JPH11319958A - Bent clad tube and its manufacture - Google Patents
Bent clad tube and its manufactureInfo
- Publication number
- JPH11319958A JPH11319958A JP10136222A JP13622298A JPH11319958A JP H11319958 A JPH11319958 A JP H11319958A JP 10136222 A JP10136222 A JP 10136222A JP 13622298 A JP13622298 A JP 13622298A JP H11319958 A JPH11319958 A JP H11319958A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- bent
- bending
- tube
- stainless steel
- 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- Withdrawn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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 14
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 abstract description 28
- 238000005452 bending Methods 0.000 abstract description 23
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 14
- 238000003825 pressing Methods 0.000 abstract description 5
- 238000000137 annealing Methods 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 230000006866 deterioration Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 238000013003 hot bending Methods 0.000 description 3
- 102220479482 Puromycin-sensitive aminopeptidase-like protein_C21D_mutation Human genes 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 102220023198 rs387907448 Human genes 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Landscapes
- Branch Pipes, Bends, And The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、曲がりクラッド管
およびその製造方法に関し、特に、原子力プラントで使
用される配管に対して適用すると有効である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent clad tube and a method for manufacturing the same, and is particularly effective when applied to piping used in a nuclear power plant.
【０００２】[0002]
【従来の技術】原子力プラントなどで使用される配管
は、内面に耐蝕性が特に要求されるため、低合金鋼の管
の内面にステンレス鋼を肉盛溶接したクラッド管が使用
されている。2. Description of the Related Art Since a pipe used in a nuclear power plant or the like is particularly required to have corrosion resistance on its inner surface, a clad tube obtained by overlay welding stainless steel on the inner surface of a low alloy steel tube is used.
【０００３】[0003]
【発明が解決しようとする課題】ところが、途中で曲折
した曲がりクラッド管を製造しようとする場合には、管
の形状が複雑なうえ、長尺であることから、汎用の装置
で肉盛溶接を行うことができないため、高価な専用装置
が必要となるばかりか、施工に手間が非常にかかってし
まい、製造コストが高くなってしまう。However, in the case of manufacturing a bent clad tube which is bent in the middle, since the shape of the tube is complicated and long, the overlay cladding is performed by a general-purpose device. Since it cannot be performed, not only an expensive dedicated device is required, but also labor is extremely required for construction, and the manufacturing cost is increased.
【０００４】このため、直管に肉盛溶接した後に熱間曲
げ加工することにより曲がりクラッド管を製造する方法
も考えられるが、熱間曲げ加工（９５０℃）を行うと、
肉盛溶接したステンレス鋼に加熱により炭化物が析出し
てしまい、耐蝕性が低下してしまうと共に、加熱時間が
長くなると、肉盛溶接したステンレス鋼に脆化相である
σ相が析出してしまい、曲げ加工中に割れを生じてしま
う場合がある。[0004] For this reason, a method of manufacturing a bent clad tube by overlay bending welding on a straight pipe and then hot bending is conceivable. However, when hot bending (950 ° C) is performed,
Carbide precipitates due to heating in the overlay welded stainless steel, which reduces the corrosion resistance, and when the heating time is prolonged, the σ phase, which is an embrittlement phase, precipitates in the overlay welded stainless steel. In some cases, cracks may occur during bending.
【０００５】そこで、熱間曲げ加工に代えて冷間曲げ加
工することにより上記問題を解決する方法も考えられる
が、管が大口径で厚肉になると、多大な加工力が必要で
あるため、容量の大きな機械を使用しなければならず、
加工に手間がかかってしまい、製造コストが高くなって
しまう。[0005] To solve the above-mentioned problem, it is conceivable to solve the above problem by performing cold bending instead of hot bending. However, if the pipe has a large diameter and is thick, a large processing force is required. You have to use a large capacity machine,
Processing is troublesome, and the manufacturing cost is increased.
【０００６】このようなことから、本発明は、低コスト
で簡単に製造できる高品質の曲がりクラッド管およびそ
の製造方法を提供することを目的とした。Accordingly, an object of the present invention is to provide a high-quality bent clad tube which can be easily manufactured at low cost and a method of manufacturing the same.
