WO2015029095A1 - Method and apparatus for heat-treating welded structure - Google Patents

Method and apparatus for heat-treating welded structure Download PDF

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Publication number
WO2015029095A1
WO2015029095A1 PCT/JP2013/072643 JP2013072643W WO2015029095A1 WO 2015029095 A1 WO2015029095 A1 WO 2015029095A1 JP 2013072643 W JP2013072643 W JP 2013072643W WO 2015029095 A1 WO2015029095 A1 WO 2015029095A1
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region
temperature
heating device
heat treatment
heating
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PCT/JP2013/072643
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French (fr)
Japanese (ja)
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スリョノ チュン
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株式会社日立製作所
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Priority to PCT/JP2013/072643 priority Critical patent/WO2015029095A1/en
Priority to JP2015533786A priority patent/JPWO2015029095A1/en
Publication of WO2015029095A1 publication Critical patent/WO2015029095A1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • C21D9/505—Cooling thereof
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a heat treatment of a welded structure, and relates to a heat treatment method and apparatus for improving a tensile residual stress in a base material near a weld.
  • Japanese Patent Laid-Open No. 61-170517 discloses a method for improving the tensile residual stress due to welding.
  • a coolant is present inside the welded structure, the outer surface is heated to generate a temperature difference between the inner surface and the outer surface, the inner surface is tensile yielded, and the outer surface is compressed.
  • a heat treatment method for yielding a welded structure is characterized in that the welded portion is heated locally by a heating element to improve the partial stress, and the stress improved portion is continued to improve the stress of the entire welded portion. A heat treatment method is described.
  • the above-mentioned heat treatment method can reduce the tensile residual stress of the welded portion, but since a steep temperature is generated near the end of the heating device, tensile residual stress is generated in the base material portion.
  • tensile residual stress is generated in the base material portion.
  • it has a coolant inside, it is possible to improve the tensile residual stress on the inner surface, but tensile residual stress is generated on the outer surface of the structure, making it difficult to improve the tensile residual stress on the base material surface. It is.
  • an object of the present invention is to provide a heat treatment method and apparatus for reducing the tensile residual stress in the welded part and reducing the tensile residual stress generated in the base material part.
  • the present invention provides a heating device in a first region which is a welded portion of a welded structure and a second region which is a base material portion, and heats the first region to a first temperature. And heating the second region to a second temperature lower than the first temperature, holding the first and second temperatures for a certain period of time, and then cooling the first and second regions of the welded structure.
  • FIG. 1 is a configuration diagram of a heat treatment apparatus used in Example 1.
  • FIG. It is a block diagram of the heat processing apparatus used in Example 2.
  • FIG. It is a block diagram of the heat processing apparatus used in Example 3.
  • FIG. It is a block diagram of the heat processing apparatus used in Example 4.
  • FIG. 3 is a temperature distribution calculated according to Examples 1 and 3. It is the circumferential residual direction stress calculated by Examples 1 and 3. 3 is a temperature distribution calculated according to Examples 2 and 4. It is the circumferential residual direction stress calculated according to Examples 2 and 4. It is a graph of the starting and stop time of each heating apparatus of Example 3. It is a graph of the starting and stop time of each heating apparatus of Example 4.
  • FIG. 1 is a configuration diagram of a heat treatment apparatus for a welded structure in the present embodiment.
  • the welded pipe is a construction target.
  • the welded structure shown in the figure is a sectional view of the piping.
  • One heating device 10 is installed over the circumferential direction of the welded part 1 and the base material parts 2 and 3 of the welded structure.
  • a control device 20 is connected to the heating device 10, and this control device performs temperature control and heating time control as described in the following embodiments.
  • a heating device may be provided on the inner surface. In this case, the heating time is shortened, and improvement in work efficiency can be expected.
  • the heating device in this embodiment includes a high frequency induction heating coil, an electric heater, and the like.
  • a high frequency induction heating coil When using a high frequency induction heating coil, the number of turns of the coil is changed so that the base metal parts 2 and 3 can be further heated to TC / 2 which is the set temperature so that the welded part 1 can be heated to TC which is the set temperature. ing.
  • a current is passed through the high frequency induction heating coil, and the region wound by the coil is heated. Each heating region is heated until reaching a predetermined set temperature TC or TC / 2, which is set from room temperature, and then constant so that each heating region of the welded structure becomes uniform at a predetermined set temperature. Hold for hours. Finally, the current is turned off, and the heating area of the welded structure is cooled from a predetermined set temperature to room temperature.
  • the electric heater When using an electric heater, the electric heater is installed over the welded part 1 and the base metal parts 2 and 3 of the welded structure in the circumferential direction.
  • the heating device sets the temperature to TC in the welded portion 1 and sets the temperature to TC / 2 in the base material portions 2 and 3. Then start the electric heater.
  • the welded portion 1 and the base metal portions 2 and 3 are heated from room temperature to a predetermined set temperature TC or TC / 2, respectively. Thereby, a moderate temperature gradient is obtained in the welded structure, and the heating region of the welded structure is held for a certain period of time so as to be uniform at the set temperature.
  • the welded structure is cooled from a predetermined set temperature to room temperature. Air cooling was used for cooling.
  • FIG. 5 shows the temperature distribution when the temperature TC of the welded part 1 is set to 680 ° C., the temperature of the central part of the base metal parts 2 and 3 is set to 340 ° C., and the predetermined set temperature is reached. ing.
  • the temperature in the environment where the welded structure is placed for example, room temperature.
  • a temperature distribution in which the base materials 2 and 3 are not heated is also shown in FIG.
