CN109794517A - A kind of strain controlling technique of Direct Rolling square billet - Google Patents
A kind of strain controlling technique of Direct Rolling square billet Download PDFInfo
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- CN109794517A CN109794517A CN201811651322.7A CN201811651322A CN109794517A CN 109794517 A CN109794517 A CN 109794517A CN 201811651322 A CN201811651322 A CN 201811651322A CN 109794517 A CN109794517 A CN 109794517A
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Abstract
A kind of strain controlling technique of Direct Rolling square billet, belongs to long profiles technology field.Square billet strain deformation control technique after induction heating, temperature equalizing furnace concurrent heating, samming hole mode samming, cooling by the acceleration before rolling per pass, the temperature control at billet surface center enters mill milling at 750~1200 DEG C；To the detection numerical value of continuous casting square billet samming rear surface temperature, it is calculated by mathematical model, setting accelerates cooling pressure medium, so that the centre of surface temperature of square billet and core is generated biggish 50~400 DEG C of temperature gradient, the strain at square billet center is improved by controlled rolling.This advantage is that can the loose of soldering square billet core, shrinkage cavity and crack defect, improve the comprehensive quality of rolled steel.
Description
Technical field
The invention belongs to steel technology fields.Relate generally to a kind of strain controlling side of Direct Rolling square billet
Method, the rolling suitable for square billet.
Background technique
Continuous casting square billet goes out conticaster after cutting off, due to the heat convection and rollgang of hyperthermia radiation heat dissipation and air
Conduction heat transfer, square billet is in the thermo parameters method that gradually decreases from core to surface temperature, the deformation in corresponding square billet cross section
The distribution of ladder from small to large is presented in drag from inside to outside.In square billet by modes such as induction heating, temperature equalizing furnace concurrent heating, samming holes
During Direct Rolling after samming, the cross section temperature field of square billet is intended to be uniformly distributed.
Rolled piece in rolling, due between rolled piece and roll there are frictional force, the inhomogeneities in square billet cross section temperature field,
Cause square billet in deformation, what the distortional stress on rolled piece profile height direction was unevenly distributed, so that metal flow is distributed
It is also non-uniform.During normal production, surface temperature is higher than core temperature or slightly below core temperature when square billet goes out heating furnace,
Temperature difference is within ± 20 DEG C, and when strain deformation cannot penetrate into rolled piece center well, therefore, the core defect of square billet is difficult
To eliminate during the rolling process.Rolled in opposite rolling with the finish rolling stage, the surface of breaking down stage square billet and core temperature difference
It influences maximum.
Strain controlling technique is exactly that the temperature gradient for increasing square billet surface and core is realized by way of accelerating cooling, is drawn
It plays resistance of deformation and ladder distribution is presented, is i.e. surface deformation drag is big, and hardly possible deformation, core resistance of deformation is small, mutability, to increase
Infiltration of the deformation from surface to center improves lumber recovery to reduce rolled piece internal flaw.
Conventional differential temperature milling method, such as: a kind of AlZnMgCu line aluminium alloy of patent of invention publication No. CN107931337A
The differential temperature milling method of slab is the control method for rolling for describing heavy slab；Invention patent publication number 101451182 is a kind of new
Ingot-material rolling method is to describe steel ingot before open rolling to 6~12 minutes temprature control methods of temperature.
The method that the present invention describes core strain during raising billet rolling.
Summary of the invention
The purpose of the present invention is to provide a kind of strain controlling techniques of Direct Rolling square billet, during Direct Rolling,
Square billet limited by equipment force-power parameter, is deformed and cannot be penetrated into core well, formed when so as to cause billet continuous casting in
Portion's defect, if the defects of crackle, loose, shrinkage cavity, cannot be eliminated well, so that lumber recovery declines, the object of the present invention is to provide
One kind is made in billet rolling deformation process, the technique that core strain increases by accelerating cooling to make square billet surface cooling.Strain control
Technique processed can solve the rolling equipment force-power parameter routinely produced it is smaller, deformation cannot good the problem of penetrating into core.
