WO2015029095A1 - Procédé et appareil destinés à une structure soudée par un traitement thermique - Google Patents

Procédé et appareil destinés à une structure soudée par un traitement thermique 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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Prior art keywords
region
temperature
heating device
heat treatment
heating
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PCT/JP2013/072643
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English (en)
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/fr
Priority to JP2015533786A priority patent/JPWO2015029095A1/ja
Publication of WO2015029095A1 publication Critical patent/WO2015029095A1/fr

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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

　La présente invention a pour objet un procédé et un appareil permettant d'effectuer un traitement thermique susceptible de réduire une contrainte résiduelle de traction dans une partie soudée et une contrainte résiduelle de traction créée dans une partie en un matériau parent. Pour résoudre le problème susmentionné, la présente invention est caractérisée en ce qu'un dispositif de chauffage est installé dans des première et seconde régions. La première région est une partie soudée d'une structure soudée. La seconde région est une partie en un matériau parent. La première région est chauffée à une première température. La seconde région est chauffée à une seconde température inférieure à la première. Les première et seconde températures sont maintenues pendant un certain temps, puis les première et seconde régions de la structure soudée sont refroidies.
PCT/JP2013/072643 2013-08-26 2013-08-26 Procédé et appareil destinés à une structure soudée par un traitement thermique WO2015029095A1 (fr)

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PCT/JP2013/072643 WO2015029095A1 (fr) 2013-08-26 2013-08-26 Procédé et appareil destinés à une structure soudée par un traitement thermique
JP2015533786A JPWO2015029095A1 (ja) 2013-08-26 2013-08-26 溶接構造物の熱処理方法および装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110408765A (zh) * 2019-09-06 2019-11-05 哈尔滨锅炉厂有限责任公司 一种厚壁容器局部热处理方法
WO2021184537A1 (fr) * 2020-03-20 2021-09-23 中国石油大学(华东) Procédé de traitement thermique local de régulation de contrainte résiduelle par chauffages primaire et auxiliaire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (ja) * 1985-01-23 1986-08-01 Hitachi Ltd 溶接構造物の熱処理法
JPS6263620A (ja) * 1985-09-13 1987-03-20 Hokkaido Electric Power Co Inc:The 中空体の残留応力の改善法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (ja) * 1985-01-23 1986-08-01 Hitachi Ltd 溶接構造物の熱処理法
JPS6263620A (ja) * 1985-09-13 1987-03-20 Hokkaido Electric Power Co Inc:The 中空体の残留応力の改善法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110408765A (zh) * 2019-09-06 2019-11-05 哈尔滨锅炉厂有限责任公司 一种厚壁容器局部热处理方法
WO2021184537A1 (fr) * 2020-03-20 2021-09-23 中国石油大学(华东) Procédé de traitement thermique local de régulation de contrainte résiduelle par chauffages primaire et auxiliaire

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