JPH0452067A - Production of cast ingot - Google Patents
Production of cast ingotInfo
- Publication number
- JPH0452067A JPH0452067A JP15818090A JP15818090A JPH0452067A JP H0452067 A JPH0452067 A JP H0452067A JP 15818090 A JP15818090 A JP 15818090A JP 15818090 A JP15818090 A JP 15818090A JP H0452067 A JPH0452067 A JP H0452067A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- mold
- molten
- molten slag
- slag
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000004020 conductor Substances 0.000 claims abstract description 13
- 238000007711 solidification Methods 0.000 abstract description 10
- 230000008023 solidification Effects 0.000 abstract description 10
- 238000005204 segregation Methods 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
Landscapes
- 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、鋳塊の製造方法に関し、特に鋳型内に注入し
た溶鋼面上の溶融スラグに電極を浸漬し、この電極と溶
鋼の間に電流を流して前記鋳型内の溶鋼を加熱保温する
鋳塊の製造方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing an ingot, and in particular, an electrode is immersed in molten slag on the surface of molten steel poured into a mold, and an electrode is placed between the electrode and the molten steel. The present invention relates to a method for producing an ingot, in which molten steel in the mold is heated and kept warm by passing an electric current through the mold.
［従来の技術］
鋳塊の製造においては、凝固収縮に伴う鋳塊内の欠陥を
防止するためうこ鋳塊頭部に押湯を付：することが−船
釣に行われ、この押湯の保温法シこは各種の工夫がなさ
れている。[Prior art] In the production of ingots, a riser is attached to the head of the ingot in order to prevent defects in the ingot due to solidification shrinkage. Various methods of keeping warm have been devised.
押湯の保温法の一つとして、押湯部の溶鋼面上に装入さ
れた溶融スラグに電極を浸漬し、この電極と溶鋼の間に
電流を流し、溶融スラグの抵抗発熱を利用して押湯内の
溶鋼を加熱保温する方法があり、エレクトロスラグホッ
トトップ法（以下ＥＳＨＴ法と称する）と呼ばれている
。One way to keep the feeder warm is by immersing an electrode in molten slag charged above the molten steel surface of the feeder, passing a current between the electrode and the molten steel, and utilizing the resistance heat generated by the molten slag. There is a method of heating and keeping the molten steel in a riser warm, and it is called the electroslag hot top method (hereinafter referred to as ESHT method).
このＥＳＨＴ法は汎用されており、適用される装置の概
要は第４図に示す如く、定盤ｌｌ上に鋳型１２が載置さ
れ、その上に液体によって冷却された押湯枠１３が載置
されている。この鋳型１２に注入された溶鋼１４はその
上面に溶融スラグ１５が装入されている。溶融スラグ１
５内には消耗電極Ｉ６が浸漬され、消耗電極１６と定盤
１１は概略的に示す電ｉｉ７に接続されている。（例え
ば特公昭４７−３９８１７号公報特開昭６１−２９１９
１２号公報参照）〔発明が解決しようとする課題〕
ところで、上述したＥＳＨＴ法では、消耗電極１６と定
盤１１間の溶鋼１＝１内を流れる電流によって、溶融ス
ラグ１５が抵抗発熱し溶融スラグ１５が高温になり、そ
の熱がｉ８ ｗ４１４内に伝えろれることになるが、溶
鋼Ｉ４の下方には伝わりにくく、このため鋳型Ｉ２の側
面からの凝固の進行が進みやすく、残溶鍋のプール形状
が細長い円錐形状となりＥＳＨＴ法を使用しない場合の
鋳塊に比較して偏析や収縮孔がそれほど改善されないこ
とがある。This ESHT method is widely used, and the outline of the apparatus to which it is applied is shown in Fig. 4, in which a mold 12 is placed on a surface plate 11, and a feeder frame 13 cooled by liquid is placed on top of the mold 12. has been done. The molten steel 14 poured into the mold 12 has molten slag 15 charged onto its upper surface. Molten slag 1
A consumable electrode I6 is immersed in the consumable electrode 5, and the consumable electrode 16 and the surface plate 11 are connected to a schematically illustrated electric wire ii7. (For example, Japanese Patent Publication No. 47-39817, Japanese Unexamined Patent Publication No. 61-2919)
(See Publication No. 12) [Problems to be Solved by the Invention] By the way, in the above-mentioned ESHT method, the molten slag 15 is heated by resistance due to the current flowing in the molten steel 1=1 between the consumable electrode 16 and the surface plate 11, and the molten slag 15 becomes high temperature, and the heat is transferred into i8 w414, but it is difficult to transfer to the lower part of molten steel I4, so solidification progresses more easily from the side of mold I2, and the shape of the pool of the residual molten ladle increases. The ingot has an elongated conical shape, and segregation and shrinkage pores may not be significantly improved compared to an ingot that does not use the ESHT method.
