JPH0929420A - Production of steel ingot by electroslag remelting method - Google Patents
Production of steel ingot by electroslag remelting methodInfo
- Publication number
- JPH0929420A JPH0929420A JP18428195A JP18428195A JPH0929420A JP H0929420 A JPH0929420 A JP H0929420A JP 18428195 A JP18428195 A JP 18428195A JP 18428195 A JP18428195 A JP 18428195A JP H0929420 A JPH0929420 A JP H0929420A
- Authority
- JP
- Japan
- Prior art keywords
- steel ingot
- gas
- mold
- outer peripheral
- thermal conductivity
- 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- Withdrawn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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 53
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical group [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 abstract description 23
- 239000002184 metal Substances 0.000 abstract description 18
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 238000002844 melting Methods 0.000 abstract description 13
- 230000008018 melting Effects 0.000 abstract description 13
- 239000002893 slag Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005204 segregation Methods 0.000 abstract description 6
- 238000007711 solidification Methods 0.000 abstract description 5
- 230000008023 solidification Effects 0.000 abstract description 5
- 101100165177 Caenorhabditis elegans bath-15 gene Proteins 0.000 abstract description 3
- 239000000498 cooling water Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 208000003351 Melanosis Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005499 meniscus Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910001149 41xx steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エレクトロスラグ
再溶解法による鋼塊の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing a steel ingot by an electroslag remelting method.
【０００２】[0002]
【従来の技術】固定式鋳型によるエレクトロスラグ再溶
解法（以下ＥＳＲ法と言う）は、図４に示すように、目
的とする金属を消耗電極21とし、水冷鋳型22内で溶融ス
ラグ浴23に大電流を流し、その抵抗熱で前記電極21を溶
解して逐次凝固させて鋼塊24をつくる一種の再溶解法で
ある。なお、図において、25は溶融金属浴（以下メタル
プールと言う）、26はスタートプレート、27は水冷定
盤、28は冷却水をそれぞれ示す。2. Description of the Related Art In an electroslag remelting method using a fixed mold (hereinafter referred to as ESR method), as shown in FIG. 4, a target metal is used as a consumable electrode 21, and a molten slag bath 23 is formed in a water-cooled mold 22. This is a kind of remelting method in which a large current is passed and the electrode 21 is melted by its resistance heat and successively solidified to form a steel ingot 24. In the figure, 25 is a molten metal bath (hereinafter referred to as a metal pool), 26 is a start plate, 27 is a water cooling platen, and 28 is cooling water.
【０００３】通常、ＥＳＲ法は、フレッケル等のマクロ
偏析が生じないように、メタルプール25を適正な深さに
維持することが重要で、このため一定の溶解速度を保持
するように入力がコントロールされる。すなわち、電極
先端で抵抗熱で溶かされた溶鋼は、滴となって落下し、
水冷した鋳型22および炉底等により冷却され、入熱と抜
熱とが熱的にバランスしてメタルプール25を形成しなが
ら連続的に溶解と凝固が進行し、鋼塊24が製造される。Generally, in the ESR method, it is important to maintain the metal pool 25 at an appropriate depth so that macrosegregation such as freckle does not occur. Therefore, the input is controlled so as to maintain a constant melting rate. To be done. That is, the molten steel melted by resistance heat at the electrode tip drops as drops,
Cooled by the water-cooled mold 22 and furnace bottom, etc., heat input and heat removal are thermally balanced to form a metal pool 25, and melting and solidification proceed continuously to produce a steel ingot 24.
