Furthermore, as shown in FIG. 3, the distance from the cooling water passage to the surface of the mold material was 4 mm at the top and 12 mm at the bottom, and the distance was increased according to the casting direction. This will be explained in detail.
鋳型材表面温度 Ｔｓ（℃）
冷却水通路〜鋳型材表面間の距離（板厚）ｔ （ｍ）
鋳型材熱伝導率 １． （Ｋｃａｌ／ｍ ｈｒ
℃）冷却水〜鋳型間熱伝達係数
ｂｗ（Ｋｃａｌ／＋ｗ２ｈｒ ’Ｃ）
冷却水温度 Ｔｗ（’Ｃ）
熱流束 ｑ （Ｋｃａｌ／ｍ２ｈｒ℃）
とすると、
Ｔ ｓ ＝ （ｔ ／ ｌ ＋１ ／ ｈ ｗ ） ｑ
＋ Ｔ ｗここで、
Ｔｗ＝３０ ℃
ｈ Ｗ ：２０． ０００ Ｋｃａｌ／ｍ２ｈｒ℃
λ ＝ １ ６ Ｋｃａｌ／ｍ ｈｒ ℃として
、ｔによるｑとＴｓとの関係を図示すると第８図となる
。Mold material surface temperature Ts (℃) Distance between cooling water passage and mold surface (plate thickness) t (m) Mold material thermal conductivity 1. (Kcal/m hr
°C) Heat transfer coefficient between cooling water and mold bw (Kcal/+w2hr 'C) Cooling water temperature Tw ('C) Heat flux q (Kcal/m2hr °C)
Then, T s = (t / l +1 / h w ) q
+ T w Here, T w = 30 ° C. h W : 20. 000 Kcal/m2hr℃
When λ = 1 6 Kcal/m hr °C, the relationship between q and Ts according to t is illustrated in Fig. 8.
鋳造速度１．８ｍ／ｍｉｎでメニスカス部における熱流
束は約２４０ Ｘ Ｉ Ｏ’ Ｋｃａｌ／ｍ２ｈｒ”ｃ
であり、４ｍ／ｍｉｎ程度の高速鋳造では４００×１０
’ Ｋｃａｌ／ｍ２ｈｒ℃が予測される。また鋳型出口
部における熱流束は鋳造速度１．０ｍ／ｍｉｎで７０
Ｘ １０ ’ Ｋｃａｌ／ｍ２ｈｒ’ｃ程度である。At a casting speed of 1.8 m/min, the heat flux at the meniscus is approximately 240 X I O'Kcal/m2hr"c
In high-speed casting of about 4m/min, the casting speed is 400×10
' Kcal/m2hr°C is predicted. In addition, the heat flux at the mold outlet is 70 m/min at a casting speed of 1.0 m/min.
It is approximately X 10'Kcal/m2hr'c.
従って、鋳型材の冷却水路からの距離ｔは２〜１５ｍｍ
程度必要となる。Therefore, the distance t from the cooling channel of the mold material is 2 to 15 mm.
degree is required.
一般に熱流束はメニスカス近傍で大きく鋳型の下部で小
さくなっているため、鋳造方向に均一な鋳型材表面温度
を得るためには、ｔをメニスカス部で薄く、鋳型下部で
厚くすればさらに好適である。Generally, the heat flux is large near the meniscus and small at the bottom of the mold, so in order to obtain a uniform surface temperature of the mold material in the casting direction, it is more preferable to make t thinner at the meniscus and thicker at the bottom of the mold. .
この鋳型材を使用した場合の鋳型の温度プロフィールを
伝熱数値解析した結果、鋳型表面温度は冷却水孔の間の
位置で最高８２５℃となっていた。本鋳造条件では鋳型
の抜熱量（鋳型冷却水流量×冷却水温度上昇）は従来の
銅合金の鋳型に比較して約３０％の増加が認められ前述
のようなエアーギャップ層の減少が確認された。また鋳
造中のＦｅＳ添加テストにより幅方向の凝固シェル厚の
不均一度も改善されていることが認められた。As a result of numerical heat transfer analysis of the temperature profile of the mold when this mold material was used, the mold surface temperature reached a maximum of 825° C. at the position between the cooling water holes. Under these casting conditions, the amount of heat removed from the mold (mold cooling water flow rate x cooling water temperature rise) was increased by approximately 30% compared to the conventional copper alloy mold, and the reduction in the air gap layer as described above was confirmed. Ta. Furthermore, it was found that the non-uniformity of the solidified shell thickness in the width direction was also improved by the FeS addition test during casting.
