CN114518383B - Test board for simulating heat treatment of pressure vessel and method for performing heat treatment test - Google Patents
Test board for simulating heat treatment of pressure vessel and method for performing heat treatment test Download PDFInfo
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- CN114518383B CN114518383B CN202210038137.0A CN202210038137A CN114518383B CN 114518383 B CN114518383 B CN 114518383B CN 202210038137 A CN202210038137 A CN 202210038137A CN 114518383 B CN114518383 B CN 114518383B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 223
- 238000012360 testing method Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000008859 change Effects 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000007669 thermal treatment Methods 0.000 claims abstract 5
- 238000003466 welding Methods 0.000 claims description 49
- 238000004321 preservation Methods 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 9
- 230000017525 heat dissipation Effects 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000004080 punching Methods 0.000 abstract description 4
- 206010066901 Treatment failure Diseases 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 238000002076 thermal analysis method Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 10
- 238000009413 insulation Methods 0.000 description 6
- 238000009529 body temperature measurement Methods 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 230000005855 radiation Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to the technical field of heat treatment, discloses a test board for simulating a pressure container to perform heat treatment, adopts a rectangular plate which is made of the same material and has the same wall thickness as the pressure container and a certain size as the heat treatment test board, and particularly discloses three methods for determining the length of the heat treatment test board; and the method for making the thermal analysis boundary conditions of the thermal treatment test plate and the pressure vessel in the radial direction, the circumferential direction and the axial direction equivalent, so that the thermal treatment test plate can accurately simulate the temperature change of the surface and the inside of the pressure vessel, and a thermal treatment test is carried out. The invention also discloses a method for carrying out heat treatment test by adopting the heat treatment test plate. According to the invention, the heat treatment test plate is adopted to simulate the pressure vessel, and the heat treatment process parameters of the heat treatment test plate are obtained by punching the surface and the inner temperature control points of the heat treatment test plate, arranging thermocouples and measuring the temperature in the heat treatment process, and then the heat treatment process parameters are applied to the pressure vessel, so that the heat treatment process control of the pressure vessel can be more accurate, and the heat treatment failure is avoided.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to a test board for simulating heat treatment of a pressure vessel and a method for performing heat treatment test.
Background
The pressure vessel is more than or equal to 0.1MPa of working pressure and more than or equal to 0.03m of volume 3 And the diameter is more than or equal to 150mm, and the liquid is filled with gas, liquefied gas and medium, and the highest working temperature is more than or equal to the standard boiling point. The large-scale pressure vessel comprises a reaction kettle, a reaction tower, a storage tank and the like.
In the welding process of the pressure vessel, the welding stress is always generated after welding due to the non-uniformity of heating and cooling and the restraint or external restraint of the vessel component. The presence of welding stresses in the container component can reduce the actual load carrying capacity of the container weld joint area, create plastic deformation, and in severe cases, can also lead to failure of the container component. Because of the large pipe diameter, the pipe wall thickness and the large restraint degree of the pressure vessel with thick walls made of alloy steel materials, the welded joint of the pressure vessel also has hardening tissues, so that the mechanical properties of the materials are worsened. In addition, such hardened structure may cause damage to the joint under the action of welding stress and hydrogen. Cold cracking easily occurs during the weld forming process. The main reasons for cold cracking are that hydrogen enters the weld joint during welding, embrittles the welded joint, causes stepped cracks to occur in the weld or the weld joint, and when hydrogen molecules accumulate at the weld defect in a large amount, larger local stresses are generated, and the cracks gradually grow to finally crack the weld or the weld joint. The pre-welding preheating and post-welding heat treatment can effectively reduce the welding stress, and is a reliable method for reducing the post-welding dehydrogenation and the cold cracking tendency of a thick-wall container welding structure. The welding process of the thick-wall container has larger heating and cooling non-uniformity, the welding stress, plastic deformation and the like of the welding joint area are more serious, and the postweld heat treatment is required to be carried out according to the standard specification.
The stress relief heat treatment is performed by heating the welded joint region of the welded container to a temperature above the recrystallization temperature, ac 1 And (3) after heat preservation, air cooling or furnace cooling to 20-300 ℃, and discharging and air cooling to normal temperature. The stress annealing process is eliminated without tissue transformation, and the mechanism is that the yield strength of the material is reduced by heating, so that local plastic deformation and creep deformation are generated, and the aim of relaxing welding stress is fulfilled. There are two common methods: firstly, the whole weldment is put into a heating furnace for heat treatment, slowly heated to the heat treatment temperature, kept warm according to the heat treatment procedure, and finally cooled in the air or in the furnace. The other method is local heat treatment, namely heating only the welding seam and the nearby area, then preserving heat and slowly cooling, thus achieving the purpose of eliminating welding stress. The large thick-wall container can only adopt a local postweld heat treatment method of a welding joint area.
