JPH09192805A - Method for continuously casting molten steel - Google Patents
Method for continuously casting molten steelInfo
- Publication number
- JPH09192805A JPH09192805A JP316396A JP316396A JPH09192805A JP H09192805 A JPH09192805 A JP H09192805A JP 316396 A JP316396 A JP 316396A JP 316396 A JP316396 A JP 316396A JP H09192805 A JPH09192805 A JP H09192805A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- preventing
- molten steel
- slab
- casting
- 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.)
- Withdrawn
Links
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明方法は、溶鋼の連続鋳
造方法に関するものである。TECHNICAL FIELD The present invention relates to a continuous casting method for molten steel.
【０００２】[0002]
【従来の技術】溶鋼の連続鋳造においては、主として鋳
片縦割れの発生、鋳片内部欠陥の発生、ブレークアウト
発生を防止しつつ操業するものである。例えばカーボン
ブラックで被覆したＣａＣＯ3 を含むパウダーを用い
て、鋳片縦割れを防止することが特開平３−２７８５０
号公報に開示せれている。また、Ａｌ−Ｃａ−Ｍｇ合金
等の発熱材を含有せしめたパウダーを用いて鋳型内での
鋳片幅方向の冷却を均等にして、鋳片縦割れを防止する
ことが特開平３−２１０９５０号公報に開示されてい
る。2. Description of the Related Art In continuous casting of molten steel, operation is carried out mainly while preventing vertical cracks in the slab, internal defects in the slab, and breakout. For example, it is possible to prevent vertical cracking of a slab by using a powder containing CaCO 3 coated with carbon black.
It is disclosed in the official gazette. Further, it is possible to prevent the vertical crack of the slab by uniformly cooling the slab in the width direction of the slab by using a powder containing a heat generating material such as an Al-Ca-Mg alloy. It is disclosed in the official gazette.
【０００３】[0003]
【発明が解決しようとする課題】上記のごとき鋳片の縦
割れの他、鋳造時には、鋳片内部欠陥が発生する。その
防止方法としては、鋳型内注入溶鋼の流速制御（注入溶
鋼量の制御）を施すことによりパウダーの巻き込みを防
止して鋳片内部欠陥を防ぐことが知られている。また、
鋳型内の冷却水供給量の制御と鋳造速度の制御により、
ブレークアウトを防止しつつ操業することが知られてい
る。このような制御は、生産性を低下させることにな
り、しかも操業条件を制御するため、操業が複雑になり
作業性も低下する等の課題がある。本発明方法は、この
ような課題を有利に解決するためなされたものであり、
上記のごとき課題をパウダーの使い分けによって確実に
解決することを提供することを目的とするものである。In addition to the vertical cracking of the slab as described above, internal defects of the slab occur during casting. As a method for preventing this, it is known that the flow rate control of the injected molten steel in the mold (control of the amount of injected molten steel) is performed to prevent the entrainment of powder and prevent internal defects of the cast slab. Also,
By controlling the cooling water supply amount in the mold and the casting speed,
It is known to operate while preventing breakouts. Such control results in a decrease in productivity, and further, because the operating conditions are controlled, there are problems such as complicated operation and reduced workability. The method of the present invention has been made in order to advantageously solve such a problem,
The purpose of the present invention is to provide a solution to the above problems by using different powders.
【０００４】[0004]
【課題を解決するための手段】本発明方法の特徴とする
ところは、溶鋼の連続鋳造に際し、鋳片縦割れ防止用、
鋳片内部欠陥防止用、ブレークアウト防止用の１または
２以上の特性を有するパウダーに造り分け、鋳造時に選
択使用することを特徴とする溶鋼の連続鋳造方法であ
る。A feature of the method of the present invention is that it prevents slab vertical cracking during continuous casting of molten steel.
It is a continuous casting method for molten steel, characterized in that a powder having at least one or two or more properties for preventing internal defects of a cast slab and for preventing breakout is separately produced and selectively used during casting.
