CN101745549B - Method for controlling steel feeding temperature of band steel of hot strip mill - Google Patents
Method for controlling steel feeding temperature of band steel of hot strip mill Download PDFInfo
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- CN101745549B CN101745549B CN 200810044095 CN200810044095A CN101745549B CN 101745549 B CN101745549 B CN 101745549B CN 200810044095 CN200810044095 CN 200810044095 CN 200810044095 A CN200810044095 A CN 200810044095A CN 101745549 B CN101745549 B CN 101745549B
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Abstract
A method for controlling steel feeding temperature of band steel of a hot strip mill comprises the working procedures of confirming the speed switching point of the middle roller way; measuring the actual temperature of the intermediate billet of the band steel; and measuring the actual feeding steel temperature of the band steel through the rough rolling mill outlet. The method in the invention is characterized by confirming the speed switching point of the roller way according to the length from the rough rolling outlet to the finish rolling inlet; selecting different running speeds of the middle roller way according to different device commissioning solutions; confirming the steel feeding target temperature (experience data) required by different steel types; calculating and comparing the actual steel feeding temperature; obtaining the operation time of the band steel in normal condition by pre-calculating the temperature in the operation process of the band steel; confirming the operation speed of the band steel in the middle roller way, and switching the speed; controlling the finish rolling inlet temperature of the band steel by controlling and regulating the operation time so that the actual steel feeding temperature meets the steel feeding target temperature requirement, so as to control the steel feeding temperature of the hot strip mill.
Description
Technical field
The present invention relates to metallurgical hot rolling field, specifically, the present invention relates to a kind of band steel of hot strip mill temperature-controlled process, more specifically, the present invention relates to the control method with the steel steel feeding temperature that a kind of continuous hot-rolling mill is positioned at the last frame of roughing.
Background technology
In metallurgical industry, the production of CSP coiled sheet comprises following process steps:
Continuous-cast blank---strand heating---blank de-scaling---roughing technique---finish-rolling process---band steel laminar flow cooling technology-batch.
The band steel that finishing mill shuts out adopts corresponding cooling system by band steel laminar cooling system on runout table, the coiling temperature that hot-strip is cooled to stipulate by finishing temperature.With the type of cooling of steel, cooling water inflow is all calculated according to different steel grades, specification, finishing temperature, coiling temperature by computer and sets and control.
As the tandem hot strip mill unit, the characteristics of hot strip rolling production are that continuity, rapidity, real-time, control accuracy are high.And be the important guarantee of strip quality with the temperature controlled accuracy of steel.Steel feeding temperature with steel is directly connected to the quality of production of product and rolling stability, iron scale defective for example, and there is obvious corresponding relation in it with steel feeding temperature with steel, and Fig. 7 is the corresponding relation figure of iron scale and temperature.
In Fig. 6, significantly can see, along with the rising of temperature, its thickness that produces iron scale will increase greatly, thereby have influence on the quality of production of final products.For this reason, if effectively control with the steel feeding temperature of steel, can effectively improve the deformed area temperature in the operation of rolling with steel, reduce the thickness of iron scale.
In addition, because there is different rolling characteristics in different with steel, for example in the production process of ultra-low-carbon steel, because its phosphorus content is lower, the temperature of its two-phase region is 890 ℃ of left and right, in case steel feeding temperature is too low, to cause the decline of rolling stability, thus accidents caused generation.
For this reason, existing people is studied the control of band steel of hot strip mill temperature.
For example, be that " 95108943.9 ", denomination of invention are that in the patent application technology of " temperature-controlled process during hot-rolled band is rolling ", its disclosed principal character is 1, is to list rolling tropocal wood at multimachine seat hot-rolled band machine at number of patent application; 2, when threading by the method with cooling control temperature, its temperature is controlled.Its key technology is, the band steel enter the band steel is carried out before single milling train or mill train cooling, and when passing through the support of hot-rolled band machine row/single milling train with steel, according to the thermal constant of inlet temperature to band the intensity of cooling between end to end control.
And for example, the patent No. is that " CN02132974.5 ", denomination of invention disclose a kind of control method with steel finishing mill roll gap for the granted patent of " with the control method of steel finishing mill roll gap ", its key technology is by process computer, finish rolling inlet temperature value, the temperature value of each frame of finish rolling, each frame roll-force value of finish rolling, each frame gap values between rollers of finish rolling that relates to be calculated, and adjusts by PLC and depress motor and hydraulic means adjustment roll gap.
