CN101829688A - Cooling method of heavy and medium plate controlled rolling intermediate blank - Google Patents
Cooling method of heavy and medium plate controlled rolling intermediate blank Download PDFInfo
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Abstract
The invention belongs to a producing and cooling technique of rolled steel, relating to a cooling method of a heavy and medium plate controlled rolling intermediate blank, which can be realized by both a single-stand heavy and medium plate roll and a double-stand heavy and medium plate roll. The cooling method comprises the following steps of: transmitting a roughly rolled intermediate blank with the thickness range of 30-110 mm in an austenite recrystallization zone into an intermediate controlled cooling zone from a transmission roller way for rapidly cooling to 800-950 DEG C, and then transmitting the intermediate blank into the roll for rolling in a non- recrystallization zone after short-time air cooling and temperature evening. In the intermediate cooling process, an upper collecting pipe and a lower collecting pipe with high density or ultra-high density are adopted to impact, jet and cool the intermediate blank, and specific technological parameters are accurately controlled by a computer. Water is cooling water for the roll with the pressure of 0.3-1.0 MPa in a common water circulating system for workshops. The intermediate cooling holding time is 30-70% shorter than that of the conventional process so that the production efficiency is improved, and due to austenite grain refinement after intermediate controlled cooling, the mechanical properties of a steel plate can be improved.
Description
Technical field
The invention belongs to steel rolling and produce cooling technology, particularly a kind of cooling means of cut deal controlled rolling intermediate blank.
Background technology
For improving the intensity and the toughness of steel; pass through controlled rolling refine austenite crystal grain or increase the dislocation movement by slip band of deformed austenite crystal grain inside; promptly increase effective grain boundary area; the ferrite forming core provides nucleation site more, that more disperse during for phase transformation, obtains ferrite and the pearlite or the bainite structure of tiny dispersion.The refinement ferrite crystal grain can not only improve the intensity of steel, and improves the toughness of steel.Yet traditional controlled rolling theoretical developments does not surmount three phases controlled rolling technology so far all the time, that is: the austenite recrystallization district is rolling, austenite non-recrystallization district is rolling and α+γ two-phase section is rolling.Because of α+γ two-phase section rolling temperature angle, resistance of deformation is big, considers adverse effect that mill load is brought, and industry is actual, and what generally adopt is with the rolling rough rolling step in austenite recrystallization district with the rolling finish rolling stage of austenite non-recrystallization district.This just means that the controlled rolling process must be avoided the part recrystallization zone in the middle of roughing and finish rolling, reduce the negative effect that mixed grain structure brings to mechanical property with maximization.
At present, generally adopt both at home and abroad the steel plate that allows after the roughing treat that the method for temperature carries out finish rolling until temperature drop to the non-recrystallization district transmitting the roller-way air cooling.Slow because of cooling off cooling rate in the air, length consuming time, the milling train rhythm of production is slow, has seriously restricted the business efficiency that iron and steel is produced.
Patent of invention " a kind of intermediate blank cooling system and cooling control technology " (application number/patent No.: 200910104025) disclose a kind of intermediate blank cooling system, it is characterized in that: between roughing mill and finishing mill, aerosol cooling device body is set.Described aerosol cooling device body is made up of top cooling manifold and bottom cooling manifold, and aerial fog nozzle and compressed air hose are installed on the cooling water pipe of top cooling manifold and bottom cooling manifold; The open and close control valve of cooling water pipe and compressed air hose is connected with the control valve station with flow control valve.Near the cooling manifold that is provided with the roller-way before and after the milling train is controlled intermediate blank aerosol process for cooling by the water smoke control technology that cooling manifold is sprayed.This invention can be used for the Heavy Plate Production line.
At cut deal especially Wide and Thick Slab production field, because the cooling procedure temperature drop is very slow, steel plate thickness direction and width uniformity are controlled characteristics such as difficulty is big, and the realization that control is cooled off to intermediate blank has brought many difficult problems.The intermediate blank cooling system of aerosol methods for cooling recited above, equipment are comparatively complicated, and the cleanliness factor and the pressure control range in gas circuit, water route are had relatively high expectations, and cause whole investment bigger, have limited its use to a certain extent.