【０００５】[0005]
【発明の実施の形態】本発明方法においては、鋳造時に
発生する鋳片縦割れ、鋳片内部欠陥、ブレークアウトを
確実に防止することのできる用途に適合するパウダー特
性に造り分け、鋳造時に選択使用することによって、上
記欠陥等を防止しつつ連続鋳造するものである。しかし
て、鋳片の縦割れは、鋳型での鋳片の抜熱量が影響する
ことから、例えば鋼種の変更等によって鋳造速度が変更
され、また鋳造鋼種変更したものによって、抜熱量が変
化するとき、鋳型内壁と溶鋼（鋳片）間へ流入するパウ
ダーによって、鋳片の縦割れが発生しないような抜熱量
に制御し得る特性を有するパウダーを用いる。また、鋳
片内部欠陥は、鋳型内の注入溶鋼の流動によって鋳型内
溶鋼表面に添加したパウダーを巻き込み、鋳片表層内部
に介在して内部欠陥になることから、例えば鋼種の変更
等によって鋳造速度が変更されるのにともない鋳型内へ
注入する溶鋼量も変更することから、鋳型内での溶鋼流
動が変化して、鋳型内溶鋼表面に添加したパウダーの粘
度によって溶鋼中へ巻き込まれる度合いが異なる。従っ
て、パウダーを巻き込むおそれのあるときに、巻き込ま
れ難い粘度特性を有するパウダーを使用する。更に、ブ
レークアウトが発生し易いときは、一般にパウダーが鋳
型内壁と溶鋼間に十分流れ込まず、パウダー消費量が減
少し潤滑機能が低下して溶鋼（鋳片）が鋳型内壁に焼き
付いてブレークアウトが発生することになる。従って、
パウダーが鋳型内壁と溶鋼間十分に流れ込む特性を有す
るパウダーに切替え使用するものである。BEST MODE FOR CARRYING OUT THE INVENTION According to the method of the present invention, the powder characteristics are selected according to the use so that vertical cracks of cast slabs, internal defects of cast slabs, and breakouts that occur during casting can be reliably prevented. By using it, continuous casting is performed while preventing the above defects and the like. However, vertical cracking of the slab is affected by the heat removal amount of the slab in the mold, for example, the casting speed is changed by changing the steel type, and the heat removal amount changes when the casting steel type is changed. A powder having a characteristic capable of controlling the amount of heat removal so that vertical cracking of the slab does not occur due to the powder flowing between the inner wall of the mold and the molten steel (slab) is used. Further, the internal defects of the slab include the powder added to the surface of the molten steel in the mold due to the flow of the molten steel injected into the mold, and become the internal defects by intervening inside the surface layer of the slab. As the amount of molten steel injected into the mold changes as the temperature changes, the flow of molten steel in the mold changes and the degree of inclusion in molten steel changes depending on the viscosity of the powder added to the surface of the molten steel in the mold. . Therefore, when there is a possibility that the powder may be caught, a powder having a viscosity characteristic that is hard to be caught is used. Furthermore, when breakout is likely to occur, the powder generally does not flow sufficiently between the inner wall of the mold and the molten steel, the powder consumption decreases, the lubrication function deteriorates, and the molten steel (slab) seizes on the inner wall of the mold, causing breakout. Will occur. Therefore,
The powder is used by switching to a powder having a characteristic that the powder flows sufficiently between the inner wall of the mold and the molten steel.
