CN108380801A - A kind of manufacturing process of large pressurized vessel tube sheet forging - Google Patents
A kind of manufacturing process of large pressurized vessel tube sheet forging Download PDFInfo
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- CN108380801A CN108380801A CN201810149272.6A CN201810149272A CN108380801A CN 108380801 A CN108380801 A CN 108380801A CN 201810149272 A CN201810149272 A CN 201810149272A CN 108380801 A CN108380801 A CN 108380801A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/28—Normalising
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The present invention provides a kind of manufacturing process of large pressurized vessel tube sheet forging, belong to heavy forging heat treatment process field, the specific steps are forging heat treatment → forging → heat treatment after forging for the manufacturing process of the large pressurized vessel tube sheet forging, present invention process is ripe, facilitate and solves to be susceptible to forging conjunction in production process, low qualified, the non-uniform problem of internal modification, heat treatment after forging step is that pre-treatment → first time Isothermal Bainite processing → first time the pre-heat treatment → first time normalized treatment → second of bainite handles → second the pre-heat treatment → second of normalized treatment → third time bainite processing → dehydrogenation, the white point in forging can be effectively removed, crystal grain thinning, be conducive to improve forging intensity.
Description
Technical field
The invention belongs to heavy forging technical field of heat treatment technology more particularly to a kind of large pressurized vessel tube sheet forging
Manufacturing process.
Background technology
Pressure vessel refers to filling gas or liquid, carries the Sealing Arrangement of certain pressure, and reactor, divides heat exchanger
Belong to pressure vessel from device and storage etc..Pressure vessel has in process to be extremely widely applied, the pressure of various specifications
Container is widely used in oil, natural gas, petrochemical industry and chemical industry etc..
Current many high temperature, high pressure, hydrogen-type corrosion, super-pressure key equipment such as nuclear pressure shell, large-scale hydrogenation reactor, EO/
The pressure vessels such as EG device reaction devices all use smithwelding formula.As large-scale ethylene reaction device uses ultra-large type fixed tube sheet type heavy wall
Heat exchanger, tube sheet are to be used to support the part of shell and pipe in reactor.
The manufacture characteristic of ultra-large tube sheet is of high cost, performance requirement is high, production difficulty is big.It needs by rational heat
Science and engineering skill improves the property indices of tube sheet forging, meets user's requirement.It is large-scale in traditional tube sheet forging manufacture
Tube sheet generally use monoblock type manufactures, and the defects of easily causing coarse grains and inclusion crack, causes rejection rate higher, is easy to make
At huge economic losses.The internal soundness of large-scale tube sheet how is improved, product qualification rate is improved, is always to influence large-scale pressure to hold
One of the problem of device production domesticization.
Heat treatment is metal works to be heated to certain temperature, and be put into oil after held for some time at such a temperature
Or cooled down with friction speed in water, by changing, metal material shows or interior tissue controls a kind of technique of its performance.
Chinese Patent Application No. is 201310262384.X, a kind of entitled pressure vessel ultra-large tube sheet of innovation and creation
The heat treatment process of forging, belongs to heavy forging technical field of heat treatment technology, and the heat treatment process includes heat treatment after forging work
Skill, property heat treatment technique；The heat treatment after forging technique uses normalizing+normalizing+high tempering, at the performance heat
Science and engineering skill uses quenching+high tempering.
But existing technology is closed there is forging is susceptible in production process, low qualified and internal modification are uneven
Even problem.
Therefore, a kind of manufacturing process of large pressurized vessel tube sheet forging is invented to be very necessary.
