JP4703901B2 - How to make erosion prevention coating - Google Patents

How to make erosion prevention coating Download PDF

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Publication number
JP4703901B2
JP4703901B2 JP2001212109A JP2001212109A JP4703901B2 JP 4703901 B2 JP4703901 B2 JP 4703901B2 JP 2001212109 A JP2001212109 A JP 2001212109A JP 2001212109 A JP2001212109 A JP 2001212109A JP 4703901 B2 JP4703901 B2 JP 4703901B2
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Prior art keywords
stellite
erosion
film
annealing
notch
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JP2003027206A (en
Inventor
寿男 野田
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Mitsubishi Heavy Industries Compressor Corp
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Mitsubishi Heavy Industries Compressor Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、タービンロータの動翼の蒸気入口側の表面あるいは蒸気タービンの主蒸気加減弁の蒸気入口部の表面におけるエロージョンを防止するための皮膜の作成方法に関し、特に、エロージョン防止皮膜を低温で作成することにより、動翼部の疲労限度を低下させることなく、また密着性等の品質確保を容易にするための新規な改良に関する。
【０００２】
【従来の技術】
図５は、従来の蒸気タービンの動翼を概略的に示す構成図である。
図６は、従来の蒸気タービンの動翼の要部を拡大して示す構成図である。
図７は、図６におけるＣ−Ｃ断面を概略的に示す断面図である。
図５に示すように、タービンロータ２の回りには複数の動翼１Ａ〜１Ｇが植設されており、これら複数段の動翼１Ａ〜１Ｇに主蒸気加減弁３を通じて矢印で示す蒸気ｇをあてることによってタービンロータ２を回転させ、この回転動力を発電機や圧縮機等の運転に利用している。
【０００３】
図６および図７に示すように、蒸気ｇは矢印のように流れることにより動翼１を介してタービンロータ２を回転させる。
このように、主蒸気加減弁３を通じて導入される高温・高圧の蒸気ｇは、高圧段側の動翼１Ａ〜１Ｄを経て低圧段側の動翼１Ｅ〜１Ｇへと流入する。このとき、低圧段側ではエロージョンが発生し易い低温・低圧の蒸気ｇ’となる。
そこで従来は、主として低圧段の動翼１Ｅ〜１Ｇの蒸気入口側の表面１ａに、ステライト板１ｂを銀ろうで貼り付け、エロージョンを防止する方法が一般に行なわれていた。
【０００４】
【発明が解決しようとする課題】
従来の装置は以上のように構成されていたため、次のような課題が存在していた。すなわち、銀ろう付けは高温下で行われるため、動翼母材（ステンレス鋼）の疲労限度が大幅（１／２〜１／３）に低下してしまうため設計上の制約が生じ、また、動翼１Ａ〜１Ｇのプロファイル形状が複雑なため、低圧側の動翼１Ｅ〜１Ｇにおけるステライト板の密着性等の品質確保が難しいなどといった課題があった。
【０００５】
本発明は、以上のような課題を解決するためになされたもので、特に、動翼母材の疲労限度が大幅に低下しない温度範囲の低温でステライト皮膜を形成することにより、動翼母材の疲労限度を低下させることなく、また密着性等の品質確保を容易にするためのエロージョン防止皮膜の作成方法を提供することを目的とする。
【０００６】
