CN106480306A - In laminar flow sub-sectional cooling technique, second segment cools down the control method of precision - Google Patents
In laminar flow sub-sectional cooling technique, second segment cools down the control method of precision Download PDFInfo
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Abstract
The present invention provides the control method that second segment in a kind of laminar flow sub-sectional cooling technique cools down precision.The method comprising the steps of：Draw the continuous cooling transformation (CCT) curve of two kinds of component system；Determine the austenite of two kinds of compositions, ferrite, pearlite, bainite, Martensite temperature transformation range, sub-sectional cooling " coiling technique window " scope；Determine that target temperature, the method for control speed for closely at the uniform velocity rolling soon are batched in sub-sectional cooling processing route, air cooling target temperature and air cooling object time, second segment cooldown rate scope, the second segment cooling of two kinds of compositions in " coiling technique window "；Calculate two kinds of fixing initial valve locations of composition second segment cooling；Two kinds of composition second segment cooling closed-loop control systems of design, cooling control mode and the corresponding cooling control routine of formulation；Detect to rolling the performance of latter two composition, tissue, cooling control parameter is solidified or is revised.The present invention can be organized, the hot-rolled dual-phase steel product of function admirable.
Description
Technical field：
The present invention relates to second segment cools down the control method of precision in a kind of laminar flow sub-sectional cooling technique, belong to the laminar flow sub-sectional cooling technical field of Ferrous Metallurgy class.
Background technology：
The advantages of dual phase steel is with its good strong plasticity proportioning and excellent forming property has obtained the extensive concern of people, and its product can be widely applied to the moving link of automobile and safety member, such as wheel, chassis, bumper etc..Hot direct rolling process produces dual phase steel, it is not necessary to additional heat-treatment and annealing device, reduces man-hour and energy consumption, low cost.Its metallurgical control principle is：（1）Enough ferrites need to be formed；（2）Suppression pearlite and bainite are produced；（3）Remaining austenite is completely transformed into martensite.Corresponding difficult point is：（1）According to the feature of its austenite continuous cooling transformation, complicated laminar flow cooling technology is needed, general using the cooling of laminar flow segmented, technology stability has high demands；（2）For sub-sectional cooling technique, advanced cooling device, corresponding instrumentation and model-controlled system etc. is needed.So-called sub-sectional cooling refers to for cooling control to divide into two regions of leading portion and back segment, after finish to gauge, strip enters first paragraph cooling zone and carries out water-cooled, reach the cold medium temperature of certain layer, then air cooling is for a period of time, entering back into second segment cooling zone carries out a kind of complexity cooling technique that water-cooled reaches the target coiling temperature of requirement, pass through first paragraph water-cooled+air cooling+second segment water-cooled, control finished strip only to obtain the cooling technique of ferrite+martensite duplex structure.At present, some hot rolling producing lines have had been provided with the laminar cooling system of sub-sectional cooling requirement, but all there are different problems in control methods and model control accuracy, as second segment cooling air cooling time, cooling path arranges unreasonable, cooling curve enters pearlite, bainite transformation area, laminar flow does not possess the model-controlled system of complicated cooling technique or systemic-function imperfection, conventional mill increasing speed rolling process second segment cooling water inflow increases total length fluctuation strip total length tissue with speed, performance is uneven etc., these all have impact on the exploitation of hot-rolled dual-phase steel and marketing, therefore, the control method for being particularly second segment cooling precision to sub-sectional cooling is needed to be optimized and innovate.
Content of the invention
The purpose of the present invention is to provide, for above-mentioned problem, the control method that second segment in a kind of laminar flow sub-sectional cooling technique cools down precision, mainly solves the middle temperature of Si-Mn-Cr-Mo system（500-600℃）With Si-Mn-Nb-Ti system low temperature（100-250℃）Batch hot-rolled dual-phase steel laminar flow sub-sectional cooling（First paragraph water-cooled+air cooling+second segment water-cooled）The second segment cooling design effectively in path and the problem of implementation of model control method in technique, to respectively obtain the hot-rolled dual-phase steel product of tissue, function admirable.