Invention content
In order to solve the above technical problem, the present invention provides a kind of manufacturing process of large pressurized vessel tube sheet forging, with
It solves to be susceptible to forging conjunction, low qualified and the non-uniform problem of internal modification in production process existing for existing technology,
A kind of manufacturing process of large pressurized vessel tube sheet forging specifically includes following steps：
Step 1, heat treatment before forging：
Pressure container tube plate is heated with forging stock, processing step is：
S1, forging stock is placed in heating furnace, is heated with≤25 ± 5 DEG C/h of speed, forging stock is made slowly to be heated to 400 ± 50
℃；
S2, it is heated with≤50 ± 5 DEG C/h of speed, so that forging stock is slowly heated to 650 ± 50 DEG C, heating time is not less than 5
Hour；
S3, it is heated again with≤80 ± 20 DEG C/h of speed, so that forging stock is slowly heated to 930 ± 20 DEG C, heating time is not less than
3.5 hour；
S4, it is heated again with≤100 DEG C/h of speed, forging stock is made slowly to be heated to 1250 ± 10 DEG C, heating time is not less than reaching
To forging temperature, 16 hours are kept the temperature under this forging temperature；
Step 2, forging：
1250 DEG C of S1, initial forging temperature, 800 DEG C of final forging temperature；
S2, forging stock is forged using the pulling of jumping-up+WHF methods twice, upsetting pull technique is enterprising in kiloton forging press twice
Row starts first time upsetting pull forging after reaching just forging temperature, i.e. first time jumping-up+WHF methods pull out, and reduction ratio when jumping-up is
53%, 6-10 passages are arranged when first time upsetting pull, it is the flat anvil up and down of 1500mm to select width, retains 152mm when with a time into anvil
The tower amount of connecing, into anvil amount 1400mm, when 180 ° and 360 ° of overturning wrong half anvil, push and measure 20-25%, last time forging end is arrived down
Between secondary forging, forging stock is heated with≤100 DEG C/h of speed, until 1250 ± 10 DEG C are heated to, under this forging temperature
Heat preservation 15 hours；Arrange 3-5 passages, remaining operating quantity consistent with first time upsetting pull operation in second of upsetting pull operation；
S3, forging stock is hung to heating furnace, temperature is controlled at 1280 DEG C, and ensures heat penetration；
Step 3, heat treatment after forging：
S1, pre-treatment；In work piece hoisting to 600-650 DEG C of holding furnace after forging, 8 hours are kept the temperature at this temperature；
S2, the processing of first time Isothermal Bainite；It is air-cooled to 450-500 DEG C after heat preservation, then goes to furnace cooling to 300-350 DEG C,
20 hours are kept the temperature at 300-350 DEG C；
S3, first time the pre-heat treatment；670 ± 10 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
6.2 hours, 8-12 hours are kept the temperature after reaching 670 ± 10 DEG C at this temperature；
S4, first time normalized treatment；860 ± 20 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
3.2 hours, section 0.7-0.9h/100mm was pressed at this time and is kept the temperature；
S5, second of bainite processing；Forging is air-cooled to 450-500 DEG C after the completion of heat preservation, is furnace-cooled to again after air-cooled
300-350 DEG C, 18-25 hours are kept the temperature at 300-350 DEG C；
S6, second of the pre-heat treatment；670 ± 10 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
6.2 hours, 8-12 hours are kept the temperature after reaching 670 ± 10 DEG C at this temperature；
S7, second of normalized treatment；840 ± 20 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
2.9 hours, section 1.2-1.5h/100mm was pressed at this time and is kept the temperature；
S8, the processing of third time bainite；Forging is air-cooled to 450-500 DEG C after the completion of heat preservation, is furnace-cooled to again after air-cooled
300-350 DEG C, 18-25 hours are kept the temperature at 300-350 DEG C；
S9, dehydrogenation；630 ± 15 DEG C are heated slowly to≤60 DEG C/h of speed, is kept the temperature by section 12h/100mm, with
≤ 50 DEG C/h of speed are furnace-cooled to 400 DEG C, then will slowly be come out of the stove to 120 DEG C with≤30 DEG C/h of speed.