以上の理由から、鋳型抜熱量が均一でありかつ抜熱量の
増大が得られるので鋳造速度の増大時にも鋳型下端での
凝固シェル層が増し、ブレークアウトの危険性が減少す
るものと推定される。For the above reasons, it is presumed that since the amount of heat removed from the mold is uniform and the amount of heat removed is increased, the solidified shell layer at the lower end of the mold increases even when the casting speed increases, reducing the risk of breakout. .
なお鋳型材１にインコネル７１８を使用した場合には、
７００℃における高温強度（０，２％耐力）も９５ｋｇ
／ｍｒｒ？と十分大きいため、鋳造前後の熱変形もなく
、長時間使用が可能であった。In addition, when Inconel 718 is used as the mold material 1,
High temperature strength (0.2% proof stress) at 700℃ is also 95kg
/mrr? Because it was large enough, there was no thermal deformation before or after casting, and it could be used for a long time.
実施例−２
幅１２００ｍｍＸ厚さ２２０ｍｍの中炭素鋼を、
鋳造速度 １．２ｍ／ｍｉｎオシレー
ションサイクル １３０ｃｐｍオシレーションストロ
ーク ６ｍｍで
鋳型材Ｍ１．Ｍ２ （組成は第１表参照）は第２図に示
す型式で、
孔径１０ｍｍ 孔ピッチ１５ｍｍ
の鋳型を使用し、鋳型材Ｍ３ （組成は第１表参照）は
、第９図に示すように冷却水通路１５ａをスリット型式
とした従来鋳型を用いた。Example-2 Medium carbon steel with a width of 1200 mm and a thickness of 220 mm was cast as a mold material M1. with a casting speed of 1.2 m/min, an oscillation cycle of 130 cpm, and an oscillation stroke of 6 mm. M2 (for composition, see Table 1) is of the type shown in Figure 2, using a mold with a hole diameter of 10 mm and a hole pitch of 15 mm, and mold material M3 (for composition, see Table 1) is cooled as shown in Figure 9. A conventional mold with a slit-type water passage 15a was used.
本実施例の鋳型材の成分、熱伝導率、高温０．２％耐力
を第１表に、モールドパウダーの成分、粘度、凝固点を
第２表に示した。また、第３表は実施結果を示したもの
である。The components, thermal conductivity, and high temperature 0.2% yield strength of the mold material of this example are shown in Table 1, and the components, viscosity, and freezing point of the molding powder are shown in Table 2. Furthermore, Table 3 shows the implementation results.
実施例−３
第４図〜第６図は本発明の鋳型の第３の実施例の説明図
であり、第４図は横断面の部分拡大図、第５図は第４図
のＡ−Ａ矢視断面図、第６図は縦断面図を示している。Example-3 Figures 4 to 6 are explanatory diagrams of a third example of the mold of the present invention, with Figure 4 being a partially enlarged cross-sectional view, and Figure 5 taken from A-A in Figure 4. A sectional view taken in the direction of arrows, and FIG. 6 shows a longitudinal sectional view.
鋳型材１８にはインコネル７１８を採用した。Inconel 718 was used as the mold material 18.
なお、図中、１９は本箱、２０は鋳型材取付ボルト、２
０ａはナツト、２１は冷却水通路、２２は冷却水ヘッダ
、２３は冷却水供給路、２４は排水路、２５はＯリング
である。In addition, in the figure, 19 is a bookcase, 20 is a mold material mounting bolt, 2
0a is a nut, 21 is a cooling water passage, 22 is a cooling water header, 23 is a cooling water supply passage, 24 is a drainage passage, and 25 is an O-ring.
鋳型材１８の板厚は５ｍｍであり、鋳型長さは７００
ｍ ｍとしている。背面の水箱１９は鋼鉄製でその冷却
水通路２１は１５ｍｍＸ １０ｍｍの矩形形状でピッチ
は２０ｍｍとした例である。The plate thickness of the mold material 18 is 5 mm, and the mold length is 700 mm.
It is set as mm. In this example, the water box 19 on the back is made of steel, and its cooling water passages 21 are rectangular in shape, measuring 15 mm x 10 mm, and have a pitch of 20 mm.
すなわち、第４図において ｄ、ｅ＝５ｍｍ ｃ＝１５ｍｍ とした。That is, in Figure 4 d, e=5mm c=15mm And so.
鋳型材１８と水箱１９は鋳型材１８に溶接したポルト２
０とナツト２０ａによりしっかりと固定されている。The mold material 18 and the water box 19 are connected to the port 2 welded to the mold material 18.
0 and a nut 20a.