  • the vertical axis represents the temperature distribution on the surface of the structure. From FIG. 5, when the base metal parts 2 and 3 are not heated, a steep temperature gradient occurs in the welded part 1 and the base metal parts 2 and 3. On the other hand, when the base materials 2 and 3 are heated, the temperature gradient becomes gentle.
  • Fig. 6 shows the distribution of residual stress in the circumferential direction of the pipe outer surface when the heat treatment is completed.
  • 0 mm is the welding center.
  • the vertical axis is the circumferential residual stress.
  • a tensile residual stress of about 200 MPa is generated at the end of the heating device.
  • the tensile residual stress is about 100 MPa, which is approximately half.
  • a simulation result when the inner surface is water-cooled is also described.
  • tensile residual stress is also generated in the base material portion on the outer surface of the pipe. This is because a compressive residual stress is generated on the inner surface due to a temperature difference between the inner and outer surfaces, but a tensile residual stress is generated on the outer surface in proportion thereto.
  • the base metal parts 2 and 3 are subjected to heat treatment with a gentle temperature gradient, thereby reducing the tensile residual stress in the welded part and reducing the tensile residual stress generated in the base metal part. This makes it possible to prevent fatigue of the welded structure.
  • Example 2 of the present invention will be described with reference to FIG.
  • the heat treatment apparatus used in this example is different from the apparatus configuration of Example 1 in that a heating region provided with a temperature gradient is added to the regions of the base materials 4 and 5.
  • FIG. 2 shows a configuration diagram of a heat treatment apparatus used in this embodiment.
  • the set temperature of the heating device is set to TC in the welded portion 1, set to about 2TC / 3 in the regions of the base metal portions 2 and 3, and set to about TC / 3 in the regions of the base metal portions 4 and 5.
  • Each heating region is heated to a predetermined set temperature by starting the heating device. At this time, a gentler temperature gradient is obtained in the welded structure than in Example 1.
  • the welded part 1 and the base metal parts 2 to 5 are held at a predetermined set temperature for a predetermined time. Thereby, each heating region of the welded structure is uniformly heated to a predetermined set temperature.
  • the heating device is stopped and the welded structure is cooled from a predetermined set temperature to room temperature.
  • the heating device 10 changes the number of turns of the coil or changes the set temperature in each region of the welded part 1, the base material parts 2 and 3, and the base material parts 4 and 5.
  • the temperature TC of the weld 1 is set to 680 ° C.
  • the temperatures of the base materials 2 and 3 are set to 440 ° C.
  • the base materials 4 and 5 are set to 220 ° C.
  • the temperature distribution when a predetermined set temperature is reached is shown.
  • the temperature distribution of Example 1 is also shown in FIG. On the horizontal axis of the graph, 0 mm is the center of welding. The vertical axis is the temperature distribution. From FIG. 7, when the base material parts 4 and 5 were heated, the temperature gradient of the base material part was further gentler than that of Example 1.
  • Fig. 8 shows the circumferential stress on the outer surface of the pipe after the heat treatment.
  • a tensile residual stress of about 200 MPa is generated in the base material part.
  • the tensile residual stress was about 50 MPa, and was reduced to about 1/4.
  • a simulation result when the inner surface is water-cooled is also described. When the inner surface is cooled, it can be seen that tensile residual stress is also generated in the base material portion on the outer surface of the pipe.
  • the temperature gradient As in the present invention, by making the temperature gradient more gentle, it becomes possible to reduce the tensile residual stress in the welded part and further reduce the tensile residual stress generated in the base material part. Prevent fatigue.
  • Example 3 of the present invention will be described with reference to FIG.
  • FIG. 3 shows a configuration diagram of the heat treatment apparatus used in this embodiment.
  • the first heating device 11 is installed in the circumferential direction of the welded portion 1 of the welded structure, and then the second heating device 12 and the third heating device 13 are installed in the circumferential direction of the base materials 2 and 3. To do.
  • heat treatment is performed using three heating devices.
  • FIG. 9 shows a graph of the start and stop times of the heating device of this example.
  • the first heating device 11 is activated, and the second heating device 12 and the third heating device 13 are activated after a lapse of time.
  • the welded part 1 and the base metal parts 2 and 3 are heated to a predetermined temperature TC or TC / 2, respectively, and then held for a certain period of time so that the temperature of the heating region becomes uniform.
  • the first heating device 11 is stopped, and when the temperature of the welded portion 1 reaches TC / 2, the second heating device 12 and the third heating device 13 are stopped. Finally, the welded structure is cooled to room temperature.
  • the temperature of the welded portion 1 is increased by the start and stop of the time difference between the first heating device 11, the second heating device 12, and the third heating device 13, and the temperature of the base metal portions 2 and 3 is lowered, thereby being moderate.
  • a temperature gradient can be obtained, the tensile residual stress in the welded portion can be reduced, and the tensile residual stress generated in the base metal portion can be reduced, thereby preventing fatigue of the welded structure.
  • FIG. 4 shows a configuration diagram of the heat treatment apparatus used in this embodiment.
  • a fourth heating device 14 is installed in the base material portion 4 and a fifth heating device 15 is installed in the base material portion 5 in addition to those described in the third embodiment.
  • post-weld heat treatment is performed using five heating devices.
  • a graph of the start and stop times of the heating device of this example will be described with reference to FIG. After installing all the heating devices, the first heating device 11 is activated, and the second heating device 12 and the third heating device 13 are activated after a lapse of time. After further elapse of time, the fourth heating device 14 and the fifth heating device 15 are started.