【０００７】[0007]
【課題を解決するための手段】前述した課題を解決する
ための、本発明による曲がりクラッド管は、ステンレス
鋼を内面に肉盛溶接された低合金鋼の直管が５５０〜６
５０℃の温度範囲で加熱されながら曲げ加工されたもの
であることを特徴とする。In order to solve the above-mentioned problems, a bent clad tube according to the present invention comprises a straight pipe made of a low-alloy steel having a built-up surface welded with stainless steel and having a thickness of 550-6 mm.
It is characterized by being bent while being heated in a temperature range of 50 ° C.
【０００８】前述した課題を解決するための、本発明に
よる曲がりクラッド管の製造方法は、低合金鋼の直管の
内面にステンレス鋼を肉盛溶接した後、当該管を５５０
〜６５０℃の温度範囲で加熱しながら曲げ加工を行うこ
とを特徴とする。[0008] In order to solve the above-mentioned problems, a method for manufacturing a bent clad tube according to the present invention comprises overlay welding stainless steel to the inner surface of a straight pipe made of a low alloy steel, and then welding the pipe to 550.
The bending process is performed while heating in a temperature range of up to 650 ° C.
【０００９】[0009]
【発明の実施の形態】本発明による曲がりクラッド管お
よびその製造方法の実施の形態を図１〜４を用いて説明
する。なお、図１は、その製造方法の手順を表すフロー
図、図２は、図１の工程２の実施に使用する製造装置の
概略構成図、図３は、クラッド管の加熱温度と変形抵抗
との関係を表すグラフ、図４は、クラッド管の加熱温度
および加熱時間と析出物との関係を表すグラフである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bent clad tube and a method of manufacturing the same according to the present invention will be described with reference to FIGS. FIG. 1 is a flow chart showing the procedure of the manufacturing method, FIG. 2 is a schematic configuration diagram of a manufacturing apparatus used to carry out step 2 in FIG. 1, and FIG. FIG. 4 is a graph showing the relationship between the heating temperature and the heating time of the clad tube and the precipitate.
【００１０】外径４０６ｍｍで板厚４１ｍｍの低合金鋼
（ＳＱＶ１Ａ）の直線型の管（直管）の内面にステンレ
ス鋼（ＳＵＳ３０９）の溶接棒を用いて肉盛溶接を行う
（図１の工程１）。溶接方法はＴＩＧ溶接であり、溶接
トーチをマニュプレータに搭載し、ウィービングを行い
ながら管の軸方向に移動させると共に管を回転させるこ
とにより、肉盛溶接を自動的に行うようにする。肉盛溶
接されたステンレス鋼の厚さは約５ｍｍである。Overlay welding is performed on the inner surface of a low-alloy steel (SQV1A) straight pipe (straight pipe) having an outer diameter of 406 mm and a thickness of 41 mm using a stainless steel (SUS309) welding rod (step in FIG. 1). 1). The welding method is TIG welding, in which a welding torch is mounted on a manipulator, and is moved in the axial direction of the pipe while weaving, and the pipe is rotated to automatically perform overlay welding. The thickness of the build-up welded stainless steel is about 5 mm.
【００１１】なお、溶接方法はＴＩＧ溶接に限らず、例
えば、溶着量の大きいサブマージアーク溶接などのよう
に常に下向き溶接しかできないような方法でも適用する
ことができる。また、フェライトを含有するオーステナ
イト系のステンレス鋼（二相ステンレス鋼）の溶接棒を
用いることにより、肉盛溶接時の高温割れを確実に防止
することができる。The welding method is not limited to TIG welding, but may be applied to a method in which only downward welding is always possible, such as submerged arc welding with a large welding amount. Further, by using a welding rod of austenitic stainless steel (duplex stainless steel) containing ferrite, it is possible to reliably prevent high-temperature cracking during overlay welding.
