CN114182079B - Control method for surface rolling lines of cold-rolled deep-drawing steel for outer plate - Google Patents
Control method for surface rolling lines of cold-rolled deep-drawing steel for outer plate Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 92
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000000137 annealing Methods 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 18
- 230000003746 surface roughness Effects 0.000 claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 abstract description 6
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
Abstract
The invention relates to the technical field of metal material processing, in particular to a control method for rolling lines on the surface of cold-rolled deep-drawing steel for an outer plate. The control method is used for controlling the lubrication rolling process, the roller period and the pressing of the hot continuous rolling process, the roller period, the surface roughness and the pressing of the acid continuous rolling process and the roller surface roughness, the peak value number, the roller diameter difference and the through plate leveling force of the continuous annealing process in the cold-rolled deep-drawing steel production process. The control method can improve the surface texture of the cold-rolled deep-drawing steel and obtain the target finished steel coil.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a control method for rolling lines on the surface of cold-rolled deep-drawing steel for an outer plate.
Background
Cold-rolled deep-drawn steel (interstitial free steel) having excellent deep-drawing forming is used in a large amount in the industrial fields of automobiles, home appliances, and the like. In particular, when used for manufacturing outer covers having high requirements such as automobile outer panels and household appliance outer panels, cold-rolled deep-drawn steel is also required to have excellent surface quality, i.e., a surface with zero defects, which is generally known in the steel industry.
As a common and persistent surface quality flaw, surface longitudinal rolling (also called surface rolling) causes a considerable trouble and economic loss to steel production plants for outer panels and downstream customer processing plants. For steel plants, in order to reduce surface rolling lines as much as possible, cold-rolled deep-drawn steel for outer plates is generally produced by using low-roughness high-peak-number chromium plating special rolls; for a processing plant, in order to ensure the appearance vividness of the product, slight surface texture defects can properly increase the thickness of a paint layer of the product, and obvious surface texture defects can only be returned or degraded for use.
CN 102764789A discloses a method for producing an automobile outer plate, which can control the surface morphology of steel for the automobile outer plate by strictly limiting the original roughness of working rolls of a continuous cold rolling mill, a continuous annealing temper mill and a galvanizing temper mill with 5 frames and the peak values of working rolls of a frame F5, a continuous annealing temper mill and a galvanizing temper mill. The method can alleviate the surface rolling line defect of deep drawing steel to a certain extent, but does not consider the inheritance of the surface quality of the hot rolling raw steel plate to the cold rolling finished steel plate, and the low roughness and the extremely high peak value number have high comprehensive quality and processing requirements on the roller, so that the production cost is obviously increased.
CN 110527921B discloses a method for controlling the surface morphology of hot dip galvanized ultra-deep drawn steel for automobile panels, and the method controls the production process, especially the process conditions of cold continuous rolling and hot dip galvanizing, so that the surface roughness and waviness of the hot dip galvanized ultra-deep drawn steel can meet the requirements of automobile factories besides good tensile property. The method can alleviate the surface rolling line defect of the galvanized deep drawing steel to a certain extent, but is not suitable for the cold-rolled deep drawing steel produced by continuous annealing.
CN 110743919A discloses a surface morphology control method of a cold-rolled galvanized product, which controls the surface roughness and the peak value of a steel plate by controlling the surface roughness and the peak value of a working roller of a finishing machine, thereby improving the formability and the coating property of the plate and the strip. The method can alleviate the surface rolling line defect of the galvanized deep drawing steel to a certain extent, but is not suitable for the cold-rolled deep drawing steel produced by continuous annealing.
Disclosure of Invention
Aiming at the technical problem that surface rolling lines exist on the surfaces of cold-rolled deep-drawn steel for high-end cold-rolled automobiles and household appliance outer plates, on the premise of not obviously increasing industrial production cost, the control method for the surface rolling lines of the cold-rolled deep-drawn steel for the outer plates is provided, and the surface texture of a steel plate is improved by adopting a precise lubrication rolling process and controlling the rolling period and the rolling reduction of a finish rolling roller in a hot rolling process, controlling the rolling period, the surface roughness and the rolling reduction of the roller in an acid rolling process, controlling the full-flow control processes such as the surface roughness, the peak value number, the roller diameter difference, the pass plate flattening force and the like in a continuous annealing process, so that a target finished steel coil is obtained.