Process flow of the invention includes: continuously casting → temperature detection → concurrent heating samming → temperature detection → square billet surface
Accelerate cooling → controlled rolling → temperature detection → feedback control；It is characterized in that, the technical parameter controlled in process is as follows:
1) it is strained after the modes sammings such as induction heating, temperature equalizing furnace concurrent heating, samming hole suitable for the square billet of Direct Rolling
Deformation control technique is shown in attached drawing 1.It is cooling by acceleration before rolling per pass, the temperature control at billet surface center 750~
1200 DEG C enter mill milling；
2) accelerated cooling device is installed before and after milling train, for reducing the surface temperature of square billet, formed square billet surface and
The temperature gradient of the increase of core is shown in attached drawing 1.The entrance installation cooling system of milling train is the open rolling in order to control this passage square billet
Temperature, the outlet installation cooling system of milling train are the start rolling temperatures in order to control lower a time.Cooling device can be using water, pressure
The cooling square billet of mixture of contracting air, air sum, adjusts the cooling capacity to square billet by the pressure of cooling medium, flow,
Nozzle exit pressure is in 0.01~2.00MPa.Other than cooling capacity is adjustable, position is adjustable in the certain range in milling train two sides,
0.01~2.00m of adjustable range.According to the surface temperature distribution situation of square billet, centre of surface temperature is high, corner temperature is low, uses
Edge-masking guarantees that center intensity of cooling is high, corner intensity of cooling is low, reaches surface plane Temperature Distribution within ± 20 DEG C,
Good condition is provided for the operation of rolling.
It is cooling by the acceleration on square billet surface, the temperature gap of the centre of surface and core that can make square billet reaches 50~
400 DEG C, in the subsequent operation of rolling improve core strain value, refine core grain structure provide condition, can also weld
Close the loose of square billet core, shrinkage cavity and crack defect.
3) position in inlet of rolling mill and outlet two sides equipped with square billet and temperature detector, are shown in attached drawing 1.The entrance of milling train is pacified
Dress temperature detector is the preceding temperature of rolling in order to detect this passage square billet, and the outlet installation detector of milling train is to detect and originally arrive
This square billet rolls rear temperature, and the start rolling temperature as lower a time.Detector can move 0.01 in the rolling direction~
2.00m avoids influence of the cooling water to temperature detection for meeting the coefficient of heat transfer testing requirements of different steel grades.Using high-precision
The temperature measurement on-line device of degree, combines with the mathematical model of Temperature calculating, and temp measuring system is enabled to guarantee the essence of test simultaneously
Degree and timeliness and the precision and timeliness of forecast provide accurate reference to work out parameter and the implementation of cooling technique.Side
The implementation procedure of base strain controlling is as follows:
(1) prediction in square billet cross section temperature field is carried out according to the hot resume after billet continuous casting.Strain controlling prediction model
Include: square billet temperature prediction model before open rolling, in the operation of rolling rolled piece strain variation prediction model.
(2) cogging data acquire.Periodic samples are carried out to the measured temperature of continuous casting square billet, temperature sampling frequency is 20
Secondary/second is analyzed signal feeding computer by PLC, to judge whether can be with split rolling method.
(3) temperature data pre-processes.It is not to be exceeded 20% according to adjacent moment sample temperature amplitude of variation, if when current
The sample temperature at quarter and the sample temperature of previous moment differ by more than 20%, then do not record the principle of the sample temperature at current time
Carry out data prediction；Then in seconds, the multi-group data of synchronization is averaged, finally obtain its continuous casting square billet from
Temperature distribution history of the head to tail portion.
(4) mode of movement judgement and execution.The mode of movement of square billet is judged according to temperature curve using computer；According to existing
There is the temperature distribution state of square billet and the requirement of strain controlling is combined to formulate heating or concurrent heating technological parameter.
(5) cooling control is executed.Data sampling, temperature sampling are carried out to the actual temperature measured value after continuous casting square billet concurrent heating
Frequency is 20 times/second, then analyzes signal feeding computer by PLC, finally has computer to formulate cooling technique ginseng
It counts and executes.
(6) strain controlling rolls.Controlled rolling is carried out to the square billet of composite strain controlled rolling.
4) present invention is suitable for producing spiral, high-speed rod, profile and strip.
Compared with existing billet rolling deformation technology, the present invention has the advantage that
1) square billet makes square billet that larger ladder be presented from surface to core by specific cooling technique before carrying out roughing
Temperature Distribution, resistance of deformation are also distributed in ladder accordingly, and surface resistivity is big, and core drag is small, so that square billet core is goed deep into deformation
Portion, deformation uniformly, obtains that tissue, performance are uniform when billet rolling, the product of few defect.
2) due to accelerating the cooling implementation on surface, so that the part of square billet adjacent surface is rolled in lower temperature, it can
With crystal grain refinement, excellent surface property is obtained.
3) position of cooling device is adjustable, and the time of milling train is entered after adjustable square billet is cooling, ensure that rolling temperature
The accuracy of point.
4) technique is suitable for the square billet cheated by induction heating, temperature equalizing furnace concurrent heating, samming, increases continuous casting and roller
The flexibility dispatched between sequence reduces the requirement being connected between process, reduces the difficulty of integration production.