Beneficial effects of the present invention：Present invention process is ripe, facilitates and solves to be susceptible to forging conjunction, qualification rate in production process
It is relatively low, the non-uniform problem of internal modification, the present invention in workpiece forging after the completion of further include multi-step heat treatment so that inside forging
Crystallinity is more uniform, is conducive to improve forging intensity.
Specific implementation mode
Embodiment 1
First forging stock is placed in heating furnace before forging, is heated with 20 DEG C/h of speed, forging stock is made slowly to be heated to 350
DEG C, it is heated with 45 DEG C/h of speed, so that forging stock is slowly heated to 600 DEG C, heating time is not less than 5 hours, then with 60
DEG C/h speed heating, so that forging stock is slowly heated to 910 DEG C, heating time is not less than 3.5 hours, then with 100 DEG C/h
Speed heating, so that forging stock is slowly heated to 1240 DEG C, reach forging temperature, 16 hours are kept the temperature under this forging temperature.
1250 DEG C of initial forging temperature when forging, 800 DEG C of final forging temperature, using jumping-up+WHF methods twice pulling to forging stock into
Row forging, upsetting pull technique carries out on 500 tonnes of forging presses twice, after reaching just forging temperature, starts first time upsetting pull forging, i.e.,
First time jumping-up+WHF method pulls out, and reduction ratio when jumping-up is 53%, and when first time upsetting pull arranges 6 passages, selects the width to be
The flat anvil up and down of 1500mm overturns 180 ° and 360 ° with a time into the tower amount of connecing for retaining 152mm when anvil into anvil amount 1400mm
When wrong half anvil, push and measure 20%, last time forging terminates between forging next time, and forging stock is heated with 100 DEG C/h of speed,
Until being heated to 1240 DEG C, 15 hours are kept the temperature under this forging temperature；3 passages are arranged in second of upsetting pull operation, remaining operation
Amount is consistent with first time upsetting pull operation, forging stock is hung to heating furnace later, temperature is controlled at 1280 DEG C, and ensures heat penetration.
After the completion of forging, by the work piece hoisting after forging to 600 DEG C of holding furnace, 8 hours are kept the temperature at this temperature, is protected
It is air-cooled to 450 DEG C after temperature, then goes to furnace cooling to 300 DEG C, keeps the temperature 20 hours at 300 DEG C, then with 60 DEG C/h of speed
Be heated slowly to 660 DEG C, heating time is not less than 6.2 hours, keeps the temperature 8 hours after reaching 60 DEG C at this temperature, with 60 DEG C/it is small
When speed be heated slowly to 840 DEG C, heating time is not less than 3.2 hours, presses section 0.7h/100mm at this time and keeps the temperature, has kept the temperature
Forging is air-cooled to 450 DEG C after, 300 DEG C are furnace-cooled to again after air-cooled, 18 hours are kept the temperature at 300 DEG C, after the completion of heat preservation with
60 DEG C/h of speed is heated slowly to 660 DEG C, and heating time is not less than 6.2 hours, is protected at this temperature after reaching 660 DEG C
Temperature 8 hours is heated slowly to 820 DEG C with 60 DEG C/h of speed, and heating time is not less than 2.9 hours, presses section at this time
1.2h/100mm is kept the temperature, and forging is air-cooled to 450 DEG C after the completion of heat preservation, 300 DEG C are furnace-cooled to again after air-cooled, is protected at 300 DEG C
Temperature 18 hours, 615 DEG C are heated slowly to 60 DEG C/h of speed, are kept the temperature by section 12h/100mm, with 50 DEG C/h of speed
400 DEG C are furnace-cooled to, then will slowly be come out of the stove to 120 DEG C with 30 DEG C/h of speed.
Embodiment 2
Forging stock is placed in heating furnace before forging, is heated with 25 DEG C/h of speed, forging stock is made slowly to be heated to 400 DEG C,
It after being heated to 400 DEG C, is heated with 50 DEG C/h of speed, so that forging stock is slowly heated to 650 DEG C, heating time is small not less than 5
When, then heated with 80 DEG C/h of speed, so that forging stock is slowly heated to 930 DEG C, heating time is not less than 3.5 hours, then with
100 DEG C/h of speed heating, makes forging stock slowly be heated to 1250 DEG C, heating time not less than forging temperature is reached, forges herein
16 hours are kept the temperature at a temperature of making.