【０００６】上記のごとき、用途特性に応じたパウダー
特性としては、鋳造鋼種等によって若干異なるが、例え
ばＣ：０．０８〜０．２０％、Ｍｎ：０．１〜０．５
％、Ｓｉ：０．０４％以下、Ｐ：０．０５％以下、Ｓ：
０．０５％以下、Ａｌ：０．００５〜０．０８％、残り
Ｆｅ及びその他不純物からなる中炭素鋼を鋳造する場合
は、鋳片縦割れを防止するための鋳型抜熱量として、Ｑ
／Ｖｃ≦０．９５×１０ 6 （Ｑ：鋳型内抜熱量Kcal/m2
・hr、Ｖｃ：鋳造速度m/min ）に制御することにより、
確実に縦割れを防止することができ、このような鋳型抜
熱範囲内に制御するためには、パウダー塩基度（ＣａＯ
／ＳｉＯ2 ）０．８〜１．５に調整するとともに、パウ
ダー凝固温度１１００〜１２５０℃にすることによっ
て、確実に鋳片縦割れを防止する抜熱量に制御すること
ができる。また、鋳型内の溶鋼流動変化による溶鋼中へ
巻き込まれ難いパウダー粘度としては、３．５〜４．５
ポイズ（ａｔ１３００℃）に調整したパウダーを使用す
ることにより、確実にパウダー巻き込みによる鋳片の内
部欠陥を防止することができる。更に、上記のごときパ
ウダーの形状を中空形状とすることにより、鋳型と溶鋼
間に流入させ易くなり、顆粒パウダーでは流入が減少し
てブレークアウトが発生するおそれのある場合、中空形
状のパウダーに切替えて使用することにより、確実にブ
レークアウトを防止することができる。[0006] As described above, the powder according to the application characteristics
The characteristics differ slightly depending on the type of cast steel, but
For example, C: 0.08 to 0.20%, Mn: 0.1 to 0.5
%, Si: 0.04% or less, P: 0.05% or less, S:
0.05% or less, Al: 0.005-0.08%, rest
When casting medium carbon steel consisting of Fe and other impurities
Is the amount of heat removed from the mold to prevent vertical cracking of the slab.
/Vc≦0.95×10 6(Q: Heat removal in the mold Kcal / mTwo
・ Hr, Vc: casting speed m / min)
Vertical cracks can be reliably prevented, and such mold removal
To control within the heat range, powder basicity (CaO
/ SiOTwo) Adjust to 0.8-1.5 and pow
By setting the Dar coagulation temperature to 1100 to 1250 ° C
Control the amount of heat removed to prevent vertical cracking of the slab.
Can be. Also, due to the change of molten steel flow in the mold,
As powder viscosity which is hard to be caught, it is 3.5-4.5
Use powder adjusted to poise (at 1300 ℃)
By doing so, it is possible to ensure that the
Part defects can be prevented. In addition, the above
By making the shape of the Uder hollow, the mold and molten steel
It becomes easier to flow in between, and the inflow decreases with granular powder
If there is a risk of breakout,
By switching to powder-like powder and using it,
It is possible to prevent rake out.
【０００７】次に、上記のごとき機能を確実に発揮する
ことのできるパウダー組成の一例を上げると、凝固温度
を１１００〜１２５０℃とするパウダーは、ＣａＯ：３
５〜４５％、ＳｉＯ2 ：３０〜４０％、Ａｌ2 Ｏ3 ：０
〜１０％、Ｎａ2 Ｏ：０〜１０％、Ｆ- ：０〜１５％、
残りその他成分。粘度３．５〜４．５ポイズ（ａｔ１３
００℃）とするパウダーは、ＣａＯ：３０〜４５％、Ｓ
ｉＯ2 ：３０〜４５％、Ａｌ2 Ｏ3 ：０〜１０％、Ｎａ
2 Ｏ：０〜５％、Ｆ- ：０〜７％、残りその他成分。鋳
型内壁と溶鋼間への流入を促進（消費量を促進）するパ
ウダーとしては、上記のごときパウダーを中空率約１０
０％、粒径０．１〜１．０ｍｍの中空形状、また鋳型内
壁と溶鋼間への流入をそれ程促進する必要ないパウダー
としては、粒径０．５〜１．５ｍｍの顆粒パウダーとす
る。Next, as an example of a powder composition capable of reliably exhibiting the above-mentioned functions, powder having a solidification temperature of 1100 to 1250 ° C. is CaO: 3.
5 to 45%, SiO 2 : 30 to 40%, Al 2 O 3 : 0
~10%, Na 2 O: 0~10 %, F -: 0~15%,
The remaining other ingredients. Viscosity 3.5-4.5 Poise (at 13
The powder whose temperature is 00 ° C) is CaO: 30 to 45%, S
iO 2: 30~45%, Al 2 O 3: 0~10%, Na
2 O: 0 to 5%, F − : 0 to 7%, the rest other components. As the powder for promoting the inflow between the inner wall of the mold and the molten steel (promoting the consumption amount), the powder as described above has a hollow ratio of about 10
Granular powder having a particle size of 0.5 to 1.5 mm is used as a powder having a hollow shape of 0% and a particle size of 0.1 to 1.0 mm and which does not need to promote the inflow into the space between the inner wall of the mold and the molten steel.