この実施例は鋳型材１８が熱応力により反ろうとする力
を極力小さくするために、板厚を薄くシた点が特徴であ
る。This embodiment is characterized in that the plate thickness is made thin in order to minimize the force that tends to cause the mold material 18 to warp due to thermal stress.
本実施例も前例と同様鋳型表面温度はモールドパウダー
の凝固温度以上に高くすることができ、モールド表面側
の固相状態のモールドパウダーが皆無となり、凝固シェ
ルとモールドの間は液相状態のモールドパウダーが充填
されエアーギャップ層を皆無にすることができた。In this example, as in the previous example, the mold surface temperature can be made higher than the solidification temperature of the mold powder, so that there is no mold powder in the solid phase on the mold surface side, and there is no mold powder in the liquid phase between the solidified shell and the mold. Filled with powder, we were able to completely eliminate the air gap layer.
［発明の効果］
本発明は、均一なシェル凝固が達成され従来に比べ表面
割れの少ない高品質な鋳片をブレークアウトすることな
く安定して鋳造することができるようになった。[Effects of the Invention] According to the present invention, it has become possible to stably cast a high-quality slab with uniform shell solidification and fewer surface cracks than before without breakout.
第１図〜第３図は本発明の鋳型の第１の実施例の説明図
であり、第１図は横断面図、第２図は第１図の部分拡大
図、第３図は縦断面図を示し、第４図〜第６図は本発明
の鋳型の第３の実施例の説明図であり、第４図は横断面
の部分拡大図、第５図は第４図のＡ−Ａ矢視断面図、第
６図は縦断面図を示し、第７図は本発明の作用説明図、
第８図は板厚をパラメータとした場合の熱流束と鋳型材
表面温度との関係グラフ、第９図は本発明に使用してい
る冷却水通路をスリット型式とした従来鋳型、第１Ｏ図
は従来の連続鋳造鋳型の縦断面の説明図である。
■・・−鋳型材 ２−バックフレーム３・−鋳
型−凝固シエル間のモールドパウダー４・・・凝固シェ
ル
５−・メニスカス上の溶融モールドパウダー６−・・エ
アーギャップ層
７−・−浸漬ノズル ８・・・サポートロール１１
−・−長辺側鋳型材 １２・−・短辺側鋳型材１３−長
辺側バックフレーム
１４・・−短辺側バックフレーム
１５．１５ａ・・・冷却水通路（鋳型材内）１６・・・
０リング
１７−・−冷却水供給路（バックフレーム内）１７ａ・
・−排水路（バックフレーム内）７ｂ−・・冷却水へラ
ダ
８・・−鋳型材
０−ボルト
１−−一冷却水通路
３−・−冷却水供給路
５−０リング
ａ、ｂ、ｃ、ｄ、ｅ・−寸法
１９・−木箱
２０ａ・・・ナツト
２２・−・冷却水へラダ
２４−・排水路
出
代
願
理
人
人
川崎製鉄株式会社Figures 1 to 3 are explanatory diagrams of a first embodiment of the mold of the present invention, with Figure 1 being a cross-sectional view, Figure 2 being a partially enlarged view of Figure 1, and Figure 3 being a longitudinal cross-section. 4 to 6 are explanatory diagrams of a third embodiment of the mold of the present invention, FIG. 4 is a partially enlarged cross-sectional view, and FIG. 5 is A-A in FIG. 4. 6 shows a longitudinal sectional view, FIG. 7 is a diagram illustrating the operation of the present invention,
Figure 8 is a graph of the relationship between heat flux and mold material surface temperature when plate thickness is taken as a parameter, Figure 9 is a conventional mold with a slit type cooling water passage used in the present invention, and Figure 1O is It is an explanatory view of a longitudinal section of a conventional continuous casting mold. - Mold material 2 - Back frame 3 - Mold powder between mold and solidified shell 4 - Solidified shell 5 - Molten mold powder on meniscus 6 - Air gap layer 7 - Immersion nozzle 8 ...Support role 11
- - Long side mold material 12 - Short side mold material 13 - Long side back frame 14 - Short side back frame 15.15a... Cooling water passage (inside mold material) 16...・
0 ring 17--Cooling water supply path (inside the back frame) 17a-
- Drainage channel (inside the back frame) 7b - Ladder to cooling water 8 - Mold material 0 - Bolt 1 - Cooling water passage 3 - Cooling water supply passage 5 - 0 rings a, b, c , d, e - Dimensions 19 - Wooden box 20a... Nut 22 - Cooling water ladder 24 - Drainage route application agent Kawasaki Steel Corporation
Claims (1)
を、使用するモールドパウダーの凝固温度以上でかつ鋳
造金属の凝固点未満に維持して鋳造することを特徴とす
る連続鋳造方法。 ２ 連続鋳造鋳型において、冷却水通路を内在したＮｉ
−Ｃｒ−Ｆｅ系合金の鋳型材と該冷却水通路に冷却水を
導く冷却水供給路を設けたバックフレームとからなるこ
とを特徴とする連続鋳造鋳型。 ３ 該鋳型材の冷却水通路から鋳型面までの距離が２〜
１５ｍｍである請求項２記載の連続鋳造鋳型。 ４ 該鋳型材の冷却水通路から鋳型面までの距離を、鋳