本発明のエロージョン防止皮膜の作成方法は、タービンロータの動翼の蒸気入口側の表面に切欠部を形成する工程と、前記切欠部にステライト材を溶射する工程と焼鈍する工程とを備え、前記動翼の前記蒸気入口側の表面にステライト皮膜を形成するエロージョン防止皮膜の作成方法であって、前記溶射工程は２０Ａ以下の低電流を使用し、溶射時の過大入熱を防止するＰＴＡ（Ｐｌａｓｍａ Ｔｒａｎｓｆｅｒｒｅｄ Ａｒｃ）法を用いてステライト材で前記切欠部を埋める工程であり、前記焼鈍工程は前記動翼を５５０〜６５０0Ｃで１時間焼鈍する工程である構成である。また、本発明の他の形態に係るエロージョン防止皮膜の作成方法は、蒸気タービンの主蒸気加減弁の蒸気入口部の表面に切欠部を形成する工程と、前記切欠部にステライト材を溶射する工程と焼鈍する工程とを備え、前記主蒸気加減弁の蒸気入口部の表面にステライト皮膜を形成するエロージョン防止皮膜の作成方法であって、前記溶射工程は２０Ａ以下の低電流を使用し、溶射時の過大入熱を防止するＰＴＡ（Ｐｌａｓｍａ Ｔｒａｎｓｆｅｒｒｅｄ Ａｒｃ）法を用いてステライト材で前記切欠部を埋める工程であり、前記焼鈍工程は前記主蒸気加減弁を５５０〜６５０0Ｃで１時間焼鈍する工程である構成である。
【０００７】
【発明の実施の形態】
以下、図面と共に本発明によるエロージョン防止皮膜の作成方法の好適な実施の形態について詳細に説明する。
なお、従来装置と同一または同等部分には同一符号を付し、その説明を省略する。
【０００８】
実施の形態１．
図１は、本発明のエロージョン防止皮膜の作成方法により工作される動翼１の要部を概略的に示す構成図である。
本発明のエロージョン防止皮膜の作成方法では、図示するように、低圧段側の動翼１Ｅ〜１Ｇの蒸気入口側の表面１ａにステライト材を溶射することによりエロージョン防止皮膜としてのステライト皮膜を形成するものである。溶射は、例えばＰＴＡ（Ｐｌａｓｍａ Ｔｒａｎｓｆｅｒｒｅｄ Ａｒｃ）等の方法で行う。
このような溶射によるステライト皮膜１ｄの形成は、主としてエロージョンが発生し易い低圧段、例えば図５に示す動翼１Ｅ、１Ｆ、１Ｇを対象として行うものである。
【０００９】
図２は、本発明のエロージョン防止皮膜の作成方法によるステライト皮膜の作成工程を段階的に示す概念図である。
まず、図２（ａ）に示すように、対象とする低圧段の動翼１Ｅ〜１Ｇの蒸気入口側の表面１ａに、所定深さの切欠部１ｃを形成する。次に図２（ｂ）に示すように、この切欠部１ｃに対して、溶射ノズル４よりステライト材を吹き付けるが、動翼母材の疲労限度が大幅に低下しない程度（従来のように１／２〜１／３のように大幅に低下しない程度）の温度範囲で行うべく、この溶射には２０Ａ以下の低電流を使用するＰＴＡ法を用いる。さらに動翼を５５０〜６５０0Ｃの温度で約１時間程度焼鈍し、空冷した後にステライト材を吹き付けた部分の表面を研磨して仕上げればステライト皮膜１ｄが完成する。
【００１０】
上述のように、本発明のエロージョン防止皮膜の作成方法によれば、エロージョンが発生し易い低圧段の動翼１Ｅ〜１Ｇの蒸気入口側の表面１ａに、低電流を使用してステライト材を溶射し、その後焼鈍してステライト皮膜１ｄを形成するため、従来のように銀ろう付けによる高温下でステライト板１ｂが熱影響を受けることがなく、動翼母材の硬度は通常の硬度が確保できて疲労限度の低下が生じにくい。また、溶射による変形はほとんど起こらず、応力腐食割れの恐れもない。従来のようにステライト板１ｂを貼り付けていた場合に比べて低コストとなるなどの有利な効果があり、良質で経済的なエロージョン防止皮膜としてのステライト皮膜１ｄを作成することができる。
【００１１】
なお、図１に示すタービンロータ２では、説明の便宜上、動翼１Ａ〜１Ｄを高圧段とし、動翼１Ｅ〜１Ｇを低圧段として分けて説明したが、タービンロータ２の構成によって高圧段と低圧段の範囲は異なるものであり、ここでは複数段ある動翼１Ａ〜１Ｇのうちの低圧段のものにステライト皮膜を形成する場合について説明したに過ぎない。従って、必要な場合には全ての動翼１Ａ〜１Ｇに本発明の作成方法によりステライト皮膜を施しても良い。
【００１２】
また、ここではＰＴＡ法を用いて溶射工程を行う場合について説明したが、この溶射工程は、動翼母材の疲労限度が大幅に低下しない程度（従来のように１／２〜１／３のように大幅に低下しない程度）の温度範囲で行う工程であって、動翼母材があまり熱影響を受けない方法であれば、他の方法でも良い。