【００１２】次に、図２に示すように、内面に肉盛溶接
を施した直線型の管１０を支えロール１で支持し、当該
管１０の曲げ加工対象部分周辺を高周波加熱コイル２で
６００±２０℃に加熱し、当該管１０の一端を押し型３
で押しながら上記曲げ加工対象部分に曲げロール４を押
し付けることにより、当該管１０に曲げ加工を施す（図
１の工程２）。この曲げ半径は外径の２倍（８１２ｍ
ｍ）である。Next, as shown in FIG. 2, a straight pipe 10 whose inner surface is overlaid and welded is supported by a support roll 1, and the vicinity of a portion to be bent of the pipe 10 is subjected to a high-frequency heating coil 2 by a high-frequency heating coil 2. Heat to ± 20 ° C and press one end of the tube 10
The pipe 10 is bent by pressing the bending roll 4 against the bending target portion while pressing (step 2 in FIG. 1). This bending radius is twice the outer diameter (812 m
m).
【００１３】ここで、上記高周波加熱コイル２の両側に
は、上記管１０に冷却空気を吹き付ける図示しないエア
ノズルが設けられており、当該管１０の加熱範囲を１５
０ｍｍ程度に抑えるようにしている。このため、未加熱
部分の剛性により、変形を加熱部分のみに限定すること
ができるので、上記管１０の偏平を抑制することがで
き、また、曲げ加工部分に圧縮応力が作用するので、曲
げ加工部分の減肉を防止することができることから、曲
がり管の要求スペック（減肉率：１２．５％以下，偏平
率：６％以下）を満たすことができる。Here, on both sides of the high-frequency heating coil 2, air nozzles (not shown) for blowing cooling air to the tube 10 are provided.
It is controlled to be about 0 mm. For this reason, the deformation of the tube 10 can be limited only to the heated portion by the rigidity of the unheated portion, so that the flatness of the tube 10 can be suppressed. Since the thinning of the portion can be prevented, the required specifications of the bent pipe (thinning rate: 12.5% or less, flattening rate: 6% or less) can be satisfied.
【００１４】また、加熱温度を６００±２０℃とする
と、図３に示すように、加工部分の変形抵抗を室温の約
１／２にまで減少させることができ、容量の小さい機械
でも容易に加工することができる。さらに、加熱時間を
短時間で済ますことができるので、図４に示すように、
ステンレス鋼における炭化物の析出による耐蝕性低下や
脆化を生じるσ相の析出による伸びの低下や４５７℃脆
化を防止することができ、材料劣化を引き起こすことが
ほとんどない。If the heating temperature is set at 600 ± 20 ° C., as shown in FIG. 3, the deformation resistance of the processed portion can be reduced to about の of the room temperature, so that even a machine having a small capacity can be easily processed. can do. Further, since the heating time can be reduced in a short time, as shown in FIG.
It is possible to prevent a decrease in elongation and a 457 ° C. embrittlement due to precipitation of σ phase that causes deterioration of corrosion resistance and embrittlement due to precipitation of carbides in stainless steel, and hardly causes deterioration of the material.
【００１５】また、曲げ加工は、曲がり管の要求スペッ
クを満たす加工条件で成形する限り、プレス加工や引き
曲げ加工など各種の方法を適用することができる。この
ような各種の曲げ加工方法を適用する際には、曲げ加工
部分だけに限らず全体を加熱する場合もあり得るが、加
熱温度が６００±２０℃であれば、材料劣化を引き起こ
すことなく容易に曲げ加工を施すことができる。As for the bending process, various methods such as press working and pull-bending can be applied as long as the forming is performed under processing conditions satisfying the required specifications of the bent pipe. When such various bending methods are applied, not only the bent part but also the whole may be heated, but if the heating temperature is 600 ± 20 ° C., the material can be easily heated without causing material deterioration. Can be bent.
【００１６】上述したように曲げ加工を施したら、全体
にわたって応力除去焼鈍（６３０℃×３ｈ）する（図１
の工程３）ことにより、曲がりクラッド管を得ることが
できる。After bending as described above, stress relief annealing (630 ° C. × 3 h) is performed over the entirety (FIG. 1).
By performing step 3), a bent clad tube can be obtained.
