JP3302506B2 - Electroslag remelting electrode and method for producing electroslag remelted steel ingot - Google Patents
Electroslag remelting electrode and method for producing electroslag remelted steel ingotInfo
- Publication number
- JP3302506B2 JP3302506B2 JP11609194A JP11609194A JP3302506B2 JP 3302506 B2 JP3302506 B2 JP 3302506B2 JP 11609194 A JP11609194 A JP 11609194A JP 11609194 A JP11609194 A JP 11609194A JP 3302506 B2 JP3302506 B2 JP 3302506B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- electroslag
- dissolution rate
- esr
- steel ingot
- 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.)
- Expired - Fee Related
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- Manufacture And Refinement Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、異成分領域を有する高
低圧一体タービンロータなどの製造に使用されるエレク
トロスラグ再溶解（以下「ＥＳＲ」という）用電極およ
びこの電極を用いたＥＳＲ鋼塊の製造方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode for electroslag remelting (hereinafter referred to as "ESR") used for manufacturing a high-low pressure integrated turbine rotor having a heterogeneous region, and an ESR ingot using the electrode. And a method for producing the same.
【０００２】[0002]
【従来の技術】従来、高低圧一体タービンロータでは、
高圧部、中圧部、低圧部によってそれぞれ要求される特
性が異なるため、それぞれの特性に合わせて各圧力部に
使用される材料の組成を変えた組成複合型のロータが提
案されている。ところで、特に大型のタービンロータで
は偏析の防止などの観点からＥＳＲ法を用いた製造方法
が広く採用されているが、上記した組成複合型のロータ
を一体的に製造するためには、ロータの組成に合わせて
組成を変えたＥＳＲ電極が必要である。このため具体的
には、成分の異なる鋼塊を軸方向に接合したＥＳＲ電極
（特公昭５２−４２５４号、同５６−１４８４２号等）
や、異なる成分の電極を連続して使用する方法（特開昭
５６−２３３６７号等）が提案されている。2. Description of the Related Art Conventionally, in a high-low pressure integrated turbine rotor,
Since the required characteristics are different depending on the high-pressure part, the medium-pressure part, and the low-pressure part, a composition composite rotor in which the composition of the material used for each pressure part is changed in accordance with each characteristic has been proposed. By the way, a manufacturing method using the ESR method is widely adopted particularly from a viewpoint of preventing segregation in a large-sized turbine rotor. It is necessary to use an ESR electrode whose composition is changed according to the requirements. Therefore, specifically, an ESR electrode in which steel ingots having different components are joined in the axial direction (JP-B Nos. 52-4254, 56-14842, etc.)
Also, a method of continuously using electrodes having different components (Japanese Patent Application Laid-Open No. 56-23367) has been proposed.
【０００３】[0003]
【発明が解決しようとする課題】しかし、いずれの場合
においても、得られたＥＳＲ鋼塊には異なる成分が混じ
りあった遷移領域が広く形成されて、意図した特性が得
られない場合があり、製品としての信頼性に劣るという
問題がある。これに対し、組成の異なる領域間に予め両
成分が融合された中間部分を設けたＥＳＲ電極（特開昭
６０−１３５５３６号）も提案されているが、遷移領域
を十分に減少させるまでには至っていない。この発明は
上記事情を背景としてなされたものであり、遷移領域を
有効に減少させて信頼性の高い製品を製造することがで
きるＥＳＲ用電極およびＥＳＲ鋼塊の製造方法を提供す
ることを目的とする。However, in any case, in the obtained ESR ingot, the transition region where different components are mixed is formed widely, and the intended characteristics may not be obtained. There is a problem that the reliability as a product is poor. On the other hand, an ESR electrode in which an intermediate portion in which both components are fused in advance between regions having different compositions has been proposed (Japanese Patent Application Laid-Open No. 60-135536), but until the transition region is sufficiently reduced. Not reached. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an ESR electrode and a method of manufacturing an ESR steel ingot that can effectively reduce a transition region and manufacture a highly reliable product. I do.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、本発明のうち、第１の発明のエレクトロスラグ再溶
解用電極は、軸方向において化学成分が異なる２以上の
異成分領域からなり、これら異成分領域の境界部分にく
びれ部が形成されており、該くびれ部は、断面積比で通
常太さ部分の０．０４〜０．２５倍からなる最小太さ部
が異成分領域の境界に位置しているとともに通常太さ部
から最小太さ部にかけて外壁面がテーパー形状に形成さ
れているとを特徴とする。 Means for Solving the Problems In order to solve the above problems, among the present invention, the electroslag remelting electrode of the first invention comprises two or more different component regions having different chemical components in the axial direction. Ku at the boundary of these different component area
A constricted portion is formed, and the constricted portion has a cross-sectional area ratio.