A schematic diagram of heating, temperature control and heat preservation of local heat treatment is shown in figure 1, wherein h is k The maximum width of the welding line, HB, the width of the heating belt, GCB, the width of the heat insulation belt, SB and the width of the temperature equalization belt, and the temperature equalization belt is ensured to reach the standard specified temperature in the heat treatment process. Because the heat treatment process must be a lossless process, it is impossible toThe temperature measurement is perforated in the container, and the heating power and the heating time are controlled by the existing local heat treatment technology through surface temperature measurement, however, the temperature rising rate of a large thick-wall pressure container is low, the temperature gradient in the wall thickness direction is large, and a large temperature difference exists between the surface and the inside.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the test board for simulating the heat treatment of the pressure vessel and the method for performing the heat treatment test, and the heat treatment process of the heat treatment test board is adjusted to enable the heat treatment temperature of the key position of the heat treatment test board to reach the process requirement, so that the temperature of the key position in the thick-wall pressure vessel is indirectly proved to reach the preset value, and the heating temperature and the heat preservation time of the middle position of the wall thickness of the vessel are ensured to reach the requirements of standard specifications.
To achieve the above object, the present invention relates in one aspect to a test panel for simulating a heat treatment of a pressure vessel.
A test board for simulating heat treatment of a pressure vessel, which adopts a rectangular board of the same material, the same wall thickness and a certain size as the pressure vessel as a heat treatment test board, wherein the size of the heat treatment test board is determined as follows:
the heat treatment test plate comprises a welding line, and the section size of the welding line of the heat treatment test plate is the same as that of the circumferential welding line of the cylinder;
the thickness direction of the heat treatment test plate simulates the radial direction of the cylinder, and the heat boundary condition of the heat treatment test plate and the circumferential weld of the cylinder in the thickness direction is naturally equivalent;
the width direction of the heat treatment test plate simulates the circumference of the cylinder, and the circumferential direction of the cylinder is an adiabatic boundary condition, so the width of the heat treatment test plate is not limited;
the length direction of the heat treatment test plate simulates the axial direction of the cylinder body, and the heat dissipation capacity of the unit volume of the heat treatment test plate in unit time is the same as that of the cylinder body.
Further, the welding process, the welder and the welding materials of the heat treatment test plate welding seam and the cylinder circumferential welding seam are the same.
Further, the welding seam of the heat treatment test plate and the circumferential welding seam of the cylinder body are heated by a heater, an insulation layer is additionally arranged, and natural convection is carried out outside the insulation layer.
Further, heat preservation is required in the width direction of the heat treatment test plate, so that heat is not transferred outwards in the width direction.
In one embodiment of the present invention, the length of the heat treatment panel is determined as follows: firstly, finding out a point with normal temperature in the axial direction of the cylinder body through numerical simulation or test, wherein a first distance is reserved between the normal temperature point and a welding seam of the cylinder body of the pressure container, and the length of the heat treatment test plate is 2 times of the first distance.
In another embodiment of the present invention, the length of the heat treatment panel may be equal to the length of the cylinder.
In still another embodiment of the present invention, the length of the heat treatment test plate takes a fixed value, and a first temperature change curve of a preset point in the length direction of the cylinder of the pressure vessel is obtained through numerical simulation when the cylinder of the pressure vessel is heat treated, and a second temperature change curve of two ends of the heat treatment test plate along the length direction is the same as the first temperature change curve.
Further, the heat treatment test plate is provided with temperature control devices at both ends in the length direction. The temperature control device comprises a water cooling piece, an air cooling piece or a heating piece and the like.
In another aspect, the invention relates to a method for performing a heat treatment test using the test panel for performing heat treatment in the simulated pressure vessel.
The method for performing the heat treatment test by using the test plate for performing the heat treatment by using the simulated pressure vessel comprises the following steps of:
a temperature measuring piece is arranged at a preset position of the heat treatment test plate;
and performing heat treatment on the heat treatment test plate, obtaining a heating power of the heat treatment test plate, a heat flow density on a heating surface and a temperature change curve in the wall thickness direction, determining a temperature change curve of the pressure container cylinder body and a heat treatment process according to the obtained temperature change curve of the heat treatment test plate, and determining the heat treatment heating power of the pressure container cylinder body by multiplying the heat flow density by a heating area through referring to the heat flow density heated by the heat treatment test plate.