A control method for the surface rolling lines of cold-rolled deep-drawing steel for an outer plate controls a hot continuous rolling process, an acid continuous rolling process and a continuous annealing process in the production process of the cold-rolled deep-drawing steel, and specifically comprises the following steps:
(1) The hot continuous rolling process adopts seven frames for continuous rolling, F2-F6 frames are lubricated by rolling, the oil quantity of an upper discharge frame of F2-F5 is set to 20ml/min, the oil quantity of a lower discharge frame is set to 30ml/min, the oil quantity of an upper discharge frame of F6 is set to 30ml/min, and the oil quantity of a lower discharge frame is set to 35ml/min; f7 final frame rolling reduction is 13-20%, F7 working roll period is 10-40 km;
(2) The acid continuous rolling process adopts five-frame continuous rolling, the roughness of the working rolls of the F1-F4 frames is respectively 0.75-0.85 mu m, 0.55-0.65 mu m, 0.45-0.55 mu m, and the roughness of the working rolls of the F5 end frames is 3.20-3.50 mu m;
the working roll period of F1-F5 is not more than 1200 tons, the intermediate roll period of F1-F5 is not more than 10000 tons, the support roll period of F1-F3 is not more than 90000 tons, and the support roll period of F4-F5 is not more than 80000 tons;
the F5 end frame is lightly pressed to improve the surface of the strip steel, and the pressing rate is 3.5% -5.0%;
(3) The difference of the roller diameter of the upper and lower working rollers in the continuous annealing process is not more than 0.12mm, the roughness is 2.20-2.50 mu m, and the peak value number is not less than 105/cm; the concentration of the leveling liquid is 2.0-4.5%, the leveling elongation is 0.6-1.0%, and the leveling force of the through plate is controlled at 2000-6000 KN.
Further, the cold rolled deep drawing steel is selected from the group consisting of DC03, DC04, and DC06.
Further, the thickness of the billet processed in the hot continuous rolling process is 230mm, and the width is 1250-1900 mm.
Further, the hot continuous rolling process controls the on-machine roughness of the F7 working roll to be not more than 0.9 mu m.
Further, the F1-F5 machine frame in the acid continuous rolling process uses common rollers, and the F5 machine frame working roller adopts a ceramic grinding wheel for finish grinding.
Further, the continuous annealing process adopts a six-roller leveling machine, and the working roller adopts a ceramic grinding wheel for finish grinding.
Further, the six-point position roughness of the upper surface side, the lower surface side, the middle surface side and the side of the lower line deep drawing steel is controlled to be not lower than 0.75 mu m, the peak value number is not lower than 85/cm, and the roll is immediately replaced on line when the peak value is not consistent with the peak value. And the roll changing operation is guided according to the surface roughness, the peak value number and the like of the finished steel plate, so that the control of the surface rolling lines is facilitated.
Further, the surface roughness of the finished steel coil finally obtained by the control method is 0.80-1.30 mu m, and the peak value number is not lower than 85/cm.
The invention has the beneficial effects that:
according to the control method for the surface rolling lines of the cold-rolled deep-drawing steel for the outer plate, a precise lubrication rolling process is used in a hot continuous rolling process, the rolling period of a finish rolling roller and the reduction of a final pass are controlled, and the fact that the surface texture of a hot-rolled raw material of the deep-drawing steel is compact and no strip-shaped rolling lines exist after pickling is ensured from a source; executing proper roller period, surface roughness and final pass reduction in the acid continuous rolling process to prevent the appearance of plow groove-like short line textures on the surface of the steel plate in a chilled state; the continuous annealing process controls the surface roughness, peak value number, roller diameter difference, smooth plate passing force and the like of the roller, is favorable for uniformly copying roughened points on the surface of the roller to the surface of the steel plate, further improves the surface compactness of the steel plate, and achieves the aim of completely eliminating the longitudinal rolling grain tendency of the surface.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a microscopic topography of surface mill grain defects (. Times.100).