1250 DEG C of initial forging temperature in forging process, 800 DEG C of final forging temperature, using the pulling of jumping-up+WHF methods twice to forging
Base is forged, and upsetting pull technique carries out on 500 tonnes of forging presses twice, after reaching just forging temperature, starts first time upsetting pull forging
It makes, i.e., first time jumping-up+WHF methods pull out, and reduction ratio when jumping-up is 53%, and when first time upsetting pull arranges 8 passages, select the width to be
The flat anvil up and down of 1500mm overturns 180 ° and 360 ° with a time into the tower amount of connecing for retaining 152mm when anvil into anvil amount 1400mm
When wrong half anvil, push and measure 22%, last time forging terminates between forging next time, and forging stock is heated with 100 DEG C/h of speed,
Until being heated to 1250 DEG C, 15 hours are kept the temperature under this forging temperature；4 passages are arranged in second of upsetting pull operation, remaining operation
Amount is consistent with first time upsetting pull operation, forging stock is hung to heating furnace later, temperature is controlled at 1280 DEG C, and ensures heat penetration；
After the completion of forging, by the work piece hoisting of forging to 625 DEG C of holding furnace, 8 hours are kept the temperature at this temperature, heat preservation terminates
After be air-cooled to 450-500 DEG C, then go to furnace cooling to 300-350 DEG C, 20 hours kept the temperature at 330 DEG C, with 60 DEG C/h of speed
Be heated slowly to 670 DEG C, heating time is not less than 6.2 hours, keeps the temperature 10 hours after reaching 670 DEG C at this temperature, with 60 DEG C/
The speed of hour is heated slowly to 860 DEG C, and heating time is not less than 3.2 hours, presses section 0.8h/100mm at this time and keeps the temperature, heat preservation
Forging is air-cooled to 480 DEG C after the completion, 320 DEG C are furnace-cooled to again after air-cooled, 21 hours are kept the temperature at 320 DEG C, with 60 DEG C/h
Speed be heated slowly to 670 DEG C, heating time is not less than 6.2 hours, keeps the temperature 10 hours after reaching 670 DEG C at this temperature,
840 DEG C are heated slowly to 60 DEG C/h of speed, heating time is not less than 2.9 hours, presses section 1.36h/100mm at this time
Heat preservation, is air-cooled to 480 DEG C by forging after the completion of heat preservation, 325 DEG C is furnace-cooled to again after air-cooled, 21 hours are kept the temperature at 325 DEG C, with
60 DEG C/h of speed is heated slowly to 630 DEG C, is kept the temperature by section 12h/100mm, 400 are furnace-cooled to 50 DEG C/h of speed
DEG C, then will slowly be come out of the stove to 120 DEG C with 30 DEG C/h of speed.