【０００４】[0004]
【発明が解決しようとする課題】しかし、図５に示すよ
うにメタルプール25は、水冷した鋳型22に直接接触して
冷却されるのではなくスラグ殻29に被覆されており、ま
た固定式鋳型によるＥＳＲ法はメタルプール25のメニス
カス部直下より下部では、凝固収縮により鋳型内壁30と
の間にエアギャップ31が生じることは物理的に避けられ
ず、これが鋼塊24を冷却する際の熱伝達の抵抗体となる
ため冷却効果を大きく損なうことになる。このようなこ
とから従来、偏析を防止するための手段は、低速溶解を
余儀無くされ、スラグ殻29の厚肉化や不均一などが発生
して鋼塊24の鋳肌や凝固組織の粗大化等鋼塊品質の劣化
をもたらすことになる。このように、ＥＳＲ法の基本的
な特徴である方向性凝固に対する鋳型側への抜熱は、鋳
型壁と鋼塊表面間のエアギャップ31により冷却効果が損
なわれ、特に偏析の発生を嫌う冷延用ワークロール材や
超合金のＥＳＲ操業は大きな困難さを伴い、品質を満足
できないことがある。However, as shown in FIG. 5, the metal pool 25 is not directly contacted with the water-cooled mold 22 to be cooled but is covered with the slag shell 29, and the fixed mold is also used. In the ESR method according to the above, it is inevitable that an air gap 31 is formed between the inner wall 30 of the mold and the inner wall 30 of the mold below the meniscus portion of the metal pool 25, which is a heat transfer when the steel ingot 24 is cooled. Since it becomes a resistor of, the cooling effect is greatly impaired. For this reason, conventionally, the means for preventing segregation is forced to slow melting, thickening or unevenness of the slag shell 29 occurs, and the casting surface of the steel ingot 24 and the coarsening of the solidification structure occur. This will cause deterioration of the quality of the steel ingot. As described above, the heat removal to the mold side due to the directional solidification, which is a basic feature of the ESR method, impairs the cooling effect due to the air gap 31 between the mold wall and the steel ingot surface, and particularly the cooling that dislikes the occurrence of segregation. The ESR operation of the work roll material for the rolling and the superalloy is accompanied by great difficulty, and the quality may not be satisfied in some cases.
【０００５】本発明は、上記の問題点に鑑みなされたも
のであって、その目的は、メタルプールや鋼塊の外周面
での冷却効果を高め、溶解速度を低下させることなくマ
クロ偏析を防止すると共に表面品質の良好な鋼塊を得る
ＥＳＲ法による鋼塊の製造方法を提供するものである。The present invention has been made in view of the above problems, and an object thereof is to enhance the cooling effect on the outer peripheral surface of a metal pool or steel ingot and prevent macrosegregation without lowering the melting rate. In addition, the present invention provides a method for producing a steel ingot by the ESR method for obtaining a steel ingot with good surface quality.
【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、本発明に係るＥＳＲ法による鋼塊の製造方法は、
鋼塊外周面と鋳型内壁面間に熱伝導性の良好なガスを鋼
塊下部より供給しながらエレクトロスラグ再溶解を行う
ものである。In order to achieve the above object, the method for producing a steel ingot by the ESR method according to the present invention is
Electroslag remelting is performed while supplying a gas having good thermal conductivity from the lower part of the steel ingot between the outer peripheral surface of the steel ingot and the inner wall surface of the mold.
【０００７】そして、上記のＥＳＲ法による鋼塊の製造
方法においては、熱伝導性の良好なガスがヘリウムガス
であってもよいし、あるいは水素ガスや、水素ガスとヘ
リウムガスとの混合ガスであってもよい。In the method for producing a steel ingot by the ESR method described above, the gas having good thermal conductivity may be helium gas, or hydrogen gas or a mixed gas of hydrogen gas and helium gas. It may be.
【０００８】以下、本発明の構成並びに作用を詳細に説
明する。ＥＳＲ法においては、溶解中の高温の鋼塊は、
大部分鋳型の冷却水により抜熱され凝固が進行する。本
発明では、熱伝達を阻害している鋼塊外周面と鋳型内壁
面間のエアギャップ部（正確にはスラグ殻も存在してい
る）に熱伝導性の良好なガスを鋼塊下部より供給して流
すので、熱伝達が向上でき、冷却水への抜熱量を増加さ
せることができる。またこれによって、メタルプールや
鋼塊の外周面での冷却効果が高まるので、溶解速度を低
下させることなくマクロ偏析が防止できると共に表面品
質の良好な鋼塊を得ることができる。Hereinafter, the configuration and operation of the present invention will be described in detail. In the ESR method, the high temperature steel ingot during melting is
Most of the heat is removed by the cooling water of the mold and solidification proceeds. In the present invention, a gas with good thermal conductivity is supplied from the lower part of the steel ingot to the air gap part (exactly, the slag shell also exists) between the outer peripheral surface of the steel ingot and the inner wall surface of the mold, which inhibits heat transfer. Since it is made to flow in this manner, heat transfer can be improved and the amount of heat removed to the cooling water can be increased. Further, as a result, the cooling effect on the outer peripheral surface of the metal pool or the steel ingot is enhanced, so that macrosegregation can be prevented and the steel ingot with good surface quality can be obtained without lowering the melting rate.