Summary of the invention
Purpose of the present invention provides a kind of time of staying temperature of intermediate blank in the middle of roughing and finish rolling roller-way that reduce, and accelerates rolling rhythm, suitable cut deal intermediate blank control cooling (IC) process of enhancing productivity.
Technical scheme of the present invention is: a kind of cooling means of cut deal controlled rolling intermediate blank is characterized in that: specifically may further comprise the steps:
Step 1: the steel billet after will heating is sent into milling train by transmission roller channel and is carried out roughing, is 1000～1180 ℃ austenite recrystallization district in rolling temperature, and it is 30～110mm intermediate blank that billet rolling is become thickness;
Step 2: the intermediate blank after rolling in the above-mentioned steps is conveyed into intermediate blank control cooling zone by roller-way again, by collector intermediate blank is implemented impact jet flow control cooling with high density, ultra dense degree arrangement of nozzles form, cooling velocity is controlled at 1～10 ℃/s, be cooled to 800～950 ℃ austenite non-recrystallization district, enter milling train behind the suitable air cooling samming of intermediate blank afterwards and carry out finish rolling.
The water quality of cooling impact jet flow water adopts the milling train cooling water in the middle of described, and cooling water pressure is 0.3～1.0MPa.
Described form of nozzle is the upper header and the lower collector pipe of high density, ultra dense degree.
Based on preceding method, the present invention uses the milling train cooling water by the collector with high density, ultra dense degree arrangement of nozzles form intermediate blank to be implemented the cooling of impact jet flow water management, the methods for cooling of the employing aerosol cooling device that this methods for cooling contrast is above-mentioned has remarkable advantages, have that equipment is simple, investment is little, the characteristics of wide accommodation, especially have outstanding effect at the control of cut deal plate shape.
The collector that employing has high density, a ultra dense degree arrangement of nozzles form is implemented the major advantage that the impact jet flow water cooling has in the present invention and is comprised:
(1) because the cooling manifold of dispersed placement is difficult for the surface of steel plate sub-cooled takes place, make steel plate thickness direction cooling raio more even, this advantage is very important for slab.
(2) nozzle on the collector has adopted the arrangement form of high density, ultra dense degree, helps strengthening the cooling uniformity of surface of steel plate.
(3) can improve the uniformity of cooling off on the plate width direction with comparalive ease by the methods such as arranged crosswise that the cooling manifold top nozzle in the variation of the variation of width caliber or injector spacing, is respectively arranged nozzle.
(4) device manufacturing process is simple, and is easy to maintenance, low to requirements in water quality, and flow stability is good.
(5) cooling capacity is regulated more flexibly, and the flow adjustment range broad can adopt the means of adjusting discharge or change the means that collector group number combines and improve the control accuracy of steel plate chilling temperature and adjust cooling velocity.
(6) can adopt continuous cooling or cool off two kinds of modes of operation simultaneously.
Setting-out mainly contains following advantage in the present invention in the cooling of use milling train:
(1) to quality of cooling water require lowly, can directly use the existing milling train cooling water in workshop, the cooling water after the use directly enters the workshop circulation, greatly reduces the investment of water system.
(2) controlled pressure of setting-out is 0.3～1.0MPa in the impact jet flow cooling, the available pressure wide ranges.
(3) intensity of cooling is big, the utilization rate height of cooling water.Under identical specific water's condition, it is big to have a heat that the cooling water unit volume of certain pressure takes away, and has strengthened the shared ratio of nucleate boiling heat transfer, and the coefficient of heat transfer is improved, and cooling velocity is fast, especially can satisfy thick specification intermediate blank and require cooling capacity faster.
Apparatus of the present invention extensively are suitable for cut deal steel rolling production field, and are applied widely, are fit to different mills and arrange needs, both can be in two-shipper frame heavy and medium plate mill workshop mounting arrangements, and again can be in single chassis front and back mounting arrangements.
Description of drawings
Accompanying drawing 1 is treated the structural representation of warm technology for roughing and finish rolling delay table or bypass roller-way tradition.
Accompanying drawing 2 is for being provided with intermediate blank control cooling (IC) device schematic diagram in the middle of roughing of the present invention and the finish rolling.
Accompanying drawing 3 is for being provided with intermediate blank control cooling (IC) device schematic diagram after the finish rolling of the present invention.
Accompanying drawing 4 is for being provided with intermediate blank control cooling (IC) device schematic diagram after the single chassis of the present invention.