【００１３】
実施の形態２．
本発明の実施の形態２に係るエロージョン防止皮膜の作成方法は、蒸気タービンの主蒸気加減弁３の蒸気入口部の表面３ｃにステライト皮膜３ｄを作成するものである。
図３は、本発明の実施の形態２に係るエロージョン防止皮膜の作成方法によりステライト皮膜を形成する主蒸気加減弁の蒸気入口部の構成を概略的に示す側面図である。
図４は、図３に示す主蒸気加減弁の蒸気入口部のＢ−Ｂ断面を概略的に示す断面図である。
【００１４】
図３及び図４に示すように、主蒸気加減弁３（図５参照）の弁体３ａが係合する弁座３ｂの蒸気入口周りの表面３ｃに、実施の形態１の場合と同様にステライト材を２０Ａの低電流で溶射した後、溶射部周りを５５０〜６５０0Ｃの温度で約１時間程度焼鈍し、空冷した後仕上げ研磨してステライト皮膜３ｄを完成させる。
【００１５】
このように本発明のエロージョン防止皮膜の作成方法を用れば、弁座母材の疲労限度を大幅に低下させることなく（従来のように１／２〜１／３のように大幅に低下させることなく）、蒸気タービンの主蒸気加減弁３の弁体３ａが係合する弁座３ｂの蒸気入口周りの表面３ｃにエロージョン防止効果の高いステライト皮膜３ｄを低コストで作成することができる。
【００１６】
【発明の効果】
本発明のエロージョン防止皮膜の作成方法によれば、溶射工程は動翼母材の疲労限度が大幅に低下しない温度範囲で行う工程であり、前記焼鈍工程は前記動翼を５５０〜６５０0Ｃで約１時間焼鈍する工程であるので、従来のように銀ろう付けによる高温下で熱影響を受けることがなく、動翼母材の硬度は通常の硬度が確保できて疲労限度の低下が生じにくく、溶射による変形はほとんど起こらず、応力腐食割れの恐れのない低コストエロージョン防止皮膜を作成することができる。
また、本発明の他の形態に係るエロージョン防止皮膜の作成方法によれば、溶射工程は弁座母材の疲労限度が大幅に低下しない温度範囲で行う工程であり、前記焼鈍工程は前記主蒸気加減弁を５５０〜６５０0Ｃで約１時間焼鈍する工程であるので、弁座母材の疲労限度を大幅に低下させることなく、蒸気タービンの主蒸気加減弁の弁体が係合する弁座の蒸気入口周りの表面にエロージョン防止効果の高いステライト皮膜を低コストで作成することができる。
【図面の簡単な説明】
【図１】本発明のエロージョン防止皮膜の作成方法により工作される動翼１の要部を概略的に示す構成図である。
【図２】本発明のエロージョン防止皮膜の作成方法によるステライト皮膜の作成工程を段階的に示す概念図である。
【図３】本発明の実施の形態２に係るエロージョン防止皮膜の作成方法によりステライト皮膜を形成する主蒸気加減弁の蒸気入口部の構成を概略的に示す側面図である。
【図４】図３に示す主蒸気加減弁の蒸気入口部のＢ−Ｂ断面を概略的に示す断面図である。
【図５】従来の蒸気タービンの動翼を概略的に示す構成図である。
【図６】従来の蒸気タービンの動翼の要部を拡大して示す構成図である。
【図７】図６におけるＣ−Ｃ断面を概略的に示す断面図である。
【符号の説明】
１Ａ〜１Ｇ 動翼
１ａ 蒸気入口側の表面
１ｃ 切欠部
１ｄ ステライト皮膜
２ タービンロータ
３ 主蒸気加減弁
３ａ 弁体
３ｂ 弁座
３ｃ 蒸気入口周りの表面
３ｄ ステライト皮膜
４ 溶射ノズル
ｇ、ｇ’ 蒸気[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of forming a coating for preventing erosion on the surface of a turbine rotor blade on the steam inlet side or the surface of a steam inlet of a main steam control valve of a steam turbine. The present invention relates to a novel improvement for facilitating ensuring quality such as adhesion without lowering the fatigue limit of the moving blade portion.