  • Welded portion 1 base material portions 2 and 3 and base material portions 4 and 5 are heated to a predetermined temperature TC, 2TC / 3, or TC / 3, respectively, and then held for a certain period of time so that the temperature in the heating region becomes uniform. . Then, the 1st heating apparatus 11 is stopped, and if the temperature of the welding part 1 reaches 2TC / 3, the 2nd heating apparatus 12 and the 3rd heating apparatus 13 will be stopped, and the welding part 1, the base material parts 2 and 3 will be After reaching TC / 3, the fourth heating device 14 and the fifth heating device 15 are stopped. Finally, the entire welded structure is cooled to room temperature.

Abstract

　The purpose of the present invention is to provide a method and an apparatus for performing a heat treatment allowing tensile residual stress to be reduced in a welded portion, and tensile residual stress generated in a parent material portion to be reduced. In order to solve the above problem, the present invention is characterized in that a heating device is installed in each of a first region and a second region; the first region being a welded portion of a welded structure, and the second region being a parent material portion; the first region is heated to a first temperature and the second region is heated to a second temperature that is lower than the first temperature; the first and second temperatures are held for a certain period of time; and the first and second region in the welded structure are then cooled.

Description

溶接構造物の熱処理方法および装置Heat treatment method and apparatus for welded structure
　本発明は、溶接構造物の熱処理に関し、溶接部付近の母材における引張残留応力を改善する熱処理方法および装置に関する。 The present invention relates to a heat treatment of a welded structure, and relates to a heat treatment method and apparatus for improving a tensile residual stress in a base material near a weld.
　構造物を溶接した場合、溶接部では局部的に高温となり、熱膨張が発生する。この熱膨張は、その溶接周囲の低温の材料によって妨げられるため、溶接後の構造物内には引張残留応力が発生する。 溶 接 When a structure is welded, the welded portion becomes locally hot and thermal expansion occurs. Since this thermal expansion is hindered by the low-temperature material around the weld, tensile residual stress is generated in the structure after welding.
　溶接による引張残留応力を改善する方法として特開昭６１－１７０５１７号公報がある。この公報には、溶接構造物の熱処理方法において、溶接構造物の内部に冷却材を存在させ、外面を加熱して内面と外面の間に温度差を発生させ、内面を引張降伏させ外面を圧縮降伏させる熱処理法において、加熱体により溶接部を局所的に加熱して部分的な応力改善をはかり、応力改善部分を連続させて全溶接部の応力改善をはかることを特徴とする溶接構造物の熱処理法が記載されている。 Japanese Patent Laid-Open No. 61-170517 discloses a method for improving the tensile residual stress due to welding. In this publication, in a heat treatment method for a welded structure, a coolant is present inside the welded structure, the outer surface is heated to generate a temperature difference between the inner surface and the outer surface, the inner surface is tensile yielded, and the outer surface is compressed. In a heat treatment method for yielding, a welded structure is characterized in that the welded portion is heated locally by a heating element to improve the partial stress, and the stress improved portion is continued to improve the stress of the entire welded portion. A heat treatment method is described.
特開昭６１－１７０５１７号公報JP-A 61-170517
　前述の熱処理法では、溶接部の引張残留応力を低減させることは可能だが、加熱装置の端部付近では温度の急勾配が発生しているため、母材部には引張残留応力が発生する。また、内部に冷却材を有するため、内面においては引張残留応力の改善が図れるが、構造物の外面においては、引張残留応力が発生し、母材部表面の引張残留応力を改善することは困難である。 The above-mentioned heat treatment method can reduce the tensile residual stress of the welded portion, but since a steep temperature is generated near the end of the heating device, tensile residual stress is generated in the base material portion. In addition, because it has a coolant inside, it is possible to improve the tensile residual stress on the inner surface, but tensile residual stress is generated on the outer surface of the structure, making it difficult to improve the tensile residual stress on the base material surface. It is.
　そこで、本発明は、溶接部の引張残留応力を低減させ、且つ、母材部に発生した引張残留応力を低減する熱処理方法および装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a heat treatment method and apparatus for reducing the tensile residual stress in the welded part and reducing the tensile residual stress generated in the base material part.
　上記の課題を解決するために、本発明は、溶接構造物の溶接部である第一領域および母材部である第二領域に加熱装置を設置し、前記第一領域を第一温度に加熱し、前記第二領域を前記第一温度より低い第二温度に加熱し、前記第一及び第二温度を一定時間保持し、その後、溶接構造物の第一及び第二領域を冷却させることを特徴とした。 In order to solve the above problems, the present invention provides a heating device in a first region which is a welded portion of a welded structure and a second region which is a base material portion, and heats the first region to a first temperature. And heating the second region to a second temperature lower than the first temperature, holding the first and second temperatures for a certain period of time, and then cooling the first and second regions of the welded structure. Features.
　本発明によれば、溶接部の引張残留応力を低減させ、且つ、母材部に発生した引張残留応力を低減することが可能である。 According to the present invention, it is possible to reduce the tensile residual stress of the welded portion and reduce the tensile residual stress generated in the base material portion.
実施例１で用いた熱処理装置の構成図である。1 is a configuration diagram of a heat treatment apparatus used in Example 1. FIG. 実施例２で用いた熱処理装置の構成図である。It is a block diagram of the heat processing apparatus used in Example 2. FIG. 実施例３で用いた熱処理装置の構成図である。It is a block diagram of the heat processing apparatus used in Example 3. FIG. 実施例４で用いた熱処理装置の構成図である。It is a block diagram of the heat processing apparatus used in Example 4. FIG. 実施例１および３により算出した温度分布である。3 is a temperature distribution calculated according to Examples 1 and 3. 実施例１および３により算出した周方残留向応力である。It is the circumferential residual direction stress calculated by Examples 1 and 3. 実施例２および４により算出した温度分布である。3 is a temperature distribution calculated according to Examples 2 and 4. 実施例２および４により算出した周方残留向応力である。It is the circumferential residual direction stress calculated according to Examples 2 and 4. 実施例３のそれぞれの加熱装置の起動および停止時間のグラフである。It is a graph of the starting and stop time of each heating apparatus of Example 3. 実施例４のそれぞれの加熱装置の起動および停止時間のグラフである。It is a graph of the starting and stop time of each heating apparatus of Example 4.