Preferably, the preset positions include a first preset position, a second preset position and a third preset position, the first preset position is located at the center of a welding line of the heat treatment test plate, the second preset position is located at a welding line of the heat treatment test plate, and the third preset position is located at the edge of a temperature equalizing zone of the heat treatment test plate; the temperature measuring pieces are arranged at the first preset position, the second preset position and the third preset position in a one-to-one correspondence mode.
Compared with the prior art, the invention has the following beneficial effects:
(1) The heat treatment test plate determined by the invention can accurately simulate the surface and internal temperature of the pressure vessel and carry out heat treatment test;
(2) According to the determined heat treatment test plate, the invention provides a method for carrying out heat treatment test of a thick-wall pressure vessel by adopting the heat treatment test plate, wherein the heat treatment test plate is adopted to simulate the pressure vessel, and the heat treatment process parameters of the heat treatment test plate are obtained by punching the surface and the inner temperature control points of the heat treatment test plate, arranging thermocouples and measuring the temperature in the heat treatment process, and then the heat treatment process parameters are applied to the pressure vessel, so that the heat treatment process control of the pressure vessel is more accurate, and the heat treatment failure is avoided.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the heating, temperature control and thermal range requirements of a local heat treatment;
FIG. 2 is a schematic view of a pressure vessel and a heat treatment panel thereof;
FIG. 3 is a schematic view of a heat treatment panel structure;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a graph of the intermediate axial temperature distribution of the wall thickness of the pressure vessel cylinder;
FIG. 6 is a graph showing the temperature change in the wall thickness direction at different positions after the heating is completed;
FIG. 7 is a graph showing temperature changes in the wall thickness direction at different positions after the end of heat preservation;
FIG. 8 is a graph of temperature versus time at different locations in the center of a weld;
FIG. 9 is a graph of heat up time versus position in the center of a weld.
Reference numerals: h is a k -maximum width of weld; HB-heating band width; GCB-insulating tape width; SB-width of the soaking zone; 1-a heat insulating material; 2-a heater; 3-a pressure vessel; 4-a thermal insulation belt; 5-heating the belt; 6, welding; 7-a temperature equalizing zone; 8-heat treatment test plate; delta 0 -insulation layer thickness; delta-test panel thickness; l-test panel length; w-panel width.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
A method of heat treating a simulated pressure vessel of a test panel comprising the steps of:
the first step: determining a heat treatment test plate
A rectangular plate which is made of the same material, has the same wall thickness and has a certain size as a pressure vessel is used as a heat treatment test plate, and the heat treatment test plate and the cylinder body have the same heat boundary condition during operation;
the heat treatment test plate can simulate the equivalent temperature boundary condition of the heat treatment process of the pressure vessel, and the invention enables the heat treatment test plate and the pressure vessel to reach the equivalent boundary condition through theoretical analysis, numerical simulation and certain technical measures. The pressure vessel is partially heat treated and the heat treatment test plate 8 is shown in fig. 2, and the pressure vessel 3 is provided with a heat preservation belt 4, a heating belt 5, a welding line 6 and a temperature equalization belt 7. First, the pressure vessel is thermally analyzed, and when the circumferential weld of the pressure vessel is locally (or wholly) thermally treated, referring to fig. 2, the cylinder is in an adiabatic state in the circumferential direction (because the cylinder is annular, circumferentially closed, and no heat dissipation exists), and the cylinder is in a natural convection heat dissipation state in the axial direction.
In order for the heat treatment panel to accurately simulate the cylinder of a pressure vessel, it is desirable that the heat treatment panel and the cylinder have the same thermal boundary conditions.
The structure of the heat treatment test plate is shown in fig. 3 and 4, and the maximum width h of the welding line on the heat treatment test plate k The heat treatment test plate comprises a heating band width HB, a heat insulation band width GCB and a uniform temperature band width SB, wherein the size of the heat treatment test plate is determined as follows:
1) The section size of the welding seam of the heat treatment test plate is the same as that of the circumferential welding seam of the cylinder body, and the welding process, the welding personnel, the welding materials and the like are the same.
2) The thickness direction of the heat treatment test plate (the thickness delta of the test plate) simulates the radial direction of the cylinder (namely the thickness delta of the wall), the heat boundary conditions of the heat treatment test plate and the circumferential weld of the cylinder in the thickness direction are naturally equivalent, and the heat treatment test plate and the circumferential weld of the cylinder are heated by a heater, and are externally added with a heat preservation layer, wherein the thickness delta of the heat preservation layer is equal to the thickness delta of the heat preservation layer 0 Natural convection outside the heat-insulating layer.
