CN1483528A - Three section laminar flow cooling technology for hot rolling band steel - Google Patents

Three section laminar flow cooling technology for hot rolling band steel Download PDF

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Publication number
CN1483528A
CN1483528A CNA021329753A CN02132975A CN1483528A CN 1483528 A CN1483528 A CN 1483528A CN A021329753 A CNA021329753 A CN A021329753A CN 02132975 A CN02132975 A CN 02132975A CN 1483528 A CN1483528 A CN 1483528A
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China
Prior art keywords
laminar flow
band steel
sections
steel
cooling
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Granted
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CNA021329753A
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Chinese (zh)
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CN1216700C (en
Inventor
旭 杨
杨旭
吴晓伟
关菊
杨大军
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Angang Steel Co Ltd
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XINGANGTIE CO Ltd ANSHAN IRON AND STEEL GROUP
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Publication of CN1216700C publication Critical patent/CN1216700C/en
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Abstract

The present invention provides a three-section cooling process by laminar flow for hot-rolled steel strip. Said process adopts the computer laminar flow cooling control, and is characterized by that the steel strip can be divided into three sections for cooling, first section is head portion section whose length is 30 m, second section is intermediate section of the steel strip, and third section is the tail portion section whose length is 20 m, and the cooling temperatures of said three sections are respectively controlled in that its intermediate section temp. is equal to the objective coiling temp., its head portion section temp. is 20-50 deg.C higher than that of objective coiling section, and its tail portion section temp. is 20-40 deg.C higher than objective coiling temp. Said invention can improve the performance uniformity of steel strip.

