CN112872082B - Plate shape control method for extreme width and thickness deep-drawing galvanized steel plate - Google Patents

Plate shape control method for extreme width and thickness deep-drawing galvanized steel plate Download PDF

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CN112872082B
CN112872082B CN202110048678.7A CN202110048678A CN112872082B CN 112872082 B CN112872082 B CN 112872082B CN 202110048678 A CN202110048678 A CN 202110048678A CN 112872082 B CN112872082 B CN 112872082B
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steel plate
rolling
less
hot
equal
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CN112872082A (en
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王乐
陈晓潇
胡华东
宇凡
何召东
查凯
金光宇
丁明凯
郝亮
冯帆
殷继丽
展英姿
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SD Steel Rizhao Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a plate shape control method of a limited width and thin deep-drawing galvanized steel plate, which comprises the following steps: producing a continuous casting slab; heating, rolling at high temperature, performing front-section sparse laminar cooling, coiling the hot-rolled raw steel plate at 700-730 ℃, and air-cooling to below 65 ℃; pulling, straightening, scale breaking, acid washing and normal-temperature rolling are carried out on the obtained hot rolled steel coil raw material to obtain a cold-hardened steel coil with the wave after rolling being less than or equal to 10I-unit and the medium wave being less than or equal to 5I-unit; the cold hard steel coil is hot-dip galvanized after being continuously annealed at constant speed, temperature and tension; the finishing elongation is 1.0-1.2%. The galvanized finished product steel plate manufactured by the method has the plate thickness and width specification of (0.60-0.75) mmx (1600-1850) mm, the batch yield strength of the galvanized steel plate is stabilized at 150-175 MPa, and the transverse post-fracture elongation A80Not less than 43 percent and plastic strain ratio r90Not less than 2.70, work hardening index n90Not less than 0.230; meanwhile, the steel plate has excellent plate shape quality, the maximum wave height is less than or equal to 3mm, the acute degree is less than or equal to 1.5 percent, and the comprehensive use requirement of the steel industry for downstream high-end automobiles and household appliances can be completely met.

Description

Plate shape control method for extreme width and thickness deep-drawing galvanized steel plate
Technical Field
The invention belongs to the technical field of metal material processing, and particularly relates to a plate shape control method of a limited width and thin deep drawing galvanized steel plate.
Background
The galvanized steel sheet for deep drawing is one of the most widely applied high-end steel raw materials in the steel industry of household appliances and automobiles. For the extreme width and thin specification deep drawing galvanized steel sheet with the width of 1600mm and more and the thickness of 0.75mm and less, the steel sheet is required to have excellent stamping formability, weldability, corrosion resistance, performance stability, coating property and the like, and the sheet shape indexes of the steel sheet are also strictly regulated, such as the maximum wave height is less than or equal to 3mm and the degree of emergency is less than or equal to 1.5 percent. The product is widely used for manufacturing parts such as side walls, wheel fenders, inner and outer plates of doors and windows in the automobile industry, and is also often used for manufacturing parts such as door plates of refrigerators, back plates of televisions and the like in the household appliance industry after being cut to length.
It is known that the material of the galvanized steel sheet for deep drawing is soft (generally, the yield strength is not more than 180MPa), and the stable control of the sheet shape is one of the technical pain points of various large steel mills. For the extreme wide and thin specification deep-drawing galvanized steel plate, the control difficulty of the shape of the plate is increased by geometric times due to the fact that the width of the steel plate is larger and the thickness of the steel plate is thinner. Meanwhile, in order to ensure that galvanized steel sheet products have excellent deep drawing forming performance, a withdrawal and straightening process is not allowed to be used after continuous annealing and finishing. Therefore, how to guarantee the high plate-shaped quality of the extremely wide and thin deep-drawing galvanized steel plate under the existing mainstream process equipment condition is a problem to be solved urgently by the technology of each large steel production enterprise.
CN 105312359A discloses a method for controlling the shape of a low-temperature annealed steel strip, which only controls the annealing temperature, flattens a bending roll and the like, and applies a straightening and withdrawal process to improve the shape of the steel strip, is only suitable for producing a low-end galvanized structural steel plate by a horizontal direct-fired furnace and is completely not suitable for producing a deep-drawing galvanized steel plate by a mainstream vertical continuous annealing production line.