Above-mentioned first patent is to force coolingly by cooling water, and above-mentioned second patent is by each frame gap values between rollers is calculated, and adjusts by PLC and depress motor and hydraulic means is adjusted roll gap, carries out temperature and controls.
As mentioned above, to controlling with the temperature of steel be or by the control method with steel finishing mill roll gap in the past, temperature value, each frame roll-force value of finish rolling, each frame gap values between rollers of finish rolling to finish rolling inlet temperature value, each frame of finish rolling calculate, and adjust by PLC and depress motor and hydraulic means adjustment roll gap; Or enter by the band steel and the band steel is carried out before single milling train or mill train coolingly, and according to the thermal constant of inlet temperature, the intensity of cooling between the band head and tail is being controlled during the support by hot-rolled band machine row/single milling train with steel.All do not relate to control how to pass through the continuous hot-rolling mill steel feeding temperature, to controlling in the adjusting of the running time of delay table with steel.
The inventor recognizes: by to the improvement of steel in the running time of delay table, can play the control to steel feeding temperature.
The inventor recognizes: take full advantage of the temperature loss in running with steel, the inlet temperature that relates to is controlled, its Main Basis is the temperature of interior intermediate blank control during this period of time from roughing to finish rolling F1 frame, will directly have influence on band steel steel feeding temperature.And will directly have influence on control with the steel feeding temperature of steel with steel in the temperature in this section zone.Because there is different rolling characteristics in different with steel, therefore how utilizing the online temperature instrumentation of present hot rolling controls the steel feeding temperature with steel, to being controlled in the operation of hot rolling delay table with steel, thereby can improve the quality of product and rolling stability, satisfy the requirement that different product is produced.
Summary of the invention
Problem for conventional art exists the object of the invention is to: a kind of control method of band steel of hot strip mill temperature is provided, more particularly, the object of the present invention is to provide a kind of control method of continuous hot-rolling mill steel feeding temperature.
the present invention is by the temperature detection to each procedure, thereby obtain one with the actual temperature of steel, the empirical parameter that advances steel with finish rolling compares, simultaneously by to the temperature precomputation in running with steel, obtain band steel running time under normal circumstances, last according to different running times, confirm with the speed of service system of steel at delay table, control by running time, adjust, the temperature (finish rolling inlet temperature) that enters finish rolling with steel is controlled, thereby solve the abnormal problem of finish rolling inlet temperature in course of hot rolling, control thus the continuous hot-rolling mill steel feeding temperature.
For achieving the above object, the technical scheme of the control method of a kind of continuous hot-rolling mill steel feeding temperature of the present invention is as follows.
A kind of control method of continuous hot-rolling mill steel feeding temperature comprises:
Determine the delay table speed switching point between the last frame of roughing and finish rolling the first frame, to the operation of measuring with steel intermediate blank actual temperature between the last frame of roughing and finish rolling the first frame, and the operation of measuring with the actual steel feeding temperature of steel to exporting by roughing mill, it is characterized in that
(1) export to this segment length of finish rolling entrance according to roughing, determine the roller table speed switching point,
(2) pre-select a roller table speed operation system;
(3) then export to this segment length of finish rolling entrance according to roughing, calculate with the temperature drop of steel in this section process;
(4) record the actual steel feeding temperature of band steel that exports by roughing mill, according to above-mentioned temperature drop, the calculating steel feeding temperature of precomputation band steel;
That (5) determines different steel grade requirements advances the steel target temperature, with comparing from the steel target temperature that advances that described different steel grades require with steel calculating steel feeding temperature that above-mentioned precomputation obtains, satisfy into steel bar spare and select into steel, namely carry out the switching of the delay table speed of service, do not satisfy condition, enter next flow process (6);
(6) as undesirable, reselect delay table speed, and precomputation band steel calculates steel feeding temperature again;
(7) repeat above-mentioned steps 5-6, meet the requirements until the band steel that precomputation obtains calculates steel feeding temperature.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Described speed operation system is as follows:
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 2-8 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine 8-12 second by current band steel finish rolling the first gantry speed.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Described switching point is chosen in the 50-75m that goes out the roughing maximum length with steel and adds the 5-10m place.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The calculating steel feeding temperature with steel that described precomputation obtains=actual measurement band steel steel feeding temperature-arrive with steel temperature drop of finish rolling.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
, when adopting the aligning operation, employing speed operation system 1;
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-6 meter per second 2-4 second,
D: pre-straightening speed: 1.2-1 meter per second 5-10 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine 8-12 second by current band steel finish rolling the first gantry speed,
Above-mentioned total haulage time is controlled at 50-55 second; Wherein the time before shearing is controlled at 30-35 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 3-5 second,
E: firing rate: 0.8-1 meter per second
F: deceleration: 1-1.2 meter per second
25-10 second,
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine by current band steel finish rolling the first gantry speed, 8-12 second,
Above-mentioned total haulage time is controlled at 45-48 second; Wherein the time before shearing is controlled at 22-28 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Speed operating scheme 3 is selected in the preliminary election of the delay table speed of service and the different delay table speeds of service, the selection of time, and the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 6-8 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second 8-12 second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine by current band steel finish rolling the first gantry speed, 8-12 second,
Above-mentioned total haulage time is controlled at 40-44 second, and wherein the time before shearing is controlled at 16-21 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Advance steel target temperature setting grade as follows:
| Steel feeding temperature | ＜＝890 | ＜＝900 | ＜＝910 | ＜＝920 | ＜＝930 | ＜＝940 |
| |
1 | 2 | 3 | 4 | 5 | 6 |
| Steel feeding temperature | ＜＝950 | ＜＝960 | ＜＝970 | ＜＝980 | ＜＝990 | ＜＝1000 |
| Grade | 7 | 8 | 9 | 10 | 11 | 12 |
| Steel feeding temperature | ＜＝1010 | ＜＝1020 | ＜＝1030 | ＜＝1040 | ＜＝1050 | ＞1060 |
| Grade | 13 | 14 | 15 | 16 | 17 | 18 |
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The band steel moves at delay table, and namely the temperature drop of intermediate blank is calculated as follows:
As the input parameter that calculates, be used as the initial temperature of intermediate blank with the roughing outlet temperature;
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop+heat conduction and convection current temperature drop,
Usually, consider that band steel temperature drop=water-cooled temperature drop+radiation temperature drop gets final product.
The impact of radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel thickness temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient on temperature,
Water-cooled temperature drop=De-scaling box inlet temperature-De-scaling box outlet temperature.
According to the control method of continuous hot-rolling mill steel feeding temperature of the present invention, the input of intermediate blank temperature computation model comprises workpiece thickness, material coefficient, the speed of roller-way, insulation cover coefficient, the parameters such as high-pressure water descaling coefficient of utilization.
Described roller table speed coefficient: 0.8-1.1.
Described belt steel thickness temperature coefficient: 0.9-1.2.
Described workpiece thickness: 30-70mm, it is to temperature drop influence coefficient: 0.8-1.1.
Material coefficient: to the influence coefficient 1-1.3 of temperature.
The insulation cover coefficient: on affect 8 ℃-15 ℃ of temperature,
The high-pressure water descaling coefficient of utilization: when not dropping into, temperature drop is at 0 ℃,
When dropping into 1 group, temperature drop is at 18 ℃-25 ℃,
When dropping into 2 groups, temperature drop is at 28 ℃-40 ℃.
For heat conducting calculating, in this numerical procedure, adopted the following vertical leaf simplification heat conduction law formula of paying, specific as follows:
In formula: Q
tThe heat (J) that transmits
λ
tThe thermal conductivity factor of material, the J/ of unit (mm s ℃)
A is perpendicular to the cross-sectional area (mm2) of hot-fluid
Distance on the L direction of heat flow (mm)
The temperature at T ω 1-T ω 2 two ends poor (℃)
Δ t conducts heat the time (s)
The calculating of convection heat transfer' heat-transfer by convection:
In the technical program, to the calculating of convection heat transfer' heat-transfer by convection, adopt following computing formula:
Q
t＝a
tAΔtΔT
In formula: the heat (J) of Qt exchange
The at surface film thermal conductance, J/ (mm
2.s. ℃).