Embodiment 3
Before forging, forging stock is placed in heating furnace, is heated with 30 DEG C/h of speed, forging stock is made slowly to be heated to 450 DEG C, with
55 DEG C/h of speed heating, makes forging stock slowly be heated to 700 DEG C, and heating time is not less than 5 hours, then with 100 DEG C/it is small
When speed heating, so that forging stock is slowly heated to 950 DEG C, heating time is not less than 3.5 hours, then with 100 DEG C/h of speed
Heating makes forging stock slowly be heated to 1260 DEG C, and heating time, not less than forging temperature is reached, it is small to keep the temperature 16 under this forging temperature
When；
In forging process, 1250 DEG C of initial forging temperature, 800 DEG C of final forging temperature carries out forging stock using the pulling of jumping-up+WHF methods twice
Forging, upsetting pull technique carries out on 500 tonnes of forging presses twice, after reaching just forging temperature, starts first time upsetting pull forging, i.e., and the
The pulling of jumping-up+WHF method, reduction ratio when jumping-up is 53%, and it is 1500mm that when first time upsetting pull, which arranges 10 passages, selections width,
Flat anvil up and down, with a time into the tower amount of connecing for retaining 152mm when anvil, into anvil amount 1400mm, when 180 ° and 360 ° of overturning, is wrong partly
Anvil pushes and measures 25%, and last time forging terminates between forging next time, and forging stock is heated with 100 DEG C/h of speed, until plus
Heat keeps the temperature 15 hours to 1260 DEG C under this forging temperature；5 passages are arranged in second of upsetting pull operation, remaining operating quantity and the
Upsetting pull operation is consistent, forging stock is hung to heating furnace, temperature is controlled at 1280 DEG C, and ensures heat penetration；
After the completion of forging, by work piece hoisting to 650 DEG C of holding furnace, 8 hours are kept the temperature at this temperature, it is air-cooled after heat preservation
To 500 DEG C, then furnace cooling is gone to 350 DEG C, keep the temperature 20 hours at 350 DEG C, 680 are heated slowly to 60 DEG C/h of speed
DEG C, heating time is not less than 6.2 hours, keeps the temperature 12 hours after reaching 680 DEG C at this temperature, slow with 60 DEG C/h of speed
Slow to be heated to 880 DEG C, heating time is not less than 3.2 hours, presses section 0.9h/100mm at this time and keeps the temperature, by forging after the completion of heat preservation
500 DEG C are air-cooled to, 350 DEG C are furnace-cooled to again after air-cooled, keeps the temperature 25 hours at 350 DEG C, the speed with 60 DEG C/h slowly adds
To 680 DEG C, heating time is not less than 6.2 hours heat, 12 hours is kept the temperature after reaching 680 DEG C at this temperature, with 60 DEG C/h
Speed is heated slowly to 860 DEG C, and heating time is not less than 2.9 hours, presses section 1.5h/100mm at this time and keeps the temperature, after the completion of heat preservation
Forging is air-cooled to 500 DEG C, 350 DEG C are furnace-cooled to again after air-cooled, 25 hours are kept the temperature at 350 DEG C, with 60 DEG C/h of speed
645 DEG C are heated slowly to, is kept the temperature by section 12h/100mm, is furnace-cooled to 400 DEG C with 50 DEG C/h of speed, then with 30 DEG C/h
Speed will slowly come out of the stove to 120 DEG C.
Several experiment materials are extracted on the forge piece of three groups of embodiments, and performance is carried out to the experiment material and tissue is examined
It surveys, testing result is as follows：
Present invention process is ripe, facilitates and solves to be susceptible to forging conjunction in production process, low qualified, and internal modification is non-uniform
Problem.
Using technical solutions according to the invention or those skilled in the art under the inspiration of technical solution of the present invention,
Similar technical solution is designed, and reaches above-mentioned technique effect, is to fall into protection scope of the present invention.
