CN113201627B - Local heat treatment method for inner wall of large quenched and tempered steel pressure container after repair welding - Google Patents

Local heat treatment method for inner wall of large quenched and tempered steel pressure container after repair welding Download PDF

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CN113201627B
CN113201627B CN202110337397.3A CN202110337397A CN113201627B CN 113201627 B CN113201627 B CN 113201627B CN 202110337397 A CN202110337397 A CN 202110337397A CN 113201627 B CN113201627 B CN 113201627B
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heat treatment
temperature
repair welding
heating
determining
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CN113201627A (en
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蒋文春
罗云
金强
谷文斌
解学方
李少华
沈溃领
赵旭
曹怀祥
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China University of Petroleum East China
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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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • 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

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Abstract

The invention discloses a local heat treatment method after repair welding of the inner wall of a large quenched and tempered steel pressure vessel, which comprises the following steps: (1) determining related size parameters of a repair welding area of the quenched and tempered steel container; (2) determining a local heat treatment heating mode; (3) determining the times of temperature rise and temperature drop of local heat treatment; (4) determining a heating range of local heat treatment; (5) determining the heat preservation range of local heat treatment; (6) determining a local heat treatment heating process: comprises heat treatment heat preservation temperature and heat preservation time; (7) arranging temperature measuring and controlling thermocouples; (8) the heat treatment was carried out and the heat treatment temperature profile was recorded. The invention provides a local heat treatment method after repair welding of the inner wall of a large quenched and tempered steel pressure vessel, which provides strict standard operation for heat treatment after welding and can effectively reduce the residual stress of a repair welding area.

Description

Local heat treatment method for inner wall of large quenched and tempered steel pressure container after repair welding
Technical Field
The invention relates to the technical field of postweld heat treatment of pressure vessels, in particular to a method for performing postrepair welding local heat treatment on the inner wall of a large quenched and tempered steel pressure vessel.
Background
The pressure container inevitably generates various defects such as cracks, corrosion, abrasion and the like in the manufacturing, installation and service processes, and if the defects are not processed in time, the safe operation of equipment is greatly threatened. In order to prolong the service life of the pressure vessel and reduce the production cost, the pressure vessel is usually repaired locally by adopting a repair welding method to recover the structural integrity of the pressure vessel, however, a large repair welding residual stress is inevitably introduced into a repair welding area after the repair welding, the existence of the residual stress has great influence on the later service life of the repair welding equipment, and particularly stress corrosion failure is easily caused. The local heat treatment after repair welding is an effective means for eliminating the residual stress after repair welding, but the current domestic and foreign heat treatment standards do not make detailed regulations on the local heat treatment process after repair welding, such as a heating mode, a heating range, a heat preservation range and the like, and the parameters are key for influencing the stress elimination effect of repair welding heat treatment. If the key process is not properly selected, an improper temperature gradient is generated, new thermal stress and residual deformation are introduced, and the heat treatment effect is influenced. In particular, for quenched and tempered steel, the requirements on the heat treatment process are more strict, and the quenched and tempered steel refers to steel for quenching and tempering at the temperature range of 500-650 ℃ after being quenched into martensite, such as nuclear power pressure vessel SA508Gr3C11 quenched and tempered steel and nuclear power steel containment SA738Gr.B quenched and tempered steel, which have extremely high requirements on the heat treatment temperature, and the temperature difference of the heat treatment temperature can not exceed 25 ℃. Therefore, for local post-weld heat treatment after repair welding of quenched and tempered steel, strict heat treatment specifications are required to guide field technicians to operate.
Disclosure of Invention
The invention aims to provide a local heat treatment method after repair welding of the inner wall of a large quenched and tempered steel pressure vessel.