[0002]
[Prior art]
FIG. 5 is a configuration diagram schematically showing a moving blade of a conventional steam turbine.
FIG. 6 is a configuration diagram illustrating an enlarged main part of a moving blade of a conventional steam turbine.
FIG. 7 is a cross-sectional view schematically showing a CC cross section in FIG. 6.
As shown in FIG. 5, a plurality of moving blades 1 </ b> A to 1 </ b> G are implanted around the turbine rotor 2, and steam g indicated by an arrow passes through the main steam control valve 3 to the plurality of moving blades 1 </ b> A to 1 </ b> G. The turbine rotor 2 is rotated by being applied, and this rotational power is used for the operation of a generator, a compressor, and the like.
[0003]
As shown in FIGS. 6 and 7, the steam g flows as indicated by an arrow, thereby rotating the turbine rotor 2 via the moving blade 1.
As described above, the high-temperature / high-pressure steam g introduced through the main steam control valve 3 flows into the low-pressure stage-side moving blades 1E-1G through the high-pressure stage-side moving blades 1A-1D. At this time, the low-pressure stage side becomes a low-temperature / low-pressure steam g ′ in which erosion easily occurs.
Therefore, conventionally, a method of preventing erosion by sticking a stellite plate 1b with silver brazing to the surface 1a on the steam inlet side of the low-pressure stage blades 1E to 1G has been generally performed.
[0004]
[Problems to be solved by the invention]
Since the conventional apparatus is configured as described above, the following problems exist. In other words, since silver brazing is performed at a high temperature, the fatigue limit of the rotor blade base material (stainless steel) is greatly reduced (1/2 to 1/3), resulting in design restrictions, Since the profile shapes of the moving blades 1A to 1G are complicated, there is a problem that it is difficult to ensure quality such as adhesion of the stellite plate in the moving blades 1E to 1G on the low pressure side.
[0005]
The present invention has been made to solve the above-described problems, and in particular, by forming a stellite film at a low temperature in a temperature range in which the fatigue limit of the rotor blade base material is not significantly reduced, It is an object of the present invention to provide a method for producing an erosion-preventing coating for facilitating ensuring quality such as adhesion without lowering the fatigue limit.
[0006]
The method for producing an erosion-preventing film of the present invention comprises a step of forming a notch on the steam inlet side surface of a rotor blade of a turbine rotor, a step of spraying a stellite material on the notch, and a step of annealing. A method for producing an erosion-preventing film for forming a stellite film on a surface of a moving blade on a steam inlet side, wherein the thermal spraying process uses a low current of 20 A or less and prevents excessive heat input during thermal spraying. Transferred Arc) method is a step of filling the notch with stellite material with said annealing step is a construction is a step of annealing 1 hour the blades at 550 to 650 0 C. Further, the method for creating an erosion prevention film according to another embodiment of the present invention includes a step of forming a notch on the surface of the steam inlet of the main steam control valve of the steam turbine, and a step of spraying a stellite material on the notch. and a step of annealing a, to a method of making an erosion prevention film for forming a stellite film on the surface of the steam inlet portion of the main steam control valve, wherein the spray process uses the following low current 20A, during spraying Is a step of filling the notch with a stellite material using a PTA (Plasma Transferred Arc) method for preventing excessive heat input , and the annealing step is a step of annealing the main steam control valve at 550 to 650 0 C for 1 hour. It is the composition which is.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a method for producing an erosion-preventing film according to the present invention will be described in detail with reference to the drawings.