Detailed description of the invention
Fig. 1 is the square billet strain controlling process flow chart of Direct Rolling, be suitable for by induction heating, temperature equalizing furnace concurrent heating,
The square billet in samming hole.
Fig. 2 is with and without the square billet section temperature distribution map under strain controlling technique.0 point is in square billet cross section
The heart shows the Temperature Distribution of square billet cross section a quarter area.
Fig. 3 equivalent strain value position view avoids the distance of square billet 300mm end to end.
Fig. 4 is the strain figure on square billet surface and core under two kinds of techniques in the operation of rolling.
Specific embodiment
The strain of steel core can be improved by controlled rolling using square billet strain controlling technique of the present invention
Amount, therefore improve the comprehensive quality of rolled steel.
A specific embodiment of the invention is described further below.
1) before the square billet that conticaster provides enters rollgang, square billet surface temperature should be first detected, is surveyed according to temperature measuring equipment
Concurrent heating and mode of movement of the temperature data selection square billet obtained between continuous casting and steel rolling process: induction heating, soaking pit concurrent heating
Or samming cheats concurrent heating, and final target temperature is determined according to the requirement of strain controlling, formulates heating or concurrent heating system.
2) in square billet before milling train 1 meter apart from when, formulate cooling technique according to temperature measurement on-line data, open cooling dress
It sets.
3) after the completion of cooling, before it will roll, the temperature data that is measured according to the temperature measuring equipment near milling train entrance
Judge whether square billet temperature has reached the requirement of strain deformation target.If it does not meet the requirements, mobile cooling device, again to square billet
It is cooled down, until meeting the requirements.
4) it is controlled according to the data of the temperature measuring equipment detection on single pass roller repairing device as next piece of square billet temperature
Feedback, self study foundation.
5) real-time prediction carried out to the strain regime of every a time rolled piece, and with actually detected metallographic structure and mechanical property
It can compare.
The present embodiment uses the rectangular continuous casting billet of HRB400 of 150 × 150mm, and Fig. 2 is set forth using strain controlling work
Skill square billet temperature distribution state after cooling, the temperature distribution state that square billet temperature is 1200 DEG C of sammings.Equivalent strain value
Position is as shown in Figure 3.After Fig. 4 shows rolled piece by preceding 5 frame roughing passage, the equivalent strain of I, II two lines position in Fig. 3
Comparison diagram, in the range of away from square billet center 20mm, equivalent strain improves 10%.As seen from Figure 4, square billet is in roughing rank
Section, the core of square billet and the position close to core, equivalent strain are bigger than tradition rolling.Illustrate the core temperature due to square billet
Height, surface temperature is relatively low, and deformation compares traditional rolling deformation and is easier to penetrate into core, so that the strain for increasing core becomes
Shape.
The mechanical property of corresponding steel is shown in Table 1.
| Serial number | Rolling mode | Surface start rolling temperature, DEG C | Yield strength, MPa | Tensile strength, MPa | Elongation percentage, % |
| 1 | Conventional samming | 1200 | 423 | 562 | 26 |
| 2 | Strain controlling | 1100 | 430 | 567 | 26 |
| 3 | Strain controlling | 1000 | 438 | 572 | 27 |
| 4 | Strain controlling | 900 | 450 | 580 | 29 |
Claims (4)
1. a kind of strain controlling technique of Direct Rolling square billet, process flow includes: that continuously casting → temperature detection → concurrent heating is equal
Temperature → temperature detection → square billet surface accelerates cooling → controlled rolling → temperature detection → feedback control；It is characterized in that, in work
The technical parameter controlled in skill is as follows:
(1) square billet keeps the temperature of centre of surface to be 750~1200 DEG C and enters mill milling, the table of square billet by accelerating cooling
The temperature gap of face center and core reaches 50~400 DEG C；
(2) accelerated cooling device is installed before and after milling train, cooling device uses the mixture of water, compressed air, air and water
Cooling square billet adjusts the cooling capacity to square billet by the pressure of cooling medium, flow, and nozzle exit pressure is in 0.01~2.00MPa；
Other than cooling capacity is adjustable, position is adjustable in the certain range in milling train two sides, 0.01~2.00m of adjustable range；Using
Edge-masking guarantees that center intensity of cooling is high, corner intensity of cooling is low, reaches surface plane Temperature Distribution within ± 20 DEG C；
Cooling by the acceleration on square billet surface, the temperature gap of the centre of surface and core that make square billet reaches 50~400 DEG C, after being
The strain value that core is improved in the continuous operation of rolling, the grain structure for refining core provide condition, soldering square billet core it is loose,
Shrinkage cavity and crack defect；
(3) position in inlet of rolling mill and outlet two sides equipped with square billet and temperature detector, detector move in the rolling direction
0.01~2.00m avoids influence of the cooling water to temperature detection for meeting the coefficient of heat transfer testing requirements of different steel grades；It adopts
It with high-precision temperature measurement on-line device, is combined with the mathematical model of Temperature calculating, temp measuring system is enabled to guarantee to survey simultaneously
The precision and timeliness of examination and the precision and timeliness of forecast provide accurate ginseng to work out parameter and the implementation of cooling technique
It examines.
