CN108220573B - Pipeline-like large-scale workpiece heat treatment method - Google Patents
Pipeline-like large-scale workpiece heat treatment method Download PDFInfo
- Publication number
- CN108220573B CN108220573B CN201810257795.2A CN201810257795A CN108220573B CN 108220573 B CN108220573 B CN 108220573B CN 201810257795 A CN201810257795 A CN 201810257795A CN 108220573 B CN108220573 B CN 108220573B
- Authority
- CN
- China
- Prior art keywords
- thin
- heat
- walled
- insulating material
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention provides a kind of pipeline-like large-scale workpiece heat treatment methods.In pipeline-like large-scale workpiece heat treatment method according to the present invention, before being heat-treated to duct work, inner surface and/or outer surface covering heat-insulating material to each thin-walled of duct work carry out insulation to reduce the temperature rise speed at the thin-walled position of duct work, shorten the soaking time at thin-walled position, the thin-walled position for reducing duct work and the temperature difference after the heating of heavy wall position, making duct work, bulk temperature distribution is more uniform after the heating, realize the uniformity of temperature when heating at the different-thickness position of duct work, to reduce the thermal stress of workpiece, crackle tendency and deformation, to improve the quality of duct work, performance and used life.
Description
Technical field
The present invention relates to Field of Heat-treatment more particularly to a kind of pipeline-like large-scale workpiece heat treatment methods.
Background technique
Pipeline-like large-scale workpiece is the important component in the fields such as nuclear power, thermoelectricity, petrochemical industry, and heat treatment is that improvement is pipeline-like
Large-scale workpiece tissue, the key means for improving mechanical property, reducing residual stress.But on the tube body and tube body of duct work
The thickness of pressure inlet is often different, thus leads to duct work due to thickness position heating rate difference in heat treatment process
Different parts temperature it is uneven, thermal stress, deformation, cracking can be generated, or even scrap；In order to which the position of wall thickness is sufficiently heated, meeting
The position soaking time for keeping wall thin is too long, makes coarse grains, reduces the performance and used life of duct work.
Summary of the invention
In view of the existing technical defect, the purpose of the present invention is to provide a kind of pipeline-like large-scale workpiece heat treatment sides
Method can be realized the uniformity of temperature when heating at the different-thickness position of duct work and improve the quality of duct work, property
Energy and service life.
To achieve the goals above, the present invention provides a kind of pipeline-like large-scale workpiece heat treatment methods, comprising steps of
S1: the wall thickness of duct work is measured；The most thick position of wall thickness is defined as heavy wall, wall thickness dmax, the most thick position of non-wall thickness is equal
It is defined as thin-walled, shares thin-walled at N, the wall thickness of thin-walled is d at i-thi, i=1 ..., N, N >=1；S2: it is obtained according in step S1
The wall thickness d of the heavy wall arrivedmaxWith i-th at thin-walled wall thickness di, with the inner surface of thin-walled everywhere in heat-insulating material covering duct work
The outer surface and/or；S3: will treated that duct work is put into heat-treatment furnace is heat-treated by step S2.
Beneficial effects of the present invention are as follows:
In pipeline-like large-scale workpiece heat treatment method according to the present invention, before being heat-treated to duct work, to pipe
The inner surface of each thin-walled of road workpiece and/or outer surface covering heat-insulating material carry out insulation to reduce the thin-walled of duct work
The temperature rise speed at position shortens the soaking time at thin-walled position, and the thin-walled position and heavy wall position for reducing duct work are heated
The temperature difference afterwards, making duct work, bulk temperature distribution is more uniform after the heating, realizes at the different-thickness position of duct work
The uniformity of temperature when heating, to reduce the thermal stress, crackle tendency and deformation of workpiece, to improve the matter of duct work
Amount, performance and used life.