CN 111438189A discloses a cold-rolled sheet and a sheet shape control method thereof, the patent method only controls hot rolling process parameters and applies a hot rolling leveling process, and the method is suitable for producing high-strength galvanized steel sheets with the thickness of 2.5-4.0 mm and is completely not suitable for producing soft wide and thin cold-rolled deep-drawing galvanized steel sheets.
CN 103394521B discloses a cold-rolled strip steel plate shape control method, which is only calculated by plate shape distribution signals in a cold rolling procedure and controls the roll inclination, the working roll and the middle roll bending parameters in a feedback manner so as to improve the plate shape index of a conventional steel plate in the rolling procedure and can not meet the plate shape control requirement of a limit wide and thin specification deep drawing galvanized steel plate.
CN 105013833A discloses a plate shape control method of ultrathin specification cold-hard strip steel, which improves the plate shape by adjusting the average convexity and the final rolling temperature of a hot rolled plate in a hot rolling process and by roll shifting amount and reduction distribution in an acid rolling process, but the method is only suitable for partial cold-hard intermediate products and is not suitable for the plate shape control requirement of an extremely wide and thin specification deep drawing galvanized steel plate.
CN 103639209A discloses a method for controlling a cold-rolled plate shape of an extremely thin color-coated base material, which guarantees the plate shape by selecting the average convexity and wedge shape of a hot-rolled material, is only suitable for hot-rolling a color-coated substrate and cannot meet the plate shape control requirement of an extremely wide and thin specification deep-drawing galvanized steel plate.
Disclosure of Invention
The invention aims to provide a method for controlling the shape of a limited wide and thin deep-drawing galvanized steel sheet.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for controlling the shape of a limit wide and thin deep-drawing galvanized steel sheet comprises the following steps:
1) producing a continuous casting plate blank, and smelting to produce the continuous casting plate blank according to the design components of the deep-drawing galvanized steel plate;
2) rolling, namely conveying the obtained continuous casting plate blank to a hot continuous rolling mill group for heating, wherein the discharging temperature of a heating furnace is 1190-1230 ℃, an edge heater and a heat-preservation cover are coiled for use, the rolling period of a finishing roller is 10-40 km, and the finish rolling temperature is 900-930 ℃;
3) obtaining a hot-rolled raw steel plate, and obtaining a hot-rolled raw steel plate with the thickness of 3.0-4.0 mm, the width of 1630-1880 mm and the convexity C after rolling40At 40-70 μm, a convexity of C75At 20-40 μm, wedge-shaped W40Less than or equal to 30 mu m and C40＞W40A hot-rolled raw material steel plate with a local height point less than or equal to 13 mu m;
4) cooling, namely adopting front-section laminar sparse cooling, wherein the straightness within 10m of the head and the tail of the hot rolling raw material steel plate is less than or equal to 60I-unit, and the straightness in the middle is less than or equal to 27I-unit;
5) coiling, namely coiling the hot-rolled raw material steel plate at 700-730 ℃, and air-cooling to below 65 ℃ to obtain a hot-rolled steel coil raw material;
6) acid rolling, namely conveying the hot rolled steel coil raw material to an acid rolling unit for straightening and scale breaking, acid pickling and rolling, wherein the total reduction rate of the acid rolling is 75.0-85.0%, the reduction rate of a final stand is 3.0%, the cold and hard edge rolling wave after rolling is less than or equal to 10I-unit, and the middle wave is less than or equal to 5I-unit;
7) annealing, namely continuously annealing the cold hard coil in the step 6), controlling the running speed of a process section to be any fixed value in the range of 110-150 m/min, controlling the annealing soaking temperature to be any fixed value in the range of 780-800 ℃, controlling the slow cooling outlet temperature to be any fixed value in the range of 640-680 ℃, controlling the fast cooling outlet temperature to be any fixed value in the range of 460-490 ℃, and controlling the temperature of a zinc pot to be any fixed value in the range of 455-490 ℃; the tension of the soaking section is controlled to be any fixed value in the range of 5.0-9.0 KN, and the tension of the fast cooling section is controlled to be any fixed value in the range of 10.0-18.0 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) finishing, wherein the finishing elongation is 1.0-1.2%, and the bending roll and the inclination amount are manually adjusted to ensure that the wave shape of the steel plate is less than or equal to 6I-unit;
10) and obtaining a finished steel plate, performing fine trimming, manually confirming the shape of the steel plate, and coiling to obtain a finished steel plate.
