CN103433298A - Method for controlling tail portion of thin rolled container plate - Google Patents
Method for controlling tail portion of thin rolled container plate Download PDFInfo
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- CN103433298A CN103433298A CN2013103556838A CN201310355683A CN103433298A CN 103433298 A CN103433298 A CN 103433298A CN 2013103556838 A CN2013103556838 A CN 2013103556838A CN 201310355683 A CN201310355683 A CN 201310355683A CN 103433298 A CN103433298 A CN 103433298A
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Abstract
The invention relates to a method for controlling the tail portion of a thin rolled container plate. The method for controlling the tail portion of the thin rolled container plate is characterized in that in the heating process of a heating furnace, a heating temperature schedule is set according to the production mode and the temperature required by a plate blank when the plate blank is placed into the furnace, in the rough rolling process, rapid rolling is conducted and the temperature in the final stage of rough rolling is guaranteed to be controlled within the range of 1110+/-30 DEG C, in the finish rolling process, the temperature of a finish rolling outlet is controlled within the range of (880-900)+/-20 DEG C, in the finish rolling process, the laminar flow cooling method is adopted as a front section rapid cooling method, the temperature of a laminar flow outlet is controlled within the range of 630+/-20 DEG C, and the speed of a finish rolling unit is controlled through the method of controlling the speed of a penetrating belt and the speed of the tail portion. The method for controlling the tail portion of the thin rolled container plate has the advantages that the tail portion throwing rate is lowed from 40% to about 2%, the tail portion throwing is effectively reduced, smoothness of rolling is ensured, the product specification is expanded, the problem that the tail portion of the thin limit material is thrown due to the fact that the rolling speed is high and an operator can not timely adjust the rolling speed is solved, stable production of the thin container plate is achieved, and the market competitiveness of the thin container plate is improved.
Description
Technical field
The present invention relates to technical field of steel rolling, particularly a kind of ultra-thin gauge rolling container plate End-Management method of producing the thin set of specifications box loading plate that thickness is 1.2mm-2.0mm.
Background technology
Along with improving constantly that the container demand is increasing and the user requires product quality, output and the quality of container steel band are had higher requirement.The thickness range of needs of Nowadays, Container shipping steel band is mainly 1.6mm ~ 6.0mm, and the thin set of specifications box loading plate consumption of thickness≤2.0mm has accounted for 50% left and right of all container steel band consumptions, and therefore the development and production of thin specification is that container plate is produced key.
Along with updating of hot continuous rolling production line equipment, level of control and technology, its integral production ability is greatly improved, but still has more difficulty for the container plate of the thin specification of rolling.The production of≤2.0mm thickness has been the limit of traditional hot continuous rolling, very harsh to whole production requirement.
At the initial stage of rolling, because rolling thickness is thin, speed is fast, the operative employee can not be adjusted timely, situation is very serious to cause being with the steel afterbody to break, afterbody rolls brokenly etc., the whipping rate of thin specification has reached 40% according to statistics, serious impact the direct motion of product quality and production, be unfavorable for completing of contract, increased production cost.
Summary of the invention
Purpose of the present invention just is to provide a kind of by after the simple transformation to existing equipment and control, solves thin specification limit material because mill speed is fast, the operative employee has little time to adjust the problem that causes whipping.Descended more than 90% by transforming the thin specification whipping of the rear rolling ratio rolling initial stage, realized the steady production of thin set of specifications box loading plate, increased substantially the ultra-thin gauge rolling container plate End-Management method of the market competitiveness of container plate.