Detailed description of the invention
Fig. 1 is the schematic diagram of the conventional duct work under pipeline-like large-scale workpiece heat treatment method according to the present invention,
Wherein there is a pressure inlet with the inner surface and duct work at heat-insulating material covering thin-walled position；
Fig. 2 is pipeline-like large-scale workpiece heat treatment method according to the present invention with complete empty blank grid and heat-insulating material
The floor map of the latticed insulating materials expansion of grid interval arrangement；
Fig. 3 is the cross-sectional view of the duct work of Fig. 1；
Fig. 4 is that the furnace temperature of heat-treatment furnace under pipeline-like large-scale workpiece heat treatment method according to the present invention rises to 1100 DEG C of mistakes
The Temperature Distribution effect picture of the duct work of a certain one embodiment of moment in journey, wherein there are two pressure inlets for duct work tool；
Fig. 5 is a certain time charts 4 during the furnace temperature of heat-treatment furnace under method according to prior art rises to 1100 DEG C
The Temperature Distribution effect picture of the duct work of embodiment；
Fig. 6 is pipeline-like large-scale workpiece heat treatment method according to the present invention and Fig. 4 under method according to prior art
Embodiment duct work heavy wall pipe thin-walled be respectively provided with more representative place heating curves and heavy wall pipe it is thin
Difference curve figure between the representative two o'clock of wall；
Fig. 7 is that the furnace temperature of heat-treatment furnace under pipeline-like large-scale workpiece heat treatment method according to the present invention rises to 1100 DEG C of mistakes
The equivalent stress distribution effect picture of the duct work of the embodiment of a certain time chart 4 in journey, wherein only showing a left side for duct work
The pressure inlet of side and its neighbouring equivalent stress distribution；
Fig. 8 is a certain time charts 4 during the furnace temperature of heat-treatment furnace under method according to prior art rises to 1100 DEG C
The equivalent stress distribution effect picture of the duct work of embodiment, wherein only show the left side of duct work pressure inlet and its near
Equivalent stress distribution；
Fig. 9 is pipeline-like large-scale workpiece heat treatment method according to the present invention and Fig. 4 under method according to prior art
Embodiment duct work left side pressure inlet root two o'clock equivalent stress time history plot.
Wherein, the reference numerals are as follows:
1 duct work
11 pressure inlets
12 main pipeline main bodys
2 heat-insulating materials
21 blank grids
22 heat-insulating material grids
Specific embodiment
It is described in detail pipeline-like large-scale workpiece heat treatment method according to the present invention with reference to the accompanying drawings.
Referring to figs. 1 to Fig. 9, pipeline-like large-scale workpiece heat treatment method of the invention comprising steps of
S1: the wall thickness of measurement duct work 1；The most thick position of wall thickness is defined as heavy wall, wall thickness dmax, non-wall thickness is most
Thick position is defined as thin-walled, shares thin-walled at N, and the wall thickness of thin-walled is d at i-thi, i=1 ..., N, N >=1；
S2: according to the wall thickness d of heavy wall obtained in step S1maxWith i-th at thin-walled wall thickness di, covered with heat-insulating material 2
The inner surface of thin-walled and/or outer surface everywhere in duct work 1；
S3: will treated that duct work 1 is put into heat-treatment furnace is heat-treated by step S2.
In pipeline-like large-scale workpiece heat treatment method according to the present invention, before being heat-treated to duct work 1, to pipe
The inner surface of each thin-walled of road workpiece 1 and/or outer surface covering heat-insulating material 2 carry out insulation to reduce duct work 1
The temperature rise speed at thin-walled position shortens the soaking time at thin-walled position, reduces the thin-walled position and heavy wall position of duct work 1
The temperature difference after heating, making duct work 1, bulk temperature distribution is more uniform after the heating, realizes the different-thickness of duct work 1
The uniformity of temperature when being heated at position, to reduce the thermal stress, crackle tendency and deformation of workpiece, to improve duct work
1 quality, performance and used life.