Specifically, the thickness of the continuous casting slab is 230mm, and the width of the continuous casting slab is 1800mm, 1900mm or 2000 mm.
The invention has the following beneficial effects: by the limit width deep drawingThe shape control method of the galvanized steel sheet comprises the steps that the thickness and width of the galvanized finished product steel sheet are (0.60-0.75) mmx (1600-1850) mm, the batch yield strength of the galvanized steel sheet is stabilized at 150-175 MPa, and the transverse post-fracture elongation A80Not less than 43 percent and plastic strain ratio r90Not less than 2.70, work hardening index n90Not less than 0.230; meanwhile, the steel plate has excellent plate shape quality, the maximum wave height is less than or equal to 3mm, the acute degree is less than or equal to 1.5 percent, the comprehensive quality requirement of the downstream high-end automobile and household appliance steel industry on the extremely wide and thin specification deep-drawing galvanized steel plate can be completely met, and the economic benefit and the brand benefit are obvious.
Drawings
FIG. 1 is a schematic diagram of the shape of a galvanized steel sheet according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
The theoretical basis of the invention is as follows: on the premise of shortening the production flow and not reducing the formability, the hot rolling process does not use a flattening process, and cross section parameters of the raw materials of the hot rolled steel plate, such as the plate convexity C, are controlled by emphasis40And C75The shape of the hot rolling raw material can be optimally matched with the shape of a common working roll of a cold rolling five-stand continuous rolling mill, and the cold rolling wave shape of the wide and thin deep drawing galvanized steel plate caused by the high point stress concentration after acid rolling and coiling is avoided; the acid rolling unit ensures the total reduction rate of cold rolling through the optimized thickness of the hot rolled steel plate raw material, and improves the shape of the cold-hard plate to the maximum extent by utilizing 3% of soft reduction of an F5 final frame; the galvanizing unit reduces the stress difference in the width direction of the steel plate through stable medium-temperature soaking, stable galvanizing running speed and stable small tension production, and improves the plate shape quality of the extreme wide and thin specification deep drawing galvanized steel plate in the whole annealing and galvanizing processes; and after hot dip galvanizing, a small finishing process (without a withdrawal and straightening process) is adopted, so that the shape of the steel plate is further improved on the premise of ensuring the formability of the steel plate.
The invention relates to a plate shape control method of a limit width and thin deep drawing galvanized steel plate, which comprises the following steps:
1) smelting and producing according to the design components of the deep drawing galvanized steel plate to obtain a continuous casting plate blank with the thickness of 230mm, the width of 1800mm, or the width of 1900mm or 2000 mm;
2) conveying the continuous casting plate blank to a hot continuous rolling unit for heating, wherein the discharging temperature of a heating furnace is 1190-1230 ℃, an edge heater and a heat preservation cover are coiled and put into use, the rolling period of a finishing roller is 10-40 km, and the final rolling temperature is 900-930 ℃;
3) the thickness of the hot-rolled raw steel plate after rolling is 3.0-4.0 mm, the width is 1630-1880 mm, and the convexity C40(40 mm from the edge part of the mark point) is 40 to 70 μm, and the convexity C is75(the mark point is 75mm away from the edge part) is 20-40 mu m, and the width of the wedge-shaped W is40(40 mm from the edge part of the mark point) is less than or equal to 30 mu m, and C40＞W40(ii) a The local height point is less than or equal to 13 mu m;
4) adopting front-section laminar sparse cooling, wherein the straightness within 10m of the head and the tail of the hot rolling raw material steel plate is less than or equal to 60I-unit, and the straightness in the middle is less than or equal to 27I-unit;
5) coiling the hot rolled steel plate at 700-730 ℃, and air-cooling to below 65 ℃;
6) feeding the hot-rolled steel coil raw material into an acid rolling mill group for straightening, descaling, pickling and rolling, wherein the total reduction rate of acid rolling is 75.0-85.0%, the reduction rate of a final stand is 3.0%, the cold and hard edge rolling wave after rolling is less than or equal to 10I-unit, and the middle wave is less than or equal to 5I-unit;
7) continuously annealing the cold hard coil, controlling the operation speed of a process section at any fixed value of 110-150 m/min, controlling the annealing soaking temperature at any fixed value of 780-800 ℃, controlling the slow cooling outlet temperature at any fixed value of 640-680 ℃, controlling the fast cooling outlet temperature at any fixed value of 460-490 ℃, and controlling the temperature of a zinc pot at any fixed value of 455-490 ℃; the tension of the soaking section is controlled to be any fixed value in the range of 5.0-9.0 KN, and the tension of the fast cooling section is controlled to be any fixed value in the range of 10.0-18.0 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) polishing, wherein the elongation of polishing is 1.0-1.2%; manually adjusting the bending roller and the inclination amount to ensure that the wave shape of the steel plate is less than or equal to 6I-unit;
10) and (4) finishing trimming, manually confirming the shape of the plate, and coiling to obtain a target steel plate finished product.
