CN101362147B - Rolling and cooling controlled hot-rolling test rolling mill - Google Patents
Rolling and cooling controlled hot-rolling test rolling mill Download PDFInfo
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- CN101362147B CN101362147B CN2008101969981A CN200810196998A CN101362147B CN 101362147 B CN101362147 B CN 101362147B CN 2008101969981 A CN2008101969981 A CN 2008101969981A CN 200810196998 A CN200810196998 A CN 200810196998A CN 101362147 B CN101362147 B CN 101362147B
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Abstract
A thermo-mechanical control processing hot rolling testing mill comprises a mill furnance (1), a home roll mill and a hydraulic jet descaler (2), a rough roller mill (3), a roll table (13), and a finishing mill (8); a heat holding cover(4) which is provided with electromagnetic induction heaters (5) with intervals is arranged above a first section of the roll table (13); a channel (14) provided for billet steel to move is formed among the heat holding cover (4), the electromagnetic induction heaters (5) and the roll table (13); a second section of the roll table (13) behind the finishing mill (8) is provided with a three-section type cooling device and a coiler (12) is arranged behind the three-section type cooling device. The mill overcomes the shortcomings of the prior hot rolling mills that the function is single; and the heat treatment to steel plates can only adopt an off-line method, etc. The mill is suitable for both medium plates and hot rolling strip steel products and realizes the technological tests of new TMCP (thermo-mechanical control processing), which can obviously shorten the development cycle of new products and lower the developing cost and has important practical application value.
Description
Technical field
The invention belongs to hot rolling test milling train, it is a kind of rolling and cooling controlled hot-rolling test rolling mill particularly.It integrate roll preceding heating, rolling, cool off, roll functions such as after-baking, aligning.
Background technology
The pilot scale task that the new product, new technology, new technology, new equipment of iron and steel enterprise are developed is being born in the pilot scale base, and it is the important step that science and technology is converted into productivity.Doing the pilot scale construction of base well can shorten the research and development cycle, reduce the research and development cost, help simultaneously to new product, new technology, new technology, new equipment carry out repeatedly, go deep into, careful research, make it be converted into productivity as soon as possible, to realizing that " use a generation, promote a generation, study a generation, plan a generation " research and development guiding theory has great significance, this makes iron and steel enterprise pay attention to the construction in pilot scale base further, and main iron and steel enterprise both domestic and external all has smelting-rolling simulation production line basically.For example there be smelting+600mm two-roller reversible formula hot rolling test milling train one cover and corresponding EXPERIMENTAL COLD ROLLING MILL TYPE group in Thyssen company, steel has smelting+500mm two-roller reversible formula hot rolling test milling train one cover and corresponding EXPERIMENTAL COLD ROLLING MILL TYPE group in the Taiwan, and the Nippon Steel of Japan and the Posco of Korea S etc. also all have similar pilot scale simulation production line.
Comparatively speaking, the pilot plant of domestic iron and steel enterprises equipment and technology controlling and process level are low relatively, but domestic especially big iron and steel enterprise such as Wuhan Iron and Steel Plant, Baosteel begins to drop into huge fund construction pilot scale base in recent years.Smelt district's equipment and relate to numerous external refining equipments such as ladle refining furnace, there is the hot-rolling mill of two roller hot-rolling mills or two rollers and four roller combining forms in the steel rolling district, and follow-up cold-rolling mill mostly is four rollers, six rollers or four, the interchangeable single chassis reversable mill of six rollers.
Take a broad view of the existing equipment of hot rolling in domestic and international advanced iron and steel enterprise pilot scale base, design fairly simplely mostly, process thought rests on the original level of " striking while the iron is hot " mostly, follow-up cooling control technology window ranges is narrow, the adjustment space is limited, makes that TMCP of new generation (controlled rolling and controlled cooling) technology is embodied on the trial ginning machine in these fully.Relatively simply the controlling cooling device and can't realize TMCP of new generation technique center thought of trial ginning machine in the existing hot rolling hindered the research and the application in the big production of reality thereof of new product development work and new process to a certain extent.
