CN116656924A - Acid pickling annealed plate and preparation method thereof - Google Patents

Acid pickling annealed plate and preparation method thereof Download PDF

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Publication number
CN116656924A
CN116656924A CN202310505934.XA CN202310505934A CN116656924A CN 116656924 A CN116656924 A CN 116656924A CN 202310505934 A CN202310505934 A CN 202310505934A CN 116656924 A CN116656924 A CN 116656924A
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China
Prior art keywords
rolling
temperature
hot rolled
plate
pickling
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Pending
Application number
CN202310505934.XA
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Chinese (zh)
Inventor
李生存
梁江涛
王浩宇
缪成亮
张郢
周邵轩
田贵昌
蒋小刚
潘云龙
王梅林
闫宏杰
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Shougang Group Co Ltd
Shougang Jingtang United Iron and Steel Co Ltd
Original Assignee
Shougang Group Co Ltd
Shougang Jingtang United Iron and Steel Co Ltd
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Application filed by Shougang Group Co Ltd, Shougang Jingtang United Iron and Steel Co Ltd filed Critical Shougang Group Co Ltd
Priority to CN202310505934.XA priority Critical patent/CN116656924A/en
Publication of CN116656924A publication Critical patent/CN116656924A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • C21D8/0226—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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The application relates to the technical field of acid washing plate back cover retreating production, in particular to an acid washing annealed plate and a preparation method thereof. The method comprises the following steps: heating the slab so that the slab has a target temperature; rolling the heated plate blank, and controlling the rolling process parameters to obtain a hot rolled plate; coiling the hot rolled plate under the condition of a first set temperature to obtain hot rolled strip steel; pickling the hot rolled strip steel; wherein the acid washing comprises tension straightening and the elongation of the tension straightening is controlled; and (3) carrying out hood annealing on the hot rolled strip steel subjected to pickling under the condition of a second set temperature to obtain a pickling annealed plate. The application solves the technical problem of higher manufacturing cost of the existing steel for the automobile.

Description

Acid pickling annealed plate and preparation method thereof
Technical Field
The application relates to the technical field of acid washing plate back cover retreating production, in particular to an acid washing annealed plate and a preparation method thereof.
Background
Along with the continuous enhancement of the awareness of energy conservation and natural resources at present, the weight is required to be reduced in the automobile manufacturing process, and the raw materials are saved.
At present, the manufacturing cost of the cold-rolled automobile sheet is increased, and the raw material cost is high.
Disclosure of Invention
The application provides an acid-washing annealed plate and a preparation method thereof, which aim to solve the technical problem of higher manufacturing cost of the existing steel for automobiles.
In a first aspect, the present application provides a method for producing a pickling annealed sheet, the method comprising:
heating the slab having the set chemical composition so that the slab has a target temperature;
rolling the heated plate blank, and controlling the rolling technological parameters to obtain a hot rolled plate;
coiling the hot rolled plate under the condition of a first set temperature to obtain hot rolled strip steel;
pickling the hot rolled strip steel; wherein the acid washing comprises tension straightening and the elongation of the tension straightening is controlled;
and (3) carrying out hood annealing on the pickled hot rolled strip steel under the condition of a second set temperature to obtain an acid-pickled annealed plate.
Optionally, the rolling the heated slab and controlling the rolling process parameters to obtain a hot rolled plate includes:
under the condition of a first set rolling outlet temperature, rough rolling is carried out on the heated slab;
and performing finish rolling on the plate blank after rough rolling under the condition of a second set rolling outlet temperature to obtain a hot rolled plate.
Optionally, the first set rolling outlet temperature is 1060 ℃ -1100 ℃.
Optionally, the second set rolling outlet temperature is 840 ℃ to 880 ℃.
Optionally, performing finish rolling on the rough rolled plate blank under the condition of a second set rolling outlet temperature to obtain a hot rolled plate; comprising the following steps:
performing finish rolling on the rough rolled plate blank under the conditions of a first set rolling inlet temperature and a second set rolling outlet temperature to obtain a hot rolled plate; the first set rolling inlet temperature is 1040-1080 ℃.
Alternatively, the target temperature is 1210 ℃ to 1250 ℃.
Optionally, the first set temperature is 600 ℃ to 640 ℃.
Optionally, the elongation of the withdrawal and straightening is 0.3% -0.6%.
Optionally, the second set temperature is 690 ℃ to 720 ℃.