The present invention will be further described with reference to the following specific examples.
Example 1
The smelting components of the conventional IF steel are adopted: 0.0025 wt% of C, 0.13 wt% of Mn, 0.005 wt% of Si, 0.008 wt% of P, 0.005 wt% of S, 0.034 wt% of ais, 0.0029 wt% of N, 0.066 wt% of Ti, and the balance of Fe and other residual trace elements. The thickness of the cold-rolled finished steel plate is 0.60mm, and the width is 1600 mm; the yield strength is 168MPa, and the transverse elongation after fracture A8045.8%, plastic strain ratio r902.981, work hardening index n90The thickness is 0.241, the steel plate has excellent plate shape quality, the maximum wave height is 2.5mm, the degree of urgency is 1.0 percent, and the quality requirements of downstream high-end household appliances and automobile steel customers are met.
The production procedure of example 1 is as follows:
1) smelting and producing according to the design components of the deep drawing galvanized steel sheet to obtain a continuous casting plate blank with the thickness of 230mm and the width of 1800 mm;
2) conveying the continuous casting plate blank to a hot continuous rolling unit for heating, wherein the tapping temperature of a heating furnace is 1199 ℃, an edge heater and a heat-preservation cover are coiled and used, the rolling period of a finishing roller is 22km, and the finish rolling temperature is 911 ℃;
3) the hot rolled raw steel plate after rolling has the thickness of 3.0mm, the width of 1636mm and the convexity C40(40 mm from the edge of the mark point) was 52 μm in convexity C75(marker point 75mm from edge) at 24 μm, wedge-shaped W40(40 mm from the edge of the mark point) is less than or equal to 27 mu m, and C40＞W40(ii) a Local high points 12 μm;
4) adopting front-section laminar sparse cooling, wherein the straightness within 10m of the head and the tail of the hot rolling raw material steel plate is less than or equal to 60I-unit, and the straightness in the middle is less than or equal to 21I-unit;
5) coiling the hot rolled steel plate at 712 ℃, and air-cooling to 65 ℃ or below;
6) feeding the hot-rolled steel coil raw material into an acid rolling mill group for straightening, descaling, pickling and rolling, wherein the total reduction rate of acid rolling is 80.0%, the reduction rate of a final stand is 3.0%, the cold-hard edge wave after rolling is less than or equal to 7I-unit, and the middle wave is less than or equal to 4I-unit;
7) continuously annealing the cold hard coil, wherein the operation speed of a process section is 148m/min, the annealing soaking temperature is 798 ℃, the slow cooling outlet temperature is 662 ℃, the fast cooling outlet temperature is 480 ℃, and the zinc pot temperature is 472 ℃; the tension of the soaking section is 5.7KN, and the tension of the fast cooling section is 12.2 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) polishing, wherein the elongation of polishing is 1.0%; the bending roll and the inclination amount are manually adjusted, and the wave shape of the steel plate is less than or equal to 5I-unit;
10) and (4) finishing trimming, manually confirming the shape of the plate, and coiling to obtain a target steel plate finished product.