Above-mentioned purpose is achieved through the following technical solutions：
In laminar flow sub-sectional cooling technique, second segment cools down the control method of precision, and the method comprises the steps：
（1）Draw two kinds of component system（Si-Mn-Cr-Mo system, Si-Mn-Nb-Ti system）The continuous cooling transformation (CCT) curve of hot-rolled dual-phase steel（CCT curve）；
（2）Determine the austenite of two kinds of compositions, ferrite, pearlite, bainite, Martensite temperature transformation range；
（3）Determine sub-sectional cooling " coiling technique window " scope of two kinds of compositions；
（4）The sub-sectional cooling processing route of two kinds of compositions is determined in " coiling technique window "；
（5）Determine air cooling target temperature and the air cooling object time of two kinds of compositions；
（6）Determine the second segment cooldown rate scope of two kinds of compositions；
（7）Determine that target temperature is batched in two kinds of composition second segment coolings；
（8）The method for control speed that two kinds of compositions closely at the uniform velocity roll soon；
（9）Two kinds of fixing initial valve locations of composition second segment cooling are calculated according to step 5 air cooling object time, step 8 mill speed；
（10）Two kinds of composition second segments are designed according to step 5-9 and cools down closed-loop control system；
（11）Target temperature, step 10 closed-loop control system composition, two kinds of composition cooling control modes of design and the corresponding cooling control routine of formulation are batched according to step 7；
（12）Second segment cools down feedforward control；
（13）Second segment cools down feedback control；
（14）Feedback control goes temperature vacation point to process；
（15）Detect to rolling the performance of latter two composition, tissue, cooling control parameter is solidified or is revised.
In described laminar flow sub-sectional cooling technique, second segment cools down the control method of precision, step（1）Described in two kinds of component system of drafting（Si-Mn-Cr-Mo system, Si-Mn-Nb-Ti system）The continuous cooling transformation (CCT) curve of hot-rolled dual-phase steel（CCT curve）Method of operating be：Using Gleeble3500 hot modeling test machine, carry out two kinds of component system（Si-Mn-Cr-Mo system, Si-Mn-Nb-Ti system）Hot-rolled dual-phase steel thermal modeling test, determines its austenite Continuous Cooling Transformation Curve（CCT curve）.
In described laminar flow sub-sectional cooling technique, second segment cools down the control method of precision, step（6）Described in two kinds of compositions second segment cooldown rate scope：Si-Mn-Cr-Mo system cooling rate 20-30 DEG C/s, Si-Mn-Nb-Ti system cooling rate 50-60 DEG C/s.
In described laminar flow sub-sectional cooling technique, second segment cools down the control method of precision, step（7）Described in second segment cooling batch target temperature：Si-Mn-Cr-Mo system coiling temperature scope 500-600 DEG C, takes 550 DEG C of desired value, Si-Mn-Nb-Ti system coiling temperature scope 100-250 DEG C.
In described laminar flow sub-sectional cooling technique, second segment cools down the control method of precision, step（8）Described in the method for control speed that closely at the uniform velocity rolls soon of two kinds of compositions：Hot-rolled dual-phase steel thickness range is 3.0-4.8mm, 880 DEG C of Si-Mn-Cr-Mo system finish to gauge target temperature, 830 DEG C of Si-Mn-Nb-Ti system target temperature, when finishing speeds model is calculated, on the basis of respective 3.0mm thickness, maximum threading speed is calculated using the method for thinning workpiece thickness speed governing, interstand cooling water control temperature.
Beneficial effect：
In " the coiling technique window " of two kinds of component system dual phase steels, method of air cooling in the region+second segment water-cooled using independent cooling path+coiling temperature design is developed；The problem for causing total length performance uneven is gradually increased for second segment cooling water inflow in former technique increasing speed rolling, develops the method for control speed for closely at the uniform velocity rolling soon；The feature for requiring for air cooling time and closely at the uniform velocity rolling, the method for developing the fixing starting valve location of second segment cooling, it is not required to velocity variations and changes；Control for second segment cooldown rate is required, on the configuration mode of existing cooling manifold, develop the processing method that the false point of temperature detection is removed in thick cold collector, the setting of cold sperm collector and the feedback, and feedback control procedure for be different from the cooling of traditional back segment.