3) The width direction of the heat treatment test plate (the width W of the test plate) simulates the circumference of the cylinder, and the circumferential direction of the cylinder is an adiabatic boundary condition, so that the width of the heat treatment test plate is not limited, heat preservation is required in the width direction of the heat treatment test plate, and the heat is not transferred outwards in the width direction.
4) The length direction (test plate length L) of the heat treatment test plate simulates the axial direction of the cylinder, and the heat radiation is required to be carried out on the heat treatment test plate in the length direction because the cylinder can radiate through heat conduction in the axial direction, and the heat radiation amount of the unit volume of the heat treatment test plate in unit time is the same as that of the cylinder, so that the heat treatment test plate can accurately simulate the cylinder of the pressure vessel.
Specifically, the length of the heat treatment panels was determined in the following manner:
firstly, finding out the point of the cylinder body at normal temperature in the axial direction through numerical simulation or test, and measuring the distance between the girth weld and the normal temperature point, so that the length of the heat treatment test plate is 2 times of the distance. Thus, the heat treatment test plate can simulate the axial direction of the cylinder in the length direction. This approach may be applied to pressure vessels with longer cylinders, for example, pressure vessels with cylinders longer than 5 meters. In this example, after 2300mm from the center of the weld was measured according to numerical simulation or test, the temperature of the center of the pressure vessel was lowered to room temperature (20 ℃ C.), and the length of the heat treatment panel was 4600mm.
And a second step of: heat treatment test on heat-treated test panels
The heat treatment test board is like a welding test board, provides a solution for destructive detection, avoids destructive punching and temperature measurement of the pressure container, and achieves the effects of temperature measurement and control of relevant parts of the pressure container.
And punching holes in the middle of the welding line, the upper surface of the edge of the uniform temperature zone, the middle, the lower surface and other key points, placing thermocouples (temperature measuring pieces), and detecting the temperature of the key points when a heat treatment test is carried out.
Taking a pressure vessel cylinder with the thickness of 94mm, the material of Q345R and the inner diameter of 5500mm as an example, a heat treatment test is carried out:
heating is carried out at different heating rates, heating can be completed for 1h at the stage of 20-300 ℃, and heating is carried out at the heating rate of 5500/delta in the range of 300-600 ℃, wherein delta is the thickness of a container, 94mm is taken, the heating rate of the section is 58 ℃/h, and the section needs 5.2h. According to GB/T30583-2014, the heat preservation time isThe final localized heat treatment process for the isopachous weld is shown in Table 1, with a total heat treatment time of 8.64 hours (excluding the cool down time).
Table 1 rectangular heat treatment test plate local heat treatment process
And a third step of: obtaining the temperature change curve of each key point along with time
According to the obtained temperature change curve of the heat treatment test plate, the axial temperature change curve in the middle of the wall thickness of the cylinder body of the pressure container can be obtained, as shown in fig. 5, so that the heat treatment process of the pressure container can be formulated by referring to the temperature change curve.
Example 2
The length of the heat treatment panels was determined in the following manner: the heat treatment test plate is taken to be 2000mm, and the temperature of the pressure vessel at the position 1000mm away from the center of the welding line is 110 ℃ and the heat flow density is 2645W/m according to the numerical simulation or test measurement result 2 The temperature of the heat treatment test plate is controlled to be about 110 ℃ through steel plate heat conduction, strong convection heat conduction or water flow heat conduction, and finally the pressure vessel is simulated by the heat treatment test plate. The procedure is as in example 1.
Example 3
The length of the heat treatment panels was determined in the following manner: the length of the heat treatment test plate is a fixed value, for example, the length of the heat treatment test plate is 1m, a temperature change curve (a curve changing with the heating temperature of the center point of the heating belt) at the position 0.5m away from the circumferential weld on the cylinder body is obtained through numerical simulation or test, and then the temperature change curve on the edge (length direction) of the heat treatment test plate is identical with the temperature change curve at the position 0.5m of the cylinder body. Thus, the heat dissipation of the heat treatment test plate in the length direction can be ensured to be similar to that of the cylinder in the length direction. The temperature change curve of the edge of the heat treatment test plate can be controlled by a water cooling device, an air cooling device or a heating device. The procedure is as in example 1.
Example 4
The length of the heat treatment panels was determined in the following manner: the length of the heat treatment test plate is equal to the length of the cylinder body. This approach may be applied to pressure vessels with shorter cylinders, for example pressure vessels with a cylinder length of less than 2 meters. The procedure is as in example 1.