【０００９】次に、熱伝導性の良好なガスの供給につい
て説明する。通常、鋼塊外周面と鋳型内壁面間の間隙
は、鋼塊径や鋼塊高さによって相違するが、例えば 800
mmφ程度のＥＳＲでは、鋼塊は凝固収縮するためメニス
カス部から底部に向かうにしたがって間隙は増大し、最
底部では20mmに達する。また、メタルプールの上部には
溶融スラグ浴が約 300mm高さ存在し、スラグ浴のスラグ
殻は、静圧により鋳型壁と接触している。このようにメ
ニスカスの上部では一見間隙がない状態であるが、鋳型
壁と接触しているスラグ殻は比較的に多孔質であり、鋼
塊下部より供給されたガスは小さな圧力で十分通気でき
る。一方、本発明では熱伝導の良好なガスを間隙に存在
させることによって鋼塊側の熱を冷却水にスムーズに伝
え、冷却水への抜熱を増加させることを狙ったもので、
多量のガスを通気させて冷却する必要はなく、滞留しな
い程度に流れがあれば十分であり経済的でもある。Next, the supply of gas having good thermal conductivity will be described. Normally, the gap between the outer peripheral surface of the steel ingot and the inner wall surface of the mold differs depending on the steel ingot diameter and the steel ingot height.
At an ESR of about mmφ, the steel ingot solidifies and shrinks, so the gap increases from the meniscus toward the bottom, and reaches 20 mm at the bottom. In addition, a molten slag bath is present at a height of about 300 mm above the metal pool, and the slag shell of the slag bath is in contact with the mold wall by static pressure. Although there is no gap at the top of the meniscus, the slag shell in contact with the mold wall is relatively porous, and the gas supplied from the bottom of the steel ingot can be sufficiently vented with a small pressure. On the other hand, in the present invention, the heat of the steel ingot side is smoothly transmitted to the cooling water by allowing the gas having good heat conduction to exist in the gap, and the aim is to increase the heat removal to the cooling water.
It is not necessary to ventilate a large amount of gas for cooling, and it is sufficient and economical as long as there is a flow so as not to stay.
【００１０】また、冷却に使用するガスは、良好な熱伝
導度を有する他、ガスの取扱い上爆発等の危険がなく、
下から上に通気させるため密度が小さいと言った条件を
満たすものであればよく、気体の物性値（熱伝導度、密
度、比熱等）を基に選択すれば、Ｈｅガスが最も好まし
く、また水素ガスあるいは水素ガスとＨｅガスの混合ガ
スが比較的好適に使用できる。The gas used for cooling has good thermal conductivity, and there is no danger of explosion when handling the gas.
It is sufficient if it satisfies the condition that the density is small because it is vented from the bottom to the top, and He gas is the most preferable if selected based on the physical properties of the gas (thermal conductivity, density, specific heat, etc.). Hydrogen gas or a mixed gas of hydrogen gas and He gas can be used relatively favorably.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施例を図面を参
照して説明する。図１は、本発明に係るＥＳＲ法による
鋼塊の製造方法に使用されるＥＳＲ炉の概要図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an ESR furnace used in a method for manufacturing a steel ingot by the ESR method according to the present invention.
【００１２】水冷定盤１は底部内に水冷構造を有する。
水冷定盤１の上には鉄板２（以下ガス流し用スタブと言
う）が置かれ、このガス流し用スタブ２の上に、壁内に
通水路が形成された水冷鋳型３と鋳型径より小さく電極
径より大きく形成されたスタートプレート４とが置か
れ、水冷鋳型３との間にはＨｅガスが漏れ出さないよう
にシール材５が設けられている。水冷鋳型３の上方から
は消耗電極６が装入可能とされ、消耗電極６とスタート
プレート４との間で通電しスタートプレート４の上に鋼
塊７が製造される。The water cooling platen 1 has a water cooling structure in the bottom.