Description of the drawings
Accompanying drawing 1a is the austenite Continuous Cooling Transformation Curve schematic diagram of Si-Mn-Cr-Mo system；
Accompanying drawing 1b is the austenite Continuous Cooling Transformation Curve schematic diagram of Si-Mn-Nb-Ti system；
Accompanying drawing 2 is laminar flow second segment cooling control system layout drawing.
Specific embodiment
With reference to specific embodiment, the present invention is further elucidated with, it should be understood that following specific embodiments are only illustrative of the invention and is not intended to limit the scope of the invention.
The invention discloses second segment cools down the control method of precision in a kind of laminar flow sub-sectional cooling technique, comprise the following steps：
1）Using Gleeble3500 hot modeling test machine, carry out two kinds of component system（Si-Mn-Cr-Mo system, Si-Mn-Nb-Ti system）Hot-rolled dual-phase steel thermal modeling test, determines its austenite Continuous Cooling Transformation Curve（CCT curve）, see accompanying drawing 1；
2）In respective CCT curve, the austenite of two kinds of compositions, ferrite, pearlite, bainite, Martensite temperature transformation range is determined.Can will become apparent from from accompanying drawing 1：（1）Si-Mn-Cr-Mo system（Accompanying drawing 1a）Dual phase steel perlitic transformation area moves to right strongly, and bainite transformation area right-hand member is sealed, between ferrite and bainite transformation area, have vertical temperature difference larger austenite meta-stable area；（2）Si-Mn-Nb-Ti system（Accompanying drawing 1b）Dual phase steel perlitic transformation area moves to right not substantially, is linked together with pearlite, bainite transformation area on the right side of ferritic transformation area in the vertical；
3）Determine sub-sectional cooling " coiling technique window " scope of two kinds of compositions, i.e. the temperature of cooling procedure, time graph can not all enter into pearlite, bainite transformation area, " can only walk " in ferrite, austenite, martensite range, to obtain the duplex structure of ferrite+martensite；
4）The sub-sectional cooling processing route of two kinds of compositions is determined in " coiling technique window ".Can be seen that from accompanying drawing 1：（1）Si-Mn-Cr-Mo system（Accompanying drawing 1a）After dual phase steel " finish to gauge " shuts out, through first paragraph water-cooled（Enter ferrite area）The air cooling of+one long period（Generation ferritic transformation）+ second segment water-cooled（Cooling is ended near martensitic regions, forms martensite in subsequent process air cooler）, to obtain ferrite+martensitic structure；（2）Si-Mn-Nb-Ti system（Accompanying drawing 1b）After dual phase steel " finish to gauge " shuts out, first paragraph water-cooled is first passed through（Enter ferrite area）The air cooling of+one short period（Generation ferritic transformation）The quick water-cooled of+second segment（Cooling curve avoids pearlite, Bainite Region, quickly enters martensitic regions）, to obtain ferrite+martensitic structure；
5）（1）The purpose of dual phase steel sub-sectional cooling first paragraph water-cooled is the " nose " temperature that the strip after making finish to gauge enters ferritic transformation C curve at short notice, so that residence time is most long in the ferrite area when ensureing air cooling, therefore the temperature near nose is set to air cooling target temperature；（2）During the purpose of air cooling is guarantee Slow cooling, a certain amount of ferritic structure is formed in ferritic transformation area, and before cooling curve reaches perlitic transformation, control second segment water-cooled slope, ensure that second segment cooling curve does not enter pearlite, bainite transformation area, the first paragraph water-cooled end time to second segment water-cooled time started is set to the air cooling object time.As can be seen that Si-Mn-Cr-Mo system dual phase steel is wider due to " coiling technique window " from accompanying drawing 1, the air cooling object time is longer, and " window " of Si-Mn-Nb-Ti system is narrower, and the air cooling object time is shorter；
6）（1）As Si-Mn-Cr-Mo system " coiling technique window " is wider, second segment cooldown rate slowly can control, and cooling rate 20-30 DEG C/s can meet requirement；（2）Si-Mn-Nb-Ti system window is narrower, it is necessary to carries out intensive cooling at short notice and can just avoid pearlite, bainite transformation area, cooling rate 50-60 DEG C/s can be only achieved requirement；
7）（1）Si-Mn-Cr-Mo system（Accompanying drawing 1a）Can form martensitic structure during Slow cooling, coiling temperature scope 500-600 DEG C, take 550 DEG C of desired value；（2）Si-Mn-Nb-Ti system（Accompanying drawing 1b）Must be cooled to below martensite point temperature, and the self tempering of ferrite failure and martensite will be prevented, coiling temperature scope 100-250 DEG C, take 180 DEG C of desired value；