本発明は、上記の問題点に鑑み、偏析や収縮孔が確実に
改善され品質の安定した鋳塊が得られるＥＳＨＴ法によ
る鋳塊の製造方法を提供することを目的とするものであ
る。In view of the above problems, it is an object of the present invention to provide a method for producing an ingot using the ESHT method, which can reliably improve segregation and shrinkage pores and obtain an ingot of stable quality.
上記の目的を達成するため、本発明に係わる鋳塊の製造
方法は、押湯部を具備する鋳型内に溶鋼を注入すると共
にその溶鋼面上に溶融スラグを装入し、この溶融スラグ
に電極を浸漬し、この電極と溶鋼の間に電流を流して前
記鋳型内の溶鋼を加熱保温する鋳塊の製造方法において
、前記溶鋼への電流の導通を、押湯部の外側の鋳型外壁
に立設した導電体を介して行うものである。In order to achieve the above object, a method for manufacturing an ingot according to the present invention involves injecting molten steel into a mold having a feeder section, charging molten slag onto the surface of the molten steel, and placing electrodes on the molten slag. In the ingot production method, the molten steel in the mold is heated and kept warm by passing an electric current between the electrode and the molten steel, and the conduction of the current to the molten steel is conducted by standing on the outside wall of the mold outside the feeder section. This is done through a conductor provided.
〔作 用）
本発明は、溶鋼への電流の導通を、押湯部の外側の鋳型
外壁に立設した導電体を介して行うものであるから、導
電体を流れる電流と押湯部の溶融スラグおよび溶鋼を流
れる電流による電磁力作用によって溶融スラグおよび溶
鋼が流動し、この流動により溶融スラグ中に発生した抵
抗熱を、溶鋼に効率的に伝える一方、鋳型内の上方の溶
鋼と下方の溶鋼が入れ代わるので鋳型内の下方の溶鋼へ
も効率的に伝えることができ、これにより、鋳型内の溶
鋼が高温に保持され鋳型の側面からの凝固の進行が抑制
され、溶鋼プールが上方に広がった形状になり、偏析や
収縮孔が確実に改善され品質の安定した鋳塊が得られる
。[Function] Since the present invention conducts current to the molten steel through the conductor installed upright on the outer wall of the mold outside the feeder, the current flowing through the conductor and the melting of the feeder The molten slag and molten steel flow due to the electromagnetic force effect caused by the current flowing through the slag and molten steel, and this flow efficiently transfers the resistance heat generated in the molten slag to the molten steel. Since the molten steel is replaced, it can be efficiently transmitted to the molten steel below in the mold, and as a result, the molten steel in the mold is maintained at a high temperature, inhibiting the progress of solidification from the sides of the mold, and the molten steel pool expands upward. shape, segregation and shrinkage pores are reliably improved, and an ingot with stable quality can be obtained.
上記電磁力作用による溶鋼の流動力は、導電体を流れる
電流と押湯部の溶融スラグおよび溶鋼を流れる電流との
距離に反比例するため、導電体をできるだけ押湯部の外
側の鋳型外壁近傍に立設するとよい。The flow force of molten steel due to the electromagnetic force described above is inversely proportional to the distance between the current flowing through the conductor and the current flowing through the molten slag and molten steel in the feeder. It is best to set it upright.
［実 施 例］ 以下、本発明の実施例を図面を参照して説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図は、本発明に係わる鋳塊の製造方法に適用される
装置の断面概要図である。FIG. 1 is a schematic cross-sectional view of an apparatus applied to the ingot manufacturing method according to the present invention.
図において、１は定盤、２は定盤１上に載置された鋳型
、３は鋳型２上に′ｌｉ置された耐火物製の押湯枠、４
は押湯枠３の外側の鋳型２の外壁上に立設された導電体
、５は消耗電極を示し、導電体４と消耗電極５は電源６
に接続されている。In the figure, 1 is a surface plate, 2 is a mold placed on the surface plate 1, 3 is a refractory feeder frame placed on the mold 2, and 4
is a conductor installed upright on the outer wall of the mold 2 outside the feeder frame 3, 5 is a consumable electrode, and the conductor 4 and the consumable electrode 5 are connected to a power source 6.