Example 2
The smelting components of the conventional IF steel are adopted: 0.0015 wt% of C, 0.15 wt% of Mn, 0.004 wt% of Si, 0.006 wt% of P, 0.007 wt% of S, 0.035 wt% of Als, 0.0030 wt% of N, 0.068 wt% of Ti, and the balance of Fe and other residual trace elements. The thickness of the cold-rolled finished steel plate is 0.75mm, and the width is 1820 mm; yield strength of 164MPa and transverse elongation A after fracture8046.7% and a plastic strain ratio r90Is 2.887, work hardening index n900.239, the steel plate has excellent plate shape quality, the maximum wave height is 2.8mm, and the degree of urgency is 1.35%, so that the steel plate meets the quality requirements of downstream high-end household appliances and automobile steel customers.
The production procedure of example 2 was as follows:
1) smelting and producing according to the design components of the deep-drawing galvanized steel sheet to obtain a continuous casting slab with the thickness of 230mm and the width of 2000 mm;
2) conveying the continuous casting plate blank to a hot continuous rolling mill group for heating, wherein the tapping temperature of a heating furnace is 1212 ℃, an edge heater and a heat-preservation cover are put into use by rolling, the rolling period of a finishing roller is 31km, and the finish rolling temperature is 905 ℃;
3) the hot-rolled raw steel plate after rolling has the thickness of 4.0mm, the width of 1852mm and the convexity C40(40 mm from the edge of the mark point) at 47 μm, a convexity C75(marker point 75mm from edge) 26 μm, wedge-shaped W40(40 mm from the edge of the mark point) is less than or equal to 26 μm, and C40＞W40(ii) a Local high points 13 μm;
4) adopting front-section laminar sparse cooling, wherein the straightness within 10m of the head and the tail of the hot rolling raw material steel plate is less than or equal to 60I-unit, and the straightness in the middle is less than or equal to 24I-unit;
5) coiling the hot rolled steel plate at 709 ℃, and air-cooling to below 65 ℃;
6) feeding the hot-rolled steel coil raw material into an acid rolling mill group for straightening, descaling, pickling and rolling, wherein the total reduction rate of acid rolling is 81.3%, the reduction rate of a final stand is 3.0%, the cold-hard edge wave after rolling is less than or equal to 7I-unit, and the middle wave is less than or equal to 5I-unit;
7) continuously annealing the cold hard coil, wherein the operation speed of a process section is 132m/min, the annealing soaking temperature is 782 ℃, the slow cooling outlet temperature is 651 ℃, the fast cooling outlet temperature is 478 ℃, and the temperature of the cold hard coil in a zinc pot is 465 ℃; the tension of the soaking section is 8.8KN, and the tension of the fast cooling section is 17.6 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) polishing, wherein the polishing elongation is 1.2%; the bending roll and the inclination amount are manually adjusted, and the wave shape of the steel plate is less than or equal to 6I-unit;
10) and (4) finishing trimming, manually confirming the shape of the plate, and coiling to obtain a target steel plate finished product.
Example 3
The smelting components of the conventional IF steel are adopted: 0.0018 wt% of C, 0.15 wt% of Mn, 0.003 wt% of Si, 0.009 wt% of P, 0.006 wt% of S, 0.038 wt% of Als, 0.0033 wt% of N, 0.062 wt% of Ti, and the balance of Fe and other residual trace elements. The thickness of the cold-rolled finished steel plate is 0.70mm, and the width is 1750 mm; the yield strength is 156MPa, and the transverse elongation after fracture A8047.0%, plastic strain ratio r90Is 3.004, work hardening index n900.245, the steel plate has excellent plate-shaped quality, the maximum wave height is 1.8mm, the degree of urgency is 1.05 percent, and the quality requirements of downstream high-end household appliances and automobile steel customers are met.