Referring to figs. 1 to Fig. 3, the detailed process of step S2 are as follows: by the wall thickness d of thin-walled at i-thiWith the wall thickness d of heavy wallmaxInto
Row compares, the wall thickness d of thin-walled at i-thiMeetWhen, heat-insulating material 2 is with complete empty blank grid 21 and insulation
The inner surface at thin-walled position and outer surface at the spaced apart latticed covering i-th of material grid 22；The wall of thin-walled at i-th
Thick diMeetHeat-insulating material 2 is with complete empty 22 arranged for interval of blank grid 21 and heat-insulating material grid
Latticed covering i-th at thin-walled position the inner surface and the outer surface in one of；The wall thickness d of thin-walled at i-thiMeetWhen, the inner surface at thin-walled position or outer surface at i-th is completely covered with heat-insulating material 2 or covers at i-th
Each half in the inner surface and the outer surface at thin-walled position.
In pipeline-like large-scale workpiece heat treatment method according to the present invention, the latticed insulation of thin-walled at covering i-th
The accounting r that 22 occupied area of heat-insulating material grid in material 2 accounts for the inside and outside total surface area of thin-walled at i-th meets formula: r=
(1-di/dmax).Complete empty blank net in heat-insulating material 2 can be arranged according to this formula come the heat-insulating material 2 of design grid trellis
The arrangement of lattice 21 and heat-insulating material grid 22.
As shown in figures 1 and 3, latticed heat-insulating material 2 is uniform with complete empty blank grid 21 and heat-insulating material grid 22
Ground arranged for interval.
Wherein, the area of latticed heat-insulating material 2 is 10~100mm × 10~100mm.
Heat-insulating material 2 is selected from one of alumina silicate fibre, heat-resisting bonding agent, asbestos and mineral wool or a variety of.Wherein,
Heat-resisting bonding agent can be vermiculite.
Heat-insulating material 2 falls off in order to prevent, and heat-insulating material 2 is overlayed the inner surface of throughout thin-walled by high temperature resistant support equipment
And/or on outer surface.
It should be added that, the number of the pressure inlet 11 of duct work 1 is unrestricted herein, can be one
To be multiple, not influence technique effect.As shown in figures 1 and 3, conventional duct work 1 generally has a pressure inlet 11, Fig. 4
There are two pressure inlets 11 with Fig. 5 and Fig. 7 and the duct work 1 of an embodiment shown in Fig. 8 tool.
Referring to Fig. 4 to Fig. 9, to the pipeliner of the embodiment under pipeline-like large-scale workpiece heat treatment method according to the present invention
Part 1 simplifies main pipeline main body 12 and pressure inlet 11 that duct work 1 only shows duct work 1, the implementation for convenience of explanation
Pressure inlet 11 in example is two, and the wall thickness of the main pipeline main body 12 of duct work 1 is 41.5mm, pressure inlet 11 with a thickness of
83mm, the wall of the main pipeline main body 12 of duct work 1 are thin-walled, and the wall of pressure inlet 11 is heavy wall.It is hot in being put into heat-treatment furnace
Before processing, the surface of the inner wall of main pipeline main body 12 is covered with heat-insulating material 2, is then put into the duct work 1 handled well
Heat-treatment furnace is heat-treated.Furnace temperature in heat-treatment furnace is with 1.5 DEG C of min-1Speed 600 DEG C are at the uniform velocity warming up to by room temperature,
5h is kept the temperature, then again with 2.5 DEG C of min-1Speed be at the uniform velocity warming up to 1100 DEG C, the bulk temperature of heat preservation 13h to duct work 1
Reach 1100 DEG C.As shown in figure 4, using in the main pipeline main body 12 under pipeline-like large-scale workpiece heat treatment method of the invention
The temperature difference in portion and the middle part of pressure inlet 11 is small, and as shown in figure 5, using in the main pipeline main body 12 under the method for the prior art
The temperature difference in portion and the middle part of pressure inlet 11 is significant.And as shown in the curve #2 in Fig. 6, using the main pipeline main body 12 of the prior art
