CN108627534B - A kind of steel plate roll-type quenching cooling rate test method and device - Google Patents
A kind of steel plate roll-type quenching cooling rate test method and device Download PDFInfo
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- CN108627534B CN108627534B CN201810439970.XA CN201810439970A CN108627534B CN 108627534 B CN108627534 B CN 108627534B CN 201810439970 A CN201810439970 A CN 201810439970A CN 108627534 B CN108627534 B CN 108627534B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
Abstract
The invention belongs to technical field of heat treatment technology, a kind of steel plate roll-type quenching cooling rate test method and device are proposed.The device temperature measuring point covers steel plate difference temperature drop region, and steel billet temperature recorder is embedded in super-thick steel plate；Steel plate roll-type quenching cooling rate test method includes steel plate acceleration and deceleration quenching, steel plate swings quenching, surface of steel plate jet parameters dynamic adjusts three processes.This method has many advantages, such as that temperature measuring point coverage area is comprehensive, test plate is few, easy to operate, test process failure rate is low, test data accuracy is high, is suitable for thickness and tests greater than 100mm steel plate roll-type quenching process cooling rate.
Description
Technical field
The invention belongs to technical field of heat treatment technology, it is related to a kind of steel plate roll-type quenching cooling rate test method and device.
Background technique
Big substance, big cross section spy's thick steel plates are the fields such as ocean engineering, derived energy chemical, water power nuclear power, engineering machinery
Important foundation material is realization steel plate microstructure homogenization and refinement after rolling, improves toughness and tenacity, eliminates residual stress, reduction
The purpose of micro-crack, is heat-treated, and is regulated and controled steel plate tissue using different heating cycle and cooling system, is obtained more
Excellent performance.Quenching is the core of super-thick steel plate heat treatment procedure, and traditional super-thick steel plate quenching is mechanical using car type furnace/outside
Change furnace+quenching bath/quenching tank, the convection current of high-temperature steel plate surface is accelerated by cooling water stirring in pond/slot, realization faster cools down.
It is low since there are steel plate cooling rates, quenching uniformity is poor, hardened face quality and plate shape deteriorate the problems such as obvious, production efficiency is low,
This heat treatment mode is gradually replaced by roll-type continuous quenching mode.
Continuous roll type quenching refers to that steel plate homogenizes after heating, is fed directly to the company of realization in roll-type quenching equipment by roller-way
Continuous quenching has many advantages, such as that big high production efficiency, intensity of cooling, uniform quenching, Quenching Sheet shape are good, becomes plate heat treatment production
The mainstream of line quenches mode.However, with steel plate thickness increase to 300mm grades, substance increase to 50 tons, quenching process center portion is cold
The critical process indexs such as speed, section cooling uniformity regulate and control difficulty it is big, by technological mathematical model calculated result often with reality
Deviation is larger, can not preferably Instructing manufacture, realization thick steel plate structure property regulate and control.Therefore, how intuitive and accurate measurement is special
Thick steel plate quenching process section each point temperature drop and cooling rate become research and development super-thick steel plate roll-type quenching new equipment technology, formulate science
Reasonable quenching technical, and then promote the key of super-thick steel plate thermal treatment quality and performance.
Patent CN102661969A discloses a kind of method for testing the different water film thickness steel plate coefficients of heat transfer, by cylinder
Shape moisture film cofferdam is welded on cylindrical steel plate surface, passes through the heating of thermocouple measurement cylindrical steel plate, sink quenching process surface
Moisture film heat transfer process temperature drop.This method is tested suitable for cylindrical steel plate immersion quenching process temperature drop, with straight thick steel herein
The test of plate jet impulse cooling procedure temperature drop is unrelated.
Patent CN104864973A discloses a kind of even buried formula temperature test side of small dimension square billet high-temperature heating process
Method tests temperature change when blank heating by thermocouple inside top embedment blank.This method is suitable for small dimension square billet
Heating process temperature test, it is unrelated with thick steel plates quenching process temperature drop of the present invention and cooling rate test.
Patent CN201464402U discloses a kind of control cooling surface coefficient of heat transfer test steel plate special sample, passes through
Steel plate sample is designed, realizes the measuring and calculating of the surface of steel plate coefficient of heat transfer.This method is suitable for thickness≤100mm on plate rolling production line
The cooling temperature drop test of relatively thin gauge medium plate, test on heat-treatment lines with the present invention for thick steel plates and quenches cooling rate
It is unrelated.
Summary of the invention
The object of the present invention is to provide a kind of steel plate roll-types to quench cooling rate test method, can accurately, continuously measure special thickness
Steel plate roll-type quenching process temperature drop curve and cooling rate formulate such steel plate quenching technique, building quenching technical number to be scientific and reasonable
It learns model, realize that structure property regulation provides data supporting.