An iron plate 2 (hereinafter referred to as a gas-flowing stub) is placed on the water-cooling surface plate 1, and a water-cooling mold 3 having a water passage in the wall and a mold diameter smaller than the mold diameter are placed on the gas-flowing stub 2. A start plate 4 having a diameter larger than the electrode diameter is placed, and a sealing material 5 is provided between the start plate 4 and the water-cooled mold 3 so that He gas does not leak out. A consumable electrode 6 can be loaded from above the water-cooled mold 3, and a current is passed between the consumable electrode 6 and the start plate 4 to produce a steel ingot 7 on the start plate 4.
【００１３】ガス流し用スタブ２は、図２にその詳細を
示すように、スタートプレート４と水冷鋳型３の間隙の
中間円周上に複数個の小孔８を設け、この小孔８に連通
させて側面よりガス供給孔９を設けた構造とされ、この
ガス供給孔９には、図１に示すようにＨｅガスボンベ10
（市販品： 7m3ボンベ, 150気圧）に接続されたガス供
給管11が接続されている。そして、スタートプレート４
と水冷鋳型３の間隙には溶鋼が流出し、小孔８を詰めな
いように多孔質耐火物やセラミック繊維等が設けられ防
護する構造となっている。なお、ガス供給管11には、減
圧弁12、流量計13及びガス溜め14が配置されている。As shown in detail in FIG. 2, the gas flow stub 2 is provided with a plurality of small holes 8 on the intermediate circumference of the gap between the start plate 4 and the water-cooled mold 3 and communicates with the small holes 8. In this structure, the gas supply hole 9 is provided from the side surface, and the He gas cylinder 10 is provided in the gas supply hole 9 as shown in FIG.
A gas supply pipe 11 connected to (commercial product: 7 m 3 cylinder, 150 atm) is connected. And the start plate 4
Molten steel flows out into the space between the water-cooled mold 3 and the water-cooled mold 3, and a porous refractory material, ceramic fiber, or the like is provided so as to prevent the small holes 8 from being filled up. A pressure reducing valve 12, a flow meter 13 and a gas reservoir 14 are arranged in the gas supply pipe 11.
【００１４】次に、上記構成のＥＳＲ炉を用いた鋼塊の
製造方法を説明する。目的とする金属の消耗電極６を水
冷鋳型３の上方から装入し、水冷鋳型３内で溶融スラグ
浴15に大電流を流し、その抵抗熱で消耗電極６を溶解し
逐次凝固させて鋼塊７を製造する一方、ガス流し用スタ
ブ２の小孔８よりＨｅガスを供給する。これにより、メ
タルプール16と鋼塊７の外周面と水冷鋳型３の内壁面と
の間の間隙17には、熱伝導性の良いＨｅガスが存在する
ことになり、このＨｅガスを介して水冷鋳型３により鋼
塊７の冷却効果が高まり、溶解速度を低下させることな
くマクロ偏析が防止できると共に表面品質の良好な鋼塊
７を得ることができる。Next, a method of manufacturing a steel ingot using the ESR furnace having the above structure will be described. A target metal consumable electrode 6 is charged from above the water-cooled mold 3, and a large current is applied to the molten slag bath 15 in the water-cooled mold 3, and the consumable electrode 6 is melted by its resistance heat and successively solidified to form a steel ingot. 7 is manufactured, He gas is supplied through the small holes 8 of the gas flow stub 2. As a result, He gas having good thermal conductivity exists in the gap 17 between the metal pool 16 and the outer peripheral surface of the steel ingot 7 and the inner wall surface of the water-cooled mold 3, and the He-gas having good thermal conductivity exists through the He gas. The cooling effect of the steel ingot 7 is enhanced by the mold 3, macrosegregation can be prevented without lowering the melting rate, and the steel ingot 7 having good surface quality can be obtained.
【００１５】[0015]
【実施例】実際、内径 690mmの水冷鋳型３を使用し、消
耗電極６として冷延用ワークロール材（ 0.9％Ｃ− 5％
ＣｒＭｏ鋼）を用い、表１に示す条件の基でＥＳＲ溶解
を行った。なお、比較のため従来例を表１に併せて示
す。[Examples] Actually, a water-cooled mold 3 having an inner diameter of 690 mm was used, and a work roll material for cold rolling (0.9% C-5%
CrMo steel) was used to perform ESR melting under the conditions shown in Table 1. For comparison, a conventional example is also shown in Table 1.