It is connected to the.
このように構成された装置において、鋳型２内に溶鋼７
を満たし、その上に溶融スラグ８を装入した後、溶融ス
ラグ８内に消耗電極５を設けると共に、消耗電極５と導
電体４に通電する。この通電で、導電体４を流れる電流
と押湯枠３内の溶融スラグ８および溶鋼７を流れる電流
による電磁力作用によって溶融スラグ８および溶鋼７が
流動し、溶融スラグ８中に発生した抵抗熱を受けて高温
になった溶鋼７が鋳型２の下方へ流動して溶鋼が入れ代
わり、鋳型２内の溶！１ｉｉ１７が高温に保持され鋳型
２の側面からの凝固の進行が抑制され、第２図（ａ）に
示す凝固プロフィールの鋳塊が得られる。In the device configured in this way, molten steel 7 is placed in the mold 2.
After charging the molten slag 8 thereon, the consumable electrode 5 is provided in the molten slag 8, and the consumable electrode 5 and the conductor 4 are energized. With this energization, the molten slag 8 and molten steel 7 flow due to the electromagnetic force effect caused by the current flowing through the conductor 4 and the current flowing through the molten slag 8 and molten steel 7 in the feeder frame 3, and resistance heat is generated in the molten slag 8. As a result, the molten steel 7, which has become hot, flows below the mold 2, replacing the molten steel, and the molten steel inside the mold 2! 1ii17 is maintained at a high temperature to suppress the progress of solidification from the sides of the mold 2, and an ingot having the solidification profile shown in FIG. 2(a) is obtained.
尚、第２図（ｂ）に示す凝固プロフィールは、従来の定
盤１より通電した場合のものである。The solidification profile shown in FIG. 2(b) is obtained when electricity is applied from the conventional surface plate 1.
第２図に示す如く、本発明方法の場合は、上方に広がっ
た形状の溶鋼プールが形成されるのに対して、従来法の
場合は、溶融スラグに発生した抵抗発熱が溶鋼の下方に
伝わりにくいため鋳型の側面からの凝固の進行が進み残
溶鋼のプール形状が細長い円錐形状となっている。As shown in Figure 2, in the method of the present invention, a molten steel pool is formed that spreads upward, whereas in the conventional method, the resistance heat generated in the molten slag is transmitted downward to the molten steel. Because of this, solidification progresses from the sides of the mold, and the pool of residual molten steel takes on an elongated conical shape.
上述した本発明方法と従来法とにより炭素鋼からなる約
２トンの鋳塊を製造した。この時の通電条件は４５０Ａ
ｘ３時間、その後２８０Ａｘ２時間で行った。そして得
られた鋳塊の中心軸上の炭素の偏析状況を調査した。調
査結果を第３図に示す。Approximately 2 tons of ingots made of carbon steel were manufactured using the method of the present invention and the conventional method described above. The current condition at this time is 450A
x 3 hours, then 280A x 2 hours. Then, the state of carbon segregation on the central axis of the obtained ingot was investigated. The survey results are shown in Figure 3.
第３図より明らかなように、本発明法は従来法に比較し
て炭素偏析が大きく改善されでいることが分かる。また
鋳塊縦断面を浸透探傷試験法によって調査した。その結
果、本発明方法により製造した鋳塊の中心軸上の収縮孔
は従来法によるものに比べ大幅に改善されていた。As is clear from FIG. 3, it can be seen that the method of the present invention greatly improves carbon segregation compared to the conventional method. In addition, the longitudinal section of the ingot was investigated using penetrant testing. As a result, the shrinkage pores on the central axis of the ingot produced by the method of the present invention were significantly improved compared to those produced by the conventional method.
［発明の効果：
上述したように、本発明に係わる鋳塊の製造方法によれ
ば、偏析や収縮孔が確実に改善され品質の安定した鋳塊
が製造できる。[Effects of the Invention: As described above, according to the ingot production method according to the present invention, segregation and shrinkage pores are reliably improved, and an ingot of stable quality can be produced.