Interfacial area (mm between A fluid and solid
2)
The temperature difference of Δ T fluid and solid (℃)
The Δ exchange heat time (s).
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The temperature computation of described intermediate blank is the section of dividing along its length, and section length is divided according to the different thickness that goes out with steel after finish rolling.
| Thickness | The segment length |
| ＜4mm | 0.8-1.2m |
| ＞＝4mm＜7 | 0.6-0.8m |
| ＞7mm | 0.5-0.6m |
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The temperature drop of described radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient impact.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
For relatively stable, accurately calculate belt steel temperature, when the temperature when being used for the delay table speed of service and switching is controlled, averaging method is adopted in calculating and control to each section temperature, namely, segment length's temperature data of the 15%-20% that employing monoblock band steel begins averages, with this control principle as temperature.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The speed of the delay table after switching: 0＜speed＜7 meter.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The following scope of the speed of the delay table after switching:
The speed of scheme 1: 3.2-4.3m/s,
The speed of scheme 2: 4.3-5.6m/s,
The speed of scheme 3: 5.6-7m/s.
Obtain the hop count of this piece band steel in conjunction with the length with steel; Belt steel thickness 3mm for example, length 900.15m, this band steel is 900 sections; Then according to the length of steel in roughing outlet, the division that averages, for example this is 60m with steel in the length of roughing outlet,, this segment length with steel is the 0.067m/ section.
Calculate the temperature of each section, intermediate blank is calculated the temperature of each layer at the thickness direction higher slice.
The speed of roller-way: 0＜speed＜7 meter, its impact is main, and in the technical program, its time influence coefficient is 2.6 ℃/S by embodying in the running time of delay table with steel, in this programme, for the friction speed scheme require as follows:
The speed of scheme 1: 3.2-4.3m/s
The speed of scheme 2: 4.3-5.6m/s
The speed of scheme 3: 5.6-7m/s
When relating to the temperature drop of above-mentioned parameter, mainly consider from radiation temperature drop and water-cooled temperature drop:
The temperature drop of radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient impact
Water-cooled temperature drop=De-scaling box inlet temperature-De-scaling box outlet temperature,
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop.
For example, when rolling SPHC (steel grade) band steel (the material coefficient gets 1), the roughing outlet temperature is 1100 ℃ (the belt steel temperature coefficient gets 1), and thickness is 42mm (the thick coefficient of intermediate blank gets 1), and the temperature drop when delay table speed is scheme 2 is calculated as follows:
(2.6 ℃/s*1*1*1*1)-10 ℃=52.4 ℃ of the * of radiation temperature drop=(120m/5m/s)
When adopting 1 group of de-scaling: (the water-cooled temperature drop is roughly 22 ℃ of time-measured values),
Temperature drop=52.4+22 ℃=74.4 ℃ of band steel,
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1025.6 ℃.
Be 13 (requiring＜=1010 ℃) with reference to this with steel feeding temperature grade corresponding to steel, can not satisfy steel feeding temperature, (Fig. 1 7) delay table speed switches to scheme 1 when the band steel arrives switching point, specifically is calculated as follows:
(2.6 ℃/s*1*1*1*1)-10 ℃=78 ℃ of the * of radiation temperature drop=(120m/4m/s)
When adopting 1 group of de-scaling: (the water-cooled temperature drop is roughly 22 ℃ of time-measured values)
Temperature drop=78+22 ℃=100 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1000 ℃
Satisfy into the steel requirement＜=1010 ℃, advance steel.
In addition, in the concrete control to temperature, in the control of routine, related to the controls such as stay-warm case, de-scaling water, tapping temperature, ignored at this.
the present invention is by the temperature detection to each procedure, thereby obtain one with the actual temperature of steel, the empirical parameter that advances steel with finish rolling compares, simultaneously by to the temperature precomputation in running with steel, obtain band steel running time under normal circumstances, last according to different running times, confirm with the speed of service system of steel at delay table, control by running time, adjust, the temperature (finish rolling inlet temperature) that enters finish rolling with steel is controlled, thereby solve the abnormal problem of finish rolling inlet temperature in course of hot rolling, control thus the continuous hot-rolling mill steel feeding temperature.
The simple declaration of accompanying drawing
The roughing that Figure 1 shows that the inventive method exports to finish rolling entrance hot rolling delay table sketch.