　以下、図面を用いて本発明の実施例について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　本発明の実施例１について図１を用いて説明する。図１は、本実施例における溶接構造物の熱処理装置の構成図である。本実施例では溶接配管を施工対象としている。なお図の溶接構造物には配管の断面図を示した。 Example 1 of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of a heat treatment apparatus for a welded structure in the present embodiment. In this embodiment, the welded pipe is a construction target. The welded structure shown in the figure is a sectional view of the piping.
　溶接構造物の溶接部１および母材部２および３の周方向にわたり１個の加熱装置１０を設置する。加熱装置１０には制御装置２０が接続されており、この制御装置では、以下の各実施例で説明するように温度制御や加熱時間制御を行なう。また、内面に加熱装置を設けてもよい。この場合には加熱時間が短くなり、作業効率向上が望める。 One heating device 10 is installed over the circumferential direction of the welded part 1 and the base material parts 2 and 3 of the welded structure. A control device 20 is connected to the heating device 10, and this control device performs temperature control and heating time control as described in the following embodiments. A heating device may be provided on the inner surface. In this case, the heating time is shortened, and improvement in work efficiency can be expected.
　本実施例における加熱装置としては、高周波誘導加熱コイル、電気ヒーターなどがある。高周波誘導加熱コイルを用いる場合、溶接部１を設定温度であるＴＣまで加熱できるように、さらに母材部２および３を設定温度であるＴＣ／２まで加熱できるようにコイルの巻き数を変化させている。その後、高周波誘導加熱コイルに電流を流し、コイルで巻かれる領域が加熱される。それぞれの加熱領域は室温から設定された所定の設定温度であるＴＣまたはＴＣ／２に到達するまで加熱し、その後、溶接構造物のそれぞれの加熱領域が所定の設定温度に均一になるように一定時間保持する。最後に、電流を切り、溶接構造物の加熱領域が所定の設定温度から室温まで冷却される。 The heating device in this embodiment includes a high frequency induction heating coil, an electric heater, and the like. When using a high frequency induction heating coil, the number of turns of the coil is changed so that the base metal parts 2 and 3 can be further heated to TC / 2 which is the set temperature so that the welded part 1 can be heated to TC which is the set temperature. ing. Thereafter, a current is passed through the high frequency induction heating coil, and the region wound by the coil is heated. Each heating region is heated until reaching a predetermined set temperature TC or TC / 2, which is set from room temperature, and then constant so that each heating region of the welded structure becomes uniform at a predetermined set temperature. Hold for hours. Finally, the current is turned off, and the heating area of the welded structure is cooled from a predetermined set temperature to room temperature.
　電気ヒーターを用いる場合、溶接構造物の溶接部１および母材部２および３を周方向にわたり電気ヒーターを設置する。そして、加熱装置は溶接部１において温度をＴＣに設定し、母材部２、３においては温度をＴＣ/２に設定する。その後、電気ヒーターを起動する。電気ヒーターを起動することにより、溶接部１および母材部２および３をそれぞれ室温から所定の設定温度ＴＣまたはＴＣ／２まで加熱を行う。これにより、溶接構造物には緩やかな温度勾配が得られ、溶接構造物の加熱領域がそれぞれ設定温度に均一になるように一定時間保持する。最後に、加熱装置を停止することにより、溶接構造物が所定の設定温度から室温に冷却される。冷却には空冷を用いた。 When using an electric heater, the electric heater is installed over the welded part 1 and the base metal parts 2 and 3 of the welded structure in the circumferential direction. The heating device sets the temperature to TC in the welded portion 1 and sets the temperature to TC / 2 in the base material portions 2 and 3. Then start the electric heater. By starting the electric heater, the welded portion 1 and the base metal portions 2 and 3 are heated from room temperature to a predetermined set temperature TC or TC / 2, respectively. Thereby, a moderate temperature gradient is obtained in the welded structure, and the heating region of the welded structure is held for a certain period of time so as to be uniform at the set temperature. Finally, by stopping the heating device, the welded structure is cooled from a predetermined set temperature to room temperature. Air cooling was used for cooling.
　以上の溶接構造物の熱処理方法を外径３１８．５ｍｍ、厚さが２１．４ｍｍ、長さ６００ｍｍの低合金鋼配管の溶接部に適用したときの配管外面の温度分布および残留応力分布をコンピューターシミュレーションにより算出した結果を図５および図６に示す。 Computer simulation of temperature distribution and residual stress distribution on the outer surface of the pipe when the above heat treatment method for welded structures is applied to a weld of a low alloy steel pipe having an outer diameter of 318.5 mm, a thickness of 21.4 mm, and a length of 600 mm The results calculated by the above are shown in FIG. 5 and FIG.