第１図は、本発明に係わる鋳塊の製造方法に適用される
装置の断面概要図、第２図（ａ）は、本発明法により得
られる鋳塊の凝固プロフィールの模式図、第２図（ｂ）
は、従来法により得られる鋳塊の凝固プロフィールの模
式図、第３回は、炭素偏析の状況を示す図、第４図は、
従来装置の断面概要図である。
１ 定盤 ２ 鋳型
３ 押湯枠 ４ 導電体
５ 消耗電極 ６ 電源
７ 溶鋼 ８ 溶融スラグ特許出願人
株式会社神戸製綱所FIG. 1 is a cross-sectional schematic diagram of an apparatus applied to the ingot manufacturing method according to the present invention, FIG. 2(a) is a schematic diagram of the solidification profile of an ingot obtained by the method of the present invention, and FIG. (b)
is a schematic diagram of the solidification profile of an ingot obtained by the conventional method, the third diagram is a diagram showing the state of carbon segregation, and the fourth diagram is:
FIG. 2 is a schematic cross-sectional view of a conventional device. 1 Surface plate 2 Mold 3 Boiler frame 4 Conductor 5 Consumable electrode 6 Power source 7 Molten steel 8 Molten slag patent applicant
Kobe Steel Works Co., Ltd.
Claims (1)
溶鋼面上に溶融スラグを装入し、この溶融スラグに電極
を浸漬し、この電極と溶鋼の間に電流を流して前記鋳型
内の溶鋼を加熱保温する鋳塊の製造方法において、前記
溶鋼への電流の導通を、押湯部の外側の鋳型外壁に立設
した導電体を介して行うことを特徴とする鋳塊の製造方
法。Molten steel is injected into a mold having a feeder section, and molten slag is charged onto the surface of the molten steel. An electrode is immersed in the molten slag, and a current is passed between the electrode and the molten steel to cool the inside of the mold. A method for producing an ingot in which molten steel is heated and kept warm, characterized in that current is conducted to the molten steel via a conductor installed upright on the outer wall of the mold outside the feeder section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15818090A JPH0452067A (en) | 1990-06-15 | 1990-06-15 | Production of cast ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15818090A JPH0452067A (en) | 1990-06-15 | 1990-06-15 | Production of cast ingot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0452067A true JPH0452067A (en) | 1992-02-20 |
Family
ID=15666020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15818090A Pending JPH0452067A (en) | 1990-06-15 | 1990-06-15 | Production of cast ingot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452067A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5678942A (en) * | 1995-02-28 | 1997-10-21 | Mitsubishi Pencil Kabushiki Kaisha | Ball-point pen |
| US5709493A (en) * | 1993-03-18 | 1998-01-20 | Mitsubishi Pencil Kabushiki Kaisha | Ballpoint pen having a backflow preventing mechanism |
| US5711626A (en) * | 1993-12-06 | 1998-01-27 | Mitsubishi Pencil Kabushiki Kaisha | Ball-point pen with back flow stop |
| US5788819A (en) * | 1992-10-27 | 1998-08-04 | Canon Kabushiki Kaisha | Method for driving liquid, and method and apparatus for mixing and agitation employing the method |
| CN112756565A (en) * | 2020-12-22 | 2021-05-07 | 丹阳市曙光镍材有限公司 | Feeding device and feeding method for nickel alloy ingot |
-
1990
- 1990-06-15 JP JP15818090A patent/JPH0452067A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5788819A (en) * | 1992-10-27 | 1998-08-04 | Canon Kabushiki Kaisha | Method for driving liquid, and method and apparatus for mixing and agitation employing the method |
| US5709493A (en) * | 1993-03-18 | 1998-01-20 | Mitsubishi Pencil Kabushiki Kaisha | Ballpoint pen having a backflow preventing mechanism |
| US5711626A (en) * | 1993-12-06 | 1998-01-27 | Mitsubishi Pencil Kabushiki Kaisha | Ball-point pen with back flow stop |
| US5678942A (en) * | 1995-02-28 | 1997-10-21 | Mitsubishi Pencil Kabushiki Kaisha | Ball-point pen |
| CN112756565A (en) * | 2020-12-22 | 2021-05-07 | 丹阳市曙光镍材有限公司 | Feeding device and feeding method for nickel alloy ingot |
| CN112756565B (en) * | 2020-12-22 | 2022-04-15 | 丹阳市曙光镍材有限公司 | Feeding device and feeding method for nickel alloy ingot |
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