【００１６】[0016]
【表１】 [Table 1]
【００１７】上記本実施例の溶解において、鋼塊底部か
ら供給したＨｅガスが溶融スラグ浴15の上面の鋳型内空
間に通気していることを確認するため、鋳型内雰囲気の
ガスをサンプリングし、ガスクロマトグラフィーでＨｅ
含有量を定量分析した。この分析結果を図３に示す。図
３より明らかなように、鋳型内雰囲気は当初Ａｒガス10
0％であるが、Ｈｅガスを流し出して約 2時間後には計
算値と一致するＨｅガス量に達し、通気していることが
確認された。In the melting of the present embodiment, in order to confirm that the He gas supplied from the bottom of the steel ingot was vented to the space inside the mold on the upper surface of the molten slag bath 15, the gas in the mold atmosphere was sampled, He by gas chromatography
The content was analyzed quantitatively. The result of this analysis is shown in FIG. As is clear from FIG. 3, the atmosphere in the mold was initially Ar gas 10.
Although it was 0%, it was confirmed that the amount of He gas reached the calculated value approximately 2 hours after the He gas was flowed out, and the gas was ventilated.
【００１８】また、水冷鋳型の冷却水の入排水温度差を
測定し、その冷却効果を調査した。その調査結果を表１
に併せて示す。この調査において、Ｈｅガス流量を10Ｌ
／分流してガス冷却を実施したＥＳＲでは、Ｈｅガスを
用いない従来例のＥＳＲに比べて入排水温度差が、冷却
水量70m3／ｈ（1167Ｌ／分）で約 0.5℃大きく、抜熱率
では約 7％大きい結果が得られた。また、Ｈｅガス流量
を増減させたが、流量が 5〜20Ｌ／分の範囲では鋳型内
雰囲気のＨｅ濃度が飽和する時間に長短があるが、入排
水温度差は10Ｌ／分の時とほぼ同様であった。Further, the temperature difference between the inlet and outlet of the cooling water of the water-cooled mold was measured to investigate the cooling effect. The survey results are shown in Table 1.
Are also shown. In this survey, He gas flow rate was 10L
In the ESR in which the gas cooling is performed by dividing the flow rate by 1 / minute, the difference in inlet and outlet temperature is about 0.5 ° C larger at a cooling water volume of 70 m 3 / h (1167 L / min), and the heat removal rate is higher than that of the conventional ESR that does not use He gas. The result is about 7% larger. Although the He gas flow rate was increased or decreased, when the flow rate was in the range of 5 to 20 L / min, the He concentration in the atmosphere inside the mold was long and short, but the difference between the inlet and outlet temperatures was about 10 L / min. Met.
【００１９】また、本発明例の鋼塊と従来例の鋼塊のト
ップ部定常域からそれぞれ横断面試片を切断し、マクロ
試験を実施した。その結果を表１に併せて示す。本発明
例の鋼塊のフレッケル（逆Ｖ偏析）は従来例の鋼塊のそ
れと比較して、個数で約30％減少し、また発生位置は約
30％内部に移行するなど、Ｈｅガス冷却の効果が明白に
認められた。従来例で同様の効果を得ようとすれば、実
験により得られたメタルプールの形状（断面逆Ｖ字状の
角度）とフレッケル発生位置及び溶解速度との関係よ
り、溶解速度は約30％以上低速にする必要があり、また
このように、低速にすることで鋳肌の劣化だけでなく、
ロール材では重要な品質ニーズである、耐肌荒れ性の指
標となるデンドライト角度等が悪くなるばかりでなく、
生産性も大きく低下することは避けられないことが判明
した。Further, macroscopic tests were carried out by cutting transverse cross-section specimens from the top steady region of the steel ingot of the present invention and the conventional steel ingot. The results are shown in Table 1. The freckle (inverse V segregation) of the steel ingot of the present invention example is reduced by about 30% in number as compared with that of the steel ingot of the conventional example, and the generation position is about
The effect of cooling with He gas was clearly recognized, such as shifting to 30% inside. In order to obtain the same effect in the conventional example, the melting rate is about 30% or more from the relationship between the shape of the metal pool (the angle of the inverted V-shaped cross section), the freckle generation position and the melting rate obtained by the experiment It is necessary to make the speed low, and in this way, not only the deterioration of the casting surface by the low speed,
Not only does the dendrite angle, which is an index of rough skin resistance, which is an important quality need for roll materials, deteriorate,
It turned out that a significant drop in productivity is inevitable.
