JPH04276038A - Valve for light water nuclear reactor - Google Patents
Valve for light water nuclear reactorInfo
- Publication number
- JPH04276038A JPH04276038A JP3608891A JP3608891A JPH04276038A JP H04276038 A JPH04276038 A JP H04276038A JP 3608891 A JP3608891 A JP 3608891A JP 3608891 A JP3608891 A JP 3608891A JP H04276038 A JPH04276038 A JP H04276038A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve seat
- light water
- seat part
- welding
- 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.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 35
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 16
- 230000003628 erosive effect Effects 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 5
- 229910052718 tin Inorganic materials 0.000 claims abstract description 3
- 235000019589 hardness Nutrition 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005524 ceramic coating Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 7
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract description 2
- 229910017052 cobalt Inorganic materials 0.000 abstract 1
- 239000010941 cobalt Substances 0.000 abstract 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910017318 Mo—Ni Inorganic materials 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004439 roughness measurement Methods 0.000 description 1
- 102220342298 rs777367316 Human genes 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Sliding Valves (AREA)
- Lift Valve (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、コバルトフリーの肉盛
弁座材を有する軽水原子炉用弁に係り、特に耐摩耗性及
び耐エロージョン性に優れた軽水原子炉用弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light water reactor valve having a cobalt-free overlay valve seat material, and more particularly to a light water reactor valve having excellent wear resistance and erosion resistance.
【０００２】0002
【従来の技術】従来、軽水原子炉用の弁の弁座部には、
耐摩耗性及び耐エロージョン性を付与するためにＣｏ基
合金が肉盛溶接されている。しかし、Ｃｏ基合金は、軽
水炉の高温高圧水に接していると、その腐蝕作用によっ
て金属表面からのＣｏが炉水中に溶出する。又、高速流
体によるエロージョンによって金属表面から侵食された
Ｃｏが炉水中に持込まれる。これらのＣｏは炉心中に入
り６０Ｃｏとなり、配管、タービンその他の機器に循環
付着し、このため、軽水炉プラント全体の放射能が増え
、定検作業の被曝量が増大する欠点がある。[Prior Art] Conventionally, the valve seat of a light water reactor valve has a
A Co-based alloy is overlay welded to provide wear resistance and erosion resistance. However, when a Co-based alloy comes into contact with high-temperature, high-pressure water of a light water reactor, Co from the metal surface is eluted into the reactor water due to its corrosive action. In addition, Co eroded from the metal surface by erosion caused by the high-speed fluid is brought into the reactor water. These Co enters the reactor core and becomes 60Co, which circulates and adheres to piping, turbines, and other equipment, which increases the radioactivity of the entire light water reactor plant and increases the amount of radiation exposure during periodic inspection work.
【０００３】他方、弁の弁座部に用いるコバルトフリー
材としては、従来よりＦｅ基合金やＮｉ基合金が使用さ
れているが、耐摩耗性が不十分であった。例えば特開昭
６２−１８３７号に記載のようにＣｒ−Ｎｉ−Ｆｅ系の
鉄基合金と、Ｃｒ−Ｎｂ−Ｍｏ−Ｎｉ系のＮｉ基合金の
組合せとしたものでは、肉盛溶接後の析出硬化熱処理が
非常にむつかしかった。また例えば特開昭６２−１３０
７９２号に示すようにＮｉ基合金同志の組合せとしたも
のでは、同一硬度の為、耐摺動摩耗性が弱いという問題
があった。On the other hand, Fe-based alloys and Ni-based alloys have conventionally been used as cobalt-free materials for the valve seat portion of valves, but these have insufficient wear resistance. For example, in the combination of a Cr-Ni-Fe iron-based alloy and a Cr-Nb-Mo-Ni Ni-based alloy as described in JP-A No. 62-1837, precipitation after overlay welding Curing heat treatment was extremely difficult. For example, JP-A-62-130
As shown in No. 792, a combination of Ni-based alloys had the problem of poor sliding wear resistance because they had the same hardness.