FIG. 2 is a surface microtopography (100 x) without embossing defects.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
According to the conventional DC04 cold-rolled deep-drawing steel component smelting slab, the head and tail slabs are modified to obtain a steel slab with the thickness of 230mm and the width of 1850mm, the steel slab is subjected to hot continuous rolling, acid continuous rolling and continuous annealing processes to produce a finished steel coil, in the production process, parameters such as a hot continuous rolling process lubrication rolling process, a roller period and pressing down, an acid continuous rolling process roller period, surface roughness and pressing down, a continuous annealing process roller surface roughness, peak value number, roller diameter difference and through plate flattening force are controlled, and the specific steps are as follows:
(1) The hot continuous rolling process adopts seven frames for continuous rolling, F2-F6 frames are lubricated by rolling, the oil quantity of an upper discharge frame of F2-F5 is set to 20ml/min, the oil quantity of a lower discharge frame is set to 30ml/min, the oil quantity of an upper discharge frame of F6 is set to 30ml/min, and the oil quantity of a lower discharge frame is set to 35ml/min; the on-machine roughness of the F7 working roller is 0.81 mu m; f7 final frame rolling reduction is 19.2%, F7 working roll period is 22km;
(2) The acid continuous rolling process adopts five-frame continuous rolling, the upper machine roughness of the F1-F4 frame working rolls is respectively 0.77/0.79 mu m, 0.80/0.79 mu m, 0.62/0.60 mu m and 0.47/0.47 mu m, and the upper machine roughness of the F5 end frame working rolls is 3.31/3.35 mu m;
the roll periods of the working rolls from F1 to F5 are 129 tons, 129 tons and the roll periods of the intermediate rolls from F1 to F5 are 5250 tons, 1038 tons, the roller periods of the F1-F3 supporting rollers are 78588 tons, 78588 tons and 78588 tons respectively, and the roller periods of the F4-F5 supporting rollers are 78588 tons and 78588 tons respectively;
the F1-F5 machine frame uses common rollers, the F5 machine frame work roller adopts a ceramic grinding wheel for finish grinding, the F5 machine frame is lightly pressed to improve the surface of strip steel, and the pressing rate is 3.5%;
(3) The continuous annealing process adopts a six-roller leveling machine, a working roller adopts a ceramic grinding wheel for finish grinding, the diameter difference of the upper machine roller and the lower machine roller of the upper working roller is 0.07mm, the roughness is 2.22/2.28 mu m, and the peak value number is 115/cm; the concentration of the leveling liquid is 3.52%, the leveling elongation is 0.80%, and the leveling force of the through plate is controlled to 2400-4000 KN;
the thickness of the final cold-rolled deep-drawing steel product is 0.80mm, the width is 1680mm, the six-point position roughness of the upper surface side, the lower surface side, the middle surface side and the side is 1.13-1.21 mu m, the peak value number is 92-101/cm, the surface has no longitudinal rolling line flaw, and the severe surface quality requirement of steel customers for outer plates is met.
