CN101745544A - Method for controlling transverse thickness difference of medium-low grade electrical steel - Google Patents
Method for controlling transverse thickness difference of medium-low grade electrical steel Download PDFInfo
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- CN101745544A CN101745544A CN201010022012A CN201010022012A CN101745544A CN 101745544 A CN101745544 A CN 101745544A CN 201010022012 A CN201010022012 A CN 201010022012A CN 201010022012 A CN201010022012 A CN 201010022012A CN 101745544 A CN101745544 A CN 101745544A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 92
- 239000010959 steel Substances 0.000 claims abstract description 92
- 238000005096 rolling process Methods 0.000 claims abstract description 64
- 238000005452 bending Methods 0.000 claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 13
- 238000013000 roll bending Methods 0.000 claims abstract description 12
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000003801 milling Methods 0.000 claims description 35
- 238000005554 pickling Methods 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000002253 acid Substances 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 238000005097 cold rolling Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000758 substrate Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention discloses a method for controlling the transverse thickness difference of medium and low grade electrical steel, which comprises the steps of placing a hot-rolled electrical steel coil with the thickness of 2.0-3.0 mm on an uncoiler for uncoiling and double-cutting a shearing head, welding the hot-rolled electrical steel coil with a previous strip coil by a pinch roll welding machine, stretching the hot-rolled electrical steel coil by a stretch bending straightener, breaking scales, improving the shape of the strip, carrying out acid washing, hot rinsing and drying, and sending the cut edge of the edge cutter to a four-stand six-roller continuous rolling mill set for rolling through a rolling mill inlet loop. The working roll string roll, the working roll bending roll force, the middle roll bending roll force and the working roll convexity of each stand of the continuous rolling mill set are controlled, the rolling mill tension, the reduction ratio, the rolling pressure and the stand tension of each stand are controlled, the strip steel rolled by the last stand of the continuous rolling mill set is cut and coiled, the coiling tension is controlled, and the coiled electrical steel coil is sent to a designated place for storage. The control method solves the problem that the transverse thickness difference of the electrical steel is difficult to control, saves the equipment investment and the production cost, and has popularization value.
Description
Technical field
The present invention relates to a kind of control method, relate in particular to the method for low grade electric steel high accuracy transverse thickness difference in the control that a kind of thickness is 0.5～1.0mm, belong to cold rolled sheet shape control field.
Background technology
In low grade electric steel mainly as various electric machine iron cores and other electric component, be the indispensable magnetically soft alloy of electric power, electronics and war industry, obtained extensive use.
The key technical indexes of low grade electric steel plate shape has vertically (being rolling direction) thickness difference and transverse thickness difference in the measurement, and described transverse thickness difference is meant strip crown and edge thinning.Because the AGC technology of current maturation is adopted in the control of the longitudinal thickness of cold-strip steel, can be stably with the longitudinal thickness difference of band steel be controlled at finished product material thickness ± 1.0% or ± scope of (2～5) um (micron) in, and the factor that influences transverse thickness difference control is many and complicated, and features such as typical nonlinear, multivariable and close coupling are arranged, make cold rolling in the transverse thickness difference control technology of low upright stone tablet electrical sheet lag far behind the development of longitudinal thickness difference control technology.
In recent years, develop rapidly along with domestic automobile industry, electronics industry and household electrical appliances industry, the demand of the low grade electric steel of centering sharply increases, the transverse thickness difference of the low upright stone tablet electrical sheet of centering has proposed more strict requirement simultaneously, the large-scale application of high velocity ram machine for example, transverse thickness difference≤the 15um of low upright stone tablet electric steel plate in requiring during the low upright stone tablet electric steel plate of work in-process, some even requirement≤10um.Therefore domestic main electrical sheet manufacturer more pays attention to improving the quality of cold-rolled electric steel-board shape when further improving output.At present domestic main electrical sheet manufacturer adopts the more advanced milling train and the method for twice side cut to reduce the electrical sheet transverse thickness difference, though these methods can guarantee the transverse thickness difference of electrical sheet, increased equipment investment and reduced the product lumber recovery more than 3%.For example Wuhan Iron and Steel Company and Baoshan Iron and Steel Company adopt the method production electrical sheet that five frame UCMW milling train secondaries are cut edge, and the method that Taiyuan Iron ﹠ Steel Corp adopts a frame 20 roller mill secondaries to cut edge is produced electrical sheet.