Minimum thickness of 0.04 to 0.25 times the normal thickness
Is located at the boundary of the heterogeneous component area and is usually thick
The outer wall surface is tapered from
It is characterized by having been .
【０００５】第２の発明のエレクトロスラグ再溶解鋼塊
の製造方法は、エレクトロスラグ再溶解に際して、軸方
向において化学成分が異なる２以上の異成分領域からな
り、これら異成分領域の境界部分にくびれ部が形成され
ているエレクトロスラグ再溶解用電極を使用するととも
に、この電極のくびれ部の溶解速度を通常太さ部分の溶
解速度よりも小さくすることを特徴とする。第３の発明
のエレクトロスラグ再溶解鋼塊の製造方法は、電極のく
びれ部の溶解速度が、通常太さ部分の溶解速度の２０〜
８０％であることを特徴とする。[0005] A method for producing an electroslag remelted steel ingot according to a second aspect of the present invention is characterized in that, when the electroslag is melted again ,
From two or more different component regions that have different chemical components in different directions.
A constriction is formed at the boundary between these different component regions.
In addition to using the electroslag remelting electrode described above, the dissolution rate of the constricted part of the electrode is made smaller than the dissolution rate of the normally thick part. In the method for producing an electroslag remelted steel ingot according to the third invention, the melting rate of the constricted portion of the electrode is usually 20 to 20 times the melting speed of the thick portion.
It is characterized by being 80%.
【０００６】本発明のＥＳＲ電極は、軸方向で成分の異
なる２以上の異成分領域が例えば溶接や機械的方法で接
合されたものであり、代表的には高低圧一体型タービン
ロータの製造に供される。ただし、本発明としては、異
成分領域の数や用途等が限定されるものでない。また、
この電極は製造される製品に応じた径を有するものであ
り、例えば大型の高低圧一体型タービンロータの製造に
おいては、通常太さ部分で９００〜１３５０ｍｍの径を
有するような電極が使用されるが、本発明としては電極
太さが限定されるものでもない。The ESR electrode of the present invention is obtained by joining two or more different component regions having different components in the axial direction by, for example, welding or a mechanical method, and is typically used for manufacturing a high-low pressure integrated turbine rotor. Provided. However, the present invention does not limit the number, use, and the like of the different component regions. Also,
This electrode has a diameter corresponding to the product to be manufactured. For example, in the manufacture of a large high-low pressure integrated turbine rotor, an electrode having a diameter of 900 to 1350 mm in a thickness portion is usually used. However, the thickness of the electrode is not limited in the present invention.
【０００７】なお、本発明の電極のくびれ部は最小太さ
部を、断面積比で通常太さ部の０．０４〜０．２５倍と
する。一般に電極形状は断面円形であり、円柱電極では
上記内容を換言すれば、くびれ部の最小太さ部を、通常
太さ部分の０．２〜０．５倍の径にすることになる。 [0007] Incidentally, the constricted portion of the electrode of the present invention the minimum thickness portion, and from 0.04 to 0.25 times the normal thickness portion in sectional area ratio
I do. In general, the shape of the electrode is circular in cross section. In the case of a cylindrical electrode, in other words, the minimum thickness of the constricted portion is 0.2 to 0.5 times the diameter of the normal thickness .