The invention specifically adopts the following technical scheme:
a local heat treatment method after repair welding of the inner wall of a large quenched and tempered steel pressure vessel comprises the following steps:
(1) determining related size parameters of a repair welding area of a quenched and tempered steel container: including repair welding area, container wall thickness T and original weld seam width W1Repair welding width W2Repair welding seam length L and repair welding seam thickness t;
(2) determining a heating mode of local heat treatment;
(3) determining the times of temperature rise and temperature drop of local heat treatment: determining the times of temperature rise and temperature drop according to the wall thickness of the container in the repair welding area;
(4) determining the heating range of the local heat treatment: according to repair weldingThickness of regional vessel wall T, original weld width W1Repair welding width W2Determining the arrangement range of the local heat treatment heating belt by the repair welding seam length L, wherein the arrangement range of the local heat treatment heating belt is irrelevant to the repair welding seam thickness t;
(5) determining the heat preservation range of local heat treatment: determining the arrangement range of the heat preservation belt according to the heating range in the step (4);
(6) determining a local heat treatment heating process: comprises heat treatment heat preservation temperature and heat preservation time;
(7) arranging temperature measuring and controlling thermocouples;
(8) the heat treatment was carried out and the heat treatment temperature profile was recorded.
Further, the heating mode of the local heat treatment in the step (2) is electromagnetic induction heating.
According to the technical scheme, electromagnetic induction heating is adopted, the heating efficiency is high, the environment is protected, energy is saved, the repair welding area is heated conveniently through a heat transfer method, and the heating temperature of the repair welding area can be accurately controlled.
Further, in the step (3), the number of times of temperature rise n1＝T/50，n1Taking an integer upwards; number of cooling times n2＝T/50，n2And taking an integer from the bottom.
In the technical scheme, the heating times and the cooling times of the local heat treatment are determined according to the wall thickness range of the pressure container in the repair welding area, and for a thick-wall container with a certain thickness, the temperature of the inner wall and the temperature of the outer wall are difficult to reach the same heat treatment temperature by adopting a one-section heating mode, and the same is true in the cooling stage. If the temperature of the inner and outer walls cannot be maintained within a predetermined range, thermal stress due to temperature unevenness is generated. Therefore, a certain relation between the heating and cooling times of the heat treatment and the wall thickness is obtained through a large number of tests and simulation analysis, the heating and cooling times can be directly determined through the formula, and the consistency of the inner wall temperature and the outer wall temperature is ensured.
Further, the arrangement range of the heating band in the step (4) comprises the axial width of the heating band along the cylinder and the circumferential length of the heating band along the cylinder, wherein the axial width Z of the heating band along the cylinder1＝W1+W2+100n12, heating band along the circumferential length L of the cylinder1＝L+100n1*2，n1Is the number of temperature increases in step (3), n1And taking an integer upwards.
In the technical scheme, the arrangement range of the local heat treatment heating belt is determined according to the size of the repair welding area, the temperature equalizing area of the repair welding seam is the welding seam and exceeds the two sides of the welding seam by 100mm respectively, and in order to ensure that the repair welding seam and the surrounding area are all in the heating target temperature range, through a large number of tests and numerical simulation calculation, the arrangement range of the heating belt, the wall thickness T of the container and the original width W of the welding seam are found1Repair welding width W2And the length L of the repair welding seam is basically irrelevant to the thickness of the repair welding seam and the diameter of the cylinder. When the size of the heating belt is Z1And L1When the temperature is within the range, the temperature equalizing zone of the repair welding area can be ensured to be within the limited heating range.
Further, the arrangement range of the heat preservation belt in the step (5) comprises the axial width and the circumferential length of the heat preservation belt, wherein the axial width Z of the heat preservation belt2＝Z1+200n2Length L of the heat-insulating belt2＝L1+250n2，n2Is the number of cooling times in step (3), n2And taking an integer from the bottom.
Among the above-mentioned technical scheme, through setting up heat preservation area and heat preservation area range of arranging being greater than heating band range of arranging, can guarantee that heating zone and non-heating zone temperature gradient are not too big and cause new thermal stress.
