CN101792847A - Direct thermal treatment process technology after rolling steel plate - Google Patents
Direct thermal treatment process technology after rolling steel plate Download PDFInfo
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- CN101792847A CN101792847A CN200910103141A CN200910103141A CN101792847A CN 101792847 A CN101792847 A CN 101792847A CN 200910103141 A CN200910103141 A CN 200910103141A CN 200910103141 A CN200910103141 A CN 200910103141A CN 101792847 A CN101792847 A CN 101792847A
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Abstract
The invention belongs to the technical field of metallurgy, in particular to a direct thermal treatment process technology after rolling a steel plate. The invention provides the direct thermal treatment process technology after rolling the steel plate, which can overcome the deficiencies of the prior art. The process technology comprises the steps of heating the steel plate on an outlet roller way of a rolling machine for quenching mainly, using a steel plate electromagnetic induction heating device arranged on the outlet roller way between a medium and heavy plate finish rolling machine and a post-rolling controlled cooling device which is a direct quenching and accelerated cooling device for heating and soaking the steel plate passing through the steel plate electromagnetic induction heating device according to the process requirements, and improving the flatness and the plate shape of the steel plate through a straightening roller matched with the electromagnetic induction heating device. The steel plate electromagnetic induction heating device with the straightening roller is arranged on the roller way between the medium and heavy plate finish rolling machine and the cooling device. The process technology can realize the one-line quenching thermal treatment process of the steel plates with various specifications. The process technology is applicable to new construction and transformation projects of medium and heavy plate plants. The process way and the devices have important popularization value.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of direct thermal treatment process technology after rolling steel plate.
Background technology
Plate of moderate thickness can adopt accelerated cooling device (ACC) that steel plate is cooled off behind mill milling as required at present, and control metal inside grain size and internal organizational structure reach the purpose that improves plate property.Part is quickened cooling technology and has also been disposed the high speed cooling of strong cold section higher realization of speed of cooling to steel plate, and expectation reaches the purpose of direct quenching (DQ), and alternative off-line quenching heat treatment production line is saved the energy consumption of a large amount of thermal treatment second-heating.
Existing plate of moderate thickness rolls acceleration cooling (ACC) and collector cooling and high-pressure nozzle water spray bonded mode are mainly adopted in direct quenching (DQ).In order to improve the plate shape of cooling front spring, indivedual producers have adopted the pre-straightening machine.In order to utilize the waste heat of cooling back steel plate, the JFE factory of Japan has developed online heat treatment technics (HOP) and has been used for cooling off the tempering of back steel plate.
Relevant technology is summarized as follows:
A) laminar flow collector cooling technology is the technology that extensively adopts both at home and abroad at present, and this technology is quickened the cooling (ACC) except that being used for plate of moderate thickness, also is applied in maturely in the laminar flow cooling of hot rolled strip.Be characterized in cooling evenly, cooling intensity is less.
B) high-pressure nozzle water spray cooling technology is mainly used in the direct quenching cooling of quickening before the cooling section (DQ), has adopted high-pressure nozzle as the DQ of SMS, and it is strong to be characterized in that water coolant penetrates the ability of surface of steel plate steam film, the speed of cooling height.
C) the pre-straightening machine is arranged in the cooling section inlet, and main application is that the steel plate after rolling is carried out hot-leveling, guarantees steel plate refrigerative homogeneity.The pre-straightening machine is different from conventional thermal straightening machine, and thermal straightening machine also will be taken into account the unrelieved stress of eliminating steel plate.The minority medium plate mill is provided with the pre-straightening machine.
D) intermediate blank well heater (Bar Heater) is the technology that is used to improve rolled piece temperature reduction along its length phenomenon of Toshiba Corp (TOSHIBA) exploitation, its principle is by electromagnetic induction intermediate blank to be heated, be arranged on the inlet of hot strip mill finishing mill, can be with 70 ℃ of the maximum raisings of the afterbody temperature of rolled piece, the existing many cover application examples of this device.