In addition, existing hot-rolling mill function ratio is more single, consider that kind, specification are limited, most kind and specifications of considering just to be limited to slab or middle plate, roll thin steel plate, can only rely on the increase rolling pass, but decrease of temperature has limited the increase of road number of times, total reason is: the ability of 1. testing the milling train design can not be too big; 2. testing does not have to mend fast the equipment of temperature and soaking on the line of rolling apparatus.
Simultaneously, after the modern pilot scale hot-rolling mill on-line rolling, can only take the mode of off-line to the heat treatment of steel plate, the temperature suppression ratio is bigger, drop to normal temperature substantially after, enter heat-treatment furnace again and handle, have more differently with the situation of actual production, and expend the energy and time.
In sum, development and Design goes out to realize TMCP of new generation (controlled rolling and controlled cooling) engineer testing, can mend warm soaking fast to the rolled piece in the operation of rolling again, thereby it is rolling than sheet metal, can also carry out online heat treatment test to rolling the back steel plate simultaneously, comprise normalizing, tempering, quenching, can align the pilot scale hot rolling production line of test to the steel plate after the heat treatment at last, such production line really embodies the technical characterstic of one-machine-multi-function, has important application value.
Summary of the invention
The objective of the invention is to overcome above-mentioned existing disadvantages of background technology part, and a kind of rolling and cooling controlled hot-rolling test rolling mill is provided.
The objective of the invention is to reach: rolling and cooling controlled hot-rolling test rolling mill by following measure, it comprises heating furnace 1, first edger and high-pressure water descaling machine 2, thick roller machine 3, roller-way 13, finishing mill 8, coiling machine 12, roller-way 13 is divided into two sections, first section roller-way is between thick roller machine 3 and finishing mill 8, second section roller-way is between finishing mill 8 and coiling machine 12, it is characterized in that above first section roller-way 13, being furnished with stay-warm case 4, be furnished with electromagnetic induction heater 5 on the stay-warm case 4 at interval, stay-warm case 4, form a passage 14 that can supply steel billet to move between electromagnetic induction heater 5 and the roller-way 13, electromagnetic induction heater 5 is arranged between two adjacent roller-ways 13, being furnished with the syllogic cooling device on second section roller-way 13 behind the finishing mill 8, is coiling machine 12 behind the syllogic cooling device.
In technique scheme, between first section roller-way 13 and finishing mill 8, be furnished with quenching press 6, straightener 7 successively.
In technique scheme, described syllogic cooling device comprises ultrafast cooling section 9 successively, laminar flow cooling section 10 and fast cold section 11, wherein the length of ultrafast cooling section is 10m-15m, for thick rolled piece cooling capacity≤450 of 4mm ℃/s, the length of pipe laminar flow cooling section is 20m-65m, cooling capacity≤70 ℃/s, fast cold section length is 20m-35m, cooling capacity≤200 ℃/s.
In technique scheme, be that electromagnetic induction heater 5 is the adjustable power formula, the group number is less than 15 groups, and single group power is less than 250KW, and every group of electromagnetic induction heater 5 is furnished with the inflated with nitrogen device.
In technique scheme, be that thick roller machine 3 is two-roller reversible milling train, roll roll surface width≤2000mm, working roll roller footpath 〉=600mm, but roller supplied materials thickness≤300mm, width≤1800mm, weight≤5000Kg.
In technique scheme, between straightener 7 and finishing mill 8, also have second edger and high-pressure water descaling machine 15.
In technique scheme, the spacing 〉=500mm between the adjacent roller-way 13.
In technique scheme, finishing mill 8 or be single chassis, or be two-shipper frame four roll reversing rollers, or be the tandem rolling unit of 4-5 frame, roll roll surface width≤2000mm.