Described UCMW milling train has following several to the control mode of plate shape: the positive and negative roller of working roll, the positive roller of intermediate calender rolls, intermediate calender rolls string roller mode and working roll roll shifting, wherein the purpose of working roll roll shifting is the edge drop that produces when cold rolling for compensating, and reduces transverse thickness difference.
Summary of the invention
For solve cold rolling in the low big problem of grade electric steel transverse thickness difference, the invention provides a kind of employing four frames six roller UCM milling trains and produce the method for low grade electric steel in transverse thickness difference≤15um cold rolling, described UCM milling train has the positive and negative roller of working roll, the positive roller of intermediate calender rolls and intermediate roll shifting mode to the control mode of plate shape.
To achieve these goals, the technical solution used in the present invention is: low trade mark hot rolling electrician coil of strip is W800, W1000 or W1300 in of the present invention, and this case is an example with W800 and W1000 only.Hot rolling W800 and W1000 electrician's coil of strip substrate thickness are 2.0～3.0mm, are electrical steel strip (volume).
Use the volume dolly hot rolling electrical steel strip (volume) pack into first uncoiler and second uncoiler, electrical steel strip (volume) uncoiling after two cutting shear to remove the defective part of head and become the band steel, the afterbody that the band steel is delivered to the flash welder place and the off-the-shelf last roll coil of strip by pinch roll welds, band steel after the welding enters stretching-bending straightener by the pickling entry loop and stretches, drawn bending straightening machine scale breading and improve plate shape after the band steel enter descaling bath and remove the iron scale of belt steel surface (the band operating rate of steel in descaling bath is 135～180m/min), and the temperature of descaling bath is controlled at about 85 ℃.(operating rate of band steel in potcher also is controlled at 135～180m/min), and the temperature of hot-air drier is ± 50 ℃ to send into the hot-air drier oven dry after the hot rinsing of band steel process potcher after the pickling.Band steel after pickling, hot rinsing and oven dry enters pickling outlet kink and is cut edge by bead cutter, and the band steel after the side cut enters to be delivered to four frame tandem rolling units behind the milling train entry loop and be rolled.The band steel enters the-rolling mill F1 of four frame tandem rolling units, the band steel raw thickness that enters F1 is 2.141～2.249min, the working roll string roller of F1 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force are that 34 ± 3t and working roll roll crown are 20～60um, the milling train tension force of F1 is 14.7kgf/mm
2, the reduction ratio of F1 is 26.74～28.95%, and the draught pressure of F1 is 1035.60～1038.99t, and tension force between frame (before the F1) is 5.70～5.80kgf/mm
2, the belt steel thickness 1.569～1.598mm that shuts out from F1.The band steel that rolls out from the first rolling mill F1 enters the second rolling mill F2, the working roll string roller of F2 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force are that 34 ± 3t, working roll roll crown are 20～60um, the milling train tension force of F2 is 15.4kgf/mm
2, the reduction ratio of F2 is 41.04～41.19%, and the draught pressure of F2 is 980.39～1009.45t, and tension force is 16.47～17.03kgf/mm between the frame of F1-F2
2, the belt steel thickness that shuts out from F2 is 0.925～0.939mm.The band steel that rolls out from the second rolling mill F2 enters the 3rd rolling mill F3, the working roll string roller of F3 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force are that 34 ± 3t, working roll roll crown are 20～60um, the milling train tension force of F3 is 15.9kgf/mm
2, the reduction ratio of F3 is 36.42～36.77%, and the draught pressure of F3 is 924.14～1002.95t, and tension force is 17.32～17.88kgf/mm between the F2-F3 frame
2, the belt steel thickness that shuts out from F3 is 0.588～0.594mm.The band steel that rolls out from the 3rd rolling mill F3 enters the 4th rolling mill F4, and the milling train tension force of F4 is 13.2kgf/mm
2, the reduction ratio of F4 is 15.14～15.81%, and the roll-force of F4 is 825.93～881.55t, and tension force is 18.03～18.76kgf/mm between the F3-F4 frame
2, the belt steel thickness that shuts out from F4 is 0.499～0.500mm.Thickness be the band steel of 0.499～0.520mm after circle shear is sheared by the coiling machine rolling, coiling tension is 5.18～5.23kgf/mm
2The coil of strip of rolling send designation area to deposit.