【０００８】また、くびれ部の通常太さ部から最小太さ
部にかけては、急激な太さの変化がないように外壁面を
テーパー状に形成する。このテーパー部の傾斜角度は３
０〜６０度とするのが望ましい。この角度が３０度より
も小さいと、テーパー部が必要以上に長くなり、テーパ
ーの形成作業が面倒になる。また、傾斜角度が６０度よ
りも大きいと、断面積の変化が急激であり、溶解速度の
制御が難しくなるためである。Further, the over the minimum thickness portion from the normal thickness portion of the neck portion, that form a outer wall surface tapered such that there is no rapid change in thickness. The inclination angle of this tapered part is 3
Desirably, it is 0 to 60 degrees. If this angle is smaller than 30 degrees, the tapered portion becomes unnecessarily long, and the operation of forming the taper becomes troublesome. On the other hand, if the inclination angle is larger than 60 degrees, the change in the cross-sectional area is sharp, and it is difficult to control the dissolution rate.
【０００９】上記電極を用いてＥＳＲ鋼塊を製造する際
には、フィルレシオ（電極径／鋼塊径）を０．５〜０．
８に設定するのが望ましい。そして電極の溶解速度は、
第２、第３の発明で示すように、くびれ部で通常太さ部
分よりも小さくし（望ましくは２０〜８０％）、さらに
は最小太さ部で最小にするのが望ましい。また、溶解速
度の低下は、急激に変化させないようにくびれ部の前後
の通常太さ部分で徐々に変化（低下または増大）させる
ものであってもよい。When producing an ESR ingot using the above-mentioned electrode, the fill ratio (electrode diameter / steel ingot diameter) is set to 0.5 to 0.
It is desirable to set to 8. And the dissolution rate of the electrode is
As shown in the second and third aspects of the present invention, it is desirable to make the constricted portion smaller than the normal thickness portion (preferably 20 to 80%), and further, to minimize the constriction portion in the minimum thickness portion. In addition, the decrease in the dissolution rate may be gradually changed (decreased or increased) in a normal thickness portion before and after the constricted portion so as not to be drastically changed.
【００１０】[0010]
【作用】すなわち本発明によれば、異なる成分が混じり
合った遷移領域をできるだけ小さくすることができ、異
成分領域の境界部近傍でも所望の特性を得ることができ
る。また、異成分の材料を溶接などによって接合する際
にも、接合部分が小さくなり、作業能率が向上する。次
に、本発明における数値範囲の限定理由を説明する。According to the present invention, the transition region in which different components are mixed can be made as small as possible, and desired characteristics can be obtained even near the boundary between the different component regions. Also, when materials of different components are joined by welding or the like, the joining portion is reduced, and work efficiency is improved. Next, the reason for limiting the numerical range in the present invention will be described.
【００１１】断面積比：０．０４〜０．２５倍 異成分領域の境界部に、断面積の小さいくびれ部を形成
することによって、電極溶解量を減らし、遷移領域を小
さくすることが可能となる。この作用を確実に得るため
には、最小太さ部（通常は上記境界に位置する）の断面
積を通常太さ部分の０．２５倍以下にするのが望まし
い。一方、この断面積比を０．０４倍未満にしても、上
記作用の向上は殆どないばかりでなく、電極として強度
が不十分になるので上記断面積比が望ましい。Cross-sectional area ratio: 0.04 to 0.25 times By forming a constricted portion having a small cross-sectional area at the boundary between different component regions, it is possible to reduce the amount of electrode dissolution and reduce the transition region. Become. In order to surely obtain this effect, it is desirable that the cross-sectional area of the minimum thickness portion (usually located at the boundary) be 0.25 times or less the normal thickness portion. On the other hand, if the cross-sectional area ratio is less than 0.04 times, the above-mentioned action is hardly improved, and the strength as an electrode becomes insufficient. Therefore, the above-mentioned cross-sectional area ratio is desirable.