Description

Three section laminar flow cooling technology for hot rolling band steel
Technical field
The invention belongs to band steel cooling technology, relate in particular to three section laminar flow cooling technology for hot rolling band steel.
Background technology
In the hot-strip production process, in order further to improve the quality of products and to increase economic benefit, obtain the mechanical performance of the hot-strip of high-quality, hot-strip is after leaving last frame finishing mill, enter before the coiling machine, need cool off fast hot strip steel, with the coiling temperature of control band steel, this coiling temperature is that design temperature also is the target coiling temperature.It has been generally acknowledged that coiling temperature control is that the more little control accuracy of a fluctuation range is high more with design temperature, the control level is just good more.But also require on the whole length of band steel, to cool off evenly, to guarantee the mechanical performance uniformity of band steel.In fact, the band steel that adopts this type of cooling to produce, the same volume performance difference of steel band is big.This mainly is that temperature drop is big end to end, cooling is fast owing to steel band, and the coil of strip after especially steel band batches temperature drop, cooling velocity end to end is all big than steel band center temperature drop, and cooling velocity is fast.The cooling velocity of air cooling is for end to end about 20 ℃/h after the rolling, and the steel coil strip central part is about 15 ℃/h, adds to have also in the operation of rolling that cooling velocity is very fast relatively end to end, and temperature drop is big.According to metallurgical principles, the big phase deformed nucleus of the fast degree of supercooling of cooling velocity probability is many, the formation grain refinement.Cooling velocity is fast end to end after batching simultaneously, and rolling the dynamic recovery process in back does not have the steel band centre to carry out fully.The steel that contains microalloy element is in addition batching the back because the central part cooling velocity is slow, the obvious refinement of microalloy precipitate end to end, disperse.The difference of said process has influenced the grain size difference of being with steel, plays the refined crystalline strengthening effect; It is different that steel band dynamically recovers, the dislocation strengthening difference; Dispersion-strengthened action is played in the obvious refinement of microalloy precipitate, disperse.Cause thus steel band end to end intensity to be higher than about steel band central part intensity 40Mpa, and influence product quality.Aborning, if thin steel band head is on the low side relatively by the technological requirement chilling temperature,, can causes and batch difficulty and the steel-fastening accident takes place with regard to easy deformation; If thick gauge steel band head is on the low side relatively by the technological requirement chilling temperature, steel plate deformed drag value is just high, can spread out the steel accident because of the coiling machine scarce capacity.
Summary of the invention
The object of the present invention is to provide a kind of steel band that can effectively overcome the invar roll coil of strip temperature drop is big end to end, cooling is fast and produce with the big three section laminar flow cooling technology for hot rolling band steel of volume performance difference.
Three section laminar flow cooling technology for hot rolling band steel of the present invention is achieved in that this process using computer laminar flow cooling control, it is characterized in that the band steel is made as three sections to be cooled off, first section is the long head sections of 30m that is, second section is the interlude of band steel, the 3rd section is the long end segment of 20m that is, three sections chilling temperature is controlled at respectively: interlude equals the target coiling temperature, and head sections is greater than 20~50 ℃ of target coiling temperatures, and end segment is greater than 20~40 ℃ of target coiling temperatures.
After realizing three section laminar flow cooling technology for hot rolling band steel of the present invention, the performance uniformity of steel band can be improved significantly.Because the raising of chilling temperature has compensated the influence that cooling velocity is brought metallographic structure soon, about making original steel band with volume difference 40Mp, be reduced to 15~20Mpa, lowly bring hot-strip production approach the easy steel-fastening of specification, produce the difficult problem that thick specification is easily spread out steel thereby solved head temperature, satisfied the requirement of next procedure simultaneously owing to the improvement of steel band performance uniformity better.
Description of drawings
Accompanying drawing 1 is existing coiling temperature process for cooling figure.
Accompanying drawing 2 is three sections process for cooling figure of the present invention.
Accompanying drawing 3 is a controlling party block diagram of the present invention.
Accompanying drawing 4 is three sections cooling control program figure of the present invention.
The specific embodiment
By embodiment three section laminar flow cooling technology for hot rolling band steel of the present invention is further described with reference to the accompanying drawings.
Accompanying drawing 1 is existing coiling temperature process for cooling figure, and t is a temperature among the figure, and m is a length, and o is the target coiling temperature, and as can be seen from the figure, the coiling temperature type of cooling of existing band steel is that whole winding steel 1 front and back temperature is identical, all is on the target coiling temperature.Accompanying drawing 2 is three sections process for cooling figure of the present invention, is to be greater than 20~50 ℃ of interlude chilling temperatures (being the target coiling temperature) with the chilling temperature of 30 meters of steel 1 head sections with the difference of accompanying drawing 1, and the chilling temperature of end segment is greater than 20~40 ℃ of interludes.Head sections and end segment need increase how many main specifications according to band steel 1 of temperature, also are that its cross dimensions is determined, actual temp sees also table 1.Three section laminar flow cooling technology of the present invention has utilized existing computer laminar flow cooling control function, its control method as shown in Figure 3, being computer determines after three sections process for cooling according to the specification of band steel, determine the length of band steel 1 head sections, interlude and end segment again according to three sections process for cooling, and the laminar flow that calculates separately waters the water yield (also promptly opening the valve number), then the length of band steel 1 head sections, interlude and end segment with open the instruction of valve number and send to electrical equipment, again by electrical equipment by different length and temperature
Unit: ℃
Bandwidth mm position tape thickness mm ????850~1049 ????1050~1249 ????1250~1449 ????1450~1630
Head Afterbody Head Afterbody Head Afterbody Head Afterbody
????1.2~1.9 ????30 ????25 ????35 ????25 ????40 ????30 ????45 ????35
????2.0~3.9 ????25 ????25 ????30 ????25 ????35 ????25 ????40 ????30
????4.0~7.9 ????20 ????20 ????25 ????20 ????30 ????20 ????35 ????25
????8.0~11.9 ????25 ????20 ????30 ????20 ????35 ????25 ????40 ????30
????12.0~15.9 ????30 ????20 ????25 ????25 ????40 ????30 ????45 ????35
????16.0~19.0 ????30 ????25 ????40 ????30 ????45 ????35 ????50 ????40
Table 1, three section laminar flow cooling technology head sections and end segment coiling temperature control scheme table commander power-equipment open and close water valve, thereby realize three section laminar flow cooling technology for hot rolling band steel.
Embodiment 1:
The band steel that the embodiment of the invention 1 is produced 1.5 * 1250mm specification with the SS400 steel is an example, the target coiling temperature of band steel 1 is set at 650 ℃, can see that according to table 1 the desirable coiling temperature of its head sections should be greater than 35 ℃ of target coiling temperatures, also be 685 ℃, and the coiling temperature of its end segment should be 675 ℃.Computer is according to three sections cooling control programs (seeing also accompanying drawing 4), checks whether three sections coolings earlier; In this way, then determine three sections process for cooling systems (finding out the poor of head sections and end segment and target coiling temperature); Calculate three sections open valve number (the laminar flow valve number of head sections is 6, interlude is 9, end segment be 7), and determine length separately.Electrical equipment opens and closes valve according to the instruction directs power-equipment of computer by above-mentioned different valve number then, realizes three section laminar flow cooling technology.
Embodiment 2:
The band steel that the embodiment of the invention 2 is produced 16 * 1550mm specification with the Q345A steel is an example, the target coiling temperature of band steel 1 is made as 630 ℃, can see that according to table 1 the desirable coiling temperature of its head sections should also be 680 ℃ greater than 50 ℃ of target coiling temperatures, the coiling temperature of its end segment should be 670 ℃.Computer is according to three sections cooling control programs, and the laminar flow valve number that calculates band steel 1 head sections is 28, interlude is 36, end segment is 30.Count up to into the switching of valve by power-equipment by above-mentioned different valve at last, thereby realize three section laminar flow cooling technology for hot rolling band steel.