【０００４】0004
【発明が解決しようとする課題】以上の従来の問題点に
鑑み、本発明の目的は、肉盛溶接材にＣｏを含まない合
金を使用し、しかも、前記コバルトフリー材を用いてい
る従来技術の欠点を持たず、耐エロージョン性及び耐摩
耗性に優れた弁箱弁座部表面肉盛材および弁体弁座部表
面肉盛材を有する軽水原子炉用弁を提供することである
。[Problems to be Solved by the Invention] In view of the above-mentioned conventional problems, an object of the present invention is to use an alloy that does not contain Co as an overlay welding material, and to overcome the conventional technology that uses the cobalt-free material. It is an object of the present invention to provide a light water reactor valve which does not have the above disadvantages and has a valve body valve seat surface overlay material and a valve body valve seat surface overlay material which have excellent erosion resistance and wear resistance.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
、本発明者らは、Ｃｏを用いることなく、Ｃｏ基合金と
同等の耐エロージョン及び耐摩耗性を有する材料を得る
ための研究開発を進めてきた結果、本発明に至った。
本発明は、軽水原子炉用弁の弁箱弁座部の表面肉盛材と
弁体弁座部の表面肉盛材とを、いずれも、Ｃｏを含まな
いＮｉ基合金であって且つ互にその化学組成および硬度
が異なるものとしたことを特徴とする。これが、耐摩耗
性の向上及び該材料の良好な耐エロージョン性をもたら
すことを本発明者らは実験で確認することができ、Ｃｏ
基合金と同等の耐摩耗性および耐エロージョン性が得ら
れることが判明した。[Means for Solving the Problem] In order to achieve the above object, the present inventors conducted research and development to obtain a material that has erosion resistance and wear resistance equivalent to Co-based alloys without using Co. As a result of these efforts, we have arrived at the present invention. In the present invention, the surface overlay material of the valve seat part of the valve body and the surface overlay material of the valve seat part of the valve body of a valve for a light water reactor are both made of a Ni-based alloy that does not contain Co, and are mutually They are characterized by having different chemical compositions and hardnesses. The present inventors were able to confirm through experiments that this resulted in improved wear resistance and good erosion resistance of the material.
It was found that wear resistance and erosion resistance equivalent to that of the base alloy can be obtained.
【０００６】[0006]
【作用】本発明によれば、弁体弁座の表面肉盛材と弁箱
弁座の表面肉盛材をいずれも、Ｃｒ−Ｓｉ−Ｆｅ−Ｗ系
のＮｉ基合金とし、且つロックウェル硬度ＨＲＣを一方
が４０〜５５とし、他方が５０〜６０とする。[Operation] According to the present invention, both the surface build-up material of the valve body valve seat and the surface build-up material of the valve body valve seat are made of a Cr-Si-Fe-W based Ni-based alloy, and have Rockwell hardness. One side has an HRC of 40-55, and the other has an HRC of 50-60.
【０００７】本発明における弁体弁座及び弁箱弁座に夫
々用いたＣｒ−Ｓｉ−Ｆｅ−Ｗ系のＮｉ基合金は、一方
は、Ｃｒ１０〜１５％，Ｓｉ３〜７％，Ｆｅ１０％以下
，Ｗ２〜４％，Ｂ１％以下、Ｃ１％以下とし、他方は、
Ｃｒ１５〜２０％，Ｓｉ５〜１０％，Ｆｅ１５％以下、
Ｗ１〜３％，Ｓｎ ０． ５〜１％，Ｂ１％以下，Ｃ
１％以下とする。[0007] The Cr-Si-Fe-W Ni-based alloy used for the valve body valve seat and the valve body valve seat in the present invention is composed of 10 to 15% Cr, 3 to 7% Si, 10% or less Fe, W2 to 4%, B1% or less, C1% or less, and the other is,
Cr15-20%, Si5-10%, Fe15% or less,
W1-3%, Sn 0. 5-1%, B1% or less, C
1% or less.
【０００８】Ｃｒは耐食性を維持するために１０％は必
要である。但し、多量の含有はフェライトの生成を促す
ため最大でも２０％とする。[0008] 10% Cr is required to maintain corrosion resistance. However, since a large amount of content promotes the formation of ferrite, the maximum content is 20%.
【０００９】Ｓｉは硬度と耐摩耗性を維持するために必
要であるが、多量に加えると靭性が低下し溶接施工性が
劣化するので、一方は３〜７％、他方は５〜１０％とす
る。[0009]Si is necessary to maintain hardness and wear resistance, but if added in large amounts, toughness decreases and weldability deteriorates, so one should be 3 to 7% and the other 5 to 10%. do.
【００１０】Ｓｎは耐摩耗性を維持するのに必要である
ので、高硬度の方の合金に含有させる。しかし、多量に
加えると靭性が低下し溶接施工性が劣化するので０．
５〜１％とする。Since Sn is necessary to maintain wear resistance, it is included in the higher hardness alloy. However, if too much is added, the toughness will decrease and weldability will deteriorate, so 0.