E) online heat treatment technics (HOP) is at the existing example of using of the Heavy Plate Plant of Japanese JFE company, and device is between accelerated cooling device and cold bed, and its principle is by electromagnetic induction cooled steel plate to be carried out the tempering heating, realizes online tempering.
E) conventional quenching heat-treatment production line (offline mode) is the routine configuration of Heavy Plate Plant, large number quipments such as cuts by roller hearth heat-treated furnace, quenching press, front and back roller-way, cold bed and shot-blasting machine, sampling and forms.Need to adopt the steel plate with after the finishing shearing to be heated to 950～880 ℃ by room temperature, then steel plate is delivered to fast quenching press and be quenched into below 400 ℃, air cooling is to room temperature then.Steel plate after the quenching also needs temper, and quenching+tempered is called to adjust to be handled.
But the practice of producing shows that present direct quenching technical limitation is very big, does not substitute off-line quenching heat treatment production line.Major cause has three, and the first, the temperature that quench treatment requires steel plate to begin to cool down is higher, and the scope of requirement is 950～880 ℃, and purpose makes the steel plate grain structure that enough condensate depression be arranged in the cooling phase-change process, guarantees the formation of hardening capacity and quenching structure; Present direct quenching technology is that the steel plate finishing temperature after rolling is quenched, and the finishing temperature of the steel plate that thickness is less generally all is lower than below 880 ℃, adopts the steel plate of controlled rolling also may be lower than 800 ℃, and product does not reach the performance of regulation; The second, the head and tail temperature difference of rolling back steel plate influences the cooled performance of steel plate, adopts the mode that shortens length of rolled piece usually in order to dwindle head and tail temperature difference.The 3rd, rolling back will directly influence the steel plate cooling uniformity without the flatness defect of the steel plate of hot straightening, and the steel plate after the quenching can not be eliminated flatness defect by aligning again, will influence quality product.
Summary of the invention
The invention provides a kind of direct thermal treatment process technology after rolling steel plate, can overcome the deficiencies in the prior art.The present invention on milling train outlet roller-way to the steel plate heating and be mainly used in quenching, at the steel plate finishing mill with roll on the outlet roller-way between back controlled chilling equipment-direct quenching and the accelerated cooling device, by the steel plate electromagnetic induction heater that is provided with, requirement according to technology is heated and soaking the steel plate that passes through, and by improving the planeness and the plate shape of steel plate with the supporting straightening roll of electromagnetic induction heater.On the roller-way between plate of moderate thickness finishing mill and the refrigerating unit, band straightening roll steel plate electromagnetic induction heater is set.
The present invention is on the roller-way between plate of moderate thickness finishing mill and the refrigerating unit (direct quenching and acceleration cooling), band straightening roll steel plate electromagnetic induction heater is set, according to processing requirement the steel plate that passes through is heated and soaking, and by improving the planeness and the plate shape of steel plate with the supporting straightening roll of electromagnetic induction heater.The technology of the present invention adopts different patterns at the online direct quenching of steel plate with conventional controlled chilling, when steel plate needs press quenching, straightening roll is aligned steel plate, steel plate during electromagnetic induction heater will proceed slowly heats and is soaked to the quenching temperature that needs, and enters the cooling of quench cooled section then; When steel plate needed conventional controlled chilling, electromagnetic induction heater can not devoted oneself to work, and can carry out temperature compensation to the afterbody of steel plate yet, guaranteed that steel plate organizes cooled homogeneity; Need the heat treated steel plate of normalizing to be heated to 930～860 ℃ of air coolings then by electromagnetic induction heater.
Advantage of the present invention is as follows:
The first, the steel plate that just leaves milling train is carried out rapid heating, improve the temperature that steel plate enters refrigerating unit, satisfy the temperature of the online direct quenching needs of steel plate of all thickness specification, because heat-up time, weak point can avoid steel plate to organize grain growth; The second, the head and tail temperature difference of steel plate is compensated, improve steel billet temperature and make through quickening cooling (ACC) and direct quenching device (DQ) refrigerative plate property more even; The 3rd, adopt multi-roll straightener to improve the steel plate planeness, improve steel plate refrigerative homogeneity.