The Action Specification that equipment is installed in the rolling and cooling controlled hot-rolling test rolling mill of the present invention:
1., before finishing mill, dispose the whole electromagnetic induction heater (inductor) of many group adjustable power, blank can be done to swing back and forth along the rolling line direction in the electromagnetic induction heater group and move, play the effect of concurrent heating intensification and soaking, make that entering the preceding blank temperature of finish rolling has bigger adjustment space, thereby reach the purpose of rolling more thin specification steel plate, inductor group number is less than 15 groups, single group power is less than 250Kw, and single group actual power can be adjusted, the coil groups number of devoting oneself to work according to the thickness decision of the requirement of firing rate and steel plate.For preventing billet oxidization in the heating process, inflated with nitrogen is protected in every group of heater, every group of nitrogen flow rated value≤60m
3/ h.
2., because roller-way is a metal material, for avoiding it to be subjected to the influence of induced field, inductor coil is contained between the adjacent roller-way, the adjacent roller track pitch is answered 〉=500mm, for the temperature that reduces to swing in the heating process descends, before and after induction heater and between the adjacent inductor, stay-warm case is installed simultaneously.
3., roughing mill is the two-roller reversible milling train, roll roll surface width≤2000mm, working roll roller footpath 〉=600mm, the supplied materials maximum ga(u)ge≤300mm that can roll, Breadth Maximum≤1800mm, maximum weight≤5000Kg.
4., the finishing mill pattern can be single chassis or two-shipper frame four roll reversing rollers, it perhaps is the tandem rolling unit of 4～5 frames, wherein F1, F2 are duo mill, F3～F4 (F5) is the replaceable milling trains of two/four rollers, roll roll surface width≤2000mm, F1, F2, F3, F4 (F5) are that the order of milling train is placed number, represent first milling train as F1, and F2 represents second milling train.
5., more than 12mm and to rolled piece, do not require rolling when finished product thickness, only at the roughing mill reversible rolling, if temperature drop is excessive, middle blank can suitably be mended temperature in electromagnetic induction heater, it is rolling to continue to finish distortion at roughing mill then, roll after the target thickness, the empty finishing mill of crossing of blank runs to cooled region and rolls the back cooling.
6., cool off the steel plate that finishes, heat-treat test if desired, steel plate can be reverse in rolling direction, the empty finishing mill of crossing runs in the electromagnetic induction heater, do forward and the reverse motion that swings back and forth therein, carry out normalizing, high tempering or lonneal and handle, coil groups number of devoting oneself to work and inductor power are determined according to the thickness of temperature, firing rate and the steel plate of needs heating.
7., press quenching machine and multi-roll straightening machine are installed behind electromagnetic induction heater, can finish test of the press quenching of all thickness steel plate and follow-up plate shape aligning test.
8., when finished product thickness has into rollback request below 12mm and to rolled piece, blank carries out the reversible rolling of 1～7 passage at roughing mill, at this moment intermediate blank thickness is between 25～40mm, if temperature drop is excessive, it is middle that blank can (it be fast to have firing rate at electromagnetic induction heater, the advantage that heating uniformity is good) suitably mend temperature in, entering finishing mill then, to finish distortion rolling, runs to cooled region afterwards and roll the back cooling.
9., after finishing mill, adopt the after-rolling cooling system of syllogic, dispose the cooling section of the different intensities of cooling of many groups, be respectively ultrafast cooling section, laminar flow cooling section, fast cold section, wherein the length of ultrafast cooling section is 10m-15m, maximum one can reach 450 ℃/s (for the thick rolled piece of 4mm), and the length of pipe laminar flow cooling section is 20m-65m, and maximum one is 70 ℃/s, fast cold section length is 20m-35m, and maximum one is about 200 ℃/s.Rolled piece can experience various cooling route after rolling, it is big that the space is adjusted in cooling, and the cooling procedure of rolled piece can be effectively controlled.The experiment proved that: this syllogic cooling device can satisfy the specification requirement (as shown in Figure 3) of TMCP of new generation (controlled rolling and controlled cooling) fully.
10., rolled piece that rollback request arranged into after cooling, enter coiling machine and batch rolling.Sheet metal after the rolling can be positioned over plate in the electromagnetic induction heater after being cut into plate on other traverse, is similar to the above slab of 12mm, carries out corresponding heat treatment test, as normalizing, temper, and press quenching and aligning test.
Rolling and cooling controlled hot-rolling test rolling mill of the present invention has following advantage: take into account cut deal and hot-strip product, can realize TMCP of new generation (controlled rolling and controlled cooling) engineer testing, can mend warm soaking fast to the rolled piece in the operation of rolling again, thereby it is rolling than sheet metal, can also carry out online heat treatment test to rolling the back steel plate simultaneously, comprise normalizing, tempering, quenching, can carry out straightening processing to the steel plate after the heat treatment at last.Such production line really embodies the technical characterstic of one-machine-multi-function, can obviously shorten the construction cycle of new trial product, reduces development cost, has important application value.
Description of drawings
Fig. 1 is the structural representation (direction among the figure shown in the arrow is steel billet swing or moving direction) of rolling and cooling controlled hot-rolling test rolling mill of the present invention.
Fig. 2 for induction heater coils of the present invention around to schematic diagram (direction among the figure shown in the arrow is a coil winding-direction).
(a represents the distortion under the normal temperature to Fig. 3 among the figure at the cooling chart of syllogic cooling device for steel plate, b represents quick cooling, and c represents the dynamic phase trasnsition point, and d represents cooling path control, e represents the CCT curve), i.e. TMCP (controlled rolling and controlled cooling) technological thought curve map.
1. heating furnaces among the figure, 2. first vertical miller and high-pressure water descaling machine (act as the wide and centering of control, remove iron scale), 3. roughing mill, 4. stay-warm case, 5. electromagnetic induction heater (inductor), 6. quenching press, 7. straightener, 8. finishing mill, 9. ultrafast cooling section, 10. laminar flow cooling section, 11. fast cold section, 12. coiling machines, 13. roller-way, 14. passages, 15. second edgers and high-pressure water descaling machine (act as the wide and centering of control, remove iron scale), 16. coils, 17. steel billets.
The specific embodiment
Describe performance of the present invention in detail below in conjunction with accompanying drawing, but they do not constitute limitation of the invention, only do for example.Simultaneously by illustrating that advantage of the present invention will become clear more and understanding easily.
Consult accompanying drawing as can be known: rolling and cooling controlled hot-rolling test rolling mill of the present invention, it comprises heating furnace 1, first edger and high-pressure water descaling machine 2, thick roller machine 3, roller-way 13, finishing mill 8, first section roller-way 13 is between thick roller machine 3 and finishing mill 8, above second section roller-way 13, be furnished with stay-warm case 4, stay-warm case 4, form a passage 14 that can supply steel billet to move between electromagnetic induction heater 5 and the roller-way 13, electromagnetic induction heater 5 is arranged between two adjacent roller-ways 13, passage 14 passes electromagnetic induction heater 5, between roller-way 13 and the finishing mill 8 quenching press 6 is arranged successively, straightener 7, finishing mill 8 backs are furnished with the syllogic cooling device on roller-way 13, be coiling machine 12 behind the syllogic cooling device; Electromagnetic induction heater 5 is the adjustable power formula, and the group number is less than 15 groups, and single group power is less than 250KW, and every group of electromagnetic induction heater 5 has the inflated with nitrogen device, nitrogen flow value≤60m
3/ h; Adjacent roller-way 13 spacings 〉=500mm are the two-roller reversible milling train at thick roller machine 3, roll roll surface width≤2000mm, working roll roller footpath 〉=600mm, but roller supplied materials thickness≤300mm, width≤1800mm, weight≤5000Kg; Finishing mill 8 is single chassis or two-shipper frame four roll reversing rollers, or is the tandem rolling unit of 4-5 frame, roll roll surface width≤2000mm; Second edger and high-pressure water descaling machine 15 (as shown in Figure 1) are arranged between straightener 7 and finishing mill 8; Induction heater coils around to being the helix form, its axis consistent with the length direction of slab (as shown in Figure 2).
1., between the austenitic area consult Fig. 3 as can be known: TMCP of new generation technique center thought is,, when it is hot, finishes continuous large deformation and strain accumulation in the temperature range that is suitable for being out of shape, the austenite that obtains hardening; 2., carry out after rolling ultrafast coldly immediately, make rolled piece rapidly by the austenite phase region, keep rolled piece austenite hardening state; 3., stop cooling at austenite to the dynamic phase trasnsition point of ferrite transformation; 4., the follow-up control of carrying out cooling path according to the needs of material structure and performance.
The syllogic cooling device comprises ultrafast cooling section 9 successively, laminar flow cooling section 10 and fast cold section 11, wherein the length of ultrafast cooling section is 10m-15m, for thick rolled piece cooling capacity≤450 of 4mm ℃/s, the length of pipe laminar flow cooling section is 20m-65m, cooling capacity≤70 ℃/s, fast cold section length is 20m-35m, cooling capacity≤200 ℃/s (as shown in Figure 3).
The experiment proved that electromagnetic induction heater of the present invention and syllogic cooling device can satisfy TMCP (controlled rolling and controlled cooling) specification requirement fully
The present invention is to thickness≤300mm, width≤2000mm, the steel billet of weight≤5000Kg heats, rolling, mend operations such as temperature, cooling, cold after-baking, aligning and process, be the hot rolling test unit of a combination function, for hot rolling TMCP technology is used and new product development provides good test platform.
During work, steel billet is heated to 1150 ℃～1230 ℃ in heating furnace, the back steel billet of coming out of the stove moves to vertical miller and high-pressure water descaling machine place on roller-way, carrying out edging and de-scaling handles, run to two roller roughing mills then, when the steel plate that requires to be rolled into more than the 12mm, steel billet only carries out reversible rolling at roughing mill, if temperature drop is excessive in the operation of rolling, steel billet can suitably be mended temperature in electromagnetic induction heater, make steel billet internal and external temperature homogenising, it is rolling to continue to finish distortion at roughing mill then, after rolling target thickness, the empty finishing mill of crossing of steel billet runs to cooled region and rolls the back cooling.
If desired cold back steel plate is heat-treated, steel plate can be reverse in rolling direction, the empty finishing mill of crossing runs in the electromagnetic induction heater, do forward and the reverse motion that swings back and forth therein, carrying out normalizing, high tempering or lonneal handles, coil groups number of devoting oneself to work and inductor power are determined according to the thickness of temperature, firing rate and the steel plate of needs heating, following table 1 has illustrated steel billet thickness and the relation between heat time heating time, the width of steel billet is 2000mm during calculating, and length is 6000mm.
Table 1 mode of heating and parameter list
Simultaneously can carry out Quenching Treatment to steel plate, steel plate is heated to hardening heat 920-950 ℃ in induction heater, run to the quenching apparatus place then and carry out Quenching Treatment, the straightener that then enters 7 rollers or 9 rollers is aligned, and has at this moment just finished rolling processing, cooling, the heat treatment of steel plate, the technical process of aligning.
When steel plate is had into rollback request, steel billet carries out the reversible rolling of 1～7 passage at roughing mill, at this moment intermediate blank thickness is between 25～40mm, utilize temperature measurer to the billet surface thermometric, if temperature drop is excessive, steel billet can be moved in the electromagnetic induction heater and suitably to mend temperature, entering finishing mill then, to finish distortion rolling, runs to afterwards to cool off after cooled region rolls and batch.Described in technical scheme, adopt the after-rolling cooling system of syllogic after the finishing mill, steel plate is at the cooling curve that makes up cooling section as shown in Figure 3.
For the steel band of rolling, can after be cut into plate on other traverses, utilize and carry out corresponding heat treatment test in the electric induction heater, as normalizing, temper, and press quenching and aligning test.
Claims (7)
1. rolling and cooling controlled hot-rolling test rolling mill, it comprises heating furnace (1), first edger and high-pressure water descaling machine (2), thick roller machine (3), roller-way (13), finishing mill (8), coiling machine (12), roller-way (13) is divided into two sections, first section roller-way is positioned between thick roller machine (3) and the finishing mill (8), second section roller-way is positioned between finishing mill (8) and the coiling machine (12), it is characterized in that being furnished with stay-warm case (4) in the top of first section roller-way (13), stay-warm case (4) is gone up and is furnished with electromagnetic induction heater (5) at interval, stay-warm case (4), form a passage (14) that can supply steel billet to move between electromagnetic induction heater (5) and the roller-way (13), there is electromagnetic induction heater (5) to be positioned between two adjacent roller-ways (13), being furnished with the syllogic cooling device on the second section roller-way (13) behind the finishing mill (8), is coiling machine (12) behind the syllogic cooling device; Described syllogic cooling device comprises ultrafast cooling section (9) successively, laminar flow cooling section (10) and fast cold section (11), wherein the length of ultrafast cooling section is 10m-15m, for thick rolled piece cooling capacity≤450 of 4mm ℃/s, the length of pipe laminar flow cooling section is 20m-65m, cooling capacity≤70 ℃/s, fast cold section length is 20m-35m, cooling capacity≤200 ℃/s.
2. rolling and cooling controlled hot-rolling test rolling mill according to claim 1 is characterized in that being furnished with successively quenching press (6), straightener (7) between first section roller-way (13) and finishing mill (8).
3. rolling and cooling controlled hot-rolling test rolling mill according to claim 1 is characterized in that electromagnetic induction heater (5) is the adjustable power formula, and the group number is less than 15 groups, and single group power is less than 250KW, and every group of electromagnetic induction heater (5) is furnished with the inflated with nitrogen device.
4. rolling and cooling controlled hot-rolling test rolling mill according to claim 1 is characterized in that thick roller machine (3) is the two-roller reversible milling train, roll roll surface width≤2000mm, working roll roller footpath 〉=600mm, but roller supplied materials thickness≤300mm, width≤1800mm, weight≤5000Kg.
5. rolling and cooling controlled hot-rolling test rolling mill according to claim 2 is characterized in that also having second edger and high-pressure water descaling machine (15) between straightener (7) and finishing mill (8).
6. rolling and cooling controlled hot-rolling test rolling mill according to claim 1 and 2 is characterized in that the spacing 〉=500mm between the adjacent roller-way (13).
7. rolling and cooling controlled hot-rolling test rolling mill according to claim 1 and 2 is characterized in that finishing mill (8) or is single chassis, or be two-shipper frame four roll reversing rollers, or be the tandem rolling unit of 4-5 frame, roll roll surface width≤2000mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101969981A CN101362147B (en) | 2008-09-12 | 2008-09-12 | Rolling and cooling controlled hot-rolling test rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101969981A CN101362147B (en) | 2008-09-12 | 2008-09-12 | Rolling and cooling controlled hot-rolling test rolling mill |
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| CN101362147B true CN101362147B (en) | 2010-09-01 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101745537B (en) * | 2010-01-11 | 2013-05-29 | 中冶东方工程技术有限公司 | Method for producing seamless steel tube with heat preservation cover of pilger mill |
| CN102513384B (en) * | 2011-12-09 | 2015-03-11 | 东北大学 | Method for cooling intermediate billet of medium-thickness plate by using equipment for cooling after rolling |
| CN106222372B (en) * | 2016-08-30 | 2018-10-02 | 南京钢铁股份有限公司 | A kind of slab press quenching method based on inclination injection stream |
| CN106643135B (en) * | 2016-12-26 | 2019-02-19 | 中国重型机械研究院股份公司 | It is a kind of to roll the warm system of middle benefit with what duration heated for batch rolled piece isothermal |
| CN109201756A (en) * | 2018-09-25 | 2019-01-15 | 芜湖新兴铸管有限责任公司 | The controlled rolling and controlled cooling method of 30MnSi rod iron for building |
| CN111822527B (en) * | 2020-08-26 | 2022-03-01 | 武汉钢铁有限公司 | Experimental device and method for simulating cooling process after hot rolling |
| CN113414239A (en) * | 2021-06-23 | 2021-09-21 | 上海大学 | High-flux rolling heat treatment machine |
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