The production procedure for example 3 was as follows:
1) smelting and producing according to the design components of the deep-drawing galvanized steel plate to obtain a continuous casting plate blank with the thickness of 230mm and the width of 1900 mm;
2) conveying the continuous casting plate blank to a hot continuous rolling mill group for heating, wherein the tapping temperature of a heating furnace is 1220 ℃, an edge heater and a heat-preservation cover are put into use by coiling, the rolling period of a finishing roller is 26km, and the final rolling temperature is 917 ℃;
3) the hot rolled raw steel plate after rolling has the thickness of 3.5mm, the width of 1788mm and the convexity C40(sign point off edge part40mm) at 44 μm, a convexity C75(marker point 75mm from edge) at 29 μm, wedge-shaped W40(40 mm from the edge of the mark point) is less than or equal to 18 mu m, and C40＞W40(ii) a Local high points 12 μm;
4) adopting front-section laminar sparse cooling, wherein the straightness of the hot rolling raw material steel plate within 10m of the head and the tail is less than or equal to 60I-unit, and the straightness of the middle part is less than or equal to 20I-unit;
5) coiling the hot rolled steel plate at 725 ℃, and air-cooling to below 65 ℃;
6) feeding the hot-rolled steel coil raw material into an acid rolling mill group for straightening, descaling, pickling and rolling, wherein the total reduction rate of acid rolling is 80.0%, the reduction rate of a final stand is 3.0%, the cold-hard edge wave after rolling is less than or equal to 6I-unit, and the middle wave is less than or equal to 4I-unit;
7) continuously annealing the cold hard coil, wherein the running speed of a process section is 133m/min, the annealing soaking temperature is 792 ℃, the slow cooling outlet temperature is 664 ℃, the fast cooling outlet temperature is 469 ℃, and the temperature of the cold hard coil entering a zinc pot is 458 ℃; the tension of the soaking section is 7.3KN, and the tension of the fast cooling section is 15.6 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) polishing, wherein the polishing elongation is 1.1%; the bending roll and the inclination amount are manually adjusted, and the wave shape of the steel plate is less than or equal to 5I-unit;
10) and (4) finishing trimming, manually confirming the shape of the plate, and coiling to obtain a target steel plate finished product.
Comparative example (this comparative example is an example of the experimental stage, the parameters are beyond the standard of the present invention, and the produced galvanized steel sheet can not meet the quality requirements of downstream high-end household appliances and steel customers for automobiles):
the smelting components of the conventional IF steel (the same furnace steel and the same specification as those of the example 3) are adopted: 0.0018 wt% of C, 0.15 wt% of Mn, 0.003 wt% of Si, 0.009 wt% of P, 0.006 wt% of S, 0.038 wt% of Als, 0.0033 wt% of N, 0.062 wt% of Ti, and the balance of Fe and other residual trace elements. The thickness of the cold-rolled finished steel plate is 0.70mm, and the width is 1750 mm; yield strength of 157MPa and transverse elongation A after fracture8047.8%, plastic strain ratio r902.972, work hardening index n900.239, the galvanized finished steel plate has poor plate shape quality, the maximum wave height of the galvanized finished steel plate is 6.2mm,The degree of urgency is 7.4 percent, and the quality requirements of downstream high-end household appliances and automobile steel customers cannot be met.
The production procedure for the comparative example is as follows:
1) smelting and producing according to the design components of the deep-drawing galvanized steel plate to obtain a continuous casting plate blank with the thickness of 230mm and the width of 1900 mm;
2) conveying the continuous casting plate blank to a hot continuous rolling unit for heating, wherein the tapping temperature of a heating furnace is 1227 ℃, an edge heater and a heat-preservation cover are put into use by coiling, the rolling period of a finishing roller is 57km, and the finish rolling temperature is 918 ℃;
3) the hot rolled raw steel plate after rolling has the thickness of 3.5mm, the width of 1788mm and the convexity C40(40 mm from the edge of the mark point) at 32 μm and a convexity C75(marker point 75mm from edge) at 17 μm, wedge-shaped W40(40 mm from the edge of the mark point) is less than or equal to 38 mu m, and C40＜W40(ii) a Local high points 25 μm;
4) adopting front-section laminar sparse cooling, wherein the straightness within 10m of the head and the tail of the hot rolling raw material steel plate is less than or equal to 60I-unit, and the straightness in the middle is less than or equal to 23I-unit;
5) coiling the hot rolled steel plate at 715 ℃, and air-cooling to below 65 ℃;
6) feeding the hot-rolled steel coil raw material into an acid rolling mill group for straightening, descaling, pickling and rolling, wherein the total reduction rate of acid rolling is 80.0%, the reduction rate of a final stand is 3.0%, the cold-hard edge wave after rolling is less than or equal to 6I-unit, and the middle wave is less than or equal to 4I-unit;
7) continuously annealing the cold-hard coil, wherein the operation speed of a process section is 135m/min, the annealing soaking temperature is 795 ℃, the slow cooling outlet temperature is 663 ℃, the fast cooling outlet temperature is 477 ℃, and the temperature of the cold-hard coil entering a zinc pot is 468 ℃; the tension of the soaking section is 7.4KN, and the tension of the fast cooling section is 15.6 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) polishing, wherein the polishing elongation is 1.1%; the bending roll and the inclination amount are manually adjusted, and the wave shape of the steel plate is less than or equal to 12I-unit;
10) and (5) finishing trimming, manually confirming the shape of the plate, and coiling to obtain a finished steel plate.