Claims (3)

1. three section laminar flow cooling technology for hot rolling band steel, adopt the computer laminar flow cooling control, it is characterized in that the band steel is made as three sections to be cooled off, first section is the long head sections of 30m that is, second section is the interlude of band steel, and the 3rd section is that length is the end segment of 20m, and three sections chilling temperature is controlled at respectively: interlude equals the target coiling temperature, head sections is greater than 20~50 ℃ of target coiling temperatures, and end segment is greater than 20~40 ℃ of target coiling temperatures.
2. three section laminar flow cooling technology for hot rolling band steel according to claim 1, it is characterized in that SS400 band steel at 1.5 * 1250mm specification, its three sections chilling temperatures should be controlled at respectively: interlude equals the target coiling temperature, head sections is greater than 35 ℃ of target coiling temperatures, and end segment is greater than 25 ℃ of target coiling temperatures.
3. three section laminar flow cooling technology for hot rolling band steel according to claim 1, it is characterized in that Q345A band steel at 16 * 1550mm specification, its three sections chilling temperatures should be controlled at respectively: interlude equals the target coiling temperature, head sections is greater than 50 ℃ of target coiling temperatures, and end segment is greater than 40 ℃ of target coiling temperatures.
CN 02132975 2002-09-19 2002-09-19 Three section laminar flow cooling technology for hot rolling band steel Expired - Fee Related CN1216700C (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN 02132975 CN1216700C (en) 2002-09-19 2002-09-19 Three section laminar flow cooling technology for hot rolling band steel

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CN1216700C CN1216700C (en) 2005-08-31

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006102835A1 (en) * 2005-03-28 2006-10-05 Angang Steel Company Limited A continuous casting and rolling method for medium plate
CN101610856B (en) * 2007-02-15 2011-09-07 西门子公司 Method for assisting at least partially manual control of a metal processing line
CN101745551B (en) * 2008-12-11 2011-11-23 宝山钢铁股份有限公司 Free cooling method of hot rolling band steel
CN101502849B (en) * 2009-03-19 2011-12-21 东北大学 Medium plate laminar cooling chain edge part shading device control method
CN101230413B (en) * 2007-01-26 2012-07-04 宝山钢铁股份有限公司 Heat processing technique for austenitic stainless steel hot-rolling coil with high carbon content
CN102581044A (en) * 2012-02-10 2012-07-18 山西太钢不锈钢股份有限公司 Special cooling method for ferritic stainless steel
CN102759935A (en) * 2011-04-25 2012-10-31 蔺桃 Novel cooling control method
CN102851474A (en) * 2012-09-12 2013-01-02 首钢总公司 Production method for improving strip steel through coil mechanical property uniformity
CN102962296A (en) * 2012-11-14 2013-03-13 河北省首钢迁安钢铁有限责任公司 Low-temperature coiling method for thick X120 pipeline steel hot rolled coils
CN103599950A (en) * 2013-11-29 2014-02-26 武汉钢铁(集团)公司 Accelerated cooling device and method for improving steel plate cooling uniformity
CN103878185A (en) * 2012-12-21 2014-06-25 宝山钢铁股份有限公司 Dynamic section cooling control method for hot rolling laminar cooling
CN104525589A (en) * 2014-12-18 2015-04-22 山东钢铁股份有限公司 Hot rolled strip steel laminar cooling side spraying control method
CN104801551A (en) * 2014-01-23 2015-07-29 宝山钢铁股份有限公司 Hot continuous rolling strip thick plate coiling temperature control method
CN104930328A (en) * 2015-07-08 2015-09-23 成都梦工厂网络信息有限公司 Humanized handle device of electronic mobile device
CN105817489A (en) * 2015-01-06 2016-08-03 上海梅山钢铁股份有限公司 Hot rolled strip thermal head and tail laminar cooling technology
CN108906885A (en) * 2018-05-23 2018-11-30 包头钢铁(集团)有限责任公司 The method of hot-strip
CN109702022A (en) * 2019-01-24 2019-05-03 湖南华菱涟钢薄板有限公司 A method of prevent medium and high carbon steel coils of hot-rolled steel from generating smooth contusion defect
CN110449465A (en) * 2019-07-04 2019-11-15 邯郸钢铁集团有限责任公司 A method of reducing high-hardenability cold rolling high-strength steel cold rolling side brisement band
CN110624953A (en) * 2019-09-30 2019-12-31 攀钢集团西昌钢钒有限公司 Method and device for processing X80 strip steel
CN110883090A (en) * 2019-10-31 2020-03-17 邯郸钢铁集团有限责任公司 Method for overcoming acid rolling edge crack defect of cold-rolled high-strength steel above 780MPa level
CN111451290A (en) * 2020-03-31 2020-07-28 鞍钢股份有限公司 Production method for preventing thin strip steel head from being folded
CN111702006A (en) * 2020-05-15 2020-09-25 山西太钢不锈钢股份有限公司 Rolling method for improving quality stability of steel plate coil