Descaling bath is divided into 1
#Groove, 2
#Groove and 3
#Groove, 1
#The HCL concentration of groove is 63g/L, 2
#The HCL of groove is that concentration is 133g/L, 3
#The HCL concentration of groove is 129g/L, and the temperature of descaling bath is controlled at 85 ℃;
From the process of the first rolling mill F1 to the, four rolling mill F4 rolled band steels, with nozzle to the jet surface weight concentration of the working roll of each frame and band steel be 3.5%, the emulsion of temperature 〉=55 ℃, its lubricate.And when the emulsion temperature can not guarantee, can directly open heater emulsion is heated.The emitted dose of emulsion is for being 200～300L/min.
Adopt the method for hanging down the grade electric steel transverse thickness difference in a kind of control that as above technical scheme provides, compared with prior art technique effect is:
1. utilize existing four frames of applicant six roller UCM milling trains to produce low grade electric steel in transverse thickness difference≤15um cold rolling, not only solved a global problem, and saved equipment investment and production cost.
2. technological operation is strong;
3. opened a convenient road for other new varieties of exploitation on four frames, six roller UCM production line of rolling mill.
Description of drawings
Accompanying drawing is the technology arrangement schematic diagram of low upright stone tablet electrical sheet transverse gage difference method in a kind of control of the present invention, also is Figure of abstract of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The present invention carries out on rolling mill production line, what this production line adopted is pickling one milling train associating unit production line, it is the prior art of introducing from external (U.S.), the technological process of whole production line is: unite on the inlet step rate of unit wanting rolling hot rolling electrical sheet (band) volume to hang onto pickling one milling train successively in the hot rolling raw material storage with crane, on this step rate, finish the measurement of coil of strip width and external diameter, and remove tie.Coil of strip is delivered on the traversing coil of strip dolly, delivered to behind the half-twist on the saddle of first uncoiler 1 and second uncoiler, 2 fronts, respectively first uncoiler 1 and second uncoiler 2 are gone in hot rolling electrical sheet (band) package by last volume dolly again.
Steel (band) winds off after two cutting cut the defective part of 3 toppings, the afterbody of being delivered to flash welder 5 places and off-the-shelf last winding steel by pinch roll 4 welds, band steel 6 after the welding stretches by the stretching-bending straightener 8 that pickling entry loop 7 enters descaling bath 9 fronts, drawn bending straightening machine 8 scale breadings and improve plate shape after band steel 6 enter the iron scale that descaling bath 9 is removed band steel 6 surfaces.Band steel 6 after the pickling is through sending into the hot-air drier oven dry after potcher 9 ' hot rinsing.The described band steel 6 of this case is hot rolling electrical sheet W800, W1000 or W1300, and their substrate thickness is 2.0～3.0mm.And pickling is adopted is the pickling of three sections shallow slot turbulent flow types, and the total length of descaling bath 9 is 90.3m, is the rinsing of four-part form hot water drift formula and rinsing is adopted, hot water potcher 9 ' length overall 13.05m, hot water drift groove 9 ' temperature can be 40～50 ℃ of selections.Descaling bath 9 minutes 1
#Groove, 2
#Groove and 3
#Groove, wherein 1
#The hydrochloric acid of groove (HCL) concentration is 63g/L, 2
#The concentration of hydrochloric acid of groove is 133g/L, 3
#The concentration of hydrochloric acid of groove is 129g/L, and the temperature of descaling bath 9 is controlled at about 85 ℃, and the operating rate of band steel 6 in descaling bath 9 is 135～180m/min.Band steel 6 potcher 9 ' in operating rate also can be controlled in 135～180m/min, and hot-air drier (not marking in Fig. 1) can adopt electric heater, its Controllable Temperature is built in about 50 ℃.Band steel 6 after pickling, hot rinsing and oven dry are handled enters pickling outlet kink 10.According to the up and down production requirement of operation, band steel 6 can be cut edge or not cut edge on pickling export the bead cutter 11 in kink 10 exits.After the band steel 6 that bead cutter 11 is cut edge enters milling train entry loop 12, deliver to four frame tandem rolling units 13 and carry out continuous rolling.As can be known, whole piece acid is rolled combined production line and is provided with three sections kinks altogether: pickling entry loop 7, pickling outlet kink 10 and milling train entry loop 12, wherein the maximum kink amount of pickling entry loop 7 is 594m, the maximum kink amount of pickling outlet kink 10 is 282.8m, the maximum kink amount of milling train entry loop 12 is 325m, thereby has guaranteed sour the carrying out smoothly of production line continuous rolling of rolling.
First rolling mill of described four frame tandem rolling units 13 is that F1, second rolling mill are that F2, the 3rd rolling mill are that F3 and the 4th rolling mill are F4, milling train F1, milling train F2, milling train F3 and milling train F4 are six roller UCM milling trains, and band steel 6 passes between the working roll of each milling train.