【００１２】溶解速度：２０〜８０％ 上記したように、電極にくびれ部を設け、このくびれ部
の溶解速度を通常太さ部分よりも小さくすることによっ
て、溶融プールを浅くして遷移領域を小さくできる。上
記作用を十分に得るためには、くびれ部の溶解速度を通
常太さ部分の溶解速度の８０％以下にするのが望まし
い。一方、上記溶解速度を２０％未満にしても、作用の
向上は僅かであり、さらに溶解に長い時間を要して作業
能率が低下するので２０〜８０％にするのが望ましい。
なお、同様の理由で４０〜７０％の範囲にするのが一層
望ましい。この溶解速度は、通常の太さ部の溶解速度に
対する比率で示されるので、絶対的な数値が限定される
ものではないが、例えば、通常太さ部分の溶解速度が８
００〜２０００ｋｇ／ｈｒの場合には、くびれ部の溶解
速度を４００〜１６００ｋｇ／ｈｒに限定するのが望ま
しいこととなる。Dissolution rate: 20 to 80% As described above, by forming a constricted portion on the electrode and making the dissolving speed of the constricted portion smaller than the normal thickness portion, the molten pool is made shallower and the transition region is made smaller. it can. In order to obtain the above effect sufficiently, it is desirable that the dissolution rate of the constricted part is usually 80% or less of the dissolution rate of the thick part. On the other hand, even if the dissolution rate is less than 20%, the effect is slightly improved, and the dissolution takes a long time to lower the work efficiency. Therefore, the dissolution rate is preferably set to 20 to 80%.
For the same reason, it is more desirable to set the range to 40 to 70%. Since the dissolution rate is indicated by a ratio to the dissolution rate of the normal thickness portion, the absolute value is not limited.
In the case of 00 to 2000 kg / hr, it is desirable to limit the dissolution rate of the constricted portion to 400 to 1600 kg / hr.
【００１３】また、前述したように、電極のフィルレシ
オ（電極径／モールド径）を所定範囲内（通常太さ部で
０．５〜０．８）に定めるのが望ましい。これは、フィ
ルレシオが０．５未満であると、必要溶解量を得るには
電極長さを長くしなければならず、作業能率が低下する
ためであり、また、０．８を越えると、モールド壁と電
極との隙間が小さくなり、スラグ注入などの作業が難し
くなること及びモールド壁と電極のスパーク現象が起き
易くなるためである。As described above, it is desirable that the fill ratio (electrode diameter / mold diameter) of the electrode is set within a predetermined range (usually 0.5 to 0.8 in the thickness portion). This is because if the fill ratio is less than 0.5, the electrode length must be increased to obtain the required amount of dissolution, and the working efficiency is reduced. This is because the gap between the mold wall and the electrode becomes small, and the work such as slag injection becomes difficult, and the spark phenomenon between the mold wall and the electrode becomes easy to occur.
【００１４】[0014]
【実施例】表１に示す組成のＣｒＭｏＶ鋼塊１とＮｉＣ
ｒＭｏＶ鋼塊２を常法によって溶製、鍛造した後、それ
ぞれの一端部に機械加工によって先細のテーパー部１
ａ、２ａを形成する。次に、これらテーパー部１ａ、２
ａを突き合わせるようにして鋼塊同士を溶接し、くびれ
部３ａ、通常太さ部分３ｂを有する本発明のＥＳＲ電極
４を製造した。なお、３ｃは、補助電極である。この電
極４の製造に際し、テーパー部同士の溶接は周囲長も短
く短時間で容易に行うことができた。EXAMPLE A CrMoV steel ingot 1 having the composition shown in Table 1 and NiC
After the rMoV ingot 2 is melted and forged by a conventional method, the tapered tapered portion 1 is machined at one end thereof.
a and 2a are formed. Next, these tapered portions 1a, 2a
The steel ingots were welded to each other so as to abut each other to produce an ESR electrode 4 of the present invention having a constricted portion 3a and a normal thickness portion 3b. 3c is an auxiliary electrode. In manufacturing the electrode 4, the welding between the tapered portions was short and the peripheral length was short, so that the welding could be easily performed in a short time.