　図５に、それぞれ溶接部１の温度ＴＣを６８０℃に設定し、母材部２および３の中心部の温度を３４０℃に設定し、その所定の設定温度に達した際の温度分布を示している。加熱の影響が無い母材部では、溶接構造物の置かれている環境中の温度（例えば室温）となっている。比較のため、母材部２および３を加熱していない温度分布も図５に示す。グラフの横軸で０ｍｍは溶接中央である。縦軸は構造物の表面における温度分布である。図５より、母材部２および３を加熱していない場合、溶接部１と母材部２および３に温度の急勾配が発生する。一方、母材部２および３を加熱している場合、温度の勾配が緩やかになる。 FIG. 5 shows the temperature distribution when the temperature TC of the welded part 1 is set to 680 ° C., the temperature of the central part of the base metal parts 2 and 3 is set to 340 ° C., and the predetermined set temperature is reached. ing. In the base material part which is not affected by heating, the temperature in the environment where the welded structure is placed (for example, room temperature). For comparison, a temperature distribution in which the base materials 2 and 3 are not heated is also shown in FIG. On the horizontal axis of the graph, 0 mm is the center of welding. The vertical axis represents the temperature distribution on the surface of the structure. From FIG. 5, when the base metal parts 2 and 3 are not heated, a steep temperature gradient occurs in the welded part 1 and the base metal parts 2 and 3. On the other hand, when the base materials 2 and 3 are heated, the temperature gradient becomes gentle.
　図６に熱処理が終了時の配管外面の周方向残留応力分布を示す。グラフの横軸で０ｍｍが溶接中央である。縦軸が周方向残留応力である。周方向残留応力において、母材部２および３を加熱していない場合、加熱装置の端部に２００ＭＰａ程度の引張残留応力が発生している。一方、母材部２および３を加熱した場合、引張残留応力は１００ＭＰａ程度であり、おおよそ半分となる。また、比較のために内面を水冷した場合のシミュレーション結果も記載する。内面を冷却した場合には、配管外面においては母材部でも引張残留応力が発生していることが分かる。これは、内外面の温度差により、内面には圧縮残留応力が発生するが、それに釣り合うように外面には引張残留応力が発生するためである。 Fig. 6 shows the distribution of residual stress in the circumferential direction of the pipe outer surface when the heat treatment is completed. On the horizontal axis of the graph, 0 mm is the welding center. The vertical axis is the circumferential residual stress. When the base metal parts 2 and 3 are not heated in the circumferential residual stress, a tensile residual stress of about 200 MPa is generated at the end of the heating device. On the other hand, when the base materials 2 and 3 are heated, the tensile residual stress is about 100 MPa, which is approximately half. For comparison, a simulation result when the inner surface is water-cooled is also described. When the inner surface is cooled, it can be seen that tensile residual stress is also generated in the base material portion on the outer surface of the pipe. This is because a compressive residual stress is generated on the inner surface due to a temperature difference between the inner and outer surfaces, but a tensile residual stress is generated on the outer surface in proportion thereto.
　以上、本発明のように、母材部２および３に緩やか温度勾配を設けて熱処理を行なうことで、溶接部の引張残留応力を低減させ、且つ、母材部に発生した引張残留応力を低減するとが可能となり、溶接構造物の疲労防止が図れる。 As described above, as in the present invention, the base metal parts 2 and 3 are subjected to heat treatment with a gentle temperature gradient, thereby reducing the tensile residual stress in the welded part and reducing the tensile residual stress generated in the base metal part. This makes it possible to prevent fatigue of the welded structure.
　本発明の実施例２について図２を用いて説明する。本実施例で用いる熱処理装置は実施例１の装置構成に加えて、母材部４および５の領域に温度勾配を設けた加熱領域を加えた点が異なる。本実施例で用いる熱処理装置の構成図を図２に示す。 Example 2 of the present invention will be described with reference to FIG. The heat treatment apparatus used in this example is different from the apparatus configuration of Example 1 in that a heating region provided with a temperature gradient is added to the regions of the base materials 4 and 5. FIG. 2 shows a configuration diagram of a heat treatment apparatus used in this embodiment.
　加熱装置の設定温度は溶接部１ではＴＣに設定し、母材部２および３の領域では２ＴＣ／３程度に設定し、母材部４および５の領域ではＴＣ／３程度に設定する。加熱装置を起動することによりそれぞれの加熱領域を所定の設定温度まで加熱する。この時、実施例１と比較して、溶接構造物にはさらに緩やかな温度勾配が得られている。さらに、溶接部１および母材部２～５を所定の設定温度で一定時間保持する。これにより、溶接構造物のそれぞれ加熱領域を均一に所定の設定温度に加熱する。最後に、加熱装置を停止し、溶接構造物を所定の設定温度から室温に冷却する。ここで加熱装置１０は、溶接部１、母材部２および３、母材部４および５の各領域において、コイルの巻き数を変化させたり、設定温度を変化させている。 The set temperature of the heating device is set to TC in the welded portion 1, set to about 2TC / 3 in the regions of the base metal portions 2 and 3, and set to about TC / 3 in the regions of the base metal portions 4 and 5. Each heating region is heated to a predetermined set temperature by starting the heating device. At this time, a gentler temperature gradient is obtained in the welded structure than in Example 1. Further, the welded part 1 and the base metal parts 2 to 5 are held at a predetermined set temperature for a predetermined time. Thereby, each heating region of the welded structure is uniformly heated to a predetermined set temperature. Finally, the heating device is stopped and the welded structure is cooled from a predetermined set temperature to room temperature. Here, the heating device 10 changes the number of turns of the coil or changes the set temperature in each region of the welded part 1, the base material parts 2 and 3, and the base material parts 4 and 5.
　以上の溶接構造物の熱処理方法を３１８．５ｍｍ、厚さが２１．４ｍｍ、長さ６０ｍｍの低合金鋼配管の溶接部に適用したときの配管外面の温度分布および残留応力分布をコンピューターシミュレーションにより算出した結果を図７および図８に示す。 The temperature distribution and residual stress distribution on the outer surface of the pipe when the above heat treatment method for the welded structure is applied to a welded part of a low alloy steel pipe of 318.5 mm, thickness 21.4 mm, and length 60 mm is calculated by computer simulation. The results are shown in FIG. 7 and FIG.