8）Hot-rolled dual-phase steel thickness range is 3.0-4.8mm, 880 DEG C of Si-Mn-Cr-Mo system finish to gauge target temperature, 830 DEG C of Si-Mn-Nb-Ti system target temperature, when finishing speeds model is calculated, on the basis of respective 3.0mm thickness, maximum threading speed is calculated using the method for thinning workpiece thickness speed governing, interstand cooling water control temperature.Specially：Thickness range routine workpiece thickness 40mm, the present invention adopt minimum rolled thickness 30mm, while each group interstand cooling water is calculated the threading speed under the finishing temperature, i.e. V3.0 threading by maximum minable water yield.Remaining thickness is with 0.3mm as a group away from benchmark threading speed is designed as the following formula：VThreading=V3.0 Threading- 0.3n, n=0,1,2,3,4,5,6.Due to finish rolling high speed threading, in Acceleration Control, 1 adds, 2 accelerations are respectively 0.001m/s2,0.002m/s2, and the 1/15 ~ 1/10 of only normal strip acceleration；
9）Required according to respective air cooling object time s and specification mill speed VThreadingCalculate two kinds of composition second segments cooling starting valve location, i.e. air cooling length L=VThreading* that of s is arranged in a row pipe and cools down initial valve as second segment.As the mill speed design of strip in step 8 is similar at the uniform velocity, this initial valve location is not required to change with air cooling time and mill speed as traditional increasing speed rolling（Second segment cooling initial valve location is secured）, total length inhomogeneous cooling is even to bring uneven microstructure to cause second segment to cool down；
10）By accompanying drawing 2,（1）Second segment cooling manifold device is made up of 5 groups of intensive slightly cold collectors, 2 groups of cold sperm collectors, instrumentation by the cold middle pyrometer of layer, batch entrance pyrometer and constitute；（2）The cooling system of this part belongs to back segment cooling in tradition cooling, this invention is designed to it " leading portion cooling " the pattern in region, " finishing temperature " that air cooling target temperature is cooled down as second segment, independent closed-loop control system in compositing area together with coiling temperature target, the control of whole sub-sectional cooling can be both participated in, independent presetting and feedback control can have been carried out again in the region；
11）（1）Required according to step 6 cooldown rate and the successional requirement of second segment cooling curve, cooling manifold to two kinds of component system is redesigned, cold sperm collector is using few boiling water, slightly cold using many boiling water strategy, i.e. from the beginning of step 9 starting valve, cooling capacity integral forward lead, as much as possible for the water yield of cold sperm be assigned to slightly cold；（2）Si-Mn-Cr-Mo system cooling rate 20-30 DEG C/s, in 2 groups of cold sperm collectors, Bank15 1-4 row is pre- to open, and 5-8 row is used as feedback regulation, and remaining cold sperm collector all sets fault not boiling water, from the beginning of initial valve, 5 groups slightly cold collector using the sparse type of cooling（Row's mode is arranged every one）, this type of cooling Code Design is M；Si-Mn-Nb-Ti system cooling rate 50-60 DEG C/s, in 2 groups of cold sperm collectors, Bank14 1-4 row is pre- to open, and 5-8 row is used as feedback regulation, and remaining cold sperm collector all sets fault not boiling water, from the beginning of initial valve, 5 groups slightly cold collector adopt the continuously intensive type of cooling（That is opening ways successively）, this type of cooling Code Design is N.The method takes full advantage of the feature of field apparatus flexible configuration and the effective combination with model cootrol；
12）Model carries out feedforward control, and the closed-loop control system of step 10 starts, in a step 11, type of cooling code M, from the beginning of the initial valve of step 9, " leading portion cooling " pattern starts, 5 groups slightly the cold tube valve that integrate every arranging 4 row's cold sperms unlatching number for opening quantity for the precomputation total row-Bank15 of unlatching；Type of cooling code N, from the beginning of initial valve, " leading portion cooling " pattern also begins to start, 5 groups slightly cold integrate tube valve continuously open quantity as the precomputation total row of unlatching-
4 row's cold sperms of Bank14 open number；