Further, the heat treatment heat preservation temperature in the step (6) is obtained according to the heat treatment standard inquired by the pressure container material, and the heat treatment heat preservation time is 2n1Hour, n1Is the number of temperature increases in step (3), n1And taking an integer upwards.
Further, in the step (7), the temperature thermocouple is arranged in the temperature-equalizing zone area of the inner wall of the container, and the temperature thermocouple is arranged in the heating zone area of the outer wall of the container.
Furthermore, the circumferential interval between two adjacent temperature thermocouples is 50-100 mm, and the circumferential interval between two adjacent temperature control thermocouples is 100-150 mm.
Through the technical scheme, the uniformity of the heat treatment temperature can be accurately controlled, no temperature control dead angle is ensured, and meanwhile, the test workload can be reduced as much as possible.
The invention has the following beneficial effects:
(1) determining a local heat treatment method after repair welding of the inner wall of the quenched and tempered steel pressure vessel, providing strict standard operation for heat treatment after repair welding, and effectively reducing the residual stress of a repair welding area;
(2) by controlling the range of the heating belt and the heat preservation belt, the consistency of the temperature of the inner wall and the outer wall is ensured, and the temperature gradients of the heating area and the non-heating area are ensured to be in a certain range, so that new thermal stress can be avoided;
(3) by the arrangement method of the heating belt and the heat preservation belt, the heat treatment temperature difference in the heat treatment temperature equalization zone can be effectively controlled within 25 ℃, and the generation of sensitized cracks of the quenched and tempered steel is avoided.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a flow chart of a localized heat treatment of the present invention;
FIG. 2 is a schematic view of the inner wall of the repair weld region of the pressure vessel;
FIG. 3 is a schematic view showing the axial arrangement of the heating zone and the holding zone for the partial heat treatment of the pressure vessel;
FIG. 4 is a schematic view of the arrangement of the heating zone and the outer wall of the thermal insulation zone for the partial heat treatment of the pressure vessel;
FIG. 5 is a schematic view of a localized heat treatment measurement and temperature control thermocouple arrangement for a pressure vessel;
FIG. 6 is a temperature profile of a thermocouple for measuring and controlling temperature during partial thermal treatment in example 1 of the present invention.
The figure is marked with: 1. the inner wall of the pressure vessel; 2. original welding seams; 3. welding seams in a repair welding mode; 4. heating the tape; 5. a heat preservation belt; 6. a pressure vessel cylinder; 7. an outer wall of the pressure vessel; 8. a temperature thermocouple; 9. a temperature-controlled thermocouple.
Detailed Description
In order to make the advantages and technical solutions of the present invention clearer and clearer, the present invention is described in detail below with reference to specific embodiments and accompanying drawings.
Referring to fig. 1-5, the method for local heat treatment of the inner wall of the large quenched and tempered steel pressure vessel after repair welding comprises the following steps:
(1) determining related size parameters of repair welding area of quenched and tempered steel container
The relevant dimensions of the repair welding area of the quenched and tempered steel container mainly comprise the wall thickness T of the container in the repair welding area and the original weld width W1Repair welding width W2Repair welding seam length L and repair welding seam thickness t.
(2) Determining local heat treatment heating mode
The defect of repair welding is usually generated in the pressure vessel, and a heating band is required to be arranged on the outer wall of the vessel, so that the repair welding position is heated by a heat transfer method. The heat treatment heating modes comprise resistance heating, gas heating and electromagnetic induction heating, and because the traditional resistance heating mode is low in heating efficiency mainly through heat radiation, the temperature of an inner wall repair welding area is difficult to reach the preset temperature; the gas heating mode has lower heating efficiency, generates smoke dust and pollutes the environment; and the electromagnetic induction heating has the advantages of high heating efficiency, environmental protection and energy conservation. Therefore, in order to control the heating temperature of the repair welding region accurately, an electromagnetic induction heating method is adopted.