The specific technical proposal is:
A kind of steel plate roll-type quenching cooling rate test method, temperature measuring point cover steel plate difference temperature drop region, steel billet temperature record
Instrument is embedded in super-thick steel plate；It includes steel plate acceleration and deceleration quenching, steel plate swing quenching, surface of steel plate that steel plate roll-type, which quenches cooling rate test,
Jet parameters dynamic adjusts three processes；
(1) steel plate acceleration and deceleration quenching process: empty according to steel plate is calculated after steel plate reaches heating temperature and transports heat-treatment furnace
Cold temperature drop curve selects 0.0001~0.001m/s2Acceleration accelerates into roller quenching machine high pressure section by rollgang, works as steel
By roller quenching machine high pressure section and when leaving, steel plate speed reduces to the swing speed of setting for plate tail portion；
(2) steel plate swings quenching process: steel plate tail leaves roller quenching machine high pressure section, steel plate is decelerated to setting and swings speed
After degree, basis steel sheet length is set in the swinging distance of roller quenching machine low pressure stage, steel plate front and back pendulum within the scope of swinging distance
Dynamic quenching cooling；
(3) surface of steel plate jet parameters dynamic adjustment process: according to setting steel plate when roller quenching machine low pressure stage is swung
Between and steel plate quenching process surface-center portion heat exchange/heat conducting law, adjust each water discharge nozzle of roller quenching machine low pressure stage: swing
When time passes through 1/3, water flow is down to setting water flow 2/3；When duration of oscillation passes through 1/2, water flow is down to setting water flow
1/2；When duration of oscillation passes through 2/3, water flow is down to setting water flow 1/3；Steel plate is in roller quenching machine low pressure stage cooling time
When reaching duration of oscillation, each nozzle of roller quenching machine low pressure stage is closed, and steel plate is driven out to quenching press by swing speed.
The steel plate roll-type of above method application quenches cooling rate test device, including thermocouple and steel billet temperature recorder, steel
Head section, tail portion section and the side section of plate are respectively arranged temperature measuring point, and thermocouple one is placed in drilling at each temperature measuring point
End；Steel plate cuts pore-forming close to edge any position, and bottom hole welding steel forms vallecular cavity, and moisture recorder embeds in chamber,
Top of chamber welds removable cover, and cavity wall is close to one side opening of steel plate edge；The thermocouple other end passes through steel plate and laterally welds
Stainless steel tube, pass through cavity wall side opening connect with moisture recorder；Rust steel pipe is for fixing thermocouple.The temperature measuring point selection side
Method refer to basis steel sheet roll-type quenching process end to end, upper and lower surface, the apparent region of side portion difference temperature drop, it is disconnected to choose steel plate head
Face it is wide to upper surface of steel plate at center, lower surface of steel plate, away from 1/4 thickness of upper surface of steel plate, away from 1/4 thickness of lower surface of steel plate
Place, center portion totally 5 temperature measuring points, choose steel plate tail section it is wide to upper surface of steel plate, lower surface of steel plate at center, away from table on steel plate
At 1/4 thickness of face, away from 1/4 thickness of lower surface of steel plate, center portion totally 5 temperature measuring points, choose steel plate side section length direction center
Locate upper surface of steel plate, lower surface of steel plate, away from 1/4 thickness of upper surface of steel plate, away from 1/4 thickness of lower surface of steel plate, center portion totally 5
Temperature measuring point.
The steel plate roll-type quenching cooling rate test method has such as compared with existing steel plate roll-type quenches cooling rate test method
Lower advantage:
1, the big regional choice temperature measuring point of the practical quenching process temperature drop difference of basis steel sheet, can test out monolith steel plate head
Tail, upper and lower surface, thickness direction, side different location quenching process temperature variations, temperature measuring point coverage area are comprehensive.
2, steel billet temperature recorder is moved integrally with test steel plate, being capable of the entire quenching process light plate temperature of real-time testing
Variation, and the steel plates compound movement process such as complete acceleration and deceleration, swings, test use plate quantity few, easy to operate；In moisture recorder
In embedding steel plate, cavity upper design cover board can facilitate and realize into furnace, operation of coming out of the stove, and can effectively realize quenching process watertight
Envelope, successfully tested rate is high, failure rate is low.
3, water discharge nozzle, steel plate operation speed are set and controlled according to the practical temperature drop law of thick steel plates quenching process
Degree, steel plate duration of oscillation meet actual production conditions, and test data accuracy is high, confidence level is good.
Detailed description of the invention
Fig. 1 is that the steel plate temperature measuring point position in the present invention is chosen and steel billet temperature recorder fixes schematic diagram；
Fig. 2 is the steel plate roll-type quenching cooling rate test schematic diagram in the present invention.