The temperature change curves of the weld joint middle, the welding line and the temperature equalizing zone along the wall thickness direction are finally obtained through a heat treatment test, the temperature difference between the inner wall and the outer wall in the heat treatment process of the container (shown in fig. 6 and 7), the heating temperature change curve along the time (shown in fig. 8) and the axial heating temperature change curve of the cylinder (shown in fig. 5) can be obtained through the heat treatment test plate, meanwhile, the time difference (shown in fig. 9) required for the wall surface and the wall thickness middle position to rise to the same temperature can be obtained, and a reasonable heat treatment process can be formulated through the data obtained through the heat treatment test plate.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (9)
1. A test panel for simulating a pressure vessel for heat treatment, characterized in that a rectangular plate of the same material, the same wall thickness and a certain size as the pressure vessel is used as a heat treatment test panel, and the size of the heat treatment test panel is determined as follows:
the heat treatment test plate comprises a welding line, and the section size of the welding line of the heat treatment test plate is the same as that of the circumferential welding line of the cylinder;
the thickness direction of the heat treatment test plate simulates the radial direction of the cylinder, and the heat boundary condition of the heat treatment test plate and the circumferential weld of the cylinder in the thickness direction is naturally equivalent;
the width direction of the heat treatment test plate simulates the circumference of the cylinder, and the circumferential direction of the cylinder is an adiabatic boundary condition, so the width of the heat treatment test plate is not limited;
the length direction of the heat treatment test plate simulates the axial direction of the cylinder body, and the heat dissipation capacity of the unit volume of the heat treatment test plate in unit time is the same as that of the cylinder body;
the length of the heat treatment test plate is determined as follows: firstly, finding out a point with normal temperature in the axial direction of the cylinder body through numerical simulation or test, wherein a first distance is reserved between the normal temperature point and a welding line of the cylinder body of the pressure container, and the length of the heat treatment test plate is 2 times of the first distance.
2. The test panel for simulating heat treatment of a pressure vessel of claim 1, wherein the heat treatment test panel weld and the barrel girth weld are the same in all of welding process, welder and welding material.
3. The test panel for simulating heat treatment of a pressure vessel according to claim 1, wherein the heat treatment test panel weld and the cylinder circumferential weld are heated by a heater, and a heat-insulating layer and natural convection outside the heat-insulating layer are added.
4. The test panel for simulating heat treatment of a pressure vessel according to claim 1, wherein heat preservation is required in the width direction of the heat treatment test panel to ensure that heat is not transferred outward in the width direction.
5. The test panel for simulating thermal treatment of a pressure vessel of claim 1, wherein the length of the thermal treatment test panel is equal to the length of the cylinder.
6. The test panel for simulating heat treatment of a pressure vessel according to claim 1, wherein the length of the heat treatment test panel takes a fixed value, a first temperature change curve of a preset point in the length direction of the cylinder of the pressure vessel is obtained through numerical simulation when the cylinder of the pressure vessel is subjected to heat treatment, and a second temperature change curve of two ends of the heat treatment test panel in the length direction is identical to the first temperature change curve.
7. The test panel for simulating heat treatment of a pressure vessel according to claim 1, wherein the heat treatment test panel is provided with temperature control means at both ends in the longitudinal direction.
8. A method for performing a heat treatment test using the test panel for heat treatment of a simulated pressure vessel according to any of claims 1-7, comprising the steps of:
a temperature measuring piece is arranged at a preset position of the heat treatment test plate;
and performing heat treatment on the heat treatment test plate, obtaining a heating power of the heat treatment test plate, a heat flow density on a heating surface and a temperature change curve in the wall thickness direction, determining a temperature change curve of the pressure container cylinder body and a heat treatment process according to the obtained temperature change curve of the heat treatment test plate, and determining the heat treatment heating power of the pressure container cylinder body by multiplying the heat flow density by a heating area through referring to the heat flow density heated by the heat treatment test plate.
9. The method of performing a heat treatment test of claim 8, wherein the preset positions comprise a first preset position, a second preset position and a third preset position, the first preset position being located at a center of a weld of the heat treatment panel, the second preset position being located at a weld blend line of the heat treatment panel, the third preset position being located at an edge of a soaking zone of the heat treatment panel; the temperature measuring pieces are arranged at the first preset position, the second preset position and the third preset position in a one-to-one correspondence mode.
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| CN110530541A (en) * | 2019-08-29 | 2019-12-03 | 中国石油大学(华东) | One kind can accurately simulate large pressurized vessel post weld heat treatment temperature field computation method |
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