(3) Determining the temperature rise and temperature drop times of local heat treatment
And determining the heating and cooling times of the local electromagnetic induction according to the wall thickness of the repair welding area. The electromagnetic induction heating has skin effect, and has a certain penetration depth under certain electromagnetic induction heating process parameters. Through a plurality of tests, the thick-wall container with a certain thickness is found to be difficult to reach the same heat treatment temperature by adopting a one-section heating mode, and the same is true in the cooling stage. If the temperature of the inner and outer walls cannot be maintained within a predetermined range, thermal stress due to temperature unevenness is generated. A large number of tests and simulation analysis show that the heat treatment temperature rise and fall times and the wall thickness have a certain relation: number of times of temperature rise n1＝T/50(n1Integer up), the number of cooling times n2＝T/50(n2Taking an integer down). For example, if the wall thickness of the container in the repair welding area is 120mm, the selected heating times are integers from the top3 times, and the whole number of cooling times is 2 times.
(4) Determining local heat treatment heating range
And determining the arrangement range of the local heat treatment heating belt according to the size of the repair welding area, wherein the arrangement range comprises the axial width of the heating belt along the cylinder body and the circumferential length of the heating belt along the cylinder body, and the repair welding seam temperature equalizing area is a welding seam + exceeds the two sides of the welding seam by 100mm respectively. In order to ensure that the arrangement mode of the heating belt for heat treatment enables the repair welding seam and the surrounding area to be within the target temperature range, through a large number of tests and numerical simulation calculation, the arrangement range of the heating belt is found to be consistent with the wall thickness T of the container and the original welding seam width W1Repair welding width W2And the length L of the repair welding seam is basically irrelevant to the thickness of the repair welding seam and the diameter of the cylinder. Wherein the heating belt is along the axial width Z of the cylinder1＝W1+W2+100n 12, heating band along the circumferential length L of the cylinder1＝L+100n1*2，n1Is the number of temperature increases in step (3), n1And taking an integer upwards. When the size of the heating band is in the range, the temperature equalizing band of the repair welding area can be ensured to be in the limited heating range. If the size of the heating belt is too small, the requirement on the uniformity of the temperature equalizing zone cannot be met, and if the size of the heating belt is too large, the energy consumption is increased, so that the heating belt is not economical and practical.
(5) Determining the heat preservation range of local heat treatment
In the local heat treatment process, a heat preservation belt needs to be arranged in a proper size range to ensure that the temperature gradient of a heating area and a non-heating area cannot be overlarge, and new thermal stress is avoided. The arrangement range of the heat preservation belt comprises the axial width of the heat preservation belt and the circumferential length of the heat preservation belt, wherein the axial width Z of the heat preservation belt2＝Z1+200n2Length L of the heat-insulating belt2＝L1+250n2，n2Is the number of cooling times in step (3), n2Get an integer downwards, and the circumferential length L of the heat preservation belt2Greater than axial width Z of heat-insulating belt2The reason for this is that the temperature gradient formed in the axial direction is greater than the circumferential temperature gradient.
(6) Determining local heat treatment heating process
The local heat treatment heating process mainly comprises heat treatment heat preservation temperatureDegree and heat preservation time. The heat preservation temperature is obtained according to the heat treatment standard inquired by the pressure container material, the heat preservation time is related to the wall thickness of the container, the thicker the wall thickness is, the longer the heat preservation time needs to be selected, as the larger the thickness is, the larger the constraint is, the longer time of creep release action is needed, and the theoretical simulation calculation and test verification determine that the optimal heat treatment heat preservation time is 2n1H in which n1The number of times of temperature rise in step (3), n1And taking an integer upwards.
(7) Arrangement of temperature measuring and controlling thermocouple
The arrangement of temperature measuring and controlling thermocouples is the key for ensuring the uniformity control of the temperature of local heat treatment, the temperature measuring thermocouples are arranged in the temperature equalizing zone area of the inner wall of the container, and the circumferential interval W is formed between every two adjacent temperature measuring thermocouples350-100 mm, the temperature control thermocouples are arranged in the heating zone area on the outer wall of the container, and the circumferential interval W is formed between every two adjacent temperature control thermocouples4Is 100 to 150 mm. By uniformly arranging a plurality of temperature measuring and controlling thermocouples, the temperature uniformity can be accurately controlled, no temperature control dead angle is ensured, and the test workload is reduced as much as possible.