Band steel 6 enters the first rolling mill F1 of four frame tandem rolling units 13 from milling train entry loop 12, and the raw thickness that enters the band steel 6 of F1 is 2.141～2.249mm.The working roll string roller of F1 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t (ton), intermediate calender rolls bending roller force are that 34 ± 3t and working roll roll crown are 20～60um, the milling train tension force of F1 is 14.7kgf/mm
2, the reduction ratio of F1 is 26.74～28.95%, the draught pressure of F1 is 1035.60～1038.99t; Between frame 5.70～5.80kgf/mm
2, the thickness of the band steel 6 that shuts out from F1 is 1.569～1.598mm.The band steel 6 that rolls out from the first rolling mill F1 enters the second rolling mill F2, the working roll string roller of F2 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force 34 ± 3t, working roll roll crown are 20～60um, the milling train tension force of F2 is 15.4kgf/mm
2, the reduction ratio of F2 is 41.04～41.19%, and the draught pressure of F2 is 980.39～1009.45t, and tension force is 16.47～17.03kgf/mm between the F1-F2 frame
2, the thickness of the band steel 6 that shuts out from F2 is 0.925～0.939mm.The band steel 6 that rolls out from the second rolling mill F2 enters the 3rd rolling mill F3, the working roll string roller of F3 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls roller cutter are that 34 ± 3t, working roll roll crown are 20～60um, the milling train tension force of F3 is 15.9kgf/mm
2, the reduction ratio of F3 is 36.42～36.77%, and the draught pressure of F3 is 924.14～1002.95t, and tension force is 17.32～17.88kgf/mm between the F2-F3 frame
2, the thickness of the band steel 6 that shuts out from F3 is 0.588～0.594mm.The band steel 6 that shuts out from the 3rd rolling mill F3 enters the 4th rolling mill F4, and working roll string roller, work roll bending power, intermediate calender rolls bending roller force and the working roll roll crown of F4 are not done other setting, with UCM milling train prior art parameter.The milling train tension force of F4 is 13.2kgf/mm
2, the reduction ratio of F4 is 15.14～15.81%, and the draught pressure of F4 is 825.93～881.55t, and tension force is 18.03～18.76kgf/mm between the F3-F4 frame
2, the band steel 6 that rolls out from F4 ' thickness be 0.499～0.500mm.Enter from band steel 6 the band steel 6 that the first rolling mill F1 to the, four rolling mill F4 roll out 0.499～0.500mm ' the operation of rolling, all between the working roll of F1, F2, F3 and F4 and band steel 6, spray emulsion, it is a kind of compound lard that arrives roll (working roll) and the surperficial lubricate of rolled piece (band steel 6) between rolling-mill housing with nozzle ejection, it is in company with one product from the import of U.S. Kui Ke company of UCM milling train, concentration (weight) is about 3.5%, the emulsion temperature is controlled at 〉=and 55 ℃.Control the emitted dose of emulsion well.
Enter four frame tandem rolling units 13 when rolling at band steel 6, have calibrator, tensometer, tachymeter and pressure sensor etc. that various technical parameters are carried out on-line measurement.
Band steel 6 from F4 after rolling ' batch rolling by coiling machine 15, when the band steel 6 ' weight or length reach defined value the time, earlier shear bundling through the circle shear 14 that is arranged on tandem rolling unit 13 ports of export, band steel 6 after the shearing ' by coiling machine 15 rolling, the coiling tension during rolling is 5.18～5.23kgf/mm
2Coil of strip after batching is unloaded and is delivered to the outlet step rate by coil stripping car, coil of strip transports by step rate and weighs in transportation, delivers to the appointed area behind the bundling and deposits.
Through above control method produce cold rolling in the transverse gage of low grade electric steel (mainly being meant W800 and W1000) can be 0.5～1.0mm, transverse thickness difference is controlled at 10-15 micron (um) scope, reaches described purpose.