Accompanying drawing 5 is for being provided with intermediate blank control cooling (IC) device schematic diagram before the single chassis of the present invention.
Among the figure:
1. roughing mill 4. is treated warm roller-way
2. finishing mill 5. milling trains
3. intermediate blank is controlled cooling device
The specific embodiment
Different installation can be selected according to mill milling train flexible arrangement by each iron and steel manufacturer.Accompanying drawing 2 and accompanying drawing 3 are fit to two-shipper frame heavy and medium plate mill to be arranged, accompanying drawing 3 and accompanying drawing 4 are fit to the single chassis heavy and medium plate mill to be arranged, it is similar specifically to implement intermediate blank control cooling procedure method.
Embodiment one: to produce the tank plate of 12mm thickness, the intermediate blank control cooling technology that adopts accompanying drawing 2 to arrange is that example further describes its process.Steel billet is heated to 1200 ℃, and by transmission roller channel blank being sent into roughing mill (1), to carry out crystallization more rolling, and the roughing final temperature is controlled at 1020 ℃, is rolled into the intermediate blank that thickness is 30mm, accumulation drafts＞50% of recrystallization zone.Intermediate blank enters intermediate blank control cooled region (3) by transmission roller channel after going out roughing mill, be quickly cooled to the non-recrystallization zone, the impact jet flow water-cooling pattern that adopts high density, ultra dense degree collector is to the intermediate blank cooling of spraying water, cooling velocity is controlled at 1 ℃/s, be cooled to 800 ℃, concrete technological parameter is carried out accurately control by computer.Middle cooling water adopts the milling train cooling water in the public water circulatory system of workshop, and pressure of supply water is 0.4MPa.Intermediate blank after the control cooling directly enters finishing mill (2) through approach table and is rolled, and finish rolling accumulation drafts＞60% is rolled into thickness 12mm steel plate.In the middle of adopting after the control cooling, the time of staying temperature routine that contracts treats that warm technology is short nearly 70%, and the ballistic work of steel plate improves more than 20%.
Embodiment two: to produce the X80 pipe line steel of 14.7mm thickness, the intermediate blank control cooling technology that adopts accompanying drawing 2 to arrange is that example further describes its process.Steel billet is heated to 1200 ℃, by transmission roller channel blank is sent into roughing mill (1) and carry out high temperature crystallization is rolling again, the high temperature rolling final temperature of crystallization again is controlled at 1100 ℃, is rolled into the intermediate blank that thickness is 50mm, accumulation drafts＞50% of recrystallization zone.Intermediate blank enters intermediate blank control cooled region (3) by transmission roller channel after going out roughing mill, be quickly cooled to the non-recrystallization temperature province, the impact jet flow water-cooling pattern of high density, ultra dense degree collector is adopted in middle cooling, to the intermediate blank cooling of spraying water, cooling velocity is controlled at 5 ℃/s, be cooled to 900 ℃, concrete technological parameter is carried out accurately control by computer.The milling train cooling water in the public water circulatory system of workshop is adopted in middle cooling, and pressure of supply water is 0.6MPa.Enter finishing mill (2) behind the suitable air cooling samming of intermediate blank after the control cooling and be rolled, the finish rolling start rolling temperature is controlled at 920 ℃, finish rolling accumulation drafts＞60%, and finished steel plate thickness 14.7mm takes to roll back control cooling after the finish rolling.In the middle of adopting after the control cooling, the time of staying temperature routine that contracts treats that warm technology is short nearly 70%, and it is more tiny by 30%～50% than conventional controlled rolling mode to implement quick intermediate blank control cooling back austenite crystal, and ballistic work improves 15%.