Solution of the present invention is such:
The thin set of specifications box loading plate that the present invention is 1.2mm-2.0mm for the production of thickness, the technological process of production comprises: slab → heating furnace heating → thick dephosphorization → roughing → Coil Box → flying shear → smart dephosphorization → finish rolling rolling → laminar flow is cooling → and batches, take following control strategy to be controlled:
(1), heating and temperature control strategy:
In described heating furnace heating process, according to production model, slab charging temperature, be set as follows temperature system:
| Slab thickness lower limit (mm) | The slab thickness upper limit (mm) | The charging temperature lower limit (℃) | The charging temperature upper limit (℃) | Coil of strip target width lower limit (mm) | The coil of strip target width upper limit (mm) | Preheating section target furnace gas temperature (± 50 ℃) | One section of adding target furnace gas temperature (± 40 ℃) | Two section of adding target furnace gas temperatures (± 30 ℃) | Three section of adding target furnace gas temperatures (± 30 ℃) | Soaking zone target furnace gas temperature (± 20 ℃) | Minimum time inside furnace (minute) |
| 180 | 250 | -20 | 400 | 1250 | 1380 | 750 | 1220 | 1260 | 1270 | 1270 | 165 |
| 180 | 250 | -20 | 400 | 1175 | 1250 | 750 | 1220 | 1260 | 1270 | 1270 | 165 |
| 180 | 250 | -20 | 400 | 800 | 1175 | 750 | 1220 | 1290 | 1300 | 1300 | 165 |
| 180 | 250 | 400 | 1000 | 1250 | 1380 | 780 | 1230 | 1260 | 1270 | 1270 | 155 |
| 180 | 250 | 400 | 1000 | 1175 | 1250 | 780 | 1230 | 1290 | 1300 | 1300 | 155 |
| 180 | 250 | 400 | 1000 | 800 | 1175 | 780 | 1230 | 1260 | 1270 | 1270 | 155 |
(2), finishing temperature control strategy:
In described roughing technique, adopt roughing to carry out fast speed rolling, guarantee that roughing extreme trace time temperature is controlled at 1110 ± 30 ℃;
In described finish rolling rolling mill practice, the finish rolling outlet temperature is controlled at (880 ~ 900) ± 20 ℃;
(3), laminar flow temperature control strategy:
In described finish rolling technique processed, adopting the laminar flow type of cooling is that leading portion is cold soon, and the laminar flow outlet temperature is controlled at 630 ± 20 ℃;
(4), mm finishing mill unit strategy of speed control:
Threading speed is controlled: the threading Speed Setting be fast speed rolling to protect the afterbody temperature, the temperature of roughing extreme trace time is 1100 ± 30 ℃, finishing temperature takes temperature to control simultaneously, the head finishing temperature is controlled with 880 ± 20 ℃, guarantees the stable of threading; After threading is complete, the finishing temperature target is controlled according to 900 ± 20 ℃, and between head threading afer bay, cooling water is all opened simultaneously, will be with steel middle part mill speed, brings up to maximum;
Tail speed is controlled: after flying shear after heat inspection inspection is lost, essence dephosphorization rear nozzle is closed immediately, only drop into the front-seat nozzle of smart dephosphorization and carry out dephosphorization, after the 5 ± 1s of time delay simultaneously, the last frame of mm finishing mill unit is decelerated to after 7.5 ± 0.5m/s according to the speed of-0.5 ± 0.1m/s the rolling that remains a constant speed; In the process of slowing down, each frame band steel cooling water Close All of mm finishing mill unit, to guarantee remaining on higher temperature with steel afterbody temperature simultaneously.
Technical scheme also comprises more specifically: in the finish rolling rolling mill practice, comprise rolling line hydraulic control system response synchronism control step: whole AGC oil cylinders is tested, under the uniform pressure effect, measure respectively the moving curve of each AGC oil cylinder, immediate two the AGC oil cylinders of curve are matched, control accuracy the highest relative a pair of AGC oil cylinder is assemblied in to last frame.
Advantage of the present invention is: the whipping rate of thin set of specifications box loading plate drops to current 2% left and right by original 40%, has effectively reduced whipping, has guaranteed the direct motion of rolling; Expand product specification, solved thin specification limit material because mill speed is fast, the operative employee has little time to adjust the problem that causes whipping, realized the steady production of thin set of specifications box loading plate, improved the thin set of specifications box loading plate market competitiveness.
The accompanying drawing explanation
Accompanying drawing is for explaining the present invention.
Fig. 1 is mm finishing mill unit strategy of speed control figure of the present invention.
Fig. 2 is finishing temperature control strategy figure of the present invention.
The specific embodiment
One, the technological process of production of the embodiment of the present invention comprises:
Slab → heating furnace heating → thick dephosphorization → roughing → Coil Box → flying shear → smart dephosphorization → finish rolling rolling → laminar flow is cooling → batches.
Two, the capital equipment that the embodiment of the present invention adopts:
Recuperative heater;
The four roller reversible roughing mills with large edger roll;
Coil Box;
Flying shear;
The seven frame mm finishing mill unit with little edger roll;
3 coiling machines.
Three, rolling line hydraulic control system response synchronism control:
In the finish rolling rolling mill practice, comprise rolling line hydraulic control system response synchronism control step: existing 18 AGC oil cylinders are tested, existing 18 AGC cylinders are tested, under the uniform pressure effect, measure respectively the moving curve of each AGC oil cylinder, draw the moving curve of 18 AGC cylinders, immediate two the AGC oil cylinders of curve are matched, control accuracy the highest relative a pair of AGC oil cylinder is assemblied in to last frame, and by that analogy, to guarantee control accuracy.