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006102835A1 (en) * 2005-03-28 2006-10-05 Angang Steel Company Limited A continuous casting and rolling method for medium plate
CN101230413B (en) * 2007-01-26 2012-07-04 宝山钢铁股份有限公司 Heat processing technique for austenitic stainless steel hot-rolling coil with high carbon content
CN101610856B (en) * 2007-02-15 2011-09-07 西门子公司 Method for assisting at least partially manual control of a metal processing line
CN101745551B (en) * 2008-12-11 2011-11-23 宝山钢铁股份有限公司 Free cooling method of hot rolling band steel
CN101502849B (en) * 2009-03-19 2011-12-21 东北大学 Medium plate laminar cooling chain edge part shading device control method
CN102759935A (en) * 2011-04-25 2012-10-31 蔺桃 Novel cooling control method
CN102581044A (en) * 2012-02-10 2012-07-18 山西太钢不锈钢股份有限公司 Special cooling method for ferritic stainless steel
CN102581044B (en) * 2012-02-10 2014-01-22 山西太钢不锈钢股份有限公司 Special cooling method for ferritic stainless steel
CN102851474A (en) * 2012-09-12 2013-01-02 首钢总公司 Production method for improving strip steel through coil mechanical property uniformity
CN102851474B (en) * 2012-09-12 2015-05-27 首钢总公司 Production method for improving strip steel through coil mechanical property uniformity
CN102962296A (en) * 2012-11-14 2013-03-13 河北省首钢迁安钢铁有限责任公司 Low-temperature coiling method for thick X120 pipeline steel hot rolled coils
CN103878185A (en) * 2012-12-21 2014-06-25 宝山钢铁股份有限公司 Dynamic section cooling control method for hot rolling laminar cooling
CN103599950A (en) * 2013-11-29 2014-02-26 武汉钢铁(集团)公司 Accelerated cooling device and method for improving steel plate cooling uniformity
CN104801551A (en) * 2014-01-23 2015-07-29 宝山钢铁股份有限公司 Hot continuous rolling strip thick plate coiling temperature control method
CN104525589A (en) * 2014-12-18 2015-04-22 山东钢铁股份有限公司 Hot rolled strip steel laminar cooling side spraying control method
CN105817489A (en) * 2015-01-06 2016-08-03 上海梅山钢铁股份有限公司 Hot rolled strip thermal head and tail laminar cooling technology
CN105817489B (en) * 2015-01-06 2017-11-17 上海梅山钢铁股份有限公司 A kind of TEMPERATURE FOR HOT STRIP LAMINAR cooling technique
CN104930328A (en) * 2015-07-08 2015-09-23 成都梦工厂网络信息有限公司 Humanized handle device of electronic mobile device
CN108906885A (en) * 2018-05-23 2018-11-30 包头钢铁(集团)有限责任公司 The method of hot-strip
CN109702022A (en) * 2019-01-24 2019-05-03 湖南华菱涟钢薄板有限公司 A method of prevent medium and high carbon steel coils of hot-rolled steel from generating smooth contusion defect
CN110449465A (en) * 2019-07-04 2019-11-15 邯郸钢铁集团有限责任公司 A method of reducing high-hardenability cold rolling high-strength steel cold rolling side brisement band
CN110449465B (en) * 2019-07-04 2021-03-09 邯郸钢铁集团有限责任公司 Method for reducing cold-rolled edge fracture zone of high-hardenability cold-rolled high-strength steel
CN110624953A (en) * 2019-09-30 2019-12-31 攀钢集团西昌钢钒有限公司 Method and device for processing X80 strip steel
CN110883090A (en) * 2019-10-31 2020-03-17 邯郸钢铁集团有限责任公司 Method for overcoming acid rolling edge crack defect of cold-rolled high-strength steel above 780MPa level
CN110883090B (en) * 2019-10-31 2021-11-05 邯郸钢铁集团有限责任公司 Method for overcoming acid rolling edge crack defect of cold-rolled high-strength steel above 780MPa level
CN111451290A (en) * 2020-03-31 2020-07-28 鞍钢股份有限公司 Production method for preventing thin strip steel head from being folded
CN111702006A (en) * 2020-05-15 2020-09-25 山西太钢不锈钢股份有限公司 Rolling method for improving quality stability of steel plate coil

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