Figure 2 shows that the speed operating scheme 1 of the inventive method.
Figure 3 shows that the speed operating scheme 2 of the inventive method.
Figure 4 shows that the speed operating scheme 3 of the inventive method.
Figure 5 shows that the schematic flow sheet of the inventive method.
Fig. 6 is the corresponding relation figure of iron scale and temperature in the hot strip rolling process.
In figure, 1 is the last frame of roughing, and 2 are finish rolling the first frame, and 3 are the finish rolling de-scaling, and 4 are the finish rolling crop shears, and 5 is intermediate heating device, and 6 is middle straightener, and 7 is switching point, and 8 is temperature measurer.
The specific embodiment
Below, with reference to accompanying drawing, be described more specifically the present invention.
Embodiment:
Take the rolling SPHC band of Baogang Stocks Trading Co.'s 1880mm hot rolling mill steel as example:
1. concrete band steel kind and the specification thereof used of embodiment
| Band steel kind | Specification |
| SPHC | 30-70mm |
| SS330 | 30-70mm |
| SS400 | 30-70mm |
| ST37-2 | 30-70mm |
| ST44-2 | 30-70mm |
| B380CL | 30-70mm |
| SS490 | 30-70mm |
| SAPH440 | 30-70mm |
| QSTE340TM | 30-70mm |
| QSTE380TM | 30-70mm |
| QSTE420TM | 30-70mm |
| WELTEN590RE | 30-70mm |
| B20H | 30-70mm |
| 30CrMo | 30-70mm |
| 30CRMO | 30-70mm |
| B40 | 30-70mm |
| 65MN | 30-70mm |
| 50MN2V | 30-70mm |
2. determine that it is 120-140m that roughing exports to this segment length of finish rolling entrance.
3. determine switching point.Switching point is chosen in the 50m that goes out the roughing maximum length with steel and adds the 10m place.
Referring to 7 in Fig. 1, carry out the switching of speed at this switching point; This segment length generally adds that according to producing line long, the thinnest rolling intermediate slab the surplus of 50-60 rice is definite, and general length is in 120-140 rice left and right; Because the position of switching point must be after being with steel to run to maximum speed, therefore must determine according to the length of producing line long, the thinnest rolling intermediate slab and the length of delay table.
Switching point is generally determined according to producing line long, the thinnest rolling intermediate slab.Now produce line slab maximum ga(u)ge 250mm, the band steel goes out roughing thickness 50mm, the maximum 10m of slab, and the select tape steel goes out roughing maximum length 50m, the 10m place of the position of this switching point after 50m.
4. pre-select a roller table speed operation system.
when the band steel does not arrive point for measuring temperature, owing to there is no actual temperature, simultaneously different speed, produce different temperature drops with making with steel at delay table, therefore the necessary preliminary election delay table speed of service, in the technical program, adopted according to different putting equipment in service schemes, select the different delay table speeds of service, concrete grammar makes: when the equipment for straightening 6 that adopts Fig. 1 is aligned, employing speed operation system 1, when the middle firing equipment 5 that adopts Fig. 1 carries out the centre heating, employing speed operation system 2, when aligning and middle the heating all the not used time, employing speed operation system 3.
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-6 meter per second 2-4 second,
D: pre-straightening speed: 1.2-1 meter per second 5-10 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine 8-12 second by current band steel finish rolling the first gantry speed,
Above-mentioned total haulage time is controlled at 50-55 second; Wherein the time before shearing is controlled at 30-35 second.
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 3-5 second,
E: firing rate: 0.8-1 meter per second
F: deceleration: 1-1.2 meter per second
25-10 second,
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine by current band steel finish rolling the first gantry speed, 8-12 second,
Above-mentioned total haulage time is controlled at 45-48 second; Wherein the time before shearing is controlled at 22-28 second.
Speed operating scheme 3, the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 6-8 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second 8-12 second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine by current band steel finish rolling the first gantry speed, 8-12 second,
Above-mentioned total haulage time is controlled at 40-44 second, and wherein the time before shearing is controlled at 16-21 second.