Claims (1)
1. a kind of manufacturing process of large pressurized vessel tube sheet forging, which is characterized in that this kind of large pressurized vessel tube sheet forging
Manufacturing process specifically include following steps：
Step 1, heat treatment before forging：
Pressure container tube plate is heated with forging stock, processing step is：
S1, forging stock is placed in heating furnace, is heated with≤25 ± 5 DEG C/h of speed, forging stock is made slowly to be heated to 400 ± 50
℃；
S2, it is heated with≤50 ± 5 DEG C/h of speed, so that forging stock is slowly heated to 650 ± 50 DEG C, heating time is not less than 5
Hour；
S3, it is heated again with≤80 ± 20 DEG C/h of speed, so that forging stock is slowly heated to 930 ± 20 DEG C, heating time is not less than
3.5 hour；
S4, it is heated again with≤100 DEG C/h of speed, forging stock is made slowly to be heated to 1250 ± 10 DEG C, heating time is not less than reaching
To forging temperature, 16 hours are kept the temperature under this forging temperature；
Step 2, forging：
1250 DEG C of S1, initial forging temperature, 800 DEG C of final forging temperature；
S2, forging stock is forged using the pulling of jumping-up+WHF methods twice, upsetting pull technique is enterprising in kiloton forging press twice
Row starts first time upsetting pull forging after reaching just forging temperature, i.e. first time jumping-up+WHF methods pull out, and reduction ratio when jumping-up is
53%, 6-10 passages are arranged when first time upsetting pull, it is the flat anvil up and down of 1500mm to select width, retains 152mm when with a time into anvil
The tower amount of connecing, into anvil amount 1400mm, when 180 ° and 360 ° of overturning wrong half anvil, push and measure 20-25%, last time forging end is arrived down
Between secondary forging, forging stock is heated with≤100 DEG C/h of speed, until 1250 ± 10 DEG C are heated to, under this forging temperature
Heat preservation 15 hours；Arrange 3-5 passages, remaining operating quantity consistent with first time upsetting pull operation in second of upsetting pull operation；
S3, forging stock is hung to heating furnace, temperature is controlled at 1280 DEG C, and ensures heat penetration；
Step 3, heat treatment after forging：
S1, pre-treatment；In work piece hoisting to 600-650 DEG C of holding furnace after forging, 8 hours are kept the temperature at this temperature；
S2, the processing of first time Isothermal Bainite；It is air-cooled to 450-500 DEG C after heat preservation, then goes to furnace cooling to 300-350 DEG C,
20 hours are kept the temperature at 300-350 DEG C；
S3, first time the pre-heat treatment；670 ± 10 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
6.2 hours, 8-12 hours are kept the temperature after reaching 670 ± 10 DEG C at this temperature；
S4, first time normalized treatment；860 ± 20 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
3.2 hours, section 0.7-0.9h/100mm was pressed at this time and is kept the temperature；
S5, second of bainite processing；Forging is air-cooled to 450-500 DEG C after the completion of heat preservation, is furnace-cooled to again after air-cooled
300-350 DEG C, 18-25 hours are kept the temperature at 300-350 DEG C；
S6, second of the pre-heat treatment；670 ± 10 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
6.2 hours, 8-12 hours are kept the temperature after reaching 670 ± 10 DEG C at this temperature；
S7, second of normalized treatment；840 ± 20 DEG C are heated slowly to≤60 DEG C/h of speed, heating time is not less than
2.9 hours, section 1.2-1.5h/100mm was pressed at this time and is kept the temperature；
S8, the processing of third time bainite；Forging is air-cooled to 450-500 DEG C after the completion of heat preservation, is furnace-cooled to again after air-cooled
300-350 DEG C, 18-25 hours are kept the temperature at 300-350 DEG C；
S9, dehydrogenation；630 ± 15 DEG C are heated slowly to≤60 DEG C/h of speed, is kept the temperature by section 12h/100mm, with
≤ 50 DEG C/h of speed are furnace-cooled to 400 DEG C, then will slowly be come out of the stove to 120 DEG C with≤30 DEG C/h of speed.
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|---|---|---|---|
| CN201810149272.6A CN108380801B (en) | 2018-02-13 | 2018-02-13 | Manufacturing process of large pressure vessel tube plate forging |
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|---|---|---|---|
| CN201810149272.6A CN108380801B (en) | 2018-02-13 | 2018-02-13 | Manufacturing process of large pressure vessel tube plate forging |
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| CN108380801B CN108380801B (en) | 2020-05-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111558680A (en) * | 2020-06-22 | 2020-08-21 | 无锡派克新材料科技股份有限公司 | Manufacturing method of large-section F53 solid forging |
| CN114453539A (en) * | 2022-01-14 | 2022-05-10 | 伊莱特能源装备股份有限公司 | Tube plate forging piece forging changing process |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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