In addition, the same code | symbol is attached | subjected to the same or equivalent part as a conventional apparatus, and the description is abbreviate | omitted.
[0008]
Embodiment 1 FIG.
FIG. 1 is a configuration diagram schematically showing a main part of a moving blade 1 machined by the method for producing an erosion-preventing film of the present invention.
In the method for producing an erosion-preventing film of the present invention, as shown in the figure, a stellite film is formed as a erosion-preventing film by spraying a stellite material on the surface 1a on the steam inlet side of the low-pressure stage rotor blades 1E to 1G. Is. The thermal spraying is performed by a method such as PTA (Plasma Transferred Arc).
The formation of the stellite coating 1d by such thermal spraying is performed mainly for the low pressure stage where erosion is likely to occur, for example, the moving blades 1E, 1F, and 1G shown in FIG.
[0009]
FIG. 2 is a conceptual diagram showing step-by-step the stellite film forming process by the erosion-preventing film forming method of the present invention.
First, as shown in FIG. 2A, a notch 1c having a predetermined depth is formed on the surface 1a on the steam inlet side of the target low-pressure stage blades 1E to 1G. Next, as shown in FIG. 2 (b), a stellite material is sprayed from the thermal spray nozzle 4 to the notch 1c, but the fatigue limit of the rotor blade base material is not significantly reduced (as in the conventional case 1 / PTA method using a low current of 20 A or less is used for this thermal spraying so that the thermal spraying is performed in a temperature range in which the temperature does not drop significantly as 2 to 1/3. Further, if the rotor blade is annealed at a temperature of 550 to 650 0 C for about 1 hour, air-cooled and then the surface of the portion sprayed with the stellite material is polished and finished, the stellite film 1d is completed.
[0010]
As described above, according to the method for creating an erosion-preventing film of the present invention, a stellite material is sprayed on the surface 1a on the steam inlet side of the low-pressure stage moving blades 1E to 1G where erosion is likely to occur using a low current. Then, since the stellite film 1d is formed by annealing, the stellite plate 1b is not affected by heat at a high temperature by silver brazing as in the prior art, and the hardness of the rotor blade base material can be ensured to be normal. The fatigue limit is less likely to occur. Further, deformation due to thermal spraying hardly occurs and there is no fear of stress corrosion cracking. Compared to the case where the stellite plate 1b is pasted as in the prior art, there is an advantageous effect such as low cost, and the stellite film 1d as a high-quality and economical erosion-preventing film can be produced.
[0011]
In the turbine rotor 2 shown in FIG. 1, for convenience of explanation, the rotor blades 1 </ b> A to 1 </ b> D are described as high-pressure stages and the rotor blades 1 </ b> E to 1 </ b> G are separately described as low-pressure stages. The range of the stages is different, and here, only the case where the stellite film is formed on the low-pressure stage of the plurality of moving blades 1A to 1G is described. Therefore, if necessary, all the moving blades 1A to 1G may be provided with a stellite film by the production method of the present invention.
[0012]
In addition, although the case where the thermal spraying process is performed using the PTA method has been described here, the thermal spraying process is performed to such an extent that the fatigue limit of the rotor blade base material is not significantly reduced (1/2 to 1/3 as in the prior art). Other methods may be used as long as the method is performed in a temperature range that does not significantly decrease the temperature of the moving blade base material so that it is not affected by heat.
[0013]
Embodiment 2. FIG.
The method for creating an erosion-preventing film according to Embodiment 2 of the present invention is to create a stellite film 3d on the surface 3c of the steam inlet portion of the main steam control valve 3 of the steam turbine.
FIG. 3 is a side view schematically showing a configuration of a steam inlet portion of a main steam control valve that forms a stellite film by the method for creating an erosion-preventing film according to Embodiment 2 of the present invention.
4 is a cross-sectional view schematically showing a BB cross section of the steam inlet portion of the main steam control valve shown in FIG. 3.