Middle part and pressure inlet 11 middle part the temperature difference it is very big, be up to 80 DEG C, and as shown in the curve #3 in Fig. 6, using the present invention
Pipeline-like large-scale workpiece heat treatment method after, the temperature difference is down within 10 DEG C, therefore pipeline-like large-scale workpiece of the invention heat
Processing method is largely effective in terms of temperature harmony in improving 1 heat treatment process of duct work.As shown in fig. 7, with pipeliner
For the equivalent stress distribution of the pressure inlet 11 in the left side of part 1, using pipeline-like large-scale workpiece heat treatment method of the invention
The stress distribution of the pressure inlet 11 in left side and the pressure inlet 11 in left side and the connecting portion of main pipeline main body 12 uniformly and stress
It is worth low；And as shown in figure 8, using the pressure inlet 11 in the left side of the method for the prior art and the pressure inlet 11 and main pipeline in left side
The stress distribution of the connecting portion of main body 12 is uneven and stress value is high.Referring concurrently to Fig. 9, using pipeline-like large-scale work of the invention
The root of the pressure inlet 11 in the left side of part heat treatment method two o'clock (can duct work 1 in comparative diagram 3 pressure inlet 11
The A point and B point of root) equivalent stress value it is low, maximum value is respectively 35.9MPa and 23.0MPa；And use the side of the prior art
The two o'clock of the root of the pressure inlet 11 in the left side under method equivalent stress value it is larger, maximum value be respectively 115.7MPa and
63.0MPa.Therefore pipeline-like large-scale workpiece heat treatment method of the invention extremely has in terms of the thermal stress for reducing duct work 1
Effect.
Claims (7)
1. a kind of pipeline-like large-scale workpiece heat treatment method, which is characterized in that comprising steps of
S1: the wall thickness of measurement duct work (1)；The most thick position of wall thickness is defined as heavy wall, wall thickness dmax, non-wall thickness is most thick
Position be defined as thin-walled, share N and locate thin-walled, the wall thickness of thin-walled is d at i-thi, i=1 ..., N, N >=1；
S2: according to the wall thickness d of heavy wall obtained in step S1maxWith i-th at thin-walled wall thickness di, covered and managed with heat-insulating material (2)
The inner surface of thin-walled and/or outer surface everywhere in road workpiece (1)；
S3: will treated that duct work (1) is put into heat-treatment furnace is heat-treated by step S2；
The detailed process of step S2 are as follows:
By the wall thickness d of thin-walled at i-thiWith the wall thickness d of heavy wallmaxIt is compared,
The wall thickness d of thin-walled at i-thiMeetWhen, heat-insulating material (2) is with complete empty blank grid (21) and insulation
The inner surface at thin-walled position and outer surface at the spaced apart latticed covering i-th of material grid (22)；
The wall thickness d of thin-walled at i-thiMeetHeat-insulating material (2) with complete empty blank grid (21) and
Heat-insulating material grid (22) it is spaced apart it is latticed covering i-th at thin-walled position the inner surface and the outer surface in wherein it
One；
The wall thickness d of thin-walled at i-thiMeetWhen, the interior of thin-walled position at i-th is completely covered with heat-insulating material (2)
Each half at surface or outer surface or covering i-th in the inner surface and the outer surface at thin-walled position.
2. pipeline-like large-scale workpiece heat treatment method according to claim 1, which is characterized in that thin-walled at covering i-th
Heat-insulating material grid (22) occupied area in latticed heat-insulating material (2) accounts for accounting for for the inside and outside total surface area of thin-walled at i-th
Meet formula than r:
R=(1-di/dmax)。
3. pipeline-like large-scale workpiece heat treatment method according to claim 2, latticed heat-insulating material (2) is with complete empty sky
White grid (21) and heat-insulating material grid (22) are evenly spaced arrangement.
4. pipeline-like large-scale workpiece heat treatment method according to claim 3, which is characterized in that latticed heat-insulating material
(2) area is 10~100mm × 10~100mm.
