CN103599946B - Thin Specs stainless steel product operation of rolling control method - Google Patents
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Abstract
The invention discloses a kind of Thin Specs stainless steel product operation of rolling control method, belong to the Thin Specs hot-rolled stainless product made from steel operation of rolling control method of field of metallurgy, comprise: temperature controls: heating furnace two adds temperature and controls at 1230 ± 20 DEG C, this section of minimum time 40min of temperature, soaking zone temperature controls at 1270 ± 20 DEG C, this section of minimum time 35min of temperature; Speeds control: roughing the 5th passes speeds control is at 4.5m/s, and finishing speeds controls at more than 9m/s; Rolling procedure controls.The present invention is a kind of course control method for use being applicable to Thin Specs stainless steel product, to ensure that Thin Specs stainless steel product can be stablized and bulk production in the operation of rolling, reduces time of casualty; Guarantee Thin Specs is quality controlled, comprises dimensional tolerance, template, and strip surface quality.
Description
Technical field
The invention belongs to the Thin Specs hot-rolled stainless product made from steel operation of rolling control method of field of metallurgy.
Background technology
At present, China has become the first in the world Chan Gang big country, and hot-strip kind occupies extremely important status in China's steel and iron industry, and domestic each big steel company is in order to capture Strip market as early as possible, numerous and confused cost huge fund is newly-built or transform thin plate Continuous Rolling Mill, constantly expands variety range and output.Along with the development of hot-strip technology and the aggravation of market competition, exploitation Thin Specs hot-strip, realizes the development trend that " with hot Dai Leng " becomes current steel market.
Part replaces cold-strip steel, i.e. " with hot Dai Leng "; Use Thin Specs hot-strip to do cold rolling feeds, construction cost that is cold rolling and annealing operation can be reduced, greatly reducing the construction costs, shorten the production cycle; Adopt Thin Specs to do cold rolling feeds and can reduce cold rolling passage, save energy consumption, thus reduce production cost; Due to specification price difference, produce Thin Specs and the profit of band steel per ton can be made to increase, virtually enhance the competitiveness of enterprise, therefore become the necessity of market competition by analyzing and grasp stainless steel hot-rolling thin plate production and processing technology.
But in general, China's SPHC is produced, design level still has certain gap compared with advanced international standard, also needs continuous understanding, grasp new technology, the new technology of SPHC production, promotes the quality of hot rolled strip product.
Because the template of Thin Specs strip is restive, there is larger difficulty in actual production, cause that operating rate is low, accident rate is high, lumber recovery is low, cause model cootrol precision in process control low, Model Self-Learning parameter is unreasonable.
Summary of the invention
The object of the invention is to: a kind of course control method for use being applicable to Thin Specs stainless steel product is provided, to ensure that Thin Specs stainless steel product can be stablized and bulk production in the operation of rolling, reduce time of casualty; Guarantee Thin Specs is quality controlled, comprises dimensional tolerance, template, and strip surface quality.
The applicant in the research of Thin Specs stainless steel product operation of rolling control method, transformation mm finishing mill unit, increase to 7 frames by 6 frames, specification expands to 2.5mm from original 3.0mm, finds under study for action:
1. temperature aspect impact:
In hot rolling thin strip is produced, the impact of temperature on the operation of rolling is the most key.Product specification is thinner, and the temperature drop of band steel in the operation of rolling is also larger, can cause head and tail temperature difference like this, thus the template of influence zone steel, dimensional accuracy and structure property.Simultaneous temperature is lower, and the rolling load of milling train is also larger, also larger to the impact of equipment during threading, is easy to cause damage to equipment.
2. the impact of speed aspect:
Because Thin Strip Steel rolldown speed is very fast, control adjustment difficulty during threading comparatively large, if adjustment not in time, be easy to heap steel accident occurs, threading accident probability can be increased like this.Simultaneously because speed is fast, easily cause whipping, influence zone steel Quality of Tail when throwing steel, also can cause damage on breaker roll surface, affect service life and the roll change cycle of roll.
3. the impact of mill load:
Because mill load during Thin Strip Steel rolling is larger, if sharing of load is uneven, precision, the quality of the stable and finished product of direct influence of rolled, also may cause heap steel, the accidents such as roll breakage, coiling machine driving, cause damage to plant equipment.
4. on the impact of strip quality:
Roll coil of strip quality more difficult control during Thin Strip Steel rolling.Except easily producing rotten limit, rotten tail during rolling, roll brokenly, except template harmful effect roll coil of strip quality, Dutch roll when band steel runs on rollgang, foldingly also can cause the problems such as roll coil of strip turriform, loose winding, thus affect the quality of the roll coil of strip.
Thus, the object of the invention is realized by following technical proposals:
A kind of Thin Specs stainless steel product operation of rolling control method, comprising:
1) temperature controls: heating furnace two adds temperature and controls at 1230 ± 20 DEG C, this section of minimum time 40min(minute of temperature), soaking zone temperature controls at 1270 ± 20 DEG C, this section of minimum time 35min of temperature;
2) speeds control: roughing the 5th passes speeds control is at 4.5m/s(metre per second (m/s)), finishing speeds controls at more than 9m/s;
3) rolling procedure controls:
Roughing rolling procedure controls: each passage spatial load forecasting is 27%, 28%, 30%, 31%, 30%, and passage de-scaling controls to be 1 time, and workpiece thickness controls at 28 ± 1mm(millimeter);
Finish rolling rolling procedure controls: each frame spatial load forecasting is, F1:40%, F2:40%, F3:38%, F4:32%, F5:36%, F6:20%, F7:6-9%.F1 ~ F7 represents finishing stand 1 ~ finishing stand 7.
In such scheme, the prior art relatively before transformation, during temperature controls, heating furnace two adds temperature and rises to 1230 DEG C by 1190 DEG C, soaking zone temperature improves 20-30 degree again on the basis of former thermal thermal temperature, increases each section of minimum time range restriction of temperature, can prevent low-temperature steel from coming out of the stove; Speeds control center, roughing the 5th passes speed is mentioned 4.5m/s from 4.2m/s, shorten rolling time about 5 seconds: when speed is 4.2m/s: RDT observed temperature: 1102.48, the intermediate blank transmission time: 65s, intermediate blank temperature calculations: 1031.48, FET observed temperature: 1011.06, intermediate blank transmission time: 48s, intermediate blank temperature calculations: 1003.5.When speed is 4.5m/s: RDT observed temperature: 1109.65, intermediate blank transmission time: 61s, intermediate blank temperature calculations: 1043.30, FET observed temperature: 1013.34, intermediate blank transmission time: 48s, intermediate blank temperature calculations: 1005.75; Finishing speeds is brought up to more than 9 meters from maximum 8 meters simultaneously, will reduce temperature drop 10-20 degree, fast FDT is higher for speed; During rolling procedure controls, for roughing rolling procedure, load is optimized: by the sharing of load of front passage to rear a few passage, by 28%, and 30%, 32,29%, 28% becomes 27%, 28%, 30%, 31%, 30%; Reduce passage de-scaling: change 1 de-scaling into by 2 de-scalings; Optimize workpiece thickness: according to rolling integrative feedback, test 25-32 mm workpiece thickness is on the impact of rolling, and final selected 28mm is optimised process reference point; Finish rolling rolling schedule optimization: produce Thin Specs band, each frame reduction ratio significantly improves, arrangement and the traditional handicraft of its rolling schedule are different, for this reason, distribute needs be optimized the pressure of frame, distribute by optimizing pressure, reduced by the load of afer bay, prevent Thin Specs from rolling rotten, concrete load range controls at about 6-9%, little pressure can make production board shape, glacing flatness is easy to control, and reduces heap steel accident.Mm finishing mill unit rear frame reduction ratio is excessive, will control to cause larger difficulty to strip profile and flatness.Utilize the roller footpath of F1, F2 frame comparatively large, there is not the problem of nipping, rolled piece is in high temperature again, should apply comparatively heavy reduction, to reduce the pressure load of frame below, completes target Crown control simultaneously.
As selection, described rolling procedure controls also to comprise loop tension between each frame and controls to pause at L1:6t(), L2:5t, L3:5t, L4:4.5t, L5:4t, L6:3.5t.L1 represents the loop tension between F1 and F2, and L2 represents the loop tension between F2 and F3, and the rest may be inferred.
In such scheme, during loop tension controls, suitably strengthen loop tension, particularly thick Rack Unit tension force between each frame, average increase by 5 unit scalars, thus make rolling more stable.
As selection, described rolling procedure controls also to comprise afterbody and compensates: namely when Fi-2 frame throws steel, Fi and Fi-1 frame is depressed simultaneously, and i is 3,4,5,6 or 7.
In such scheme, traditional pressure tail is all when tail part of band steel leaves Fi-1 frame, strengthens the drafts of Fi frame, loses thick the jumping of opening with temperature drop generation to compensate tail part of band steel; Or the mode of " drawing tail " of employing, when namely tail part of band steel leaves Fi frame, reduces the speed of Fi+1 frame, make Fi+1 and Fi+2 interstand tension strengthen, affect one with what compensate the disappearance of Fi and Fi+1 interstand tension.Make discovery from observation, if only regulate the pressure of Fi frame when Fi-1 frame throws steel, control effects is not fine, tail part of band steel quality still can not get good improvement, therefore have employed the method that tail pressed by two framves simultaneously, namely when Fi-2 frame throws steel, Fi and Fi-1 frame is depressed simultaneously.
As selection, described rolling procedure controls also to comprise rolling scaduled control: the plan carrying out non-hopping from thick to thin, transition thickness 0.2 ± 0.15mm.Further, through 1-3 block 3.0mm(thickness of slab) Direct Rolling 2.5-2.85mm specification slab after slab rolling.Further, in 28 pieces of slab rollings, rolling scaduled control is followed successively by 3.0mm slab rolling three pieces, 2.85mm slab rolling two pieces, 2.5mm slab rolling ten pieces, 2.85mm slab rolling six pieces, 3.0mm slab rolling six pieces, 4.0mm slab rolling one piece.
In such scheme, rolling scaduled layout can make on-the-spot rolling stablize, and ensures the energy rolling smoothly when rolling Thin Specs; Rolling scaduled layout is proper, can also improve strip steel head thickness hit rate.Direct Rolling Thin Specs after 1-3 block 3.0, rolling is stablized, and thickness is easy to control.
As selection, adopt hot-rolling lubricating technology, be specially: come into operation F2-F5 frame, oil mass is 50 milligrams, delays oil spout in 1 second, throws steel first 1 second pass oil when sequential is threading.
In such scheme, for the rolling Thin Specs torrid zone, hot-rolling lubricating technology has important function, it can reduce roll-force, reduces roll loss, improve surface quality, come into operation F2-F5, and oil mass is 50 milligrams, delays oil spout in 1 second, throws steel first 1 second pass oil when sequential is threading, roll-force can lower about 15%, is convenient to the Thin Specs of rolling about 2.0.
The main scheme of aforementioned the present invention and each further selection scheme thereof can independent assortment to form multiple scheme, be the present invention and can adopt and claimed scheme.As the present invention, each select can and main scheme and other select any combination, those skilled in the art can understand there is multiple combination according to prior art and common practise after understanding the present invention program, do not do exhaustive at this.
Beneficial effect of the present invention: process milling method of the present invention, improve rolling stable state, effectively ensure that the structure property of product, reduce steel scrap rate, lumber recovery promotes, reduce roller consumption simultaneously, thus decrease rolling cost, improve the quality of stainless steel product, surface quality, dimensional accuracy, template, machinability are good, can meet user's instructions for use completely, add the market competitiveness of stainless steel product.
Accompanying drawing explanation
Fig. 1 is stainless steel production technological process of the present invention;
Finish rolling F7 outlet temperature under the frame friction speed of mm finishing mill unit end when Fig. 2 is rolling J4-X 2.5*1235 of the present invention;
Fig. 3 is rolling scaduled schematic diagram during finish rolling rolling procedure of the present invention controls;
In figure, 1 is walking beam furnace, 2 for dephosphorization case 1,3 be E1/R1 roughing mill, 4 is Coil Box, and 5 is crop flying shear, 6 be dephosphorization case 2,7 be mm finishing mill unit, 8 is section cooling, and 9 is downcoiler.
Detailed description of the invention
As Figure 1-3, following non-limiting examples is for illustration of the present invention.
1, temperature optimization:
The impact of rolling Thin Specs temperature comprises furnace temp impact and band steel affects at mill temperature.Some knowhows show, raising heating furnace each section of furnace temperature of appropriateness and slab time inside furnace when rolling Thin Specs, control tapping (rolling) rhythm to ensure the tapping temperature of slab simultaneously, are conducive to reducing rolling load, raising rolling stability.Find under study for action:
When furnace temp is lower or temperature is unstable:
1, during rolling Thin Specs J4-2 2.5*1235, two add temperature controls at 1172-1192 DEG C, and soaking zone temperature controls at 1221-1239 DEG C.As can be seen from the table, under this heating cycle, frame load is heavier.
Under tapping temperature same case, heating furnace two adds temperature and is reduced to 1165 DEG C gradually by 1193 DEG C, if constantly reduce heating furnace two to add the load that furnace temperature will certainly have influence on milling train in rolling procedure.
Tapping (rolling) rhythm is on entry temperature at finishing and roll-force impact.The statistics done with rolling 304 2.8*1240 roll-force trend and research (precondition: thick, finish rolling rolling procedure is constant), coil of strip totally 19 pieces, tapped 19 pieces in 145 minutes, on average went out one block of steel with 7.6 minutes to be rolled, its each frame roll-force change is as follows: F1 increases comparatively obvious gradually, and F2 has increase tendency, and F3 increases gradually, F4 has increase tendency, but less, F5 increases gradually, and increase obviously, the change of F6 roll-force is little, and F7 roll-force increases gradually.
Further, temperature optimization or each section of temperature stabilization are added to heating furnace two:
1) heating furnace two adds temperature and rises to 1207 DEG C by 1190 DEG C, soaking zone 1235-1240, after rise to 1256 again, and keep its each section of furnace temperature always, when rolling J4-X 2.5*1235: F1 mill rolling force is stablized and had the trend that diminishes, F2 mill rolling force is stablized and is had the trend that diminishes, and F3 mill rolling force is stablized, F4 mill rolling force is stablized and is had the trend that diminishes, and F5-F7 mill rolling force is stablized.
Thus, temperature controls to be defined as the most at last: heating furnace two adds temperature and controls at 1230 ± 20 DEG C, this section of minimum time 40min of temperature, and soaking zone temperature controls at 1270 ± 20 DEG C, this section of minimum time 35min of temperature.
2, speed-optimization:
improve roughing the 5th pass speed:
When speed is 4.2m/s:
RDT observed temperature: 1102.48, intermediate blank transmission time: 65s, intermediate blank temperature calculations: 1031.48, FET observed temperature: 1011.06, intermediate blank transmission time: 48s, intermediate blank temperature calculations: 1003.5.
When speed is 4.5m/s:
RDT observed temperature: 1109.65, intermediate blank transmission time: 61s, intermediate blank temperature calculations: 1043.30, FET observed temperature: 1013.34, intermediate blank transmission time: 48s, intermediate blank temperature calculations: 1005.75.
improve finishing speeds:
As shown in Figure 2, before improving, during ultra-thin gauge rolling, F7 speed is generally all arranged on 7.5 ~ 8.0m/s, and when rolling Thin Specs, mill speed is too low.
Thus, final speed controls to be defined as: roughing the 5th passes speeds control is at 4.5m/s, and finishing speeds controls at more than 9m/s.
3, rolling schedule optimization:
roughing rolling schedule optimization:
Roughing load is optimized.Finally be defined as, by the sharing of load of front passage to rear a few passage, by 28%, 30%, 32,29%, 28% becomes 27%, 28%, 30%, 31%, 30%;
Reduce passage de-scaling, reduce the de-scaling of roughing passage when rolling Thin Specs.Passage de-scaling is made as 1 time by 2 secondary controls.
The optimization of workpiece thickness, is arranged the workpiece thickness of different size different-thickness.Result of the test for when rolling Thin Specs workpiece thickness to be arranged on 28 ± 1mm the most suitable, when being greater than 28mm, finish rolling load is influenced, and when being less than 26mm, roughing road primary current increases, and there will be motor overload situation.
finish rolling rolling schedule optimization:
Optimize tension force setting, according to kink adjustment situation, strengthen Thin Specs unit tension, a few frame unit tension especially, guarantees that frame rolling conditions is very stable, reduces between frame because rolling the strip shake that Thin Specs causes.Finally be defined as, between each frame, loop tension controls at L1:6t, L2:5t, L3:5t, L4:4.5t, L5:4t, L6:3.5t.
Produce Thin Specs band, each frame reduction ratio significantly improves, and arrangement and the traditional handicraft of its rolling schedule are different, for this reason, distributing needs to the pressure of frame and be optimized, distributing by optimizing pressure, production board shape can be made, glacing flatness is easy to control, reduce heap steel accident.Mm finishing mill unit rear frame reduction ratio is excessive, will control to cause larger difficulty to strip profile and flatness.Utilize the roller footpath of F1, F2 frame comparatively large, there is not the problem of nipping, rolled piece is in high temperature again, should apply comparatively heavy reduction, to reduce the pressure load of frame below, completes target Crown control simultaneously.Finally be defined as, each frame spatial load forecasting is, F1:40%, F2:40%, F3:38%, F4:32%, F5:36%, F6:20%, F7:6-9%.
Afterbody compensate function all has input at present in a lot of AGC system, mainly contains pressure tail and draws tail two kinds of modes.Traditional pressure tail is all when tail part of band steel leaves Fi-1 frame, strengthens the drafts of Fi frame, loses thick the jumping of opening with temperature drop generation to compensate tail part of band steel; Or the mode of " drawing tail " of employing, when namely tail part of band steel leaves Fi frame, reduces the speed of Fi+1 frame, make Fi+1 and Fi+2 interstand tension strengthen, affect one with what compensate the disappearance of Fi and Fi+1 interstand tension.Make discovery from observation, if only regulate the pressure of Fi frame when Fi-1 frame throws steel, control effects is not fine, and tail part of band steel quality still can not get good improvement, therefore have employed the method that tail pressed by two framves simultaneously, namely at Fi-2.Time frame throws steel, Fi and Fi-1 frame is depressed simultaneously.
Loop tension is optimized, and suitably strengthen loop tension between each frame, make rolling more stable: in hot continuous rolling, tension force is set with a relatively-stationary a reference value, carries out when Minimal Tension regulates around a reference value.But existingly facts have proved, less than normal when rolling Thin Specs, rear frame rolling is unstable, and between frame, very large shake appears in strip, thin plate heap steel rate increases.After suitably heightening a reference value, rear frame rolling is stablized, and between frame, strip shake obviously reduces, and thin plate heap steel rate reduces greatly.
Thin Specs loop tension Optimal Example:
Rolling scaduled layout optimization, after more renewing roller, is all 28 blocks of slabs, rolling scaduled layout contrast when rolling specs is identical:
Direct Rolling Thin Specs after 4.0mm slab rolling, because roller heat convex degree learning is unstable, may cause head threading instability or afterbody to be fried rotten.
After 4.0mm slab rolling after excessive 1-2 block 3.0mm slab rolling, reroll Thin Specs processed, and template easily regulates, and rolling is stablized, but 4.0 thickness are wayward.
Direct Rolling Thin Specs after 1-3 block 3.0mm slab rolling, rolling is stablized, and thickness is easy to control, but operating technology level requirement is high.
As shown in Figure 3, carry out the plan of non-hopping from thick to thin, transition thickness 0.2 ± 0.15mm, Direct Rolling 2.5-2.85mm specification slab after 1-3 block 3.0mm slab rolling.Specifically be followed successively by 3.0mm slab rolling three pieces, 2.85mm slab rolling two pieces, 2.5mm slab rolling ten pieces, 2.85mm slab rolling six pieces, 3.0mm slab rolling six pieces, 4.0mm slab rolling one piece.
In addition, few at excessive sheet material, when specification is more single, operating technology level requirement is high, has rolling unsteady phenomena (afterbody rolls rotten).
Adopt lubrication and rolling technology, for the rolling Thin Specs torrid zone, hot-rolling lubricating technology has important function, and it can reduce roll-force, reduces roll loss, improve surface quality, and this is special distinct issues in the rolling Thin Specs torrid zone just.
Finally be defined as: come into operation F2-F5 frame, oil mass is 50 milligrams, delays oil spout in 1 second, throws steel first 1 second pass oil when sequential is threading.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a Thin Specs stainless steel product operation of rolling control method, is characterized in that comprising:
1) temperature controls: heating furnace two adds temperature and controls at 1230 ± 20 DEG C, this section of minimum time 40min of temperature, and soaking zone temperature controls at 1270 ± 20 DEG C, this section of minimum time 35min of temperature;
2) speeds control: roughing the 5th passes speeds control is at 4.5m/s, and finishing speeds controls at more than 9m/s;
3) rolling procedure controls:
Roughing rolling procedure controls: each passage spatial load forecasting is 27%, 28%, 30%, 31%, 30%, and passage de-scaling controls to be 1 time, and workpiece thickness controls at 28 ± 1mm;
Finish rolling rolling procedure controls: each frame spatial load forecasting is, F1:40%, F2:40%, F3:38%, F4:32%, F5:36%, F6:20%, F7:6-9%.
2. Thin Specs stainless steel product operation of rolling control method as claimed in claim 1, is characterized in that: described rolling procedure controls also to comprise loop tension between each frame and controls at L1:6t, L2:5t, L3:5t, L4:4.5t, L5:4t, L6:3.5t.
3. Thin Specs stainless steel product operation of rolling control method as claimed in claim 1, is characterized in that: described rolling procedure controls also to comprise afterbody and compensates: namely when Fi-2 frame throws steel, Fi and Fi-1 frame is depressed simultaneously, and i is 3,4,5,6 or 7.
4. Thin Specs stainless steel product operation of rolling control method as claimed in claim 1, is characterized in that: described rolling procedure controls also to comprise rolling scaduled control: the plan carrying out non-hopping from thick to thin, transition thickness 0.2 ± 0.15mm.
5. Thin Specs stainless steel product operation of rolling control method as claimed in claim 4, is characterized in that: Direct Rolling 2.5-2.85mm specification slab after 1-3 block 3.0mm slab rolling.
6. Thin Specs stainless steel product operation of rolling control method as claimed in claim 5, it is characterized in that: in 28 pieces of slab rollings, rolling scaduled control is followed successively by 3.0mm slab rolling three pieces, 2.85mm slab rolling two pieces, 2.5mm slab rolling ten pieces, 2.85mm slab rolling six pieces, 3.0mm slab rolling six pieces, 4.0mm slab rolling one piece.
7. Thin Specs stainless steel product operation of rolling control method as claimed in claim 1, is characterized in that: adopt hot-rolling lubricating technology, be specially: come into operation F2-F5 frame, oil mass is 50 milligrams, delays oil spout in 1 second, throws steel first 1 second pass oil when sequential is threading.
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| CN104384203B (en) * | 2014-11-16 | 2016-07-06 | 新余钢铁集团有限公司 | Prevention thickness is not more than the milling method of 4mm hot-strip sideslip |
| CN105665450B (en) * | 2016-01-15 | 2017-08-15 | 山西太钢不锈钢股份有限公司 | Hot continuous rolling thin specification steel plate milling train kink void set gantry speed control method |
| CN106552831B (en) * | 2016-06-28 | 2019-07-12 | 东北大学 | A kind of manufacturing method of thin gauge hot-strip |
| CN109092892A (en) * | 2018-06-20 | 2018-12-28 | 新疆八钢铁股份有限公司 | Prevent the milling method that tail part of band steel is rolled brokenly |
| CN111633027A (en) * | 2020-06-11 | 2020-09-08 | 攀钢集团攀枝花钢钒有限公司 | Rolling method for prolonging service life of roller for conventional hot continuous rolling thin-specification strip steel |
| CN112496034B (en) * | 2020-11-30 | 2022-03-22 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
| CN112935012A (en) * | 2021-02-23 | 2021-06-11 | 山西太钢不锈钢精密带钢有限公司 | Method for coiling precision stainless steel foil with variable inner diameter |
| CN114643279A (en) * | 2022-01-29 | 2022-06-21 | 安阳钢铁股份有限公司 | Method for controlling shape of ultrathin ultra-wide steel strip for continuous galvanizing |
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