[0014]
As shown in FIGS. 3 and 4, the surface 3c around the steam inlet of the valve seat 3b with which the valve body 3a of the main steam control valve 3 (see FIG. 5) engages is stellite as in the first embodiment. After the material is sprayed at a low current of 20 A, the periphery of the sprayed portion is annealed at a temperature of 550 to 650 0 C for about 1 hour, air cooled, and then finish-polished to complete the stellite film 3d.
[0015]
Thus, if the method for producing an erosion-preventing film of the present invention is used, the fatigue limit of the valve seat base material is not significantly reduced (as in the conventional case, it is greatly reduced to 1/2 to 1/3). In other words, the stellite film 3d having a high erosion prevention effect can be formed at a low cost on the surface 3c around the steam inlet of the valve seat 3b with which the valve body 3a of the main steam control valve 3 of the steam turbine is engaged.
[0016]
【The invention's effect】
According to the method for producing an erosion-preventing film of the present invention, the thermal spraying process is a process performed in a temperature range where the fatigue limit of the rotor blade base material is not significantly reduced, and the annealing process is performed at 550 to 650 0 C. Because it is a process of annealing for about 1 hour, it is not affected by heat at high temperatures due to silver brazing as in the past, and the hardness of the rotor blade base metal can ensure the normal hardness, and the fatigue limit is unlikely to decrease. Thus, deformation due to thermal spraying hardly occurs, and a low-cost erosion-preventing film that does not cause stress corrosion cracking can be produced.
Further, according to the method for creating an erosion-preventing film according to another embodiment of the present invention, the thermal spraying process is a process performed in a temperature range in which the fatigue limit of the valve seat base material is not significantly reduced, and the annealing process is the main steam. Since the adjusting valve is a step of annealing at 550 to 650 0 C for about 1 hour, the valve seat with which the valve body of the main steam control valve of the steam turbine is engaged without significantly reducing the fatigue limit of the valve seat base material. A stellite film having a high erosion-preventing effect can be produced at a low cost on the surface around the steam inlet.
[Brief description of the drawings]
FIG. 1 is a configuration diagram schematically showing a main part of a moving blade 1 machined by a method for producing an erosion prevention film of the present invention.
FIG. 2 is a conceptual diagram showing step by step a stellite film creation process by the erosion prevention film creation method of the present invention.
FIG. 3 is a side view schematically showing a configuration of a steam inlet portion of a main steam control valve for forming a stellite film by a method for creating an erosion prevention film according to Embodiment 2 of the present invention.
4 is a cross-sectional view schematically showing a BB cross section of a steam inlet portion of the main steam control valve shown in FIG. 3;
FIG. 5 is a configuration diagram schematically showing a moving blade of a conventional steam turbine.
FIG. 6 is an enlarged configuration diagram showing a main part of a moving blade of a conventional steam turbine.
7 is a cross-sectional view schematically showing a CC cross section in FIG. 6;
[Explanation of symbols]
1A to 1G Rotor blade 1a Steam inlet side surface 1c Notch 1d Stellite coating 2 Turbine rotor 3 Main steam control valve 3a Valve body 3b Valve seat 3c Surface around steam inlet 3d Stellite coating 4 Thermal spray nozzles g, g 'steam

Claims (2)