13）Batch entrance pyrometer and belt steel temperature actual temperature signal is detected, the closed loop feedback control of coiling temperature starts in step 10, Si-Mn-Cr-Mo system cools down control mode code M, Bank15 1-8 row all participates in feedback regulation in step 11；Si-Mn-Nb-Ti system type of cooling code N, in step 11, Bank14 1-8 row all participates in feedback regulations, and respectively reach in step 7 that two kinds of compositions set batches target temperature；
14）In the feedback control of step 13 coiling temperature, ponding or fog etc. be there may be for belt steel surface affects the problem of temperature detection authenticity, such as batch pyrometer the temperature value of certain point is detected less than -30 DEG C of front 5 points of averages, the point is judged as the false point of detection, being not transferred to coiling temperature model carries out feedback control（False point design is gone）；
15）Replace table sample plate to carry out performance, tissue detection rolling latter two composition dual phase steel, such as performance is qualified and ferrite+martensitic structure is obtained, and this second segment cooling technique is fixed, otherwise, CCT curve is compareed, second segment cooling parameter is modified.
Embodiment
1
As a example by producing the Si-Mn-Cr-Mo system dual phase steel DP600 of trimmed size 3.6*1150mm, laminar flow second segment cooling step is as follows：
1. chemical composition is as shown in table 1, austenite Continuous Cooling Transformation Curve（CCT curve）As shown in 1 a of accompanying drawing；
1 Si-Mn-Cr-Mo system dual phase steel DP600 chemical composition of table（Mass fraction, %）
Balance of Fe.
2., from accompanying drawing 1a it can be seen that perlitic transformation area moves to right strongly, bainite transformation area right-hand member is sealed, between ferrite and bainite transformation area, have vertical temperature difference larger austenite meta-stable area；
3., in ferrite, austenitic area, its cooling transformation curve is determined as shown in fig. la；
4. after strip goes out " finish to gauge ", through first paragraph water-cooled（Enter ferrite area）The air cooling of+one long period（Generation ferritic transformation）+ second segment water-cooled, near martensitic regions, subsequent Slow cooling forms martensite to cooling finishing temperature；
5. by ferritic transformation C curve, " " nearby temperature is set to air cooling target temperature to nose, is 710 DEG C；Air cooling window is wider, and the air cooling object time is set to 6s；
6. second segment water-cooled window is wider, and cooldown rate is set to 20-30 DEG C/s；
7. after cooling ends, Slow cooling can form martensitic structure, and coiling temperature desired value can be more than martensite transfor mation curve, it is determined as 550 DEG C；
8. 880 DEG C of finishing temperature, during thickness 3.0mm, are 8.4m/s by the benchmark threading speed of 880+30 DEG C of calculating, then 3.6mm threading speed is：VThreading=V3.0 Threading-0.3n=8.4-0.3*2=7.8m/s；
9th, air cooling length L=VThreading* s=7.8*7=46.8m, cools down slightly cold starting valve location by model calculating second segment and arranges the beginning for the 9th of Bank11；
10th, 710 DEG C of finishing temperature of second segment cooling（That is air cooling target temperature）, 550 DEG C of coiling temperature, cooling manifold be made up of the intensive slightly cold collector+Bank14 of Bank9 ~ Bank13,15 cold sperm collector, instrumentation by the cold middle pyrometer of layer, batch entrance pyrometer and constitute, it is designed to independent model-controlled system, sees accompanying drawing 2；
11st, second segment cooling needs continuous coo1ing, is to ensure water yield reach, and Bank15 1-4 row is pre- to open, and 5-8 row is used as feedback regulation, and remaining cold sperm collector all sets fault not boiling water.Cooldown rate 20-30 DEG C/s, arranges the beginning from the 9th of initial valve Bank11 the, and slightly cold collector arranges row's mode toward the unlatching of coiling machine direction using every one, and this type of cooling Code Design is used for model cootrol for M.Thus, determine that the control parameter of second segment cooling sets such as table 2 below：
2 second segment of table cools down control parameter
12nd, strip starts rolling, enters second segment cooling control system, and model is carried out feedovering by cooling control parameter and mode, feedback control, as a result as table 3 below：
3 second segment cooling jig control result of table
13rd, come into operation in second segment cooling control false point function；
14th, after rolling rolling, take head, in, tail represent model and survey performance and the group following table 4 of organization data, meet the requirement of DP600 quality uniformity.