5 to 1%.
【００１１】ＢおよびＣは不純物元素として含有される
が、多いと溶接施工性を劣化させるので１％以下に制限
して溶接時および溶接後の熱処理時に割れないようにす
る。[0011] B and C are contained as impurity elements, but if they are present in large amounts, welding performance deteriorates, so they are limited to 1% or less to prevent cracking during welding and post-weld heat treatment.
【００１２】なお、Ｂ，Ｃはいずれも合金の硬度を高め
る効果を有するが、耐摩耗性の維持のためにはＳｉで硬
度を高めるのが望ましいので、不純物として含有量を制
限する。[0012] Both B and C have the effect of increasing the hardness of the alloy, but in order to maintain wear resistance, it is desirable to increase the hardness with Si, so their content is limited as impurities.
【００１３】Ｆｅ，Ｗは、合金の硬さを調整するために
必要であるが、Ｆｅの多量の含有は硬度を低下させ、ま
た、Ｗは靭性を低下させることから、Ｆｅは、一方は１
０％以下、他方は１５％以下とし、Ｗは、一方は２〜４
％，他方は１〜３％とする。[0013] Fe and W are necessary to adjust the hardness of the alloy, but since a large amount of Fe decreases the hardness and W also decreases the toughness, Fe is
One is 0% or less, the other is 15% or less, and W is 2 to 4 on one side.
%, and the other is 1 to 3%.
【００１４】上記説明したような硬度および化学組成の
相違したＮｉ基合金を弁体弁座、弁箱弁座、更にはガイ
ド部にプラズマ粉体溶接、粉末溶射、溶接棒によるティ
グ又はガス溶接することで本発明の効果が得られる。
又、更に摩耗性を向上するために上記肉盛表面にセラミ
ックコーティングすることもできる。Ni-based alloys having different hardnesses and chemical compositions as described above are applied to the valve body valve seat, valve body valve seat, and guide portion by plasma powder welding, powder spraying, TIG welding using a welding rod, or gas welding. In this way, the effects of the present invention can be obtained. Furthermore, the overlay surface may be coated with a ceramic coating to further improve wear resistance.
【００１５】[0015]
【実施例】弁体の弁座材および弁箱の弁座材に用いる合
金として幾つかの供試材合金について実験した。表１に
供試材合金の化学組成を示す。[Example] Experiments were conducted using several test alloys as alloys used for the valve seat material of the valve body and the valve seat material of the valve body. Table 1 shows the chemical composition of the sample alloy.
【００１６】[0016]
【表１】[Table 1]
【００１７】同表の■〜■の供試材については、高周波
真空溶解炉を用いて溶解後ガスアトマイズ法により供試
材合金の粉末を製造した。粉末の粒径は＋７０〜＋２１
０メッシュのものである。その粉末を用いてプラズマ粉
体肉盛溶接法でＳ２５Ｃ（炭素鋼の一種）板材の上に２
層肉盛溶接を行ったものから摩耗試験片を採取し、それ
らのうち２つを組合せて摺動摩耗試験を行なった。摩耗
試験条件としては、面圧を２ｋｇ／ｍｍ２ および５．
５ｋｇ／ｍｍ２ の２通りとし、摺動速度３００ｍｍ
／ｍｉｎにて、摺動回数１００回を室温中、３００℃飽
和水中、及び３００℃飽和蒸気中で実施し、試験終了後
の摺動面の荒れ状態を表面粗さで表す調査をした。表２
に表面粗さの測定結果を示す。For the test materials ① to ② in the same table, powders of the test material alloys were produced by a gas atomization method after melting using a high frequency vacuum melting furnace. Powder particle size is +70~+21
0 mesh. Using the powder, we applied the plasma powder build-up welding method to two sheets of S25C (a type of carbon steel) plate material.
Abrasion test pieces were taken from those subjected to layer overlay welding, and two of them were combined to perform a sliding wear test. The wear test conditions were a surface pressure of 2 kg/mm2 and 5.
Two types of 5kg/mm2, sliding speed 300mm
/min, 100 times of sliding was carried out at room temperature, in 300°C saturated water, and in 300°C saturated steam, and the roughness of the sliding surface after the test was investigated, expressed as surface roughness. Table 2
Figure 2 shows the surface roughness measurement results.