タービンロータの動翼の蒸気入口側の表面に切欠部を形成する工程と、前記切欠部にステライト材を溶射する工程と焼鈍する工程とを備え、前記動翼の前記蒸気入口側の表面にステライト皮膜を形成するエロージョン防止皮膜の作成方法であって、
前記溶射工程は２０Ａ以下の低電流を使用し、溶射時の過大入熱を防止するＰＴＡ（Ｐｌａｓｍａ Ｔｒａｎｓｆｅｒｒｅｄ Ａｒｃ）法を用いてステライト材で前記切欠部を埋める工程であり、
前記焼鈍工程は前記動翼を５５０〜６５０0Ｃで１時間焼鈍する工程であることを特徴とするエロージョン防止皮膜の作成方法。A step of forming a notch portion on the steam inlet side surface of the rotor blade of the turbine rotor, a step of spraying a stellite material on the notch portion and a step of annealing, and a step of forming a stellite on the surface of the rotor blade on the steam inlet side. A method for creating an erosion-preventing film that forms a film,
The thermal spraying step is a step of filling the notch with a stellite material using a PTA (Plasma Transferred Arc) method using a low current of 20 A or less and preventing excessive heat input during thermal spraying ,
The method for producing an erosion-preventing film, wherein the annealing step is a step of annealing the blade at 550 to 650 0 C for 1 hour. 蒸気タービンの主蒸気加減弁の蒸気入口部の表面に切欠部を形成する工程と、前記切欠部にステライト材を溶射する工程と焼鈍する工程とを備え、前記主蒸気加減弁の蒸気入口部の表面にステライト皮膜を形成するエロージョン防止皮膜の作成方法であって、
前記溶射工程は２０Ａ以下の低電流を使用し、溶射時の過大入熱を防止するＰＴＡ（Ｐｌａｓｍａ Ｔｒａｎｓｆｅｒｒｅｄ Ａｒｃ）法を用いてステライト材で前記切欠部を埋める工程であり、
前記焼鈍工程は前記主蒸気加減弁を５５０〜６５０0Ｃで１時間焼鈍する工程であることを特徴とするエロージョン防止皮膜の作成方法。A step of forming a notch on the surface of the steam inlet of the main steam control valve of the steam turbine, a step of spraying a stellite material to the notch, and a step of annealing, comprising the step of forming the steam inlet of the main steam control valve A method of creating an erosion-preventing film that forms a stellite film on the surface,
The thermal spraying step is a step of filling the notch with a stellite material using a PTA (Plasma Transferred Arc) method using a low current of 20 A or less and preventing excessive heat input during thermal spraying ,
The method for producing an erosion-preventing film, wherein the annealing step is a step of annealing the main steam control valve at 550 to 650 0 C for 1 hour.
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JPS5445637A (en) * 1977-07-05 1979-04-11 Union Carbide Corp Method of forming hard wearrresistant coating and coating product using same
JPS62113802A (en) * 1985-11-13 1987-05-25 Toshiba Corp Turbine blade
JPH01139749A (en) * 1987-11-27 1989-06-01 Tocalo Co Ltd Surface treatment for blade member
JPH01198460A (en) * 1988-02-03 1989-08-10 Tocalo Co Ltd Manufacture of conductor roll
JPH02236265A (en) * 1989-03-09 1990-09-19 Nippon Steel Corp Formation of erosion resistant coating layer of turbine vane
JPH06145943A (en) * 1992-11-05 1994-05-27 Toshiba Corp Erosion resistant and wear resistant surface treatment
JPH0867957A (en) * 1994-08-29 1996-03-12 Nippon Steel Corp Non-migration type plasma spraying cladding method
JP2001107833A (en) * 1999-10-08 2001-04-17 Toshiba Corp Hydraulic machine and its manufacturing device

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Publication number Priority date Publication date Assignee Title
JPS5445637A (en) * 1977-07-05 1979-04-11 Union Carbide Corp Method of forming hard wearrresistant coating and coating product using same
JPS62113802A (en) * 1985-11-13 1987-05-25 Toshiba Corp Turbine blade
JPH01139749A (en) * 1987-11-27 1989-06-01 Tocalo Co Ltd Surface treatment for blade member
JPH01198460A (en) * 1988-02-03 1989-08-10 Tocalo Co Ltd Manufacture of conductor roll
JPH02236265A (en) * 1989-03-09 1990-09-19 Nippon Steel Corp Formation of erosion resistant coating layer of turbine vane
JPH06145943A (en) * 1992-11-05 1994-05-27 Toshiba Corp Erosion resistant and wear resistant surface treatment
JPH0867957A (en) * 1994-08-29 1996-03-12 Nippon Steel Corp Non-migration type plasma spraying cladding method
JP2001107833A (en) * 1999-10-08 2001-04-17 Toshiba Corp Hydraulic machine and its manufacturing device

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