【０００８】このようなパウダーを溶鋼組成、鋳型速
度、注入溶鋼温度等に応じて、上記のごとき、鋳片縦割
れ防止用、鋳片内部欠陥防止用、ブレークアウト防止用
の内何れか１種または２種の特性を有するパウダーと、
これらの特性を有するパウダーにより、中空形状または
顆粒形状に成形したパウダーに造り分けておき、鋳造時
に鋳片縦割れ、鋳片内部欠陥、ブレークアウトの内何れ
か発生のおそれがある場合に、これに適応する特性を有
するパウダーを選択使用することにより、鋳片の品質を
向上し、しかもブレークアウトを防止する安定した操業
ができるものである。Depending on the composition of molten steel, the mold speed, the temperature of molten steel injected, etc., one of the above powders is used for preventing vertical cracking of the slab, preventing internal defects of the slab, and preventing breakout. Or a powder with two characteristics,
Depending on the powder having these characteristics, the powder is molded into a hollow shape or a granule shape, and if there is a risk of any one of vertical cracks in the slab, internal defects in the slab, and breakout during casting, By selecting and using a powder having a property adapted to, it is possible to improve the quality of the slab and to perform a stable operation that prevents breakout.
【０００９】例えば溶鋼組成、注入溶鋼温度、鋳造速度
をそれぞれ一定にして鋳造する場合は、発生するおそれ
のある難点を防止する、上記のごとき何れか１種類のパ
ウダーを選択使用する。また、溶鋼組成、注入溶鋼温度
が一定で鋳造中に鋳造速度を変更する場合は、鋳造速度
の変更にともない発生するおそれのある難点を防止す
る、パウダーに切替えて使用する。更に、別の鋼種（溶
鋼）に変更して鋳造する場合は、その鋼種、注入溶鋼温
度、鋳造速度により発生するおそれのある難点を防止す
るパウダーに切替えて使用することにより、鋳片の品質
を向上し、かつブレークアウトを防止して安定操業がで
きる。For example, when casting is performed with the molten steel composition, the molten steel temperature to be injected, and the casting speed kept constant, any one of the above-mentioned powders is selected and used to prevent problems that may occur. When the casting speed is changed during casting when the molten steel composition and the temperature of the injected molten steel are constant, the powder is used by switching to a powder that prevents problems that may occur due to the change of the casting speed. Furthermore, when changing to another steel type (molten steel) and casting, the quality of the slab is improved by switching to a powder that prevents problems that may occur due to the steel type, molten steel temperature injected, and casting speed. Improves and prevents breakout, and stable operation is possible.
【００１０】[0010]
【実施例】次に、本発明方法の実施例を比較例とともに
挙げる。 １）溶鋼組成（％）、Ｃ：０．１２、Ｍｎ：０．２１、
Ｓｉ：０．０１、Ｐ：０．０２、Ａｌ：０．０４、残り
Ｆｅ及びその他不純物。 ２）パウダー性状EXAMPLES Next, examples of the method of the present invention will be given together with comparative examples. 1) Molten steel composition (%), C: 0.12, Mn: 0.21,
Si: 0.01, P: 0.02, Al: 0.04, balance Fe and other impurities. 2) Powder properties
【表１】 [Table 1]
【００１１】注１：ＢＯは、ブレークアウト。 注２：顆粒は、平均粒径１．０ｍｍ、中空は、中空率１
００％、平均粒径０．５ｍｍ。 鋳造速度１．３ｍ／分のときは、パウダーＣを０．４Ｋ
ｇ／ｔ−ｓ添加しつつ鋳造した。また、鋳造速度０．８
ｍ／分のときは、パウダーＢを０．４Ｋｇ／ｔ−ｓ添加
しつつ鋳造した。更に、鋳造速度２．０ｍ／分に増速し
たとき、パウダーＣの消費量が０．３Ｋｇ／ｔ−ｓに減
少したため、パウダーＦに切替えて鋳造し、パウダー消
費量を０．４Ｋｇ／ｔ−ｓに増加させ、ブレークアウト
を回避しつつ１０００ｔ鋳造したところ、次記のごとき
優れた結果が得られた。 １）縦割れ鋳片格落率：０％ ２）鋳片内部欠陥格落率：０％（通常工程で０．２ｍｍ
鋼板に加工後のパウダー巻き込みによる表面欠陥格落
率。 ３）ブレークアウト回数：０Note 1: BO is a breakout. Note 2: Granules have an average particle size of 1.0 mm, and hollow particles have a hollow ratio of 1