Embodiment three: the DH36 deck of boat steel with production 50mm thickness is an example, the intermediate blank control cooling technology that adopts accompanying drawing 5 to arrange.The steel billet that heats is sent into milling train (1), and to carry out the recrystallization zone of rough rolling step rolling, and the final temperature of rough rolling step is 1180 ℃, and the smart rough rolling step of steel billet is rolled into the intermediate blank that thickness is 110mm.Intermediate blank enters the preceding intermediate blank control cooled region (2) of milling train (1) machine by transmission roller channel again and is controlled at 10 ℃/s through too fast cooling velocity, speed is cooled to 950 ℃, middle cooling procedure adopts the milling train cooling water of pressure 0.4～1.0MPa, and having lower collector pipe impact jet flow water-cooling pattern on high density, the ultra dense degree nozzle, technological parameter is carried out accurately control by computer.Intermediate blank is through middle control cooling, suitably entering milling train behind the air cooling, to carry out the non-recrystallization district rolling, is rolled down to the finished product thickness near 50mm, finish rolling stage accumulation drafts＞50%, finishing temperature is controlled at about 820 ℃, and control is cooled to 630-680 ℃ after rolling afterwards.This method can make time of staying temperature shorten 〉=30%, and it is more tiny by 30% than conventional controlled rolling mode to implement quick intermediate blank control cooling back austenite crystal, and ballistic work improves 30%.
Claims (3)
1. the cooling means of a cut deal controlled rolling intermediate blank is characterized in that: specifically may further comprise the steps:
Step 1: the steel billet after will heating is sent into milling train by transmission roller channel and is carried out roughing, is 1000～1180 ℃ austenite recrystallization district in rolling temperature, and it is 30～110mm intermediate blank that billet rolling is become thickness;
Step 2: the intermediate blank after rolling in the above-mentioned steps is conveyed into intermediate blank control cooling zone by roller-way again, by collector intermediate blank is implemented impact jet flow control cooling with high density, ultra dense degree arrangement of nozzles form, cooling velocity is controlled at 1～10 ℃/s, be cooled to 800～950 ℃ austenite non-recrystallization district, enter milling train behind the suitable air cooling samming of intermediate blank afterwards and carry out finish rolling.
2. the cooling means of cut deal controlled rolling intermediate blank according to claim 1 is characterized in that: the water quality of cooling impact jet flow water adopts the milling train cooling water in the middle of described, and cooling water pressure is 0.3～1.0MPa.
3. the cooling means of cut deal controlled rolling intermediate blank according to claim 1 is characterized in that: described form of nozzle is the upper header and the lower collector pipe of high density, ultra dense degree.
Priority Applications (1)
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| CN 201010194568 CN101829688A (en) | 2010-05-28 | 2010-05-28 | Cooling method of heavy and medium plate controlled rolling intermediate blank |
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| CN 201010194568 CN101829688A (en) | 2010-05-28 | 2010-05-28 | Cooling method of heavy and medium plate controlled rolling intermediate blank |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102151696A (en) * | 2010-12-28 | 2011-08-17 | 西部钛业有限责任公司 | Temperature control rolling method for Q345 steel plate |
| CN102189100A (en) * | 2011-03-08 | 2011-09-21 | 青岛钢铁控股集团有限责任公司 | Steel rolling device |
| CN102409260A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | Thick plate with good low-temperature toughness for pressure container and production method of thick plate |
| CN102527734A (en) * | 2012-02-27 | 2012-07-04 | 宝山钢铁股份有限公司 | Steel plate controlling and rolling method |
| CN104138911A (en) * | 2014-05-27 | 2014-11-12 | 南京钢铁股份有限公司 | Method for rapid water-cooling temperature control on intermediate blank of medium thick plate |
| CN104492826A (en) * | 2014-12-16 | 2015-04-08 | 中冶赛迪工程技术股份有限公司 | Temperature-controlled rolling line for large-sized and medium-sized rolled workpieces and temperature-controlled rolling process |