5. determine into steel target temperature grade,
| Steel feeding temperature | ＜＝890 | ＜＝900 | ＜＝910 | ＜＝920 | ＜＝930 | ＜＝940 |
| |
1 | 2 | 3 | 4 | 5 | 6 |
| Steel feeding temperature | ＜＝950 | ＜＝960 | ＜＝970 | ＜＝980 | ＜＝990 | ＜＝1000 |
| Grade | 7 | 8 | 9 | 10 | 11 | 12 |
| Steel feeding temperature | ＜＝1010 | ＜＝1020 | ＜＝1030 | ＜＝1040 | ＜＝1050 | ＞1060 |
| Grade | 13 | 14 | 15 | 16 | 17 | 18 |
6. the intermediate blank segment length divides
Segment length's division is specific as follows: according to the different thickness that goes out with steel after finish rolling, divide.(following data are the experience time, mainly according to determining with the speed of steel operation) specific as follows;
| Thickness | The segment length |
| ＜4mm | 0.8-1.2m |
| ＞＝4mm＜7 | 0.6-0.8m |
| ＞7mm | 0.5-0.6m |
According to above-mentioned method, obtain the hop count of this piece band steel in conjunction with the length with steel; Belt steel thickness 3mm for example, length 900.15m, this band steel is 900 sections; Then according to the length of steel in roughing outlet, the division that averages, for example this is 60m with steel in the length of roughing outlet,, this segment length with steel is the 0.067m/ section).Described segment length's division is used for the actual steel feeding temperature with steel is carried out more accurate measurements and calculations.
7. calculate actual steel feeding temperature.
By the temperature measurer (8 in Fig. 1) that roughing mill exports, the actual steel feeding temperature with steel is measured.
8. calculate the temperature drop with steel, thus the calculating steel feeding temperature of precomputation band steel.
In this programme, consider that material is not have under the condition of phase transformation or chemistry reflection when temperature descends:
When relating to the temperature drop of above-mentioned parameter, mainly consider from radiation temperature drop and water-cooled temperature drop:
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop
The temperature drop of radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient impact.
When rolling SPHC (steel grade) band steel (the material coefficient gets 1), the roughing outlet temperature is 1100 ℃ (the belt steel temperature coefficient gets 1), thickness is 42mm (the thick coefficient of intermediate blank gets 1), and described roller table speed coefficient gets 1, and the temperature drop when delay table speed is scheme 2 is calculated as follows:
(2.6 ℃/s*1*1*1*1)-10 ℃=52.4 ℃ of the * of radiation temperature drop=(120m/5m/s).
When adopting 1 group of de-scaling:
Temperature drop=52.4+22 ℃=74.4 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1025.6 ℃.
Be 13 (requiring＜=1010 ℃) with reference to this with steel feeding temperature grade corresponding to steel, can not satisfy steel feeding temperature, delay table speed switches to scheme 1 when the band steel arrives switching point, specifically is calculated as follows:
(2.6 ℃/s*1*1*1*1)-10 ℃=78 ℃ of the * of radiation temperature drop=(120m/4m/s)
When adopting 1 group of de-scaling:
Temperature drop=78+22 ℃=100 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1000 ℃
Satisfy into the steel requirement＜=1010 ℃, advance steel.
In addition, in the concrete control to temperature, in the control of routine, related to the controls such as stay-warm case, de-scaling water, tapping temperature, ignored at this.
9. will calculate steel feeding temperature and advance the steel target temperature relatively, and satisfying into steel bar spare and select into steel
When rolling SPHC (steel grade) band steel (the material coefficient gets 1), the roughing outlet temperature is 1100 ℃ (the belt steel temperature coefficient gets 1), thickness is 42mm (the thick coefficient of intermediate blank gets 1), and described roller table speed coefficient gets 1, and the temperature drop when delay table speed is scheme 2 is calculated as follows:
(2.6 ℃/s*1*1*1*1)-10 ℃=52.4 ℃ of the * of radiation temperature drop=(120m/5m/s)
When adopting 1 group of de-scaling:
Temperature drop=52.4+22 ℃=74.4 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1025.6 ℃
The steel feeding temperature grade not corresponding with reference to this one-tenth is 13 (requiring＜=1010 ℃), can not satisfy steel feeding temperature, and when the band steel arrived switching point, delay table speed switched to scheme 1, specifically is calculated as follows:
(2.6 ℃/s*1*1*1*1)-10 ℃=78 ℃ of the * of radiation temperature drop=(120m/4m/s)
When adopting 1 group of de-scaling:
Temperature drop=78+22 ℃=100 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1000 ℃
Satisfy into the steel requirement＜=1010 ℃, advance steel.