Four, heating and temperature control strategy:
Rolling for thin specification, the height of heating-up temperature and uniformity are unusual the key links, for thin set of specifications box loading plate (thickness≤2.0mm), we according to setting parameters such as different production models, slab charging temperatures different heating cycles, effectively guaranteed heating quality, heating and temperature control system of the present invention is as follows:
| Slab thickness lower limit (mm) | The slab thickness upper limit (mm) | The charging temperature lower limit (℃) | The charging temperature upper limit (℃) | Coil of strip target width lower limit (mm) | The coil of strip target width upper limit (mm) | Preheating section target furnace gas temperature (± 50 ℃) | One section of adding target furnace gas temperature (± 40 ℃) | Two section of adding target furnace gas temperatures (± 30 ℃) | Three section of adding target furnace gas temperatures (± 30 ℃) | Soaking zone target furnace gas temperature (± 20 ℃) | Minimum time inside furnace (minute) |
| 180 | 250 | -20 | 400 | 1250 | 1380 | 750 | 1220 | 1260 | 1270 | 1270 | 165 |
| 180 | 250 | -20 | 400 | 1175 | 1250 | 750 | 1220 | 1260 | 1270 | 1270 | 165 |
| 180 | 250 | -20 | 400 | 800 | 1175 | 750 | 1220 | 1290 | 1300 | 1300 | 165 |
| 180 | 250 | 400 | 1000 | 1250 | 1380 | 780 | 1230 | 1260 | 1270 | 1270 | 155 |
| 180 | 250 | 400 | 1000 | 1175 | 1250 | 780 | 1230 | 1290 | 1300 | 1300 | 155 |
| 180 | 250 | 400 | 1000 | 800 | 1175 | 780 | 1230 | 1260 | 1270 | 1270 | 155 |
Five, finishing temperature control strategy:
In described roughing technique, adopt roughing to carry out fast speed rolling, guarantee that roughing extreme trace time temperature is controlled at 1110 ± 30 ℃;
In described finish rolling rolling mill practice, the finish rolling outlet temperature is controlled at (880 ~ 900) ± 20 ℃;
Six, laminar flow temperature control strategy:
In described finish rolling technique processed, adopting the laminar flow type of cooling is that leading portion is cold soon, and the laminar flow outlet temperature is controlled at 630 ± 20 ℃;
Seven, mm finishing mill unit strategy of speed control:
Threading speed is controlled: the threading Speed Setting be fast speed rolling to protect the afterbody temperature, the temperature of roughing extreme trace time is 1100 ± 30 ℃, finishing temperature takes temperature to control simultaneously, the head finishing temperature is controlled with 880 ± 20 ℃, guarantees the stable of threading; After threading is complete, the finishing temperature target is controlled according to 900 ± 20 ℃, simultaneously after the head threading between the F1-F6 frame cooling water all open, bring up to maximum with mill speed in the middle part of be with steel;
Tail speed is controlled: after flying shear after heat inspection inspection is lost, essence dephosphorization rear nozzle is closed immediately, only drop into the front-seat nozzle of smart dephosphorization and carry out dephosphorization, after the 5 ± 1s of time delay simultaneously, the last frame of mm finishing mill unit is decelerated to after 7.5 ± 0.5m/s according to the speed of-0.5 ± 0.1m/s the rolling that remains a constant speed; Simultaneously in the process of slowing down, each frame band steel cooling water Close All of mm finishing mill unit, to guarantee remaining on higher temperature with steel afterbody temperature, relatively low like this throwing steel speed is conducive to the tuningout of operative employee to afterbody, has reduced greatly the accidents such as afterbody rolls brokenly, breaks.
Its final rolling temperature control strategy and strategy of speed control figure refer to Fig. 1 and Fig. 2.