【００１８】[0018]
【表２】[Table 2]
【００１９】室温水中、３００℃飽和水中、および３０
０℃飽和蒸気中で表面粗さ１． ０μＲａ以下のものは
、■−■の組合せであることが確認された。１． ０μ
Ｒａの表面粗さは、弁座材として使用した場合、従来の
コバルト基合金の弁座材と同様のメインテナンスにて対
応可能な範囲のものである。[0019] Room temperature water, 300°C saturated water, and 30°C
Surface roughness in saturated steam at 0°C: 1. It was confirmed that those with 0 μRa or less were a combination of ■-■. 1. 0μ
The surface roughness of Ra is within a range that can be maintained with the same maintenance as conventional cobalt-based alloy valve seat materials when used as a valve seat material.
【００２０】次に、上記摩耗試験で結果の良好であった
合金■、■によって試験片を製作し、エロージョンおよ
び熱衝撃試験を実施した。エロージョン試験方法として
は、差圧２４０ｋｇ／ｃｍ２ の室温水を流量１０Ｌ／
ｍｉｎ（流速２１７ｍ／ｓ）で４０時間、試験片の表面
に擦過させ、そのときのエロージョンによる試験片の重
量減と最大侵食深さを求めた。また、熱衝撃試験方法と
しては、外径５５０ｍｍ、厚さ１００ｍｍの鋼板の表面
に外径５５０ｍｍ、内径４５０ｍｍ、厚さ３． ５ｍｍ
に合金をプラズマ粉体肉盛してなる試験体を電気炉で３
００℃に加熱した状態から室温水中に投入し、急冷する
方法をとった。結果を表３に示す。Next, test pieces were prepared using alloys (1) and (2) which had good results in the above wear test, and erosion and thermal shock tests were conducted. The erosion test method is to use room temperature water with a differential pressure of 240 kg/cm2 at a flow rate of 10 L/cm2.
The surface of the test piece was rubbed at a flow rate of 217 m/s for 40 hours, and the weight loss and maximum erosion depth of the test piece due to erosion at that time were determined. In addition, as a thermal shock test method, a steel plate with an outer diameter of 550 mm and an inner diameter of 450 mm and a thickness of 3. 5mm
A test specimen made by plasma powder overlaying of an alloy was heated in an electric furnace.
A method was used in which the sample was heated to 00°C and then poured into room temperature water to rapidly cool it. The results are shown in Table 3.
【００２１】[0021]
【表３】[Table 3]
【００２２】表３に示すように、合金■，■のエロージ
ョン量は実機の玉型弁の使用条件下で実用上十分な耐エ
ロージョン性があると判断できる。また、熱衝撃試験で
も合金■，■は８回の熱衝撃繰返しで異常がなかった。As shown in Table 3, the erosion amounts of alloys (1) and (2) can be judged to have sufficient erosion resistance for practical use under the conditions of use of actual globe valves. Further, in the thermal shock test, alloys (1) and (2) showed no abnormality after 8 thermal shock cycles.
【００２３】更に上記■，■の合金の一方を弁箱弁座、
他方を弁体弁座に用いて、図１に示す呼び径１００ｍｍ
，１５０ｍｍ，２５０ｍｍの仕切弁を製作し、開閉作動
試験及び気密性の試験を実施した。その結果を表４に示
す。Furthermore, one of the alloys (1) and (2) above was used as a valve box valve seat,
The other side is used as the valve body valve seat, and the nominal diameter is 100 mm as shown in Figure 1.
, 150mm, and 250mm gate valves were manufactured, and an opening/closing operation test and an airtightness test were conducted. The results are shown in Table 4.
【００２４】[0024]
【表４】[Table 4]
【００２５】合金■，■を用いた材料の実弁面圧を模擬
した摺動試験によっても、摺動性が良好であることがわ
かった。A sliding test simulating the actual valve surface pressure using alloys (1) and (2) revealed that the sliding properties were good.
【００２６】[0026]
【発明の効果】本発明による軽水原子炉用弁は、軽水原
子炉の直接原子炉に流入する配管に設置して使用する
ことにより、周辺機器の放射線量率を従来の約 １
／２以下におさえる事ができ（Ｃｏが炉水中に入らない
ことに基づく）、定期検査時の被曝を低減し作業時間を
大巾に確保でき、より安全な原子力プラントの実現に寄
与することが可能になる。[Effects of the Invention] The light water reactor valve according to the present invention is installed and used in a pipe that directly flows into the reactor of a light water reactor.