In figure: 1 upper surface of steel plate；2 steel plate side temperature measuring points；3 steel plate head temperature measuring points；4 steel plate tail temperature measuring points；5 steel
Plate lower surface；6 thermocouples；7 steel billet temperature recorders；8 steel billet temperature recorder placed cavities；9 steel billet temperature recorder placed cavities
Upper cover plate；10 steel billet temperature recorder placed cavity areoles；11 thermocouples fix steel pipe；12 heat treatment heating furnaces；13 roll-types are quenched
Lighter；14 rollgangs；15 roller quenching machine high pressure sections；16 roller quenching machine low pressure stages；The spray of 17 roller quenching machine low pressure stages
Mouth；18 roller quenching machine high pressure section nozzles；19 steel plate acceleration and deceleration quenching process；20 steel plates swing quenching process；21 surface of steel plate
Jet parameters dynamic adjustment process.
Specific embodiment
Embodiment one, the present embodiment provides a kind of test steel plate processing of steel plate roll-type quenching cooling rate test method of the present invention
Implementation process, as shown in Figure 1, illustrating implementation process for selecting 300mm thickness, 2500mm wide, 8m long steel plate.Steel plate 1 is cut
After side, scale, deburring, steel plate head temperature measuring point 3, steel plate are drilled through in 1 head section of steel plate, tail portion section, side section respectively
Tail portion temperature measuring point 4 and steel plate side temperature measuring point 2.Temperature measuring point bore position is respectively upper surface of steel plate 1, away from upper surface of steel plate 11/4
At plate thickness, 1 thickness Xiang Zhongxin of steel plate, away from 51/4 plate thickness of lower surface of steel plate, lower surface of steel plate 5.Boring direction is horizontal direction, hole
Deep 150mm, aperture 5mm.500mm × 500mm steel billet temperature recorder placed cavity 8, steel plate temperature are cut into 1 tail portion side of steel plate
It spends 8 bottom of recorder placed cavity and welds 10mm thick steel plate, top installs steel steel billet temperature recorder placed cavity upper cover plate 9, ruler additional
Very little is 600mm × 600mm.Steel billet temperature recorder 7 is placed on 8 middle part of steel billet temperature recorder placed cavity, and surrounding fills fire resisting
Material, 7 terminals of steel billet temperature recorder are horizontal coaxial with steel billet temperature recorder placed cavity areole 10.In 1 side wall of steel plate
The fixed steel pipe 11 of thermocouple is welded in 6 passage path of thermocouple, for fixing thermocouple 6.6 one end junction steel plate temperature of thermocouple
Recorder 7, the other end sequentially pass through the fixed steel pipe 11 of steel billet temperature recorder placed cavity areole 10, thermocouple, are inserted into steel plate
In head temperature measuring point 3, steel plate tail temperature measuring point 4 and steel plate side temperature measuring point 2 drill.
Embodiment two, the present embodiment provides a kind of steel plate quenching cooling rates of steel plate roll-type quenching cooling rate test method of the present invention
Test implementation process, as shown in Fig. 2, illustrating implementation process for selecting 300mm thickness, 2500mm wide, 8m long steel plate.Test
Steel plate after processing is completed, opens steel billet temperature recorder placed cavity upper cover plate 9, steel plate 1 is together with steel billet temperature recorder 7, thermoelectricity
After even 6 are placed into heat 12 hours in heat treatment heating furnace 12 together, steel plate 1 is together with steel billet temperature recorder 7, thermocouple 6 one
With being placed on rollgang 14, steel billet temperature recorder placed cavity upper cover plate 9 is covered.Later, steel plate 1 executes steel plate acceleration and deceleration
Quenching process 19: steel plate 1 is with 30m/min initial velocity, 0.0005m/s2Acceleration is mobile to roller quenching machine 13, roller quenching machine
High pressure section nozzle 18 is with 0.8MPa pressure, 3500m3/ h water flow quenches cooling metal sheets 1, quenches when 1 tail portion of steel plate is moved to roll-type
Behind 15 end of lighter high pressure section, 1 speed of steel plate reduces to 9m/min, and constant speed is mobile to roller quenching machine low pressure stage 16, and roll-type is quenched
Lighter high pressure section nozzle 18 is closed.When 1 tail portion of steel plate enters roller quenching machine low pressure stage 16, steel plate 1 executes steel plate swing and quenches
Fiery process 20: steel plate 1 is mobile to 13 tail portion of roller quenching machine with 9m/min constant-velocity, and when moving distance is 4m, steel plate 1 stops
Only and reversely with 9m/min constant-velocity to the mobile 4m in 13 head of roller quenching machine, repeatedly until when steel plate 1 swings quenching
Between be 45min, steel plate 1 is mobile to 13 tail portion of roller quenching machine with 9m/min constant-velocity, until steel plate 1 is fully removed roll-type
Quenching press 13.When 1 head of steel plate enters roller quenching machine low pressure stage 16, roller quenching machine low pressure stage nozzle 17 is pressed with 0.5MPa
Power, 3600m3/ h water flow quenches cooling metal sheets 1.When 1 tail portion of steel plate enters roller quenching machine low pressure stage 16, steel plate 1 is executed
Surface of steel plate jet parameters dynamic adjustment process 21: when it is 15min that steel plate 1, which swings the cool time, roller quenching machine low pressure stage
17 water flow of nozzle is down to 2400m3/h；When it is 22.5min that steel plate 1, which swings the cool time, roller quenching machine low pressure stage nozzle
17 water flows are down to 1800m3/h；When it is 30min that steel plate 1, which swings the cool time, 17 water flow of roller quenching machine low pressure stage nozzle
Amount is down to 1200m3/h；When it is 45min that steel plate 1, which swings the cool time, roller quenching machine low pressure stage nozzle 17 is closed.