【００１７】なお、本実施の形態では、応力除去焼鈍温
度（最終熱処理温度）を６３０℃としているため、曲げ
加工時の加熱温度範囲を６００±２０℃としたが、最終
熱処理温度等の条件で特に制限されなければ、曲げ加工
時の加熱温度範囲が６００±５０℃であれば、材料劣化
を引き起こすことなく容易に曲げ加工を施すことができ
る。In this embodiment, since the stress relieving annealing temperature (final heat treatment temperature) is 630 ° C., the heating temperature range during bending is 600 ± 20 ° C. Unless particularly limited, if the heating temperature range during bending is 600 ± 50 ° C., bending can be easily performed without causing material deterioration.
【００１８】このようにして得られた曲がりクラッド管
に対して、超音波探傷試験および浸透短小試験を行った
ところ、欠陥を生じていないことが確認できた。また、
断面のミクロ組織を観察したところ、肉盛溶接部分の表
面近傍に炭化物などが見られず、良好な組織を保持して
いることが確認できた。The bent clad tube obtained as described above was subjected to an ultrasonic flaw detection test and a penetration shortness test, and it was confirmed that no defect was generated. Also,
Observation of the microstructure of the cross section confirmed that carbides and the like were not observed near the surface of the overlay welding portion, and that a good structure was maintained.
【００１９】したがって、このような曲がりクラッド管
およびその製造方法によれば、次のような効果を得るこ
とができる。Therefore, according to such a bent clad tube and its manufacturing method, the following effects can be obtained.
【００２０】直管に肉盛溶接を行うため、簡単な装置
で安価に行うことができる。 フェライトを含有するオーステナイト系ステンレス鋼
（二相ステンレス鋼）を溶接金属に用いるので、肉盛溶
接時の熱間割れを防止することができる。 曲げ加工を５５０〜６５０℃の温度範囲で行うことに
より、材料の変形抵抗を室温の約１／２とすることがで
きるので、成形力を室温の約１／２に抑えることがで
き、小さい容量の機械でも曲げ加工することができる。 曲げ加工を５５０〜６５０℃の温度範囲で行うので、
材料に冶金的な脆化が発生せず、加工時の割れや材質の
劣化を防止することができる。 低合金鋼の内面にオーステナイト系ステンレス鋼を肉
盛溶接しているため、耐蝕性および耐熱性を維持したま
ま材料費を低減することができ、高品質な曲がりクラッ
ド管を得ることができる。Since the overlay welding is performed on the straight pipe, it can be performed at a low cost with a simple apparatus. Since austenitic stainless steel (duplex stainless steel) containing ferrite is used as the weld metal, hot cracking during overlay welding can be prevented. By performing the bending in the temperature range of 550 to 650 ° C., the deformation resistance of the material can be reduced to about １ ／ of the room temperature, so that the forming force can be suppressed to about の of the room temperature and the small capacity can be obtained. Can also be bent with the machine. Since the bending is performed in the temperature range of 550 to 650 ° C,
Metallurgical embrittlement does not occur in the material, and cracking and deterioration of the material during processing can be prevented. Since the austenitic stainless steel is overlay-welded to the inner surface of the low-alloy steel, the material cost can be reduced while maintaining corrosion resistance and heat resistance, and a high-quality bent clad tube can be obtained.
【００２１】[0021]
【発明の効果】本発明による曲がりクラッド管は、ステ
ンレス鋼を内面に肉盛溶接された低合金鋼の直管が５５
０〜６５０℃の温度範囲で加熱されながら曲げ加工され
たものであり、また、本発明による曲がりクラッド管の
製造方法は、低合金鋼の直管の内面にステンレス鋼を肉
盛溶接した後、当該管を５５０〜６５０℃の温度範囲で
加熱しながら曲げ加工を行うことから、直管に肉盛溶
接を行うため、簡単な装置で安価に行うことができ、
曲げ加工を５５０〜６５０℃の温度範囲で行うことによ
り、材料の変形抵抗を室温の約１／２とすることができ
るので、成形力を室温の約１／２に抑えることができ、
小さい容量の機械でも曲げ加工することができ、曲げ
加工を５５０〜６５０℃の温度範囲で行うので、材料に
冶金的な脆化が発生せず、加工時の割れや材質の劣化を
防止することができ、その結果、低コストで簡単に製
造できる高品質の曲がりクラッド管およびその製造方法
を提供することができた。The bent clad tube according to the present invention has a straight pipe of low alloy steel in which a stainless steel is weld-welded to the inner surface by 55%.