Claims (1)
1. the method for low grade electric steel transverse thickness difference in the control, use the volume dolly first uncoiler (1) and second uncoiler (2) are gone in the package of hot rolling electrical steel strip, electrical steel strip winds off after two cutting cut the defective part of (3) topping, delivering to flash welder (5) by pinch roll (4) locates to weld with the afterbody of the off-the-shelf last roll coil of strip, band steel (6) after the welding stretches by the stretching-bending straightener (8) that pickling entry loop (7) enters descaling bath (9) front, it is characterized in that: drawn bending straightening machine (8) scale breading and improve plate shape after band steel (6) enter the iron scale that descaling bath (9) is removed band steel (6) surface, the band operating rate of steel (6) in descaling bath (9) is 135～180m/min; Send into the hot-air drier oven dry after the hot rinsing of band steel (6) process potcher (9 ') after the pickling, the operating rate of band steel (6) in potcher (9 ') is controlled at 135～180m/min, and the temperature of hot-air drier is ± 50 ℃; Band steel (6) after pickling, hot rinsing and oven dry are handled enters pickling outlet kink (10) and is cut edge by the bead cutter (11) that pickling outlet kink (10) is located, delivers to four frame tandem rolling units (13) and carry out continuous rolling after the band steel (6) that bead cutter (11) is cut edge is entering milling train entry loop (12);
Band steel (6) enters the first rolling mill F1 of four frame tandem rolling units (13) from milling train entry loop (12), and the raw thickness that enters the band steel (6) of F1 is 2.141～2.249mm; The working roll string roller of F1 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force are that 34 ± 3t and working roll roll crown are 20～60um, the milling train tension force of F1 is 14.7kgf/mm
2, the reduction ratio of F1 is 26.74～28.95%, the draught pressure of F1 is 1035.60～1038.99t, is 5.70～5.80kgf/mm before the tension force F1 between frame
2, the thickness of the band steel (6) that shuts out from F1 is 1.569～1.598mm; The band steel (6) that goes out from the first rolling mill F1 mechanism enters the second rolling mill F2, the working roll string roller of F2 is-25～-30mm/-25～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force are that 34 ± 3t, working roll roll crown are 20～60um, the milling train tension force of F2 is 15.4kgf/mm
2, the reduction ratio of F2 is 41.04～41.19%, and the draught pressure of F2 is 980.39～1009.45t, and tension force is 16.47～17.03kgf/mm between the F1-F2 frame
2, the thickness 0.925～0.939mm of the band steel (6) that shuts out from F2; The band steel (6) that rolls out from the second rolling mill F2 enters the 3rd rolling mill F3, the working roll string roller of F3 is-25～-30mm/-25mm～-30mm, work roll bending power are that 32 ± 3t, intermediate calender rolls bending roller force are that 34 ± 3t, working roll roll crown are 20～60um, the milling train tension force of F3 is 15.9kgf/mm
2, the reduction ratio of F3 is 36.42～36.77%, and the draught pressure of F3 is 924.14～1002.95t, and tension force is 17.32～17.88kgf/mm between the F2-F3 frame
2, the thickness of the band steel (6) that shuts out from F3 is 0.588～0.594mm; The band steel (6) that rolls out from the 3rd rolling mill F3 enters the 4th rolling mill F4, and the milling train tension force of F4 is 13.2kgf/mm
2, the reduction ratio of F4 is 15.14～15.81%, and the roll-force of F4 is 825.93～881.55t, and tension force is 18.03～18.76kgf/mm between the F3-F4 frame
2, the thickness of the band steel (6 ') that shuts out from F4 is 0.499～0.500mm; By coiling machine (15) rolling, coiling tension is 5.18～5.23kgf/mm to band steel (6 ') after circle shear (14) is sheared
2, coil of strip send designation area to deposit; Wherein
The pickling of three sections shallow slot turbulent flow types is adopted in the pickling of band steel (6), and descaling bath (9) divides 1
#Groove, 2
#Groove and 3
#Groove, 1
#The concentration of hydrochloric acid of groove is 63g/L, 2
#The concentration of hydrochloric acid of groove is 133g/L, 3
#The concentration of hydrochloric acid of groove is 129g/L, and the temperature of descaling bath is controlled at 85 ℃;
From the process of the first rolling mill F1 to the, four rolling mill F4 rolled band steels (6), with the working roll and emulsion from band steel (6) table to injection lubricate of nozzle to each frame, the weight concentration of emulsion is 3.5%, the temperature of emulsion is controlled at 〉=and 55 ℃, the emitted dose of emulsion is 200～300L/min.
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| CN2010100220126A CN101745544B (en) | 2010-01-04 | 2010-01-04 | Method for controlling transverse thickness difference of medium-low grade electrical steel |
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| CN2010100220126A CN101745544B (en) | 2010-01-04 | 2010-01-04 | Method for controlling transverse thickness difference of medium-low grade electrical steel |
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