The present invention farthest substitutes plate of moderate thickness off-line quench treatment line, saves the investment and the energy, and electromagnetic induction heater has that heating efficiency is strong, speed fast, the temperature precise control, little characteristics take up room.Be applicable in the newly-built and transformation project of Heavy Plate Plant and adopt.Technology mode of the present invention and device have important promotional value.
Description of drawings
Accompanying drawing is a process principle figure of the present invention
Among the figure, part 1 is a milling train, and part 2 is a steel plate, and part 3 is the electrical induction heating device of band straightening roll, and part 4 is DQ and ACC refrigerating unit
Embodiment
The electrical induction heating device 3 of mounting strap straightening roll between milling train 1 and DQ and ACC refrigerating unit 4, the forward and backward straightening roll that disposes of electromagnetic induction heater, the quantity and the particular location of straightening roll are provided with as required, be used to pinch the plate shape of steel plate and the rolling back of improvement steel plate, particularly planeness guarantees the cooling uniformity in the steel plate water cooling process.
Steel plate 2 by milling train 1 after rolling is heat-treated by DQ and ACC refrigerating unit 4 behind the electrical induction heating device 3 of band straightening roll again.
When steel plate needed press quenching, straightening roll was aligned steel plate, and the steel plate during electromagnetic induction heater will proceed slowly heats and is soaked to the quenching temperature that needs, and entered the cooling of quench cooled section then; When steel plate needed conventional controlled chilling, induction heating device can not devoted oneself to work, and can carry out temperature compensation to the afterbody of steel plate yet, guaranteed that steel plate organizes cooled homogeneity; Need the heat treated steel plate of normalizing to be heated to 930～860 ℃ of air coolings then by the electrical induction heating device.
The present invention is at the plate of moderate thickness finishing mill and rolls on the mouth roller-way between back controlled chilling equipment (direct quenching and accelerated cooling device), the steel plate electromagnetic induction heater is set, requirement according to technology is heated and soaking the steel plate that passes through, and by improving the planeness and the plate shape of steel plate with the supporting straightening roll of electromagnetic induction heater.Realize the press quenching thermal treatment process of all size steel plate.
The present invention is greatly improved to the existing postheat treatment state of the art of rolling, can save the energy that a large amount of plate of moderate thickness thermal treatment second-heating needs, might substitute conventional off-line heat treatment quenching process fully, can save the investment of a large amount of heat-treatment production line, electromagnetic induction heater has that heating efficiency is strong, speed fast, the temperature precise control, little characteristics take up room.Be applicable in the newly-built and transformation project of Heavy Plate Plant and adopt.Technology mode of the present invention and device have important promotional value.
Claims (7)
1. direct thermal treatment process technology after rolling steel plate, it is characterized in that: on milling train outlet roller-way to the steel plate heating and be mainly used in quenching, at the steel plate finishing mill with roll on the outlet roller-way between back controlled chilling equipment-direct quenching and the accelerated cooling device, steel plate electromagnetic induction heater by being provided with heats and soaking the steel plate that passes through according to the requirement of technology.
2. direct thermal treatment process technology after rolling steel plate according to claim 1 is characterized in that: by improving the planeness and the plate shape of steel plate with the supporting straightening roll of electromagnetic induction heater.
3. direct thermal treatment process technology after rolling steel plate according to claim 1, it is characterized in that: when steel plate needs press quenching, straightening roll is aligned steel plate, steel plate during electromagnetic induction heater will proceed slowly heats and is soaked to the quenching temperature that needs, and enters the cooling of quench cooled section then; When steel plate needed conventional controlled chilling, electromagnetic induction heater can not devoted oneself to work, and can carry out temperature compensation to the afterbody of steel plate yet, guaranteed that steel plate organizes cooled homogeneity; Need the heat treated steel plate of normalizing to be heated to 930～860 ℃ of air coolings then by electromagnetic induction heater.