The performance of strip, tissue result after the cooling of 4 second segment of table
Embodiment
2
As a example by producing the Si-Mn-Nb-Ti system dual phase steel 580DP of trimmed size 4.2*1250mm, laminar flow second segment cooling step is as follows：
1st, chemical composition is as shown in table 5, austenite Continuous Cooling Transformation Curve（CCT curve）As shown in 1 b of accompanying drawing；
5 Si-Mn-Cr-Mo system dual phase steel DP600 chemical composition of table（Mass fraction, %）
| C | Si | Mn | P | S | Nb | Ti | Al |
| 0.085 | 0.20 | 1.25 | ≤0.020 | ≤0.0105 | 0.03 | 0.02 | 0.03 |
Balance of Fe.
2nd, from accompanying drawing 1a it can be seen that perlitic transformation area moves to right seldom, on the downside of perlitic transformation area, ferrite, austenite transition window are narrower in bainite transformation area；
3rd, in ferrite, austenitic area, determine its cooling transformation curve as shown in figure ib；
4th, after strip goes out " finish to gauge ", through first paragraph water-cooled（Enter ferrite area）The air cooling of+one short period（Generation ferritic transformation）The quick water-cooled of+second segment can just avoid pearlite, Bainite Region, and quickly enter martensitic regions, can just obtain ferrite+martensitic structure；
5th, by ferritic transformation C curve, " " nearby temperature is set to air cooling target temperature to nose, is 690 DEG C；Air cooling window is narrower, and the air cooling object time is set to 4.5s；
6th, second segment water-cooled window is narrower, need to increase cooldown rate, and cooldown rate is set to 50-60 DEG C/s；
7th, second segment cooling need to be cooled fast to below martensite transfor mation curve, and coiling temperature desired value is set to 180 DEG C；
8th, 830 DEG C of finishing temperature, during thickness 3.0mm, are 8.0m/s by the benchmark threading speed of 830+30 DEG C of calculating, then 4.2mm threading speed is：VThreading=V3.0 Threading-0.3n=8.0-0.3*4=6.8m/s；
9th, air cooling length L=VThreading* s=6.8*4.5=30.6m, cools down slightly cold starting valve location by model calculating second segment and arranges the beginning for the 8th of Bank9；
10th, 690 DEG C of finishing temperature of second segment cooling（That is air cooling target temperature）, 180 DEG C of coiling temperature, cooling manifold be made up of the intensive slightly cold collector+Bank14 of Bank9 ~ Bank13,15 cold sperm collector, instrumentation by the cold middle pyrometer of layer, batch entrance pyrometer and constitute, it is designed to independent model-controlled system, sees accompanying drawing 2；
11st, second segment cooling needs continuous coo1ing, is to ensure water yield reach, and Bank14 1-4 row is pre- to open, and 5-8 row is used as feedback regulation, and remaining cold sperm collector all sets fault not boiling water.Cooldown rate 50-60 DEG C/s, arranges the beginning from the 8th of initial valve Bank9 the, and slightly cold collector is opened toward coiling machine direction using the mode that continuously opens, and this type of cooling Code Design is used for model cootrol for N.Thus, determine that the control parameter of second segment cooling sets such as table 6 below：
6 second segment of table cools down control parameter
12nd, strip starts rolling, enters second segment cooling control system, and model is carried out feedovering by cooling control parameter and mode, feedback control, as a result as table 7 below：
7 second segment cooling jig control result of table
13rd, come into operation in second segment cooling control false point function；
14th, after rolling rolling, take head, in, tail represent model and survey performance and the group following table 8 of organization data, meet the requirement of 580DP quality uniformity.