In a second aspect, the application provides a pickling annealed sheet, which is prepared by the method according to any embodiment of the first aspect, wherein the thickness of an inter-crystalline oxide layer of the pickling annealed sheet is less than or equal to 25 μm, and the vickers hardness value HV10 of the pickling annealed sheet is 160-180.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the preparation method of the pickling annealed plate provided by the embodiment of the application controls the tapping temperature of the plate blank, and aims to: the energy consumption of the heating furnace is reduced, and the temperature of the slab is controlled within a controllable range so as to ensure the stable quality of the slab; controlling the rolling process parameters, wherein the purpose is to stabilize the grain size and rolling force in the steel plate so as to obtain the steel plate with good surface quality; controlling coiling temperature to obtain a steel plate with finer structure; controlling the elongation of the tension leveler to improve the plate shape; the temperature of the hood-type annealing is controlled for the purpose of: residual stress is reduced, tissue and component homogenization is improved, and tissue preparation is performed for subsequent heat treatment. In conclusion, the annealed plate is obtained by directly annealing after being treated by the pickling line, and the cold rolling process is not needed, so that the annealed plate is used on the hollow stabilizer bar of the automobile, the use surface of the pickled plate is improved, the production cost is reduced, and the technical problem that the manufacturing cost of the existing steel for the automobile is high is finally solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for preparing an acid-washed annealed sheet according to an embodiment of the present application;
FIG. 2 is a microstructure of a pickling annealed sheet according to example 1 of the present application;
FIG. 3 is a microstructure of an annealed, pickled plate according to comparative example 1 of the present application;
FIG. 4 is a microstructure of a pickled plate according to comparative example 3;
FIG. 5 is an intergranular oxidation diagram of a pickling annealed sheet provided in example 1 of the present application;
FIG. 6 is an intergranular oxidation diagram of an annealed pickled plate according to comparative example 1 of the present application;
fig. 7 is an intergranular oxidation diagram of a pickled plate according to comparative example 3 of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides a method for preparing an acid-washed annealed sheet, referring to fig. 1, the method includes:
s1, heating a slab with a set chemical composition so that the slab has a target temperature;
s2, rolling the heated plate blank, and controlling the rolling process parameters to obtain a hot rolled plate;
s3, coiling the hot rolled plate under the condition of a first set temperature to obtain hot rolled strip steel;
s4, pickling the hot rolled strip steel; wherein the acid washing comprises tension straightening and the elongation of the tension straightening is controlled;
s5, carrying out hood annealing on the hot rolled strip steel subjected to pickling under the condition of a second set temperature to obtain a pickling annealed plate.
The preparation method of the pickling annealed plate provided by the embodiment of the application controls the tapping temperature of the plate blank, and aims to: the energy consumption of the heating furnace is reduced, and the temperature of the slab is controlled within a controllable range so as to ensure the stable quality of the slab; controlling the rolling process parameters, wherein the purpose is to stabilize the grain size and rolling force in the steel plate so as to obtain the steel plate with good surface quality; controlling coiling temperature to obtain a steel plate with finer structure; controlling the elongation of the tension leveler to improve the plate shape; the temperature of the hood-type annealing is controlled for the purpose of: residual stress is reduced, tissue and component homogenization is improved, and tissue preparation is performed for subsequent heat treatment. In conclusion, the annealed plate is obtained by directly annealing after being treated by the pickling line, and the cold rolling process is not needed, so that the annealed plate is used on the hollow stabilizer bar of the automobile, the use surface of the pickled plate is improved, the production cost is reduced, and the technical problem that the manufacturing cost of the existing steel for the automobile is high is finally solved.
In some embodiments, the rolling the heated slab and controlling the process parameters of the rolling to obtain a hot rolled plate comprises:
under the condition of a first set rolling outlet temperature, rough rolling is carried out on the heated slab;
and performing finish rolling on the plate blank after rough rolling under the condition of a second set rolling outlet temperature to obtain a hot rolled plate.
The "first set rolling outlet temperature" means the outlet temperature of the rough rolling, and the "second set rolling outlet temperature" means the outlet temperature of the finish rolling
In some embodiments, the first set rolling outlet temperature is 1060 ℃ -1100 ℃.
The "first set rolling outlet temperature" means the positive effect of controlling the outlet temperature of the rough rolling to 1060 ℃ -1100 ℃ by the rough rolling outlet temperature: the thickness of the oxide scale is reduced, so that a suitable structure is obtained, and the finish rolling load is reduced. If the temperature is too high, thicker iron scales can be easily formed to a certain extent, and the control of the iron scales by finish rolling is not facilitated; if the temperature is too low, the finish rolling is not performed to some extent, which is disadvantageous for finish rolling. Specifically, the outlet temperature of the rough rolling may be 1060 ℃, 1070 ℃, 1080 ℃, 1090 ℃, 1100 ℃, or the like.
In some embodiments, the second set rolling outlet temperature is 840 ℃ to 880 ℃.