1 roll-type of steel plate quenches in cooling rate test process, and steel billet temperature recorder 7 works always, records steel plate 1 in real time and respectively surveys
Warm spot temperature.After steel plate 1 transports roller quenching machine 13, steel billet temperature recorder 7 is taken out, export 1 hardening heat of steel plate note
Record data.
Claims (2)
1. a kind of steel plate roll-type quenches cooling rate test method, which is characterized in that temperature measuring point covers steel plate difference temperature drop region, steel plate
Moisture recorder is embedded in super-thick steel plate；Steel plate roll-type quench cooling rate test include steel plate acceleration and deceleration quenching, steel plate swing quenching,
Surface of steel plate jet parameters dynamic adjusts three processes；
(1) steel plate acceleration and deceleration quenching process: after steel plate reaches heating temperature and transports heat-treatment furnace, according to the calculating air-cooled temperature of steel plate
Curve is dropped, 0.0001~0.001m/s is selected2Acceleration accelerates into roller quenching machine high pressure section by rollgang, when steel plate tail
By roller quenching machine high pressure section and when leaving, steel plate speed reduces to the swing speed of setting in portion；
(2) steel plate swings quenching process: steel plate tail leaves roller quenching machine high pressure section, steel plate is decelerated to setting swing speed
Afterwards, basis steel sheet length is set in the swinging distance of roller quenching machine low pressure stage, steel plate swing within the scope of swinging distance
Quenching cooling；
(3) surface of steel plate jet parameters dynamic adjustment process: according to setting steel plate in roller quenching machine low pressure stage duration of oscillation and
Steel plate quenching process surface-center portion heat exchange/heat conducting law adjusts each water discharge nozzle of roller quenching machine low pressure stage: duration of oscillation
When by 1/3, water flow is down to setting water flow 2/3；When duration of oscillation passes through 1/2, water flow is down to setting water flow 1/2；
When duration of oscillation passes through 2/3, water flow is down to setting water flow 1/3；Steel plate reaches cooling time in roller quenching machine low pressure stage
When duration of oscillation, each nozzle of roller quenching machine low pressure stage is closed, and steel plate is driven out to quenching press by swing speed.
2. the steel plate roll-type of claim 1 the method application quenches cooling rate test device, which is characterized in that including thermocouple and
Steel billet temperature recorder, head section, tail portion section and the side section of steel plate are respectively arranged temperature measuring point, and at each temperature measuring point
Thermocouple one end is placed in drilling；Steel plate cuts pore-forming close to edge any position, and bottom hole welding steel forms vallecular cavity, temperature
It spends recorder to embed in chamber, top of chamber welds removable cover, and cavity wall is close to one side opening of steel plate edge；The thermocouple other end
The stainless steel tube laterally welded across steel plate passes through cavity wall side opening and connect with moisture recorder；The temperature measuring point chooses steel plate head
Portion's section it is wide to upper surface of steel plate at center, lower surface of steel plate, away from 1/4 thickness of upper surface of steel plate, it is thick away from lower surface of steel plate 1/4
At degree, center portion totally 5 temperature measuring points, choose steel plate tail section it is wide to upper surface of steel plate, lower surface of steel plate at center, away from steel plate
At 1/4 thickness of surface, away from 1/4 thickness of lower surface of steel plate, center portion totally 5 temperature measuring points, choose in steel plate side section length direction
Upper surface of steel plate at the heart, lower surface of steel plate, away from 1/4 thickness of upper surface of steel plate, away from 1/4 thickness of lower surface of steel plate, center portion totally 5
A temperature measuring point.
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Application publication date: 20181009 Assignee: XINYU IRON & STEEL Co.,Ltd. Assignor: Northeastern University Contract record no.: X2020210000039 Denomination of invention: A test method and device for cooling rate of steel plate roller quenching Granted publication date: 20190809 License type: Common License Record date: 20201228 |
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