10. carry out the switching of the delay table speed of service at switching point.
The velocity interval of the delay table after switching: 0＜speed＜7 meter.
More specifically, the velocity interval of the delay table after switching:
The speed of scheme 1: 3.2-4.3m/s,
The speed of scheme 2: 4.3-5.6m/s,
The speed of scheme 3: 5.6-7m/s.
the present invention is by the temperature detection to each procedure, thereby obtain one with the actual temperature of steel, the empirical parameter that advances steel with finish rolling compares, simultaneously by to the temperature precomputation in running with steel, obtain band steel running time under normal circumstances, last according to different running times, confirm with the speed of service system of steel at delay table, control by running time, adjust, the temperature (finish rolling inlet temperature) that enters finish rolling with steel is controlled, thereby solve the abnormal problem of finish rolling inlet temperature in course of hot rolling, control thus the continuous hot-rolling mill steel feeding temperature.The present invention can effectively solve the quality of production of product and rolling stability, has prospect of the application widely.
Claims (13)
1. the control method of a steel feeding temperature of band steel of hot strip mill comprises:
Determine the delay table speed switching point between the last frame of roughing and finish rolling the first frame, to the operation of measuring with steel intermediate blank temperature between the last frame of roughing and finish rolling the first frame, and to the operation of measuring with the actual steel feeding temperature of steel by the roughing mill exit, it is characterized in that
(1) export to this segment length of finish rolling entrance according to roughing, determine the roller table speed switching point;
(2) pre-select a roller table speed operation system;
In described speed operation system, speed, the time control range of each section are as follows:
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2,
C, transfer rate: 5.5-7 meter per second 2-8 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2,
G: shear rate: the 0.8-1 meter per second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: by current band steel finish rolling the first gantry speed, move 8-12 second,
(3) then according to the roughing exit to this segment length of finish rolling entrance, calculate with the temperature drop of steel in this section process;
(4) record the actual steel feeding temperature of band steel by the roughing mill exit, according to the temperature drop on from the roughing exit to this segment length of finish rolling entrance with steel, the calculating steel feeding temperature of precomputation band steel:
Calculate steel feeding temperature=actual steel feeding temperature of roughing exit band steel-with steel from the roughing exit temperature drop to the delay table of finish rolling entrance;
That (5) determines different steel grade requirements advances the steel target temperature, with comparing from the steel target temperature that advances that described different steel grades require with steel calculating steel feeding temperature that above-mentioned precomputation obtains, satisfy into steel bar spare and select into steel, carry out the switching of the delay table speed of service, do not satisfy condition, enter next step (6);
(6) as undesirable, reselect delay table speed operation system, and the calculating steel feeding temperature of precomputation band steel again;
(7) repeat above-mentioned steps 5-6, until the calculating steel feeding temperature of precomputation band steel meets the requirements.
2. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 1, is characterized in that, described switching point is chosen in the band steel and goes out the roughing maximum length and add the 5-10m place, and wherein being with steel to go out the roughing maximum length is 50-75m.
3. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 1, is characterized in that, with the temperature drop meter of steel in the delay table operation
Following:
As the input parameter that calculates, be used as the initial temperature of intermediate blank with the roughing outlet temperature;
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop,
The temperature drop of radiation temperature drop=(speed of delay table length/delay table) * (the thick coefficient * of 2.6 ℃/s* delay table velocity coeffficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient impact,
Wherein, described delay table velocity coeffficient: 0.8-1.1, described belt steel temperature coefficient: 0.9-1.2, described workpiece thickness coefficient: 0.8-1.1, described material coefficient: 1-1.3,
Water-cooled temperature drop=De-scaling box inlet temperature-De-scaling box outlet temperature,
The temperature drop of described insulation cover coefficient impact is 8 ℃-15 ℃.
4. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 3, it is characterized in that, the calculating of the initial temperature of described intermediate blank is calculated by the section of dividing along its length, and the segment length carries out following division according to the different thickness that goes out with steel after finish rolling:
。
5. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 4, it is characterized in that, when the initial temperature that is used for intermediate blank is controlled, to the calculating of intermediate blank initial temperature and control and adopt averaging method, namely each section temperature data of the 15%-20% that begins of monoblock band steel averages.
6. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 5, is characterized in that, the selection of the preliminary election of the delay table speed of service and different delay table speed of service time, and when adopting the aligning operation, employing speed operation system 1;
Speed operation system 1, that is, the speed of this each section of system, time control range are as follows:
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-6 meter per second 2-4 second,
D: pre-straightening speed: 1.2-1 meter per second 5-10 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: by current band steel finish rolling the first gantry speed, move 8-12 second,
Above-mentioned total haulage time is controlled at 50-55 second; Wherein the time before shearing is controlled at 30-35 second.
7. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 5, it is characterized in that, the selection of the preliminary election of the delay table speed of service and different delay table speed of service time, select speed operation system 2 in the middle of adopting during heating, the speed of this each section of system, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 3-5 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: by current band steel finish rolling the first gantry speed, move 8-12 second,
Above-mentioned total haulage time is controlled at 45-48 second; Wherein the time before shearing is controlled at 22-28 second.
8. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 5, it is characterized in that, the preliminary election of the delay table speed of service and the different delay table speeds of service, the selection of time, when aligning and middle heating all not the used time select speed operation system 3, the speed of this each section of system, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 6-8 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second 8-12 second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: determine by current band steel finish rolling the first gantry speed, 8-12 second,
Above-mentioned total haulage time is controlled at 40-44 second, and wherein the time before shearing is controlled at 16-21 second.
9. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 1, is characterized in that, advances steel target temperature setting grade as follows:
。
10. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 1, is characterized in that, the speed of the delay table after switching: 0 ﹤ speed ﹤ 7m/s.
11. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 6 is characterized in that,
The speed of the delay table after switching: 3.2-4.3m/s.
12. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 7 is characterized in that,
The speed of the delay table after switching: 4.3-5.6m/s.
13. the control method of steel feeding temperature of band steel of hot strip mill as claimed in claim 8 is characterized in that,
The speed of the delay table after switching: 5.6-7m/s.
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| CN102688900B (en) * | 2011-03-23 | 2014-08-20 | 宝山钢铁股份有限公司 | Method for guaranteeing hot continuous rolling mill finish rolling outlet temperature |
| CN102343367B (en) * | 2011-10-14 | 2015-01-14 | 东北大学 | Control method for lowering head and tail undercooled sections of steel plate in pressure jet cooling process |
| CN103170506B (en) * | 2011-12-20 | 2015-04-22 | 上海梅山钢铁股份有限公司 | Hot rolling and finish rolling multi-level threading speed control method |
| CN102896149B (en) * | 2012-10-18 | 2014-08-20 | 唐山国丰钢铁有限公司 | Hot-rolled strip steel rolling technology for preventing high-speed breaking-away of roughing mill |
| CN103990653B (en) * | 2013-02-19 | 2016-03-30 | 宝山钢铁股份有限公司 | Entry temperature at finishing accuracy at target method of assuring |
| CN104001736B (en) * | 2013-02-22 | 2016-04-27 | 宝山钢铁股份有限公司 | Band steel of hot strip mill temperature-controlled process |
| CN104923575B (en) * | 2015-05-28 | 2017-12-12 | 柳州钢铁股份有限公司 | Steel rolling temprature control method |
| CN108421831B (en) * | 2018-02-27 | 2019-09-20 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling temperature drop in rough rolling process |
| CN108687140B (en) * | 2018-05-11 | 2019-06-28 | 鞍钢股份有限公司 | Self-learning control method for slab temperature of hot rolling heating furnace |
| DE102019203088A1 (en) * | 2019-03-06 | 2020-09-10 | Sms Group Gmbh | Process for the production of a metallic strip or sheet |
| CN110157892B (en) * | 2019-04-10 | 2020-10-02 | 唐山钢铁集团有限责任公司 | Temperature fluctuation control method for continuous annealing of different strip steels |
| CN114570776A (en) * | 2020-11-30 | 2022-06-03 | 宝山钢铁股份有限公司 | Control method for overall length temperature uniformity of discharged plate blank of vehicle bottom type heating furnace |
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