造方向に従い変化させたことを特徴とする請求項２又は
３記載の連続鋳造鋳型。 ５ 該鋳型材の冷却水通路の穴径が５〜１５ｍｍであり
、それぞれの穴ピッチが７〜２５ｍｍである請求項２、
３又は４記載の連続鋳造鋳型。 ６ 連続鋳造鋳型において、Ｎｉ−Ｃｒ−Ｆｅ系合金の
鋳型材と該鋳型材の背面に複数の矩形形状の冷却水通路
を設けたバックフレームとからなる連続鋳造鋳型。 ７ 該Ｎｉ−Ｃｒ−Ｆｅ系合金の鋳型材厚みが２〜１５
ｍｍである請求項６記載の連続鋳造鋳型。 ８ 該Ｎｉ−Ｃｒ−Ｆｅ系合金の鋳型材厚みを鋳造方向
に従い変化させたことを特徴とする請求項６又は７記載
の連続鋳造鋳型。 ９ 該冷却水通路幅が５〜１５ｍｍであり、そのピッチ
が７〜２５ｍｍである請求項６、７又は８記載の連続鋳
造鋳型。[Claims] 1. A continuous casting method characterized in that during continuous casting, the temperature of the surface of the mold facing the molten metal is maintained at a temperature higher than the solidification temperature of the mold powder used and lower than the solidification point of the cast metal. . 2 In continuous casting molds, Ni with internal cooling water passages
- A continuous casting mold comprising a mold material of a Cr-Fe alloy and a back frame provided with a cooling water supply path for guiding cooling water to the cooling water passage. 3 The distance from the cooling water passage of the mold material to the mold surface is 2 to
The continuous casting mold according to claim 2, which has a diameter of 15 mm. 4. The continuous casting mold according to claim 2 or 3, wherein the distance from the cooling water passage of the mold material to the mold surface is varied according to the casting direction. 5. Claim 2, wherein the hole diameter of the cooling water passage of the mold material is 5 to 15 mm, and the pitch of each hole is 7 to 25 mm.
Continuous casting mold according to 3 or 4. 6. A continuous casting mold comprising a Ni-Cr-Fe based alloy mold material and a back frame provided with a plurality of rectangular cooling water passages on the back surface of the mold material. 7 The thickness of the mold material of the Ni-Cr-Fe alloy is 2 to 15
The continuous casting mold according to claim 6, which has a diameter of mm. 8. The continuous casting mold according to claim 6 or 7, wherein the thickness of the mold material of the Ni-Cr-Fe alloy is varied according to the casting direction. 9. The continuous casting mold according to claim 6, 7 or 8, wherein the cooling water passage has a width of 5 to 15 mm and a pitch of 7 to 25 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5790290A JPH03264143A (en) | 1990-03-12 | 1990-03-12 | Continuous casting method and mold thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5790290A JPH03264143A (en) | 1990-03-12 | 1990-03-12 | Continuous casting method and mold thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03264143A true JPH03264143A (en) | 1991-11-25 |
Family
ID=13068924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5790290A Pending JPH03264143A (en) | 1990-03-12 | 1990-03-12 | Continuous casting method and mold thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03264143A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585946A1 (en) * | 1992-09-04 | 1994-03-09 | Kawasaki Steel Corporation | Apparatus and method for continuous casting of steel |
| JP2015168000A (en) * | 2014-03-10 | 2015-09-28 | Ｊｆｅスチール株式会社 | Casting mold for continuous casting and continuous casting method of steel |
-
1990
- 1990-03-12 JP JP5790290A patent/JPH03264143A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585946A1 (en) * | 1992-09-04 | 1994-03-09 | Kawasaki Steel Corporation | Apparatus and method for continuous casting of steel |
| JP2015168000A (en) * | 2014-03-10 | 2015-09-28 | Ｊｆｅスチール株式会社 | Casting mold for continuous casting and continuous casting method of steel |
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