Example 2
According to the conventional DC06 cold-rolled deep-drawing steel component smelting slab, the head and tail slabs are modified to obtain a steel slab with the thickness of 230mm and the width of 1850mm, the steel slab is subjected to hot continuous rolling, acid continuous rolling and continuous annealing processes to produce a finished steel coil, in the production process, parameters such as a hot continuous rolling process lubrication rolling process, a roller period and pressing down, an acid continuous rolling process roller period, surface roughness and pressing down, a continuous annealing process roller surface roughness, peak value number, roller diameter difference and through plate flattening force are controlled, and the specific steps are as follows:
(1) The hot continuous rolling process adopts seven frames for continuous rolling, F2-F6 frames are lubricated by rolling, the oil quantity of an upper discharge frame of F2-F5 is set to 20ml/min, the oil quantity of a lower discharge frame is set to 30ml/min, the oil quantity of an upper discharge frame of F6 is set to 30ml/min, and the oil quantity of a lower discharge frame is set to 35ml/min; the on-machine roughness of the F7 working roller is 0.79 mu m; f7 final frame rolling reduction is 15.9%, F7 working roll period is 32km;
(2) The acid continuous rolling process adopts five-frame continuous rolling, the upper machine roughness of the F1-F4 frame working rolls is respectively 0.85/0.83 mu m, 0.79/0.79 mu m, 0.60/0.61 mu m and 0.49/0.48 mu m, and the upper machine roughness of the F5 end frame working rolls is 3.42/3.38 mu m;
the working roll periods of F1-F5 are 808 tons, 808 tons and 522 tons respectively, the intermediate roll periods of F1-F5 are 6781 tons, 6781 tons and 6781 tons respectively, the support roll periods of F1-F3 are 66554 tons, 66554 tons and 66554 tons respectively, and the support roll periods of F4-F5 are 66554 tons and 12204 tons respectively;
the F1-F5 machine frame uses common rollers, the F5 machine frame work roller adopts a ceramic grinding wheel for finish grinding, the F5 machine frame is lightly pressed to improve the surface of strip steel, and the pressing rate is 4.0%;
(3) The continuous annealing process adopts a six-roller leveling machine, a working roller adopts a ceramic grinding wheel for finish grinding, the diameter difference of the upper machine roller and the lower machine roller of the upper working roller is 0.09mm, the roughness is 2.35/2.28 mu m, and the peak value number is 109/cm; the concentration of the leveling liquid is 2.11%, the leveling elongation is 0.50%, and the leveling force of the through plate is controlled to be 2100-3400 KN;
the thickness of the final cold-rolled deep-drawing steel product which is subjected to offline is 0.65mm, the width is 1710mm, the six-point position roughness of the upper surface side, the lower surface side, the middle surface side and the side is 0.88-0.97 mu m, the peak value number is 95-103/cm, the surface has no longitudinal rolling line flaw, and the severe surface quality requirement of steel customers for outer plates is met.
Example 3
According to the conventional DC03 cold-rolled deep-drawing steel component smelting slab, the head and tail slabs are modified to obtain a steel slab with the thickness of 230mm and the width of 1500mm, the steel slab is subjected to hot continuous rolling, acid continuous rolling and continuous annealing processes to produce a finished steel coil, in the production process, parameters such as a hot continuous rolling process lubrication rolling process, a roller period and pressing down, an acid continuous rolling process roller period, surface roughness and pressing down, a continuous annealing process roller surface roughness, peak value number, roller diameter difference and through plate flattening force are controlled, and the specific steps are as follows:
(1) The hot continuous rolling process adopts seven frames for continuous rolling, F2-F6 frames are lubricated by rolling, the oil quantity of an upper discharge frame of F2-F5 is set to 20ml/min, the oil quantity of a lower discharge frame is set to 30ml/min, the oil quantity of an upper discharge frame of F6 is set to 30ml/min, and the oil quantity of a lower discharge frame is set to 35ml/min; the on-machine roughness of the F7 working roller is 0.77 mu m; f7 final frame rolling reduction is 19.6%, F7 working roll period is 38km;
(2) The acid continuous rolling process adopts five-frame continuous rolling, the upper machine roughness of the F1-F4 frame working rolls is respectively 0.82/0.82 mu m, 0.76/0.79 mu m, 0.58/0.57 mu m, 0.48/0.49 mu m, and the upper machine roughness of the F5 end frame working rolls is 3.42/3.38 mu m;