【００２０】[0020]
【発明の効果】以上説明したように、本発明に係るエレ
クトロスラグ再溶解法による鋼塊の製造方法によれば、
メタルプールや鋼塊の外周面での冷却効果を高めること
ができ、これによって、溶解速度を低下させることなく
マクロ偏析が防止できると共に表面品質の良好な鋼塊を
得ることができ、特に、ロール材の製造では内部品質は
元より表面品質の良いロール材を得ることができる。As described above, according to the method for producing a steel ingot by the electroslag remelting method according to the present invention,
It is possible to enhance the cooling effect on the outer peripheral surface of the metal pool or the steel ingot, and by this, macro segregation can be prevented without lowering the melting rate and a steel ingot with good surface quality can be obtained. In the production of the material, it is possible to obtain a roll material having better surface quality than the internal quality.
【図１】本発明に係るＥＳＲ法による鋼塊の製造方法に
使用されるＥＳＲ炉の概要図である。FIG. 1 is a schematic diagram of an ESR furnace used in a method for producing a steel ingot by an ESR method according to the present invention.
【図２】本発明に係るガス流し用スタブの説明図であっ
て、ａは正面図、ｂは断面図である。FIG. 2 is an explanatory view of a gas flow stub according to the present invention, in which a is a front view and b is a sectional view.
【図３】本発明に係る鋳型内の、時間経過に伴うＨｅガ
ス濃度のグラフ図である。FIG. 3 is a graph showing He gas concentration in a mold according to the present invention with time.
【図４】従来のＥＳＲ炉の概要図である。FIG. 4 is a schematic diagram of a conventional ESR furnace.
【図５】図４の部分拡大断面図である。FIG. 5 is a partially enlarged sectional view of FIG. 4;
１：水冷定盤 ２：ガス流し用スタブ
３：水冷鋳型 ４：スタートプレート ５：シール材
６：消耗電極 ７：鋼塊 ８：小孔
９：ガス供給孔 10：Ｈｅガスボンベ 11：ガス供給管 1
2：減圧弁 13：流量計 14：ガス溜め 1
5：溶融スラグ浴 16：メタルプール1: Water-cooled surface plate 2: Stub for gas flow
3: Water-cooled mold 4: Start plate 5: Seal material
6: Consumable electrode 7: Steel ingot 8: Small hole
9: Gas supply hole 10: He gas cylinder 11: Gas supply pipe 1
2: Pressure reducing valve 13: Flow meter 14: Gas reservoir 1
5: Molten slag bath 16: Metal pool
Claims (3)
良好なガスを鋼塊下部より供給しながらエレクトロスラ
グ再溶解を行うことを特徴とするエレクトロスラグ再溶
解法による鋼塊の製造方法。1. An electroslag remelting method, characterized in that electroslag remelting is performed while supplying a gas having good thermal conductivity from the lower part of the steel ingot between the outer peripheral surface of the steel ingot and the inner wall surface of the mold. Production method.
である請求項１記載のエレクトロスラグ再溶解法による
鋼塊の製造方法。2. The method for producing a steel ingot by the electroslag remelting method according to claim 1, wherein the gas having good thermal conductivity is helium gas.