4. the equipment of direct thermal treatment process technology after rolling steel plate according to claim 1 is characterized in that: on the roller-way between plate of moderate thickness finishing mill and the refrigerating unit, electromagnetic induction heater is set.
5. the equipment of direct thermal treatment process technology after rolling steel plate according to claim 4, it is characterized in that: configuration straightening roll before the electromagnetic induction heater, be used to pinch the plate shape, particularly planeness of steel plate and the rolling back of improvement steel plate, guarantee the cooling uniformity in the steel plate water cooling process.
6. the equipment of direct thermal treatment process technology after rolling steel plate according to claim 4, it is characterized in that: dispose straightening roll behind the electromagnetic induction heater, be used to pinch the plate shape, particularly planeness of steel plate and the rolling back of improvement steel plate, guarantee the cooling uniformity in the steel plate water cooling process.
7. the equipment of direct thermal treatment process technology after rolling steel plate according to claim 4, it is characterized in that: the forward and backward configuration straightening roll of electromagnetic induction heater, be used to pinch the plate shape of steel plate and the rolling back of improvement steel plate, particularly planeness guarantees the cooling uniformity in the steel plate water cooling process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910103141A CN101792847A (en) | 2009-02-02 | 2009-02-02 | Direct thermal treatment process technology after rolling steel plate |
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| CN200910103141A CN101792847A (en) | 2009-02-02 | 2009-02-02 | Direct thermal treatment process technology after rolling steel plate |
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| CN101792847A true CN101792847A (en) | 2010-08-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041371A (en) * | 2011-01-27 | 2011-05-04 | 北京科技大学 | Heat treatment method of high-tenacity high-strength steel plate |
| CN102643965A (en) * | 2012-05-16 | 2012-08-22 | 湖南华菱湘潭钢铁有限公司 | Production method for reducing surface hardness of steel rod |
| CN106270321A (en) * | 2015-06-08 | 2017-01-04 | 成都市新筑路桥机械股份有限公司 | A kind of push away equipment and the method rolling shaping rail |
| CN109092910A (en) * | 2018-07-24 | 2018-12-28 | 山东钢铁股份有限公司 | A kind of method electromagnetic induction coil compensation heating equipment and its improve mill bar quality |
| WO2020134075A1 (en) * | 2018-12-28 | 2020-07-02 | 太仓岭川实业有限公司 | Pretreatment device and pretreatment method for die steel |
| CN111676355A (en) * | 2020-07-23 | 2020-09-18 | 东北大学 | Online solution treatment process for austenitic stainless steel plate |
-
2009
- 2009-02-02 CN CN200910103141A patent/CN101792847A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041371A (en) * | 2011-01-27 | 2011-05-04 | 北京科技大学 | Heat treatment method of high-tenacity high-strength steel plate |
| CN102643965A (en) * | 2012-05-16 | 2012-08-22 | 湖南华菱湘潭钢铁有限公司 | Production method for reducing surface hardness of steel rod |
| CN106270321A (en) * | 2015-06-08 | 2017-01-04 | 成都市新筑路桥机械股份有限公司 | A kind of push away equipment and the method rolling shaping rail |
| CN109092910A (en) * | 2018-07-24 | 2018-12-28 | 山东钢铁股份有限公司 | A kind of method electromagnetic induction coil compensation heating equipment and its improve mill bar quality |
| WO2020134075A1 (en) * | 2018-12-28 | 2020-07-02 | 太仓岭川实业有限公司 | Pretreatment device and pretreatment method for die steel |
| CN111676355A (en) * | 2020-07-23 | 2020-09-18 | 东北大学 | Online solution treatment process for austenitic stainless steel plate |
| CN111676355B (en) * | 2020-07-23 | 2022-01-28 | 东北大学 | Online solution treatment process for austenitic stainless steel plate |
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Application publication date: 20100804 |