2. strain controlling technique according to claim 1, which is characterized in that the implementation procedure of square billet strain controlling is as follows:
(1) prediction in square billet cross section temperature field is carried out according to the hot resume after billet continuous casting, strain controlling prediction model includes:
The prediction model of rolled piece strain variation in square billet temperature prediction model, the operation of rolling before open rolling；
(2) cogging data acquire: periodic samples are carried out to the measured temperature of continuous casting square billet, temperature sampling frequency is 20 times/
Second, signal feeding computer is analyzed by PLC, to judge whether energy split rolling method；
(3) temperature data pre-processes: 20% is not to be exceeded according to adjacent moment sample temperature amplitude of variation, when adopting for current time
The sample temperature of sample temperature and previous moment differs by more than 20%, then the principle for not recording the sample temperature at current time is counted
Data preprocess；Then in seconds, the multi-group data of synchronization is averaged, finally obtain its continuous casting square billet from head to
The temperature distribution history of tail portion；
(4) mode of movement of square billet mode of movement judgement and execution: is judged according to temperature curve using computer；According to existing side
The temperature distribution state of base simultaneously combines the requirement of strain controlling to formulate heating or concurrent heating technological parameter；
(5) it executes cooling control: data sampling, temperature sampling frequency is carried out to the actual temperature measured value after continuous casting square billet concurrent heating
For 20 times/second, then signal feeding computer is analyzed by PLC, finally has computer to formulate cooling technique parameter simultaneously
It executes；
(6) strain controlling rolls: carrying out controlled rolling to the square billet of composite strain controlled rolling.
3. strain controlling technique according to claim 1 or 2, which is characterized in that the steel billet for being suitble to rolling is square billet.
4. strain controlling technique according to claim 3, which is characterized in that be suitble to rolling product include: spiral,
High-speed rod, profile or band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811651322.7A CN109794517B (en) | 2018-12-31 | 2018-12-31 | Strain control process for directly rolling square billet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811651322.7A CN109794517B (en) | 2018-12-31 | 2018-12-31 | Strain control process for directly rolling square billet |
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| CN109794517B CN109794517B (en) | 2020-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110711785A (en) * | 2019-10-10 | 2020-01-21 | 中冶南方连铸技术工程有限责任公司 | Method and system for controlling temperature of fixed-length casting blank before rolling |
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| CN1978674A (en) * | 2005-12-07 | 2007-06-13 | 首钢总公司 | Rolling method for solving continuous cast billet shrinkagehole segregation |
| JP2013133503A (en) * | 2011-12-27 | 2013-07-08 | Jfe Steel Corp | Method of producing grain-oriented electromagnetic steel sheet |
| CN103556080A (en) * | 2013-10-24 | 2014-02-05 | 钢铁研究总院 | Mechanical property control method for directly rolling long profiles |
| CN105618481A (en) * | 2016-03-15 | 2016-06-01 | 石家庄钢铁有限责任公司 | Equipment and process for conducting protruding roller rolling through continuous casting slab waste heat |
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2018
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Patent Citations (4)
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| CN1978674A (en) * | 2005-12-07 | 2007-06-13 | 首钢总公司 | Rolling method for solving continuous cast billet shrinkagehole segregation |
| JP2013133503A (en) * | 2011-12-27 | 2013-07-08 | Jfe Steel Corp | Method of producing grain-oriented electromagnetic steel sheet |
| CN103556080A (en) * | 2013-10-24 | 2014-02-05 | 钢铁研究总院 | Mechanical property control method for directly rolling long profiles |
| CN105618481A (en) * | 2016-03-15 | 2016-06-01 | 石家庄钢铁有限责任公司 | Equipment and process for conducting protruding roller rolling through continuous casting slab waste heat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110711785A (en) * | 2019-10-10 | 2020-01-21 | 中冶南方连铸技术工程有限责任公司 | Method and system for controlling temperature of fixed-length casting blank before rolling |
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