　図７に示すように、溶接部１の温度ＴＣを６８０℃に設定し、母材部２および３の温度を４４０℃に設定し、母材部４および５を２２０℃に設定し、その後、所定の設定温度に達した際の温度分布を示している。比較のため、実施例１の温度分布も図７に示す。グラフの横軸で０ｍｍは溶接中央である。縦軸は温度分布である。図７より、母材部４および５を加熱している場合、母材部の温度勾配が実施例１と比較するとさらに緩やかとなった。 As shown in FIG. 7, the temperature TC of the weld 1 is set to 680 ° C., the temperatures of the base materials 2 and 3 are set to 440 ° C., and the base materials 4 and 5 are set to 220 ° C. The temperature distribution when a predetermined set temperature is reached is shown. For comparison, the temperature distribution of Example 1 is also shown in FIG. On the horizontal axis of the graph, 0 mm is the center of welding. The vertical axis is the temperature distribution. From FIG. 7, when the base material parts 4 and 5 were heated, the temperature gradient of the base material part was further gentler than that of Example 1.
　図８に熱処理が終了後の配管外面の周方向応力を示す。周方向応力において、母材部を加熱していない場合には母材部に２００ＭＰａ程度の引張残留応力が発生する。一方、本実施例の場合、引張残留応力は５０ＭＰａ程度であり、おおよそ１／４に低減された。なお、比較のために内面を水冷した場合のシミュレーション結果も記載する。内面を冷却した場合には、配管外面においては母材部でも引張残留応力が発生していることが分かる。 Fig. 8 shows the circumferential stress on the outer surface of the pipe after the heat treatment. In the circumferential stress, when the base material part is not heated, a tensile residual stress of about 200 MPa is generated in the base material part. On the other hand, in the case of this example, the tensile residual stress was about 50 MPa, and was reduced to about 1/4. For comparison, a simulation result when the inner surface is water-cooled is also described. When the inner surface is cooled, it can be seen that tensile residual stress is also generated in the base material portion on the outer surface of the pipe.
　本発明のように、温度勾配をさらに緩やかにするこで、溶接部の引張残留応力を低減させ、且つ、母材部に発生した引張残留応力をより低減することが可能となり、溶接構造物の疲労防止が図れる。 As in the present invention, by making the temperature gradient more gentle, it becomes possible to reduce the tensile residual stress in the welded part and further reduce the tensile residual stress generated in the base material part. Prevent fatigue.
　本発明の実施例３について図３を用いて説明する。本実施例で用いる熱処理装置の構成図を図３に示す。本実施例は、溶接構造物の溶接部１に周方向にわたり第１加熱装置１１を設置し、その後、母材部２および３の周方向にわたり第２加熱装置１２および第３加熱装置１３を設置する。本実施例では３つの加熱装置を用いて熱処理を行う。 Example 3 of the present invention will be described with reference to FIG. FIG. 3 shows a configuration diagram of the heat treatment apparatus used in this embodiment. In the present embodiment, the first heating device 11 is installed in the circumferential direction of the welded portion 1 of the welded structure, and then the second heating device 12 and the third heating device 13 are installed in the circumferential direction of the base materials 2 and 3. To do. In this embodiment, heat treatment is performed using three heating devices.
　本実施例の加熱装置の起動および停止時間のグラフを図９に示す。すべての加熱装置を設置後に、第１加熱装置１１を起動し、時間が経ってから第２加熱装置１２および第３加熱装置１３を起動する。溶接部１および母材部２，３はそれぞれ所定温度ＴＣまたはＴＣ／２まで加熱してから、加熱領域の温度を均一になるように一定時間保持する。その後、第１加熱装置１１を停止し、溶接部１の温度がＴＣ／２に到達したら、第２加熱装置１２および第３加熱装置１３を停止する。最後に、溶接構造物を室温まで冷却する。 FIG. 9 shows a graph of the start and stop times of the heating device of this example. After installing all the heating devices, the first heating device 11 is activated, and the second heating device 12 and the third heating device 13 are activated after a lapse of time. The welded part 1 and the base metal parts 2 and 3 are heated to a predetermined temperature TC or TC / 2, respectively, and then held for a certain period of time so that the temperature of the heating region becomes uniform. Thereafter, the first heating device 11 is stopped, and when the temperature of the welded portion 1 reaches TC / 2, the second heating device 12 and the third heating device 13 are stopped. Finally, the welded structure is cooled to room temperature.
　このように第１加熱装置１１、第２加熱装置１２および第３加熱装置１３の時間差の起動および停止により溶接部１の温度が高く、母材部２および３の温度は低くなることで緩やかな温度勾配が得られ、溶接部の引張残留応力を低減させ、且つ、母材部に発生した引張残留応力を低減することが可能となり、溶接構造物の疲労防止が図れる。 As described above, the temperature of the welded portion 1 is increased by the start and stop of the time difference between the first heating device 11, the second heating device 12, and the third heating device 13, and the temperature of the base metal portions 2 and 3 is lowered, thereby being moderate. A temperature gradient can be obtained, the tensile residual stress in the welded portion can be reduced, and the tensile residual stress generated in the base metal portion can be reduced, thereby preventing fatigue of the welded structure.