00%, average particle size 0.5 mm. When casting speed is 1.3m / min, powder C is 0.4K
Casting was performed while adding g / ts. Also, casting speed 0.8
At the time of m / min, the powder B was cast while adding 0.4 Kg / ts. Furthermore, when the casting speed was increased to 2.0 m / min, the consumption of powder C decreased to 0.3 Kg / t-s, so switching to powder F was performed for casting, and the consumption of powder was 0.4 Kg / t-s. When it was cast for 1000 tons while increasing the value to s and avoiding breakout, excellent results as described below were obtained. 1) Vertical slab drop rate: 0% 2) Cast internal defect drop rate: 0% (0.2mm in normal process)
Percentage of surface defects degraded due to the inclusion of powder in the steel sheet after processing. 3) Breakout count: 0
【００１２】比較例 上記実施例と同条件で鋳造し、鋳造速度に関係なく、パ
ウダー組成：ＣａＯ：３０％、ＳｉＯ2 ：４０％、Ａｌ
2 Ｏ3 ：６％、Ｎａ2 Ｏ：０．９％、Ｆ- ：１１％残り
その他組成からなる顆粒パウダー（平均粒径１．０ｍ
ｍ、粘度１．５ポイズ、凝固温度１１６０℃）を０．２
〜０．３Ｋｇ／ｔ−ｓ添加しつつ鋳造したところ、次記
のごとき結果にとどまった。 １）縦割れ鋳片格落率：５．０％ ２）鋳片内部欠陥格落率：１．０％（通常工程で０．２
ｍｍ鋼板に加工後のパウダー巻き込みによる表面欠陥格
落率）。 ３）ブレークアウト回数：１回Comparative Example Casting was carried out under the same conditions as in the above example, regardless of the casting speed, powder composition: CaO: 30%, SiO 2 : 40%, Al
Granular powder consisting of 2 O 3 : 6%, Na 2 O: 0.9%, F − : 11% and other composition (average particle size 1.0 m
m, viscosity 1.5 poise, solidification temperature 1160 ° C) 0.2
When casting was performed while adding ~ 0.3 Kg / ts, the results were as follows. 1) Vertical crack slab rating: 5.0% 2) Cast internal defect rating: 1.0% (0.2 in normal process)
Defect rate of surface defects due to powder entrainment after processing on mm steel plate). 3) Breakout frequency: 1 time
【００１３】[0013]
【発明の効果】本発明方法によれば、連続鋳造において
鋳片の縦割れ発生、パウダー巻き込みによる鋳片の内部
欠陥発生及びブレークアウト発生を確実に防止すること
ができ、鋼製品の品質を向上し、しかも歩留りを高める
ことができる。また、パウダー特性の選択使用により、
鋳造中の欠陥を防止するため操業条件を変更することな
く、従来の高生産性を維持しつつ操業することができる
等の優れた効果が得られる。EFFECTS OF THE INVENTION According to the method of the present invention, it is possible to reliably prevent the occurrence of vertical cracks in a slab, the occurrence of internal defects in the slab due to powder entrainment and the occurrence of breakout in continuous casting, thus improving the quality of steel products. In addition, the yield can be improved. Also, by selecting and using the powder characteristics,
It is possible to obtain an excellent effect that the conventional high productivity can be maintained without changing the operating conditions to prevent defects during casting.
Claims (2)
用、鋳片内部欠陥防止用、ブレークアウト防止用の１ま
たは２以上の特性を有するパウダーに造り分け、鋳造時
に選択使用することを特徴とする溶鋼の連続鋳造方法。1. In continuous casting of molten steel, a powder having one or more properties for preventing vertical cracking of a slab, preventing internal defects of a slab, and preventing breakout is manufactured separately and used selectively during casting. A characteristic method for continuous casting of molten steel.