It is bent while being heated in a temperature range of 0 to 650 ° C., and the method of manufacturing a bent clad tube according to the present invention is such that after overlay welding of stainless steel to the inner surface of a straight pipe of low alloy steel, Since the pipe is bent while being heated in a temperature range of 550 to 650 ° C., since the overlay welding is performed on the straight pipe, it can be performed at a low cost with a simple apparatus.
By performing the bending in the temperature range of 550 to 650 ° C., the deformation resistance of the material can be reduced to about の of the room temperature, so that the forming force can be suppressed to about の of the room temperature,
Bending can be performed even with a machine with a small capacity, and bending is performed in a temperature range of 550 to 650 ° C., so metallurgical embrittlement does not occur in the material, and cracking and deterioration of the material during processing are prevented. As a result, a high-quality bent clad tube that can be easily manufactured at low cost and a method for manufacturing the same can be provided.
【図１】本発明による曲がりクラッド管の製造方法の実
施の形態の手順を表すフロー図である。FIG. 1 is a flowchart showing a procedure of an embodiment of a method for manufacturing a bent clad tube according to the present invention.
【図２】図１の工程２の実施に使用する製造装置の概略
構成図である。FIG. 2 is a schematic configuration diagram of a manufacturing apparatus used for performing step 2 of FIG.
【図３】クラッド管の加熱温度と変形抵抗との関係を表
すグラフである。FIG. 3 is a graph showing a relationship between a heating temperature of a clad tube and a deformation resistance.
【図４】クラッド管の加熱温度および加熱時間と析出物
との関係を表すグラフである。FIG. 4 is a graph showing a relationship between a heating temperature and a heating time of a cladding tube and a precipitate.
１ 支えロール ２ 高周波加熱コイル ３ 押し型 ４ 曲げロール １０ 管 DESCRIPTION OF SYMBOLS 1 Support roll 2 High frequency heating coil 3 Press type 4 Bending roll 10 pipe
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｇ２１Ｄ 1/00 Ｃ２１Ｄ 9/50 １０１Ｂ // Ｃ２１Ｄ 9/50 １０１ Ｇ２１Ｄ 1/00 Ｗ (72)発明者 山崎 正人 兵庫県神戸市兵庫区和田崎町一丁目１番１ 号 三菱重工業株式会社神戸造船所内 (72)発明者 佐藤 礼基 兵庫県神戸市兵庫区和田崎町一丁目１番１ 号 三菱重工業株式会社神戸造船所内──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FIG21D 1/00 C21D 9/50 101B // C21D 9/50 101 G21D 1/00 W (72) Inventor Masato Yamazaki Kobe, Hyogo 1-1-1 Wadazakicho, Hyogo-ku Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Reiki Sato 1-1-1, Wadasakicho, Hyogo-ku, Kobe, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd.Kobe Shipyard
Claims (2)
合金鋼の直管が５５０〜６５０℃の温度範囲で加熱され
ながら曲げ加工されたものであることを特徴とする曲が
りクラッド管。1. A bent clad tube characterized in that a straight pipe of low alloy steel in which stainless steel is build-up welded to the inner surface is bent while being heated in a temperature range of 550 to 650 ° C.
肉盛溶接した後、当該管を５５０〜６５０℃の温度範囲
で加熱しながら曲げ加工を行うことを特徴とする曲がり
クラッド管の製造方法。2. A bent clad tube characterized in that after a stainless steel is build-up welded on the inner surface of a low alloy steel straight pipe, the pipe is bent while being heated in a temperature range of 550 to 650 ° C. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10136222A JPH11319958A (en) | 1998-05-19 | 1998-05-19 | Bent clad tube and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10136222A JPH11319958A (en) | 1998-05-19 | 1998-05-19 | Bent clad tube and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11319958A true JPH11319958A (en) | 1999-11-24 |
Family
ID=15170159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10136222A Withdrawn JPH11319958A (en) | 1998-05-19 | 1998-05-19 | Bent clad tube and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11319958A (en) |
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