Claims (2)
1. a ultra-thin gauge rolling container plate End-Management method, the thin set of specifications box loading plate that is 1.2mm-2.0mm for the production of thickness, the technological process of production comprises: slab → heating furnace heating → thick dephosphorization → roughing → Coil Box → flying shear → smart dephosphorization → finish rolling rolling → laminar flow is cooling → and batches, it is characterized in that: take following control strategy to be controlled:
(1), heating and temperature control strategy:
In described heating furnace heating process, according to production model, slab charging temperature, be set as follows temperature system:
(2), finishing temperature control strategy:
In described roughing technique, adopt roughing to carry out fast speed rolling, guarantee that roughing extreme trace time temperature is controlled at 1110 ± 30 ℃;
In described finish rolling rolling mill practice, the finish rolling outlet temperature is controlled at (880 ~ 900) ± 20 ℃;
(3), laminar flow temperature control strategy:
In described finish rolling technique processed, adopting the laminar flow type of cooling is that leading portion is cold soon, and the laminar flow outlet temperature is controlled at 630 ± 20 ℃;
(4), mm finishing mill unit strategy of speed control:
Threading speed is controlled: the threading Speed Setting be fast speed rolling to protect the afterbody temperature, the temperature of roughing extreme trace time is 1100 ± 30 ℃, finishing temperature takes temperature to control simultaneously, the head finishing temperature is controlled with 880 ± 20 ℃, guarantees the stable of threading; After threading is complete, the finishing temperature target is controlled according to 900 ± 20 ℃, and between head threading afer bay, cooling water is all opened simultaneously, will be with steel middle part mill speed, brings up to maximum;
Tail speed is controlled: after flying shear after heat inspection inspection is lost, essence dephosphorization rear nozzle is closed immediately, only drop into the front-seat nozzle of smart dephosphorization and carry out dephosphorization, after the 5 ± 1s of time delay simultaneously, the last frame of mm finishing mill unit is decelerated to after 7.5 ± 0.5m/s according to the speed of-0.5 ± 0.1m/s the rolling that remains a constant speed; In the process of slowing down, each frame band steel cooling water Close All of mm finishing mill unit, to guarantee remaining on higher temperature with steel afterbody temperature simultaneously.
2. the control method of thin set of specifications box loading plate whipping according to claim 1, it is characterized in that: in the finish rolling rolling mill practice, comprise rolling line hydraulic control system response synchronism control step: whole AGC oil cylinders is tested, under the uniform pressure effect, measure respectively the moving curve of each AGC oil cylinder, immediate two the AGC oil cylinders of curve are matched, control accuracy the highest relative a pair of AGC oil cylinder is assemblied in to last frame.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104148384A (en) * | 2014-08-21 | 2014-11-19 | 柳州钢铁股份有限公司 | Rolling technology method for ultra-thin ultra-wide steel plate |
| CN106269864A (en) * | 2016-08-30 | 2017-01-04 | 江苏省沙钢钢铁研究院有限公司 | A kind of method improving Thin container plate hot rolling stability |
| CN111545569A (en) * | 2020-05-20 | 2020-08-18 | 江苏华伟特种薄板有限公司 | Rolling process of low-manganese low-alloy steel plate |
| CN112170505A (en) * | 2019-07-04 | 2021-01-05 | 上海梅山钢铁股份有限公司 | Roughing mill speed control method for improving rolling stability of thin specifications |
| CN114618895A (en) * | 2022-04-11 | 2022-06-14 | 福建三宝特钢有限公司 | Hot rolled strip rolling system based on dynamic adjustment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104148384A (en) * | 2014-08-21 | 2014-11-19 | 柳州钢铁股份有限公司 | Rolling technology method for ultra-thin ultra-wide steel plate |
| CN104148384B (en) * | 2014-08-21 | 2016-04-20 | 柳州钢铁股份有限公司 | The rolling mill practice method of ultra-thin ultra-wide steel plate |
| CN106269864A (en) * | 2016-08-30 | 2017-01-04 | 江苏省沙钢钢铁研究院有限公司 | A kind of method improving Thin container plate hot rolling stability |
| CN106269864B (en) * | 2016-08-30 | 2018-03-06 | 江苏省沙钢钢铁研究院有限公司 | A kind of method for improving Thin container plate hot rolling stability |
| CN112170505A (en) * | 2019-07-04 | 2021-01-05 | 上海梅山钢铁股份有限公司 | Roughing mill speed control method for improving rolling stability of thin specifications |
| CN112170505B (en) * | 2019-07-04 | 2023-02-28 | 上海梅山钢铁股份有限公司 | Roughing mill speed control method for improving rolling stability of thin specifications |
| CN111545569A (en) * | 2020-05-20 | 2020-08-18 | 江苏华伟特种薄板有限公司 | Rolling process of low-manganese low-alloy steel plate |
| CN114618895A (en) * | 2022-04-11 | 2022-06-14 | 福建三宝特钢有限公司 | Hot rolled strip rolling system based on dynamic adjustment |
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