(8) Heat treatment is carried out
The heat treatment process was performed as described above and the heat treatment temperature profile was recorded to form a heat treatment report.
Example 1
In the embodiment, two sections of cylinders made of 12Cr2Mo1V and having the diameter of 1m and the wall thickness of 130mm are selected, the two cylinders are welded together by adopting submerged arc welding, the width of a welding line on the inner wall is 10mm, and the whole heat treatment in a furnace is carried out after the welding is finished. And processing a defect with the length of 20mm on a circumferential weld joint on the inner wall of the cylinder after heat treatment, and then performing repair welding on the defect by adopting manual arc welding, wherein the length of the repair welding seam is 26mm, and the width of the repair welding seam is 10 mm. And testing the residual stress on the surface of the repair welding seam by adopting an indentation strain method after repair welding, wherein the average residual stress in the axial direction and the circumferential direction is respectively 453MPa and 516 MPa.
After repair welding, the residual stress of a welding line area is increased, and in order to eliminate the residual stress after repair welding, the local heat treatment method after repair welding of the inner wall of the large quenched and tempered steel pressure vessel provided by the invention is adopted to carry out local heat treatment on the repair welding area.
In this embodiment, an electromagnetic induction heating method is adopted for heating, and the heat treatment process is specifically as follows:
(1) the temperature rise and fall times are as follows: calculating to obtain the temperature rise for 3 times and the temperature drop for 2 times according to a formula n which is T/50;
(2) local heat treatment heating range: axial width Z of heating belt 110+10+100 x 3 x 2-620 mm, heating band circumferential length L1＝26+200*3＝626mm；
(3) Local heat treatment heat preservation range: axial width Z of heat preservation zone1620+200 x 2-1020 mm, the length L of the heat preservation belt in the circumferential direction2＝626+250*2＝1126mm；
(4) Checking the heat preservation temperature of the heat treatment to be 700 ℃ according to the heat treatment standard, and calculating the heat preservation time 2 x 3-6 h according to a formula;
(5) arrangement positions of temperature measurement and control thermocouples: the temperature thermocouples are arranged in the temperature-equalizing zone area of the inner wall of the container, 4 temperature thermocouples are arranged, and the circumferential interval W is formed between every two adjacent temperature thermocouples350mm, the temperature control thermocouples are arranged in the heating zone area on the outer wall of the container, 4 temperature control thermocouples are arranged, and the circumferential interval W is formed between every two adjacent temperature control thermocouples4Is 150 mm;
(6) and (3) carrying out local heat treatment on the repair welding area according to the heat treatment process, recording heat treatment temperature curves, and respectively selecting heat treatment temperature curves of two temperature measuring points on the inner wall and the outer wall, as shown in figure 6.
As can be seen from FIG. 6, the maximum temperature difference along the thickness direction in the whole heating process of the inner wall and the outer wall of the pressure vessel is 13 ℃, which can meet the requirement of the temperature uniformity of the quenched and tempered steel in the local heat treatment.
In addition, the indentation strain method is adopted to test the residual stress on the surface of the repair welding seam after local heat treatment, the measured residual stress is 225MPa and 251MPa respectively, and the residual stress eliminating level of the overall heat treatment is achieved, which shows that the residual stress eliminating effect of the local heat treatment method after repair welding is good.
The parts not mentioned above can be realized by referring to the prior art.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.