　本発明の実施例４を説明する。本実施例で用いる熱処理装置の構成図を図４に示す。本実施例で用いる熱処理装置は実施例３に記載したものにさらに母材部４に第４加熱装置１４および母材部５に第５加熱装置１５を設置する。本実施例では５つの加熱装置を用いて溶接後熱処理を行う。本実施例の加熱装置の起動および停止時間のグラフを図１２を用いて説明する。すべての加熱装置を設置後に、第１加熱装置１１を起動し、時間が経ってから第２加熱装置１２および第３加熱装置１３を起動する。さらに時間が経過してから、第４加熱装置１４および第５加熱装置１５を起動する。溶接部１、母材部２および３および母材部４および５はそれぞれ所定温度ＴＣ、２ＴＣ／３またはＴＣ／３まで加熱してから、加熱領域の温度を均一になるように一定時間保持する。その後、第１加熱装置１１を停止し、溶接部１の温度が２ＴＣ／３に到達したら、第２加熱装置１２および第３加熱装置１３を停止し、溶接部１、母材部２および３がＴＣ／３に到達してから第４加熱装置１４および第５加熱装置１５を停止する。最後に、溶接構造物全体を室温まで冷却する。 Example 4 of the present invention will be described. FIG. 4 shows a configuration diagram of the heat treatment apparatus used in this embodiment. In the heat treatment apparatus used in this embodiment, a fourth heating device 14 is installed in the base material portion 4 and a fifth heating device 15 is installed in the base material portion 5 in addition to those described in the third embodiment. In this embodiment, post-weld heat treatment is performed using five heating devices. A graph of the start and stop times of the heating device of this example will be described with reference to FIG. After installing all the heating devices, the first heating device 11 is activated, and the second heating device 12 and the third heating device 13 are activated after a lapse of time. After further elapse of time, the fourth heating device 14 and the fifth heating device 15 are started. Welded portion 1, base material portions 2 and 3 and base material portions 4 and 5 are heated to a predetermined temperature TC, 2TC / 3, or TC / 3, respectively, and then held for a certain period of time so that the temperature in the heating region becomes uniform. . Then, the 1st heating apparatus 11 is stopped, and if the temperature of the welding part 1 reaches 2TC / 3, the 2nd heating apparatus 12 and the 3rd heating apparatus 13 will be stopped, and the welding part 1, the base material parts 2 and 3 will be After reaching TC / 3, the fourth heating device 14 and the fifth heating device 15 are stopped. Finally, the entire welded structure is cooled to room temperature.
　このように第４加熱装置１４、第５加熱装置１５を設けることで、さらに緩やかな温度勾配が得られ、溶接部の引張残留応力を低減させ、且つ、母材部に発生した引張残留応力をより低減することが可能となり、溶接構造物の疲労防止が図れる。 By providing the fourth heating device 14 and the fifth heating device 15 in this way, a gentler temperature gradient is obtained, the tensile residual stress in the welded portion is reduced, and the tensile residual stress generated in the base material portion is reduced. It is possible to further reduce the fatigue of the welded structure.
　１…溶接構造物の溶接部
　２、３、４、５…母材部
　１０…加熱装置
　１１…第１加熱装置
　１２…第２加熱装置
　１３…第３加熱装置
　１４…第４加熱装置
　１５…第５加熱装置
　２０…制御装置 DESCRIPTION OF SYMBOLS 1 ... Welded part of a welded structure 2, 3, 4, 5 ... Base material part 10 ... Heating device 11 ... 1st heating device 12 ... 2nd heating device 13 ... 3rd heating device 14 ... 4th heating device 15 ... 1st 5 Heating device 20 ... Control device

Claims (9)

  1. 　溶接構造物の溶接部である第一領域および母材部である第二領域に加熱装置を設置し、
    　前記第一領域を第一温度に加熱し、
    　前記第二領域を前記第一温度より低い第二温度に加熱し、
    　前記第一及び第二温度を一定時間保持し、
    　その後、溶接構造物の第一及び第二領域を冷却させることを特徴とした熱処理方法。     A heating device is installed in the first region that is the welded portion of the welded structure and the second region that is the base material portion,
    Heating the first region to a first temperature;
    Heating the second region to a second temperature lower than the first temperature;
    Holding the first and second temperatures for a certain period of time;
    Then, the 1st and 2nd area | region of a welded structure is cooled, The heat processing method characterized by the above-mentioned.
  2. 　請求項１に記載した熱処理方法において、
    　前記母材部において第三領域を追加し、前記第三領域を前記第二温度より低い第三温度に加熱することを特徴とした熱処理方法。     The heat treatment method according to claim 1,
    A heat treatment method, wherein a third region is added in the base material portion, and the third region is heated to a third temperature lower than the second temperature.
  3. 　請求項１に記載した熱処理方法において、
    　前記加熱装置は複数の加熱装置で構成され、
    　前記第一領域の加熱装置を起動してから、時間差を設けて前記第二領域の加熱装置を起動し、
    　前記第一及び第二領域の温度を一定時間保持してから第一領域の加熱装置を停止し、
    　第一領域の温度が第二領域の温度に到達してから、第二領域の加熱装置を停止することを特徴とした熱処理方法。     The heat treatment method according to claim 1,
    The heating device is composed of a plurality of heating devices,
    After starting the heating device of the first region, start the heating device of the second region with a time difference,
    Holding the temperature of the first and second regions for a certain period of time, then stopping the heating device of the first region,
    The heat processing method characterized by stopping the heating apparatus of a 2nd area | region after the temperature of a 1st area | region reaches the temperature of a 2nd area | region.