the working roll periods of F1 to F5 are 1075 tons, 1075 tons and 1075 tons respectively, the intermediate roll periods of F1 to F5 are 9022 tons, 6220 tons and 4331 tons respectively, the supporting roll periods of F1 to F3 are 67542 tons, 67542 tons and 67542 tons respectively, and the supporting roll periods of F4 to F5 are 67542 tons respectively;
the F1-F5 machine frame uses common rollers, the F5 machine frame work roller adopts a ceramic grinding wheel for finish grinding, the F5 machine frame is lightly pressed to improve the surface of strip steel, and the pressing rate is 4.0%;
(3) The continuous annealing process adopts a six-roller leveling machine, a working roller adopts a ceramic grinding wheel for finish grinding, the diameter difference of the upper machine roller and the lower machine roller of the upper working roller is 0.05mm, the roughness is 2.21/2.32 mu m, and the peak value number is 111/cm; the concentration of the flattening liquid is 4.0%, the flattening elongation is 0.70%, and the flattening force of the through plate is controlled to be 3000-5200 KN;
the thickness of the final cold-rolled deep-drawing steel product which is subjected to offline is 0.65mm, the width is 1710mm, the six-point position roughness of the upper surface side, the lower surface side, the middle surface side and the side is 0.99-1.17 mu m, the peak value number is 88-97/cm, the surface has no longitudinal rolling line flaw, and the severe surface quality requirement of steel customers for outer plates is met.
The invention is not described in detail in the prior art, including the steps and related process parameters.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (7)
1. The control method of the surface rolling lines of the cold-rolled deep-drawing steel for the outer plate is characterized by controlling a hot continuous rolling process, an acid continuous rolling process and a continuous annealing process in the production process of the cold-rolled deep-drawing steel, and specifically comprises the following steps of:
(1) Seven frames are adopted for continuous rolling in the hot continuous rolling process, F2-F6 frames are lubricated for rolling, the oil quantity of an upper discharge frame of F2-F5 is set to 20ml/min, the oil quantity of a lower discharge frame of F6 is set to 30ml/min, and the oil quantity of a lower discharge frame of F6 is set to 35ml/min; f7 end frame rolling reduction is 13% -20%, and F7 working roll period is 10-40 km;
(2) The acid continuous rolling process adopts five-frame continuous rolling, the on-duty roughness of F1-F4 frame working rolls is 0.75-0.85 mu m, 0.55-0.65 mu m, 0.45-0.55 mu m and the on-duty roughness of F5 end frame working rolls is 3.20-3.50 mu m;
the roller period of the F1-F5 working roller is not more than 1200 tons, the roller period of the F1-F5 middle roller is not more than 10000 tons, the roller period of the F1-F3 supporting roller is not more than 90000 tons, and the roller period of the F4-F5 supporting roller is not more than 80000 tons;
f5, lightly pressing the frame to improve the surface of the strip steel, wherein the pressing rate is 3.5% -5.0%;
(3) The difference of the roller diameters of the upper working roller and the lower working roller in the continuous annealing process is not more than 0.12mm, the roughness is 2.20-2.50 mu m, and the peak value number is not less than 105/cm; the concentration of the leveling liquid is 2.0% -4.5%, the leveling elongation is 0.6% -1.0%, and the leveling force of the through plate is controlled at 2000-6000 KN.
2. The control method according to claim 1, wherein the cold-rolled deep drawing steel is of a grade selected from the group consisting of DC03, DC04 and DC06.
3. The control method according to claim 1, wherein the thickness of the billet processed in the hot continuous rolling step is 230mm and the width thereof is 1250-190 mm.
4. The control method according to claim 1, wherein the hot continuous rolling process controls the on-press roughness of the F7 work rolls to not more than 0.9 μm.
5. The control method according to claim 1, wherein the F1-F5 stand in the acid tandem rolling process uses a common roll, and the F5 end stand work roll is finish-ground by a ceramic grinding wheel.
6. The control method according to claim 1, wherein the continuous annealing process uses a six-roll temper mill, and the work roll is finish-ground with a ceramic grinding wheel.
7. The control method of claim 1, wherein the surface roughness of the final steel coil is 0.80-1.30 μm and the peak number is not less than 85/cm.
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