Claims (4)

1. A local heat treatment method after repair welding of the inner wall of a large quenched and tempered steel pressure vessel is characterized by comprising the following steps:
(1) determining related size parameters of a repair welding area of a quenched and tempered steel container: including repair welding area container wall thickness T and original welding seam width W1Repair welding width W2Repair welding seam length L and repair welding seam thickness t;
(2) determining a heating mode of local heat treatment: heating by adopting electromagnetic induction;
(3) determining the times of temperature rise and temperature drop of local heat treatment: determining the times of temperature rise and temperature drop according to the wall thickness of the container in the repair welding area;
(4) determining the heating range of the local heat treatment: according to the wall thickness T of the container in the repair welding area and the original welding seam width W1Repair welding width W2Determining the arrangement range of the local heat treatment heating belt by the repair welding seam length L, wherein the arrangement range of the local heat treatment heating belt is irrelevant to the repair welding seam thickness t;
(5) determining the heat preservation range of local heat treatment: determining the arrangement range of the heat preservation belt according to the heating range in the step (4);
(6) determining a local heat treatment heating process: comprises heat treatment heat preservation temperature and heat preservation time;
(7) arranging temperature measuring and controlling thermocouples;
(8) carrying out heat treatment, and recording a heat treatment temperature curve;
in the step (3), the number of times of temperature rise n1＝T/50，n1Taking an integer upwards; number of cooling times n2＝T/50，n2Taking an integer downwards;
the arrangement range of the heating band in the step (4) comprises the axial width of the heating band along the cylinder body and the circumferential length of the heating band along the cylinder body, wherein the axial width Z of the heating band along the cylinder body1＝W1+W2+100n1X 2, heating the band edgeBarrel circumferential length L1＝L+100n1*2，n1Is the number of temperature increases in step (3), n1Taking an integer upwards;
the arrangement range of the heat preservation zone in the step (5) comprises the axial width of the heat preservation zone and the circumferential length of the heat preservation zone, wherein the axial width Z of the heat preservation zone2＝Z1+200n2Length L of the heat-insulating belt2＝L1+250n2，n2Is the number of cooling times in step (3), n2And taking an integer from the bottom.
2. The method for local heat treatment of the inner wall of the large quenched and tempered steel pressure vessel after repair welding according to claim 1, wherein the heat treatment heat preservation temperature in the step (6) is obtained according to a heat treatment standard inquired by a pressure vessel material, and the heat treatment heat preservation time is 2n1Hour, n1Is the number of temperature increases in step (3), n1And taking an integer upwards.
3. The method for local heat treatment of the inner wall of the large quenched and tempered steel pressure vessel after repair welding according to claim 1, wherein in the step (7), the temperature thermocouple is arranged in a temperature-equalizing zone area of the inner wall of the vessel, and the temperature thermocouple is arranged in a heating zone area of the outer wall of the vessel.
4. The method for locally heat treating the inner wall of the large quenched and tempered steel pressure vessel after repair welding according to claim 1, wherein the circumferential interval between two adjacent temperature thermocouples is 50-100 mm, and the circumferential interval between two adjacent temperature control thermocouples is 100-150 mm.
CN202110337397.3A 2021-03-30 2021-03-30 Local heat treatment method for inner wall of large quenched and tempered steel pressure container after repair welding Active CN113201627B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731131A (en) * 1985-01-23 1988-03-15 Hitachi, Ltd. Method of subjecting welded structure to heat treatment
CN105200224A (en) * 2015-11-10 2015-12-30 山东核电设备制造有限公司 Heat treatment method after local welding of quenched and tempered material super-large container
CN105714065A (en) * 2014-12-04 2016-06-29 重庆旭新悦数控机械有限公司 Heat treatment process for pressure vessel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731131A (en) * 1985-01-23 1988-03-15 Hitachi, Ltd. Method of subjecting welded structure to heat treatment
CN105714065A (en) * 2014-12-04 2016-06-29 重庆旭新悦数控机械有限公司 Heat treatment process for pressure vessel
CN105200224A (en) * 2015-11-10 2015-12-30 山东核电设备制造有限公司 Heat treatment method after local welding of quenched and tempered material super-large container

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