  4. 　請求項３に記載した熱処理方法において、
    　前記母材部において前記第二温度より低い第三温度に加熱する第三領域の加熱装置をさらに追加し、
    　前記第二領域の加熱装置を起動してから、時間差を設けて前記第三領域の加熱装置を起動し、
    　前記第一、第二及び第三温度を一定時間保持し、
    　前記第二領域の温度が前記第三領域の温度に達してから、第三領域の加熱装置を停止することを特徴とした熱処理方法。     In the heat treatment method according to claim 3,
    Further adding a third region heating device for heating to a third temperature lower than the second temperature in the base material part,
    After starting the heating device of the second region, start the heating device of the third region with a time difference,
    Holding the first, second and third temperatures for a certain period of time;
    A heat treatment method characterized by stopping the heating device of the third region after the temperature of the second region reaches the temperature of the third region.
  5. 　請求項１乃至４のいずれかに一項に記載した熱処理方法において、
    　前記各領域の温度は、前記第一領域の加熱温度から、前記構造物の置かれた環境温度まで段階的に温度勾配を設けたことを特徴とした熱処理方法。     In the heat treatment method according to any one of claims 1 to 4,
    The temperature of each of the regions is a heat treatment method characterized by providing a temperature gradient stepwise from the heating temperature of the first region to the environmental temperature where the structure is placed.
  6. 　溶接構造物の溶接部である第一領域を第一の温度に加熱し、母材部である第二領域を前記第一温度より低い第二温度に加熱する加熱装置と、
    　前記加熱装置を制御する制御装置を有することを特徴とする熱処理装置。     A heating device that heats a first region that is a welded portion of the welded structure to a first temperature, and that heats a second region that is a base material portion to a second temperature lower than the first temperature;
    A heat treatment apparatus comprising a control device for controlling the heating device.
  7. 　請求項６に記載した熱処理装置において、
    　前記加熱装置は、母材部において前記第二温度より低い第三温度に加熱する第三領域を設けたことを特徴とする熱処理装置。     In the heat treatment apparatus according to claim 6,
    The said heating apparatus provided the 3rd area | region heated to 3rd temperature lower than said 2nd temperature in the base material part, The heat processing apparatus characterized by the above-mentioned.
  8. 　請求項６に記載した熱処理装置において、
    　前記加熱装置は複数の加熱装置で構成され、
    　前記制御装置は前記第一領域の加熱装置を起動してから、時間差を設けて前記第二領域の加熱装置を起動し、前記第一及び第二領域の温度を一定時間保持してから第一領域の加熱装置を停止し、第一領域の温度が第二領域の温度に到達してから、第二領域の加熱装置を停止することを特徴とした熱処理装置。     In the heat treatment apparatus according to claim 6,
    The heating device is composed of a plurality of heating devices,
    The controller activates the heating device in the first region, then activates the heating device in the second region with a time difference, and holds the temperature of the first and second regions for a certain period of time. A heat treatment apparatus characterized by stopping the heating device in the region and stopping the heating device in the second region after the temperature in the first region reaches the temperature in the second region.
  9. 　請求項８に記載した熱処理装置において、
    　前記加熱装置は、前記母材部において前記第二温度より低い第三温度に加熱する第三領域の加熱装置をさらに有し、
    　前記制御装置は前記第二領域の加熱装置を起動してから、時間差を設けて前記第三領域の加熱装置を起動し、前記第一、第二及び第三温度を一定時間保持し、前記第二領域の温度が前記第三領域の温度に達してから、第三領域の加熱装置を停止することを特徴とした熱処理装置。     In the heat treatment apparatus according to claim 8,
    The heating device further includes a third region heating device for heating to a third temperature lower than the second temperature in the base material portion,
    The controller activates the heating device in the second region, then activates the heating device in the third region with a time difference, holds the first, second and third temperatures for a certain period of time, and A heat treatment apparatus characterized by stopping the heating device in the third region after the temperature in the second region reaches the temperature in the third region.
PCT/JP2013/072643 2013-08-26 2013-08-26 Method and apparatus for heat-treating welded structure WO2015029095A1 (en)

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Publication number Priority date Publication date Assignee Title
CN110408765A (en) * 2019-09-06 2019-11-05 哈尔滨锅炉厂有限责任公司 A kind of thick-walled vessel case heat treating method
WO2021184537A1 (en) * 2020-03-20 2021-09-23 中国石油大学(华东) Local heat treatment method for regulating residual stress by primary and auxiliary heating

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JPS5538943A (en) * 1978-09-11 1980-03-18 Hitachi Ltd Locally annealing method for welded structure
JPS5573828A (en) * 1978-11-28 1980-06-03 Sumitomo Metal Ind Ltd Reducing method of residual stress at circumferential weld zone of steel pipe
JPS61170517A (en) * 1985-01-23 1986-08-01 Hitachi Ltd Heat treatment of welded structure
JPS6263620A (en) * 1985-09-13 1987-03-20 Hokkaido Electric Power Co Inc:The Method for improving residual stress of hollow body

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JPS5538943A (en) * 1978-09-11 1980-03-18 Hitachi Ltd Locally annealing method for welded structure
JPS5573828A (en) * 1978-11-28 1980-06-03 Sumitomo Metal Ind Ltd Reducing method of residual stress at circumferential weld zone of steel pipe
JPS61170517A (en) * 1985-01-23 1986-08-01 Hitachi Ltd Heat treatment of welded structure
JPS6263620A (en) * 1985-09-13 1987-03-20 Hokkaido Electric Power Co Inc:The Method for improving residual stress of hollow body

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110408765A (en) * 2019-09-06 2019-11-05 哈尔滨锅炉厂有限责任公司 A kind of thick-walled vessel case heat treating method
WO2021184537A1 (en) * 2020-03-20 2021-09-23 中国石油大学(华东) Local heat treatment method for regulating residual stress by primary and auxiliary heating

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