【００１５】このＥＳＲ電極４は、通常太さ部分３ｂが
径１３５０ｍｍ、くびれ部３ａの最小太さ部分（接合
部）が径５１４ｍｍで、断面積比が約０．１４５であ
る。さらに、テーパー部１ａは、長さが３２０ｍｍ、傾
斜角度αが約５３度であり、テーパー部２ａは、長さが
４００ｍｍ、傾斜角度βが約４６度であった。また、比
較のため、テーパー部を形成することなくＣｒ−Ｍｏ−
Ｖ鋼塊とＮｉ−Ｃｒ−Ｍｏ−Ｖ鋼塊とをそのまま溶接し
た、従来の比較ＥＳＲ電極を用意した。この電極の溶接
作業は、本発明のＥＳＲ電極と異なり、周囲長も長く、
作業に長い時間を要した。The ESR electrode 4 usually has a diameter of 1350 mm in the thickness portion 3b, a diameter of 514 mm in the minimum thickness portion (joining portion) of the constricted portion 3a, and a cross-sectional area ratio of about 0.145. Further, the tapered portion 1a had a length of 320 mm and an inclination angle α of about 53 degrees, and the tapered portion 2a had a length of 400 mm and an inclination angle β of about 46 degrees. Further, for comparison, Cr-Mo-
A conventional comparative ESR electrode was prepared by welding a V steel ingot and a Ni-Cr-Mo-V steel ingot as they were. Unlike the ESR electrode of the present invention, the welding operation of this electrode has a long perimeter,
It took a long time to work.
【００１６】[0016]
【表１】 [Table 1]
【００１７】上記電極を用いて、通常太さ部分の溶解速
度を１６００ｋｇ／ｈｒ、くびれ部の最小太さ部分を同
速度または１０００ｋｇ／ｈｒ（通常深さ部分の６２．
５％）に制御して、エレクトロスラグ再溶解を行い、両
鋼塊の境界部（接合部）に対応したＥＳＲ鋼塊の溶融プ
ール深さを観察することによって遷移領域の大きさを評
価した。本発明の電極を用いて溶解速度を変化させた場
合の溶解線図は図２に示すとおりであり、溶解速度の急
激な変化を避けるため、通常太さ部分から徐々に溶解速
度を変化させた。Using the above electrode, the dissolution rate of the normal thickness portion is 1600 kg / hr, and the minimum thickness portion of the constricted portion is the same speed or 1000 kg / hr (62.
5%), the electroslag was remelted, and the size of the transition region was evaluated by observing the depth of the molten pool of the ESR ingot corresponding to the boundary portion (joining portion) of both ingots. The dissolution diagram when the dissolution rate was changed using the electrode of the present invention is as shown in FIG. 2, and in order to avoid a rapid change in the dissolution rate, the dissolution rate was gradually changed from the normal thickness portion. .
【００１８】上記によって得られたＥＳＲ鋼塊は、表２
に示すように、比較電極を用いた場合、溶融プールが深
く、大きな遷移領域が形成されていることが分かる。こ
れに対し、本発明のＥＳＲ電極を用いた場合には、溶融
プール深さが浅く、特にくびれ部の溶解速度を小さく制
御した場合は、図３に示すように溶融プール深さは顕著
に浅くなっており、遷移領域の減少は明らかである。The ESR ingot obtained as described above is shown in Table 2.
As shown in the graph, when the comparative electrode was used, the molten pool was deep and a large transition region was formed. On the other hand, when the ESR electrode of the present invention is used, the depth of the molten pool is shallow, and particularly when the dissolution rate of the constricted portion is controlled to be small, the depth of the molten pool is remarkably shallow as shown in FIG. The decrease in the transition region is apparent.
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【発明の効果】以上説明したように、本発明によれば、
異成分が混じり合った遷移領域を狭くすることができ、
広い範囲で所望の特性を有する大型複合ＥＳＲ鋼塊の製
造が可能になる。したがって、このＥＳＲ鋼塊を使用す
ることにより信頼性の高い、高低圧一体型タービンロー
タ等の製品を製造することができる。また、ＥＳＲ電極
を用意する際に、異成分鋼塊を容易に接合することがで
き、作業能率が向上する効果もある。As described above, according to the present invention,
The transition region where different components are mixed can be narrowed,
A large composite ESR ingot having desired properties in a wide range can be manufactured. Therefore, by using this ESR steel ingot, it is possible to manufacture a highly reliable product such as a high / low pressure integrated turbine rotor. In addition, when preparing the ESR electrode, it is possible to easily join different component steel ingots, and there is also an effect that work efficiency is improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】図１は、本発明のＥＳＲ電極を示す概略図であ
る。FIG. 1 is a schematic diagram showing an ESR electrode of the present invention.