By doing so, the radiation dose rate of peripheral equipment can be reduced to approximately 1
/2 or less (based on the fact that Co does not enter the reactor water), reducing radiation exposure during periodic inspections and securing a large amount of work time, contributing to the realization of safer nuclear power plants. It becomes possible.
【図１】本発明の１実施例となる４インチ用仕切弁の断
面図である。FIG. 1 is a sectional view of a 4-inch gate valve according to an embodiment of the present invention.
１：ハンドル ２：ボンネット３：弁棒
４：弁箱５：弁体弁座
６：弁体７：弁箱弁座1: Handle 2: Bonnet 3: Valve stem 4: Valve box 5: Valve body valve seat
6: Valve body 7: Valve box valve seat
Claims (4)
の表面肉盛材として、夫々、Ｎｉ−Ｃｒ−Ｓｉ−Ｆｅ−
Ｗ系のＮｉ基合金であって互に化学組成および硬度の異
なる材料を用いたことを特徴とする耐摩耗性および耐エ
ロージョン性のコバルトフリー肉盛弁座材を有する軽水
原子炉用弁。Claim 1: Ni-Cr-Si-Fe-
A light water reactor valve having a wear-resistant and erosion-resistant cobalt-free built-up valve seat material, which is made of a W-based Ni-based alloy having different chemical compositions and hardnesses.
方の表面肉盛材をなすＮｉ基合金はＣｒ１０〜１５％，
Ｓｉ３〜７％，Ｆｅ１０％以下，Ｗ２〜４％及び残部Ｎ
ｉの化学組成からなり且つロックウェル硬度ＨＲＣが４
０〜５５であり、他方の表面肉盛材をなすＮｉ基合金は
Ｃｒ１５〜２０％，Ｓｉ５〜１０％，Ｆｅ１５％以下、
Ｗ１〜３％，Ｓｎ ０． ５〜１． ０％及び残部Ｎｉ
の化学組成からなり且つロックウェル硬度ＨＲＣが５０
〜６０であることを特徴とする請求項１記載の軽水原子
炉用弁。[Claim 2] One of the valve body valve seat portion and the valve body valve seat portion.
The Ni-based alloy that forms the surface welding material on the other hand contains 10 to 15% Cr,
Si 3-7%, Fe 10% or less, W 2-4% and balance N
It has a chemical composition of i and has a Rockwell hardness HRC of 4.
0 to 55, and the Ni-based alloy forming the other surface welding material has 15 to 20% Cr, 5 to 10% Si, 15% or less Fe,
W1-3%, Sn 0. 5-1. 0% and balance Ni
It has a chemical composition of and has a Rockwell hardness HRC of 50.
2. The light water reactor valve according to claim 1, wherein the valve is 60 to 60.
ｅ１０％以下，Ｗ２〜４％及び残部Ｎｉとした組成のＮ
ｉ基合金を弁体ガイド部に設けたことを特徴とする請求
項２記載の軽水原子炉用弁。[Claim 3] Cr10-15%, Si3-7%, F
N with a composition of e 10% or less, W 2 to 4%, and the balance Ni
3. The light water reactor valve according to claim 2, wherein the i-based alloy is provided in the valve body guide portion.
クスコーティングを施して弁座部の耐摩耗性を更に向上
させたことを特徴とする請求項１，２又は３記載の軽水
原子炉用弁。4. The light water reactor valve according to claim 1, wherein a ceramic coating is applied to the surface of the nickel-based alloy to further improve the wear resistance of the valve seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3608891A JP2637296B2 (en) | 1991-03-01 | 1991-03-01 | Light water reactor valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3608891A JP2637296B2 (en) | 1991-03-01 | 1991-03-01 | Light water reactor valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04276038A true JPH04276038A (en) | 1992-10-01 |
| JP2637296B2 JP2637296B2 (en) | 1997-08-06 |
Family
ID=12460001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3608891A Expired - Lifetime JP2637296B2 (en) | 1991-03-01 | 1991-03-01 | Light water reactor valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2637296B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112975084A (en) * | 2021-03-26 | 2021-06-18 | 苏州热工研究院有限公司 | Welding method for cobalt-free nickel-based alloy plasma surfacing for strengthening sealing surface of nuclear power valve |
-
1991
- 1991-03-01 JP JP3608891A patent/JP2637296B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112975084A (en) * | 2021-03-26 | 2021-06-18 | 苏州热工研究院有限公司 | Welding method for cobalt-free nickel-based alloy plasma surfacing for strengthening sealing surface of nuclear power valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2637296B2 (en) | 1997-08-06 |
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