ヘリウムガスとの混合ガスである請求項１記載のエレク
トロスラグ再溶解法による鋼塊の製造方法。3. The method for producing a steel ingot by the electroslag remelting method according to claim 1, wherein the gas having good thermal conductivity is a mixed gas with hydrogen gas or helium gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18428195A JPH0929420A (en) | 1995-07-20 | 1995-07-20 | Production of steel ingot by electroslag remelting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18428195A JPH0929420A (en) | 1995-07-20 | 1995-07-20 | Production of steel ingot by electroslag remelting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0929420A true JPH0929420A (en) | 1997-02-04 |
Family
ID=16150579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18428195A Withdrawn JPH0929420A (en) | 1995-07-20 | 1995-07-20 | Production of steel ingot by electroslag remelting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0929420A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003521377A (en) * | 2000-02-03 | 2003-07-15 | ゼネラル・エレクトリック・カンパニイ | Casting apparatus and method with auxiliary cooling to liquidus part of casting |
| DE10208903A1 (en) * | 2002-02-28 | 2003-09-18 | Ald Vacuum Techn Ag | Furnace for remelting a metal block has a gas-filled gap between the block and the inner wall of the crucible to give effective heat take-off and prevent dispersion of the molten metal |
| JP2006265621A (en) * | 2005-03-23 | 2006-10-05 | Kobe Steel Ltd | Work roll for cold rolling and method for producing ingot for work roll |
| JP2009167511A (en) * | 2008-01-21 | 2009-07-30 | Sumitomo Metal Ind Ltd | Ingot manufacturing method by electroslag remelting method |
| JP2012529369A (en) * | 2009-06-12 | 2012-11-22 | エーエルデー・バキューム・テクノロジーズ・ゲーエムベーハー | Method and apparatus for remelting metal in an electric furnace |
| WO2014156942A1 (en) * | 2013-03-28 | 2014-10-02 | 日立金属株式会社 | Process for manufacturing maraging steel and method for refining inclusions |
| CN104831081A (en) * | 2015-05-26 | 2015-08-12 | 重庆钢铁(集团)有限责任公司 | Electroslag smelting method |
| CN112301230A (en) * | 2020-09-04 | 2021-02-02 | 武汉科技大学 | A hollow electroslag remelting consumable electrode and its preparation method and electroslag remelting method |
| CN114273643A (en) * | 2021-12-16 | 2022-04-05 | 舞阳钢铁有限责任公司 | Method for improving percent of pass of large single-weight high-alloy electroslag ingot |
-
1995
- 1995-07-20 JP JP18428195A patent/JPH0929420A/en not_active Withdrawn
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003521377A (en) * | 2000-02-03 | 2003-07-15 | ゼネラル・エレクトリック・カンパニイ | Casting apparatus and method with auxiliary cooling to liquidus part of casting |
| DE10208903A1 (en) * | 2002-02-28 | 2003-09-18 | Ald Vacuum Techn Ag | Furnace for remelting a metal block has a gas-filled gap between the block and the inner wall of the crucible to give effective heat take-off and prevent dispersion of the molten metal |
| DE10208903B4 (en) * | 2002-02-28 | 2005-07-14 | Ald Vacuum Technologies Ag | Furnace for remelting a titanium block |
| JP2006265621A (en) * | 2005-03-23 | 2006-10-05 | Kobe Steel Ltd | Work roll for cold rolling and method for producing ingot for work roll |
| JP2009167511A (en) * | 2008-01-21 | 2009-07-30 | Sumitomo Metal Ind Ltd | Ingot manufacturing method by electroslag remelting method |
| US8662142B2 (en) | 2009-06-12 | 2014-03-04 | Ald Vacuum Technologies Gmbh | Method and device for remelting metal in an electric furnace |
| JP2012529369A (en) * | 2009-06-12 | 2012-11-22 | エーエルデー・バキューム・テクノロジーズ・ゲーエムベーハー | Method and apparatus for remelting metal in an electric furnace |
| WO2014156942A1 (en) * | 2013-03-28 | 2014-10-02 | 日立金属株式会社 | Process for manufacturing maraging steel and method for refining inclusions |
| CN105308196A (en) * | 2013-03-28 | 2016-02-03 | 日立金属株式会社 | Production method of maraging steel and method of miniaturization of inclusions |
| JPWO2014156942A1 (en) * | 2013-03-28 | 2017-02-16 | 日立金属株式会社 | Method for producing maraging steel and method for refinement of inclusions |
| EP2980233A4 (en) * | 2013-03-28 | 2017-03-29 | Hitachi Metals, Ltd. | Process for manufacturing maraging steel and method for refining inclusions |
| CN104831081A (en) * | 2015-05-26 | 2015-08-12 | 重庆钢铁(集团)有限责任公司 | Electroslag smelting method |
| CN112301230A (en) * | 2020-09-04 | 2021-02-02 | 武汉科技大学 | A hollow electroslag remelting consumable electrode and its preparation method and electroslag remelting method |
| CN114273643A (en) * | 2021-12-16 | 2022-04-05 | 舞阳钢铁有限责任公司 | Method for improving percent of pass of large single-weight high-alloy electroslag ingot |
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