FIG. 1 is a schematic diagram showing the shape of a galvanized steel sheet according to an embodiment of the present invention, wherein Lv is the wave length, Rv is the wave height, and the severity is (Rv/Lv). times.100%.
The ordered zinc layer thickness is defined as a thickness of zinc layer which is specified by a customer when the customer places an order, and the steel mill produces and delivers the zinc layer with a thickness not less than the specified thickness.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims (2)

1. A method for controlling the shape of a limit wide and thin deep-drawing galvanized steel sheet is characterized by comprising the following steps:
1) producing a continuous casting plate blank, and smelting to produce the continuous casting plate blank according to the design components of the deep-drawing galvanized steel plate;
2) rolling, namely conveying the obtained continuous casting plate blank to a hot continuous rolling mill group for heating, wherein the discharging temperature of a heating furnace is 1190-1230 ℃, an edge heater and a heat-preservation cover are coiled for use, the rolling period of a finishing roller is 10-40 km, and the finish rolling temperature is 900-930 ℃;
3) obtaining a hot-rolled raw steel plate, and obtaining a hot-rolled raw steel plate with the thickness of 3.0-4.0 mm, the width of 1630-1880 mm and the convexity C after rolling40At 40-70 μm, a convexity of C75At 20-40 μm, wedge-shaped W40Less than or equal to 30 mu m and C40＞W40A hot-rolled raw material steel plate with a local height point less than or equal to 13 mu m;
4) cooling, namely adopting front-section laminar sparse cooling, wherein the straightness within 10m of the head and the tail of the hot rolling raw material steel plate is less than or equal to 60I-unit, and the straightness in the middle is less than or equal to 27I-unit;
5) coiling, namely coiling the hot-rolled raw material steel plate at 700-730 ℃, and air-cooling to below 65 ℃ to obtain a hot-rolled steel coil raw material;
6) acid rolling, namely conveying the hot rolled steel coil raw material to an acid rolling unit for straightening and scale breaking, acid pickling and rolling, wherein the total reduction rate of the acid rolling is 75.0-85.0%, the reduction rate of a final stand is 3.0%, the cold and hard edge rolling wave after rolling is less than or equal to 10I-unit, and the middle wave is less than or equal to 5I-unit;
7) annealing, namely continuously annealing the cold hard coil in the step 6), controlling the running speed of a process section to be any fixed value in the range of 110-150 m/min, controlling the annealing soaking temperature to be any fixed value in the range of 780-800 ℃, controlling the slow cooling outlet temperature to be any fixed value in the range of 640-680 ℃, controlling the fast cooling outlet temperature to be any fixed value in the range of 460-490 ℃, and controlling the temperature of a zinc pot to be any fixed value in the range of 455-490 ℃; the tension of the soaking section is controlled to be any fixed value in the range of 5.0-9.0 KN, and the tension of the fast cooling section is controlled to be any fixed value in the range of 10.0-18.0 KN;
8) hot dip galvanizing, wherein the thickness of a zinc layer in the width direction is controlled to be 101-103% of the thickness of a zinc layer in an order;
9) finishing, wherein the finishing elongation is 1.0-1.2%, and the bending roll and the inclination amount are manually adjusted to ensure that the wave shape of the steel plate is less than or equal to 6I-unit;
10) and obtaining a finished steel plate, performing fine trimming, manually confirming the shape of the steel plate, and coiling to obtain a finished steel plate.
2. The method for controlling a plate shape of an extreme width thin deep drawn galvanized steel plate according to claim 1, wherein the continuous cast slab has a thickness of 230mm, a width of 1800mm or 1900mm or 2000 mm.
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