5. pipeline-like large-scale workpiece heat treatment method according to claim 1, which is characterized in that heat-insulating material (2) is selected from
One of alumina silicate fibre, heat-resisting bonding agent, asbestos and mineral wool are a variety of.
6. pipeline-like large-scale workpiece heat treatment method according to claim 1, which is characterized in that heat-insulating material (2) is by resistance to
High-temperature support equipment overlays on the throughout inner surface of thin-walled and/or outer surface.
7. pipeline-like large-scale workpiece heat treatment method according to claim 5, which is characterized in that heat-resisting bonding agent is leech
Stone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810257795.2A CN108220573B (en) | 2018-03-27 | 2018-03-27 | Pipeline-like large-scale workpiece heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810257795.2A CN108220573B (en) | 2018-03-27 | 2018-03-27 | Pipeline-like large-scale workpiece heat treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108220573A CN108220573A (en) | 2018-06-29 |
| CN108220573B true CN108220573B (en) | 2019-08-02 |
Family
ID=62659177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810257795.2A Active CN108220573B (en) | 2018-03-27 | 2018-03-27 | Pipeline-like large-scale workpiece heat treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108220573B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2291418Y (en) * | 1996-07-04 | 1998-09-16 | 董玉顺 | High-pressure, high flow-rate vacuum air-cooled glowing furnace |
| CN1303229C (en) * | 2002-07-25 | 2007-03-07 | Posco公司 | Method and a skid member for reducing temperature difference in a heating subject and a skid apparatus using them |
| CN102021313B (en) * | 2010-07-15 | 2012-05-09 | 秦皇岛首秦金属材料有限公司 | Method for enhancing control precision of tracking system and ensuring quenching performance stability of moderately thick plates |
| CN107447090A (en) * | 2017-08-01 | 2017-12-08 | 清华大学 | Nonuniform workpiece equilibrium heat-treating methods |
| CN107641702B (en) * | 2017-10-16 | 2019-10-11 | 山东电力建设第一工程公司 | A kind of post weld heat treatment method of major diameter thick-walled pipe |
-
2018
- 2018-03-27 CN CN201810257795.2A patent/CN108220573B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108220573A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103978210B (en) | The dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part | |
| CN204159874U (en) | The dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part | |
| CN212688145U (en) | Energy-saving seamless pipe heat treatment equipment | |
| CN103924046A (en) | Vacuum annealing furnace | |
| CN112725572A (en) | Main and auxiliary induction heating local heat treatment method | |
| CN108220573B (en) | Pipeline-like large-scale workpiece heat treatment method | |
| CN105171908B (en) | A kind of steam-cured method and device | |
| CN107557538A (en) | A kind of thin-wall part process for quenching | |
| CN103757184A (en) | Vacuum electric annealing furnace | |
| CN103898634A (en) | High-temperature carbonizing furnace for carbon fiber production | |
| CN103591793B (en) | A kind of vacuum sintering furnace | |
| CN106702313B (en) | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular | |
| CN106544478A (en) | A kind of annealing furnace | |
| CN108675621B (en) | Modularized microcrystalline glass annealing crystallization furnace | |
| CN101830634B (en) | High-frequency electric sealing device for solar vacuum tubes and sealing method thereof | |
| CN210030826U (en) | Novel steel wire heat treatment device | |
| CN211255702U (en) | Quick sintering device of jumbo size optical fiber perform | |
| CN106925858A (en) | A kind of high-frequency gas protect soldering oven and its method of work | |
| CN206328451U (en) | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular | |
| CN206974175U (en) | A kind of energy saving temperature controlling industrial furnace | |
| CN206345887U (en) | Flat wire heat-treatment furnace | |
| CN106403599B (en) | Cracking furnace pipe in-situ TEM processing and heat treatment furnace | |
| CN111575471A (en) | Energy-saving seamless pipe heat treatment equipment | |
| CN221123023U (en) | Calcining machine for metal heat treatment | |
| CN105043594B (en) | Air-cooled electric thermo-couple test furnace of heat-insulation layer and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |