CN105312359A - Strip shape control method for low-temperature annealed strip steel - Google Patents
Strip shape control method for low-temperature annealed strip steel Download PDFInfo
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- CN105312359A CN105312359A CN201410338313.8A CN201410338313A CN105312359A CN 105312359 A CN105312359 A CN 105312359A CN 201410338313 A CN201410338313 A CN 201410338313A CN 105312359 A CN105312359 A CN 105312359A
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- direct combustion
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Abstract
The invention provides a strip shape control method for low-temperature annealed strip steel. The method comprises the steps that the heating temperature of a direct combustion section is controlled to be 100 DEG C-120 DEG C lower than that of a uniform heating section of a horizontal annealing furnace, the opening degree of valves of all areas of the direct combustion section is kept within the range of 40%-60%, and the furnace pressure of the uniform heating section is kept at 150+/-8 Pa and is always 10-20 Pa higher than that of the direct combustion section; the positive roll bending force of a flatting work roll is controlled at 100-150 KN to enable the rolling force of the work roll on the two side portions to be smaller than 50 KN, the lifting height of an A/C roll is controlled within the range of 80-95 mm and the lifting height of a C/B roll is controlled within the range of 35-50 mm according to the different thicknesses of the strip steel, and the outlet tensile force of the strip steel is 5 KN larger than the inlet tensile force of the strip steel; No.1 unit and No.2 unit of a withdrawal straightening machine are put into use simultaneously, the insertion amount of the withdrawal straightening machine is controlled within the range of 10-12mm, and the tensile force of the withdrawal straightening machine is controlled within the range of 30-90 KN. According to the strip shape control method, edge waves can be effectively eliminated, and the strip shape and elongation requirements can be met.
Description
technical field:
The present invention relates to a kind of board-shape control method of process annealing band steel.
background technology:
In modern cold-rolling galvanization technique, the employing of Horizental annealer is a kind of very general scheme.Can be divided into: preheating section (PHS)-direct combustion section (DFS)-soaking zone (RHS)-rapid cooling section (CS), wherein direct combustion section (DFS) and soaking zone (RHS) are two the most important techniques affecting rear strip property of annealing.
In Horizental annealer, direct combustion section (DFS) burner is distributed in band steel both sides, the heating on strip width direction will be caused uneven, and soaking zone adopts the mode of radiant tube heating, this kind of mode homogeneous heating in heating process.
When soaking zone (RHS) and direct combustion section temperature difference hour in production, particularly comparatively obvious when the band steel of production annealing temperature lower 550 ~ 730 DEG C, so just occur being with steel to prolong the annealing inequality of width, when there is this annealing and being uneven, edge annealing temperature will be produced higher than intermediate anneal temperature, cause edge yield strength to be less than middle yield strength, extend will extend greatly than middle part through edge after levelling withdrowal straightening, cause limit wave.
Summary of the invention
The object of the invention is the board-shape control method that a kind of process annealing band steel is provided for above-mentioned Problems existing, can effectively eliminate limit wave, meet plate shape and percentage elongation requirement.
Above-mentioned object is achieved through the following technical solutions:
The board-shape control method of process annealing band steel, the method comprises: carry out parameter optimization control respectively to Horizental annealer, planisher and withdrawal straightening machine, described comprises the control of Horizental annealer: control Horizental annealer direct combustion section heating-up temperature lower than soaking zone 100 ~ 120 DEG C, direct combustion Duan Ge district valve openings degree remains between 40% ~ 60%, soaking zone furnace pressure should remain on 150 ± 8Pa, will exceed direct combustion 10 ~ 20Pa all the time simultaneously; The control of planisher is comprised: the just curved bending roller force of work roll for temper mill controls at 100 ~ 150KN, working roll is made to be less than 50KN in the roll-force of both sides part cloth, according to the thickness of band steel is different A/C roller lifted Altitude control between 80 ~ 95mm, C/B roller lift Altitude control between 35 ~ 50mm, band steel the large 5KN of outlet warp tension ratio entrance tension force; Comprise the control of withdrawal straightening machine: withdrawal straightening machine 1#, 2# unit comes into operation simultaneously, the insertion of withdrawal straightening machine controls at 10 ~ 12mm, and withdrawal straightening machine tension force controls between 30 ~ 90KN.
Accompanying drawing explanation
Fig. 1: Horizental annealer direct combustion section (DFS) top view;
Fig. 2: Horizental annealer and soaking zone (RHS) top view;
Fig. 3: the main TV structure schematic diagram of planisher, in figure: 1-leveling-machine supporting-roller, 2-planisher working roll;
Fig. 4: the side-looking structural representation of planisher, in figure: 3-A/C roller 4-C/B roller;
Fig. 5: withdrawal straightening machine artwork;
Fig. 6: butterfly valve opening degree and variations in flow rate.
Fig. 7 is table one.
Fig. 8 is table two.
Detailed description of the invention
The board-shape control method of process annealing band steel, the method comprises:
Control to Horizental annealer:
1. by improving and optimizating direct combustion section (DFS) and the temperature difference of soaking zone (RHS), reducing the heating-up temperature of direct combustion section, making its heating-up temperature lower than soaking zone 100 ~ 120 DEG C.To increase the heating and thermal insulation accounting of soaking zone in annealing process, the annealing in the direction of the width of band steel is made more to be tending towards even.Test data shows (referring to table one), along with direct combustion section (DFS) and the increase of soaking zone (RHS) temperature difference, the yield strength of edge is more and more tending towards 1 with middle yield strength ratio, illustrate when after the temperature difference increasing direct combustion section (DFS) and soaking zone (RHS), because the heating accounting of soaking zone improves, add the anneal uniformity of band steel on width, edge yield strength increases to some extent, reduce steel edge portion poor with middle yield strength, this reduces the wave of the limit after levelling withdrowal straightening because inequality of annealing causes.
When direct combustion section (DFS) is greater than 120 DEG C with the temperature difference of soaking zone (RHS), edge and middle yield strength change less.Consider direct combustion section (DFS) thermal-stable simultaneously, and the heating accuracy of soaking zone (RSH), therefore select direct combustion section (DFS) heating-up temperature lower than soaking zone (RSH) 100 ~ 120 DEG C.
2. direct combustion Duan Ge district valve openings degree remains between 40% ~ 60%, ensures the stability of gas flow, and makes the stable fluctuation of direct combustion section heating power little.In production, direct combustion section coal gas and air mass flow control mainly through butterfly valve, this kind of valve body nonlinear Control (see figure 4), opening degree is larger, the rate of change of flow is less, when opening degree is less than 30%, because the rate of change with the change air of opening degree, the flow of coal gas is larger, the fluctuation back and forth of direct combustion section temperature will be caused, be difficult to stablize.When opening degree is greater than 70%, along with opening degree change coal gas, air mass flow change less, direct combustion section thermotonus is paused late, temperature regulate slower.For making it in stable the regulating furnace temperature of energy, controlled 40%% ~ 60%.
In order to ensure that butterfly valve opening degree is 40%% ~ 60%, by closing the some heating regions of direct combustion section, region gas flow can used to strengthen, making its opening degree 40% ~ 60%, guarantee the thermal-stable of direct combustion section.
3. soaking zone furnace pressure should remain on 150 ± 8Pa, will exceed direct combustion 10 ~ 20Pa all the time simultaneously, with prevent direct combustion section hot-air adverse current.Furnace gas is the traffic direction flowing against band steel under normal circumstances, due to process annealing, makes in direct combustion section combustion process, 2CO+O
2=2CO
2the furnace pressure difference effect that the minimizing of air is formed reduces, cause the adverse current of direct combustion section gas, cause the fluctuation of soaking zone temperature, keep soaking zone to keep exceeding direct combustion section 10 ~ 20Pa all the time at 150 ± 8Pa by the draft of exhaust gas fan simultaneously, effectively can prevent the adverse current of direct combustion section hot gas, ensure that the stable fluctuation of the annealing temperature of soaking zone is little.
Control to planisher:
1. the just curved bending roller force of work roll for temper mill controls at 100 ~ 150KN, makes working roll be less than middle part roll-force in the roll-force of both sides part cloth, thus reduces its two edge percentage elongation, increase the percentage elongation at middle part.Because process annealing band steel inevitably exists the annealing uneven phenomenon of edge annealing temperature higher than centre in annealing furnace, edge percentage elongation will be made after smooth to be greater than middle percentage elongation, produce limit wave.
The present invention is uneven in order to balance this percentage elongation after smooth on width, large bending roller force is carried out to work roll for temper mill, it is made to be formed curved, from in the past to be uniformly distributed layout different, roll surface width direction is formed the layout of roll-force narrowing toward each end broad in the middle, beat to reduce it, both sides roll-force N
in-N
limit≤ 50KN.Make band steel just exist after skin pass rolling certain in wave, wave highly controls within 5mm, because bend tension is carried out in the easier region lower to edge yield strength of withdrawal straightening machine, wave in can guaranteeing so effectively to eliminate after straightening, and avoid the generation of aberration.
2. according to the thickness of band steel is different A/C roller lifted Altitude control between 80 ~ 95mm, C/B roller lift Altitude control between 35 ~ 50mm, to guarantee the stability of band steel in the operation of rolling.Due to the effect of large bending roller force, make beating of working roll amid a sharp increase, particularly the beating of top working roll, the angle that at this time will enter planisher band steel changes to some extent, degree of the raising control of A/C roller is increased between 80 ~ 95mm by 60 original ~ 75mm, to guarantee to be with steel to enter the stable of planisher, avoid the formation of because rolling is nipped fluctuation, generation blemish.The degree of raising of corresponding C/B roller is also increased between 35 ~ 50mm from 30 original ~ 40mm.
3. the entrance tension force with steel is set as f=1.2dl (f-tension force, d-thickness, l-width), the large 5KN of outlet warp tension ratio entrance tension force.Due to the roll-force uneven distribution of work roll for temper mill, make rolling front and back belt just on width percentage elongation distribution and uneven, define the phenomenon that middle part percentage elongation is greater than edge percentage elongation, after band steel forms middle wave, the distribution of tension force also there occurs change, and the local tension distribution that percentage elongation is little is large, and the middle unrestrained region that percentage elongation is larger, tension distribution is little, causes the band steel in the operation of rolling to shake, causes broken belt after time serious.In order to uneven with firm tension distribution in the balanced operation of rolling, when production process annealing steel grade, the k value of original tension force f=kdl (k-coefficient) is increased to 1.2 by original 1.Can make edge that larger elastic deformation occurs like this, after just there is not larger elastic deformation, in middle part, unrestrained regional nature does not divide more tension force, ensure that band steel stablizing in smoothing and rolling process.
Control to withdrawal straightening machine:
1. withdrawal straightening machine 1#, 2# unit comes into operation simultaneously.
Withdrawal straightening machine 1#, 2# unit is that the using and the reserved use, generally only drop into one group of use, up-down rollers mainly through being in staggered distribution up and down forms flecition power to band steel, on band steel, apply certain tensile stress simultaneously, the acting in conjunction of bending stress and pre-tensile stress, can effectively be eliminated the different residual stress of band steel on width, to eliminate shape wave.
In production, find when production process annealing band steel, after independent input one group of straightening unit, because the yield strength of process annealing band steel is higher, extensibility is little, local drawing effect is analyzed, find mostly only to there occurs elastic deformation, and plastic deformation does not occur, in order to strengthen its drawing effect, therefore input two unit carry out bend tension to its band steel, find successful after input simultaneously.
2. according to the situation of straightening exit plate shape, insertion controls at 10 ~ 12mm, and withdrawal straightening machine tension force controls between 30 ~ 90KN, prevents its excessive fracture causing weld seam.
From table two experimental data, when percentage elongation is constant, reduce bending unit, increase tension value, middle wave reduces to some extent, but increase tension force again, reduce insertion, middle wave can not reach to be eliminated completely, and simultaneously large tension force also butt welded seam works the mischief, and by increasing insertion, increase the effect of bending stress, reduce tension force effect, the eradicating efficacy for middle wave is good, entered repeatedly the test of different in width thickness steel grade and show that good insertion should between 10 ~ 12mm, withdrawal straightening machine tension force controls between 30 ~ 90KN.
Application example 1:
To produce the process annealing band steel that 0.5 × 1000 annealing temperature is 730 DEG C, after band steel enters annealing furnace, select to close 2Z, 4Z twoth district, allow 1Z, 3Z, 5Z tri-districts gas flows strengthen, its valve openings degree is made to reach about 50%, coal gas and air mass flow reach the less stable state of fluctuation, such direct combustion section strip steel temperature can stability contorting at 620 DEG C ± 10 degree, soaking zone has just had the heating and thermal insulation of 100 ~ 120 degree interval.Thus band steel is improved in soaking zone insulation accounting of being heated, be used for balancing the uneven annealing caused of direct combustion section heating uneven.Soaking zone in order to ensure the stablizing of annealing temperature 730 DEG C, fluctuate little, prevent direct combustion section from causing the adverse current of direct combustion section hot gas to cause the fluctuation of soaking zone furnace temperature due to furnace pressure fluctuation, thus affecting its heating effect, furnace pressure need control will exceed 10 ~ 20Pa than direct combustion section all the time at 150Pa ± 8Pa simultaneously.
Planisher rolling force setup is 1800KN, bending roller force is set as 110KN, make working roll excessively curved, its roll-force on working roll width forms the distribution mode of narrowing toward each end broad in the middle, in the middle part of will forming band steel after being applied to band steel, percentage elongation is greater than both sides percentage elongation, band steel is made just to have certain little middle wave when going out planisher, wave is high to be controlled in 5mm, in order to ensure the stability of the operation of rolling, consider the performance of process annealing band steel, A/C roller and C/B roller control respectively at 80mm and 40mm, entrance, outlet tension force is set as 60KN and 65KN respectively, to ensure in its smoothing and rolling process, with the stability of steel, withdrawal straightening machine 1#, 2# unit comes into operation simultaneously, the effect of its wave in tension leveling segment is eliminated is strengthened.Insertion selects 10mm according to going out the elimination situation of wave in after straightening, and straightening tension force controls at 50 ± 5KN, to meet its plate shape and percentage elongation requirement.
Application example 2:
When production 0.288 × 1000, when annealing temperature is the band steel of 550 DEG C, direct combustion section (DFS) is selected only to open 4Z mono-group of burner, makes its heating-up temperature remain on 440 ± 10 DEG C.Soaking zone temperature controls 550 ± 5, and soaking zone furnace pressure remains on 150 ± 8, exceeds direct combustion section 10 ~ 20Pa all the time simultaneously.
Planisher adopts the roll-force of 1800KN, and bending roller force is set as 150KN, and gateway tension force is set as 40KN, 45KN, and A/C roller, C/B roller control at 95mm, 50mm, and band steel goes out that smooth middle wave wave is high should be controlled in 5mm.Withdrawal straightening machine 1#, 2# come into operation simultaneously, and insertion is set as 12mm, increase the accounting of its bending stress in tension straingtening process.Reduce the tensile stress of tension force to band steel, make it control at 35 ± 5KN.To meet its plate shape and percentage elongation requirement.
Below be only most preferred embodiment of the present invention, method of the present invention includes but not limited to the technical scheme disclosed in above-described embodiment, and unaccomplished matter of the present invention belongs to the common practise of those skilled in the art.
Claims (1)
1. the board-shape control method of a process annealing band steel, it is characterized in that: the method comprises: respectively parameter optimization control is carried out to Horizental annealer, planisher and withdrawal straightening machine, described comprises the control of Horizental annealer: control Horizental annealer direct combustion section heating-up temperature lower than soaking zone 100 ~ 120 DEG C, direct combustion Duan Ge district valve openings degree remains between 40% ~ 60%, soaking zone furnace pressure should remain on 150 ± 8Pa, will exceed direct combustion 10 ~ 20Pa all the time simultaneously; The control of planisher is comprised: the just curved bending roller force of work roll for temper mill controls at 100 ~ 150KN, working roll is made to be less than 50KN in the roll-force of both sides part cloth, according to the thickness of band steel is different A/C roller lifted Altitude control between 80 ~ 95mm, C/B roller lift Altitude control between 35 ~ 50mm, band steel the large 5KN of outlet warp tension ratio entrance tension force; Comprise the control of withdrawal straightening machine: withdrawal straightening machine 1#, 2# unit comes into operation simultaneously, the insertion of withdrawal straightening machine controls at 10 ~ 12mm, and withdrawal straightening machine tension force controls between 30 ~ 90KN.
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| CN112779386A (en) * | 2019-11-05 | 2021-05-11 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof |
| CN112813233A (en) * | 2019-11-16 | 2021-05-18 | 上海梅山钢铁股份有限公司 | Hot galvanizing strip steel temperature transition method |
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| CN112779386A (en) * | 2019-11-05 | 2021-05-11 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof |
| CN112813233A (en) * | 2019-11-16 | 2021-05-18 | 上海梅山钢铁股份有限公司 | Hot galvanizing strip steel temperature transition method |
| CN112813233B (en) * | 2019-11-16 | 2022-05-10 | 上海梅山钢铁股份有限公司 | Hot galvanizing strip steel temperature transition method |
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