The performance of strip, tissue result after the cooling of 8 second segment of table
Claims (5)
1. in a kind of laminar flow sub-sectional cooling technique, second segment cools down the control method of precision, it is characterized in that：The method comprises the steps：
（1）Draw two kinds of component system：Si-Mn-Cr-Mo system, the continuous cooling transformation (CCT) curve of Si-Mn-Nb-Ti system hot-rolled dual-phase steel；
（2）Determine the austenite of two kinds of compositions, ferrite, pearlite, bainite, Martensite temperature transformation range；
（3）Determine sub-sectional cooling " coiling technique window " scope of two kinds of compositions；
（4）The sub-sectional cooling processing route of two kinds of compositions is determined in " coiling technique window "；
（5）Determine air cooling target temperature and the air cooling object time of two kinds of compositions；
（6）Determine the second segment cooldown rate scope of two kinds of compositions；
（7）Determine that target temperature is batched in two kinds of composition second segment coolings；
（8）The method for control speed that two kinds of compositions closely at the uniform velocity roll soon；
（9）Two kinds of fixing initial valve locations of composition second segment cooling are calculated according to step 5 air cooling object time, step 8 mill speed；
（10）Two kinds of composition second segments are designed according to step 5-9 and cools down closed-loop control system；
（11）Target temperature, step 10 closed-loop control system composition, two kinds of composition cooling control modes of design and the corresponding cooling control routine of formulation are batched according to step 7；
（12）Second segment cools down feedforward control；
（13）Second segment cools down feedback control；
（14）Feedback control goes temperature vacation point to process；
（15）Detect to rolling the performance of latter two composition, tissue, cooling control parameter is solidified or is revised.
2. in laminar flow sub-sectional cooling technique according to claim 1, second segment cools down the control method of precision, it is characterized in that：Step（1）Described in two kinds of component system of drafting：Si-Mn-Cr-Mo system, the method for operating of the continuous cooling transformation (CCT) curve of Si-Mn-Nb-Ti system hot-rolled dual-phase steel are：Using Gleeble3500 hot modeling test machine, carry out two kinds of component system：Si-Mn-Cr-Mo system, Si-Mn-Nb-Ti system hot-rolled dual-phase steel thermal modeling test, determine its austenite Continuous Cooling Transformation Curve.
3. in laminar flow sub-sectional cooling technique according to claim 1, second segment cools down the control method of precision, it is characterized in that：Step（6）Described in two kinds of compositions second segment cooldown rate scope：Si-Mn-Cr-Mo system cooling rate 20-30 DEG C/s, Si-Mn-Nb-Ti system cooling rate 50-60 DEG C/s.
4. in laminar flow sub-sectional cooling technique according to claim 1, second segment cools down the control method of precision, it is characterized in that：Step（7）Described in second segment cooling batch target temperature：Si-Mn-Cr-Mo system coiling temperature scope 500-600 DEG C, takes 550 DEG C of desired value, Si-Mn-Nb-Ti system coiling temperature scope 100-250 DEG C.