| CN104942026A (en) * | 2015-06-16 | 2015-09-30 | 河北钢铁股份有限公司邯郸分公司 | Moderate-thickness plate temperature-control rolling process making efficient use of lateral temperature waiting roll tables |
| CN105215058A (en) * | 2014-06-27 | 2016-01-06 | 宝山钢铁股份有限公司 | The control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines |
| CN105855305A (en) * | 2016-05-26 | 2016-08-17 | 钢铁研究总院华东分院 | Cooling equipment between racks and hot core rolling technology |
| CN106964655A (en) * | 2017-05-31 | 2017-07-21 | 攀钢集团西昌钢钒有限公司 | A kind of hot-rolled intermediate billet cooling means and cooling device |
| CN111069307A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN111589880A (en) * | 2020-04-29 | 2020-08-28 | 东北大学 | Control method for improving structure uniformity of on-line cooling process of medium-thickness wall seamless steel pipe |
| CN113245377A (en) * | 2021-06-23 | 2021-08-13 | 宝钢湛江钢铁有限公司 | Layout structure of sectional type thick plate intermediate cooling process and use method |
| CN115090669A (en) * | 2022-05-07 | 2022-09-23 | 江苏沙钢集团淮钢特钢股份有限公司 | Efficient bar controlled rolling method |
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| CN102409260A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | Thick plate with good low-temperature toughness for pressure container and production method of thick plate |
| CN102151696A (en) * | 2010-12-28 | 2011-08-17 | 西部钛业有限责任公司 | Temperature control rolling method for Q345 steel plate |
| CN102189100A (en) * | 2011-03-08 | 2011-09-21 | 青岛钢铁控股集团有限责任公司 | Steel rolling device |
| CN102189100B (en) * | 2011-03-08 | 2013-03-20 | 青岛钢铁控股集团有限责任公司 | Steel rolling device |
| CN102527734A (en) * | 2012-02-27 | 2012-07-04 | 宝山钢铁股份有限公司 | Steel plate controlling and rolling method |
| CN102527734B (en) * | 2012-02-27 | 2014-10-29 | 宝山钢铁股份有限公司 | Steel plate controlling and rolling method |
| CN104138911B (en) * | 2014-05-27 | 2016-06-29 | 南京钢铁股份有限公司 | A kind of method of cut deal intermediate blank rapid water cooling temperature control |
| CN104138911A (en) * | 2014-05-27 | 2014-11-12 | 南京钢铁股份有限公司 | Method for rapid water-cooling temperature control on intermediate blank of medium thick plate |
| CN105215058B (en) * | 2014-06-27 | 2017-02-22 | 宝山钢铁股份有限公司 | Control method for temperature reduction of steel plates in medium-thickness plate rolling production line process |
| CN105215058A (en) * | 2014-06-27 | 2016-01-06 | 宝山钢铁股份有限公司 | The control method that the temperature of a kind of steel plate in Medium and Heavy Plate Rolling Production line process declines |
| CN104492826A (en) * | 2014-12-16 | 2015-04-08 | 中冶赛迪工程技术股份有限公司 | Temperature-controlled rolling line for large-sized and medium-sized rolled workpieces and temperature-controlled rolling process |
| CN104492826B (en) * | 2014-12-16 | 2016-08-24 | 中冶赛迪工程技术股份有限公司 | Big specification rolled piece temperature-controlled rolling technique in one |
| CN104942026A (en) * | 2015-06-16 | 2015-09-30 | 河北钢铁股份有限公司邯郸分公司 | Moderate-thickness plate temperature-control rolling process making efficient use of lateral temperature waiting roll tables |
| CN105855305B (en) * | 2016-05-26 | 2018-06-15 | 钢研晟华科技股份有限公司 | Interstand cooling is equipped and earnest rolling mill practice |
| CN105855305A (en) * | 2016-05-26 | 2016-08-17 | 钢铁研究总院华东分院 | Cooling equipment between racks and hot core rolling technology |
| CN106964655A (en) * | 2017-05-31 | 2017-07-21 | 攀钢集团西昌钢钒有限公司 | A kind of hot-rolled intermediate billet cooling means and cooling device |
| CN111069307A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN111069307B (en) * | 2019-12-09 | 2021-08-20 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN111589880A (en) * | 2020-04-29 | 2020-08-28 | 东北大学 | Control method for improving structure uniformity of on-line cooling process of medium-thickness wall seamless steel pipe |
| CN111589880B (en) * | 2020-04-29 | 2021-09-28 | 东北大学 | Control method for improving structure uniformity of on-line cooling process of medium-thickness wall seamless steel pipe |
| CN113245377A (en) * | 2021-06-23 | 2021-08-13 | 宝钢湛江钢铁有限公司 | Layout structure of sectional type thick plate intermediate cooling process and use method |
| CN113245377B (en) * | 2021-06-23 | 2022-05-03 | 宝钢湛江钢铁有限公司 | Sectional type thick plate intermediate cooling process layout structure and using method |
| CN115090669A (en) * | 2022-05-07 | 2022-09-23 | 江苏沙钢集团淮钢特钢股份有限公司 | Efficient bar controlled rolling method |
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Open date: 20100915 |