【図２】図２は、ＥＳＲの際の溶解線図である。FIG. 2 is a dissolution diagram during ESR.
【図３】図３は、本発明の電極を用いて得られたＥＳＲ
鋼塊のプール深さを示す模式図である。FIG. 3 shows the ESR obtained using the electrode of the present invention.
It is a schematic diagram which shows the pool depth of a steel ingot.
１ ＣｒＭｏＶ鋼塊 ２ ＮｉＣｒＭｏＶ
鋼塊 ３ａ くびれ部 ３ｂ 通常太さ部分 ４ ＥＳＲ電極1 CrMoV steel ingot 2 NiCrMoV
Steel ingot 3a Neck 3b Normal thickness 4 ESR electrode
フロントページの続き (56)参考文献 特開 昭49−78601（ＪＰ，Ａ) 特開 昭48−47458（ＪＰ，Ａ) 特公 昭56−14842（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C22B 1/00 - 61/00 B22D 23/10 Continuation of the front page (56) References JP-A-49-78601 (JP, A) JP-A-48-47458 (JP, A) JP-B-56-14842 (JP, B2) (58) Fields investigated (Int) .Cl. 7 , DB name) C22B 1/00-61/00 B22D 23/10
Claims (3)
の異成分領域からなり、これら異成分領域の境界部分に
くびれ部が形成されており、該くびれ部は、断面積比で
通常太さ部分の０．０４〜０．２５倍からなる最小太さ
部が異成分領域の境界に位置しているとともに通常太さ
部から最小太さ部にかけて外壁面がテーパー形状に形成
されていることを特徴とするエレクトロスラグ再溶解用
電極。 The present invention comprises two or more different component regions having different chemical components in the axial direction, and a constricted portion is formed at a boundary portion between these different component regions. Characterized in that the minimum thickness portion 0.04 to 0.25 times is located at the boundary of the different component region and the outer wall surface is formed in a tapered shape from the normal thickness portion to the minimum thickness portion. Electroslag remelting electrode .
向において化学成分が異なる２以上の異成分領域からな
り、これら異成分領域の境界部分にくびれ部が形成され
ているエレクトロスラグ再溶解用電極を使用するととも
に、この電極のくびれ部の溶解速度を通常太さ部分の溶
解速度よりも小さくすることを特徴とするエレクトロス
ラグ再溶解鋼塊の製造方法。 2. An electroslag remelting electrode comprising two or more different component regions having different chemical components in an axial direction and having a constricted portion formed at a boundary portion between these different component regions when remelting the electroslag. And a dissolution rate of the constricted portion of the electrode is made smaller than a dissolution rate of the normally thick portion .
部分の溶解速度の２０〜８０％であることを特徴とする
請求項２記載のエレクトロスラグ再溶解鋼塊の製造方
法。 3. The method for producing an electroslag remelted steel ingot according to claim 2, wherein the dissolution rate of the constricted part of the electrode is usually 20 to 80% of the dissolution rate of the thick part .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11609194A JP3302506B2 (en) | 1994-05-06 | 1994-05-06 | Electroslag remelting electrode and method for producing electroslag remelted steel ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11609194A JP3302506B2 (en) | 1994-05-06 | 1994-05-06 | Electroslag remelting electrode and method for producing electroslag remelted steel ingot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07305121A JPH07305121A (en) | 1995-11-21 |
| JP3302506B2 true JP3302506B2 (en) | 2002-07-15 |
Family
ID=14678494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11609194A Expired - Fee Related JP3302506B2 (en) | 1994-05-06 | 1994-05-06 | Electroslag remelting electrode and method for producing electroslag remelted steel ingot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3302506B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010053023A1 (en) * | 2008-11-04 | 2010-05-14 | 株式会社東芝 | Method for manufacturing a steam turbine rotor, and steam turbine rotor |
| CN104985161B (en) * | 2015-07-24 | 2017-03-01 | 东北大学 | Vacuum electroslag remelting prepares the device and method of dual alloy turbine rotor steel ingot |
-
1994
- 1994-05-06 JP JP11609194A patent/JP3302506B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07305121A (en) | 1995-11-21 |
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