０〜１２５０℃の鋳片縦割れ防止用顆粒パウダー、粘度
３．５〜４．５ポイズ（ａｔ１３００℃）の鋳片内部欠
陥防止用顆粒パウダー、上記パウダーを中空形状にした
ブレークアウト防止用中空パウダーを１または２以上の
特性を有するパウダーに造り分け、鋳造時に選択使用す
ることを特徴とする請求項１に記載の溶鋼の連続鋳造方
法。2. A basicity of 0.8 to 1.5 and a solidification temperature of 110.
Granule powder for preventing vertical cracking of cast at 0 to 1250 ° C, granule powder for preventing internal defects of cast at viscosity of 3.5 to 4.5 poise (at 1300 ° C), hollow powder for preventing breakout which is a hollow shape of the above powder 2. The continuous casting method for molten steel according to claim 1, wherein the powder is manufactured into powders having one or more characteristics and selectively used during casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP316396A JPH09192805A (en) | 1996-01-11 | 1996-01-11 | Method for continuously casting molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP316396A JPH09192805A (en) | 1996-01-11 | 1996-01-11 | Method for continuously casting molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09192805A true JPH09192805A (en) | 1997-07-29 |
Family
ID=11549697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP316396A Withdrawn JPH09192805A (en) | 1996-01-11 | 1996-01-11 | Method for continuously casting molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09192805A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009279619A (en) * | 2008-05-22 | 2009-12-03 | Sanyo Special Steel Co Ltd | Continuous casting method for steel |
| JP2010240711A (en) * | 2009-04-08 | 2010-10-28 | Sumitomo Metal Ind Ltd | Continuous casting method of medium-carbon steel |
-
1996
- 1996-01-11 JP JP316396A patent/JPH09192805A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009279619A (en) * | 2008-05-22 | 2009-12-03 | Sanyo Special Steel Co Ltd | Continuous casting method for steel |
| JP2010240711A (en) * | 2009-04-08 | 2010-10-28 | Sumitomo Metal Ind Ltd | Continuous casting method of medium-carbon steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4248631A (en) | Casting powder for the continuous casting of steel and method for producing the same | |
| CN104772441A (en) | Continuous casting powder for high-carbon high-alloy steel | |
| CN105819880A (en) | Alumina-carbon-based flow distributing opening and preparing method thereof | |
| JPH10317083A (en) | Grain refiner for aluminum alloy | |
| JPH09192805A (en) | Method for continuously casting molten steel | |
| JP3249429B2 (en) | Mold powder for continuous casting of steel | |
| RU2367538C1 (en) | Coating for casting moulds at centrifugal casting of copper alloys | |
| CN111604483A (en) | Super-high pulling speed sheet billet continuous casting covering slag for medium-carbon low-alloy steel | |
| JP2003053497A (en) | Flux for continuous casting | |
| JP4036033B2 (en) | High speed casting method for medium carbon steel | |
| JP2000051998A (en) | Method for continuously casting lead-containing steel | |
| JP2673077B2 (en) | Mold additive for continuous casting of steel and continuous casting method | |
| JPH09308951A (en) | Mold powder for continuously casting steel | |
| CN111604484B (en) | Super high drawing speed thin slab continuous casting covering slag for low carbon steel | |
| US3239898A (en) | Production of high-quality ingots | |
| CN114045374B (en) | Special covering slag for nodular cast iron and preparation method and application thereof | |
| JP3519992B2 (en) | Continuous casting flux | |
| JP2004034135A (en) | Aluminum alloy with superior formability in semi-molten state and manufacturing method of its cast ingot | |
| JP3658488B2 (en) | Method for producing eutectic graphite cast iron | |
| JP2004122139A (en) | Method for continuously casting extra-low carbon steel and mold powder for continuous casting | |
| JPH11226723A (en) | Hypereutectic al-si base alloy die casting member and production thereof | |
| JP3238073B2 (en) | Front powder for continuous casting of steel | |
| JPH0985402A (en) | Molding powder for continuous casting | |
| JP4609119B2 (en) | Steel continuous casting method | |
| JPH06106321A (en) | Die casting method for solid-liquid coexisting zone of white cast iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030401 |