5. in laminar flow sub-sectional cooling technique according to claim 1, second segment cools down the control method of precision, it is characterized in that：Step（8）Described in the method for control speed that closely at the uniform velocity rolls soon of two kinds of compositions：Hot-rolled dual-phase steel thickness range is 3.0-4.8mm, 880 DEG C of Si-Mn-Cr-Mo system finish to gauge target temperature, 830 DEG C of Si-Mn-Nb-Ti system target temperature, when finishing speeds model is calculated, on the basis of respective 3.0mm thickness, maximum threading speed is calculated using the method for thinning workpiece thickness speed governing, interstand cooling water control temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107262533A (en) * | 2017-06-26 | 2017-10-20 | 北京首钢股份有限公司 | A kind of control method for laminar cooling and device |
| CN108754104A (en) * | 2018-06-20 | 2018-11-06 | 北京首钢股份有限公司 | A method of eliminating the flat volume defect of 590Mpa rank dual phase steel hot rollings |
| CN109158431A (en) * | 2018-08-03 | 2019-01-08 | 首钢集团有限公司 | The autocontrol method of double cooling hot reheat header tail techniques of sections after a kind of Rolling for Hot Rolled Strip |
| CN109598008A (en) * | 2017-09-30 | 2019-04-09 | 上海梅山钢铁股份有限公司 | A kind of laminar flow U-shaped cooling procedure finite element stimulation method |
| CN112122361A (en) * | 2019-06-25 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for preventing medium-high carbon steel from cracking |
| CN112872059A (en) * | 2019-11-30 | 2021-06-01 | 上海梅山钢铁股份有限公司 | Control method for laminar flow two-stage cooling of thick hot-rolled strip steel |
| CN113441556A (en) * | 2020-03-25 | 2021-09-28 | 上海梅山钢铁股份有限公司 | Laminar cooling process control method of low-temperature coiled hot-rolled dual-phase steel |
| CN113680833A (en) * | 2021-08-06 | 2021-11-23 | 唐山钢铁集团有限责任公司 | Layer cooling control method for realizing two-stage cooling by utilizing conventional cooling |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107262533A (en) * | 2017-06-26 | 2017-10-20 | 北京首钢股份有限公司 | A kind of control method for laminar cooling and device |
| CN107262533B (en) * | 2017-06-26 | 2019-05-10 | 北京首钢股份有限公司 | A kind of control method for laminar cooling and device |
| CN109598008A (en) * | 2017-09-30 | 2019-04-09 | 上海梅山钢铁股份有限公司 | A kind of laminar flow U-shaped cooling procedure finite element stimulation method |
| CN109598008B (en) * | 2017-09-30 | 2023-11-10 | 上海梅山钢铁股份有限公司 | Finite element simulation calculation method for laminar flow U-shaped cooling process |
| CN108754104A (en) * | 2018-06-20 | 2018-11-06 | 北京首钢股份有限公司 | A method of eliminating the flat volume defect of 590Mpa rank dual phase steel hot rollings |
| CN109158431A (en) * | 2018-08-03 | 2019-01-08 | 首钢集团有限公司 | The autocontrol method of double cooling hot reheat header tail techniques of sections after a kind of Rolling for Hot Rolled Strip |
| CN112122361A (en) * | 2019-06-25 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for preventing medium-high carbon steel from cracking |
| CN112872059A (en) * | 2019-11-30 | 2021-06-01 | 上海梅山钢铁股份有限公司 | Control method for laminar flow two-stage cooling of thick hot-rolled strip steel |
| CN112872059B (en) * | 2019-11-30 | 2022-08-12 | 上海梅山钢铁股份有限公司 | Control method for laminar flow two-stage cooling of thick hot-rolled strip steel |
| CN113441556A (en) * | 2020-03-25 | 2021-09-28 | 上海梅山钢铁股份有限公司 | Laminar cooling process control method of low-temperature coiled hot-rolled dual-phase steel |
| CN113441556B (en) * | 2020-03-25 | 2022-09-09 | 上海梅山钢铁股份有限公司 | Laminar cooling process control method of low-temperature coiled hot-rolled dual-phase steel |
| CN113680833A (en) * | 2021-08-06 | 2021-11-23 | 唐山钢铁集团有限责任公司 | Layer cooling control method for realizing two-stage cooling by utilizing conventional cooling |
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