"second set rolling outlet temperature" means finish rolling outlet temperature, and the positive effect of controlling the finish rolling outlet temperature to 840-880 ℃: the finish rolling is facilitated to reduce the load, the tissue with uniform grain size is obtained, and the residual stress is reduced. If the temperature is too high, grains become coarse to some extent, and yield is relatively lowered; if the temperature is too low, the recovery recrystallization process is imperfect to a certain extent, the residual stress is large, and the plasticity index is affected; meanwhile, the load of the rolling mill also becomes larger, and the rolling is more unstable. Specifically, the outlet temperature of the finish rolling may be 840 ℃, 850 ℃, 860 ℃, 870 ℃, 880 ℃ or the like.
In some embodiments, the rough rolled slab is finish rolled under the condition of a second set rolling outlet temperature to obtain a hot rolled plate; comprising the following steps:
under the condition of first set rolling inlet temperature and second set rolling outlet temperature, the plate after rough rolling is subjected to
Performing finish rolling on the blank to obtain a hot rolled plate; the first set rolling inlet temperature is 1040-1080 ℃.
In the embodiment of the application, the first set rolling inlet temperature represents the finish rolling inlet temperature, and the positive effect of controlling the finish rolling inlet temperature to 1040-1080 ℃ is that: the rolling load of finish rolling is reduced to obtain a hot rolled strip having a thinner thickness. If the temperature of the finish rolling inlet is too low, the finish rolling load is possibly too high, the rolling force is too high, and the thin hot rolled strip steel cannot be obtained; if the finish rolling inlet temperature is too high, the surface damage to the finish rolling working roller is serious, the generation of oxide scales on the surface of strip steel is accelerated, pits caused by the pressing of the oxide scales appear after the pickling is smooth, and the surface quality of the pickling plate is affected. Specifically, the finish rolling inlet temperature may be 1040 ℃, 1050 ℃, 1060 ℃, 1070 ℃, 1080 ℃, etc.
In some embodiments, the target temperature is 1210 ℃ to 1250 ℃.
Heating the slab in a heating furnace, wherein the 'target temperature' represents the tapping temperature of the slab, and the positive effect of controlling the tapping temperature of the slab to be 1210-1250 ℃: the energy consumption of the heating furnace is reduced, and the temperature of the slab is controlled within a controllable range, so that the quality stability of the slab is ensured. If the temperature is too high, the energy consumption is increased to a certain extent, and the structure is coarse; if the temperature is too low, the subsequent rolling load is increased to some extent, which is unfavorable for the change of the structure. Specifically, the heating temperature may be 1210 ℃, 1220 ℃, 1230 ℃, 1240 ℃, 1250 ℃, etc.
In some embodiments, the first set temperature is 600 ℃ to 640 ℃.
The "first set temperature" means a coiling temperature, and has the positive effect of controlling the coiling temperature of the hot rolled plate to 600-640 ℃: the intensity of the strip steel is controlled to be moderate, and corresponding tissues are obtained. If the temperature is too high, the structure is thicker under the condition that the finish rolling outlet temperature is certain to a certain extent; if the temperature is too low, the texture is relatively thin to some extent when the finish rolling outlet temperature is constant. Specifically, the winding temperature may be 600 ℃, 610 ℃, 620 ℃, 630 ℃, 640 ℃, or the like.
In some embodiments, the elongation of the withdrawal string is from 0.3% to 0.6%.
The positive effect of controlling the elongation of the tension leveler to be 0.3% -0.6%: ensuring that the pickling plate has good extensibility. If the temperature is too high, the elongation of the pickling plate can be reduced to a certain extent; if the temperature is too low, the plate shape can not be improved to a certain extent, the surface iron oxide scale can not be broken well, and the surface iron oxide scale removal is affected. In the embodiment of the application, the scale breaking tension leveler adopts a constant elongation mode. Specifically, the elongation of the withdrawal may be 0.3%, 0.4%, 0.5%, 0.6%, etc.
In some embodiments, the second set temperature is 690 ℃ to 720 ℃.
"second set temperature" means the temperature of the hood-type annealing, and the positive effect of controlling the temperature of the hood-type annealing to 690 ℃ -720 ℃: residual stress is reduced, tissue and component homogenization is improved, and tissue preparation is performed for subsequent heat treatment. If the temperature is too high, coarse tissues can be caused to a certain extent; if the temperature is too low, residual stress cannot be eliminated to some extent, and the tissue cannot be recrystallized. Specifically, the temperature of the cap annealing may be 690 ℃, 700 ℃, 710 ℃, 720 ℃, etc., wherein the incubation time of the annealing is 19h-23h.
In a second aspect, the present application provides a pickling annealed sheet, which is produced by the method according to any one of the embodiments of the first aspect, and has an intergranular oxide layer thickness of 25 μm or less, and referring to fig. 5, the pickling annealed sheet has a vickers hardness value HV10 of 160-180.
The inter-crystal oxide layer thickness of the pickling annealed plate is less than or equal to 25 mu m, and has the positive effects that: controlling surface oxidation corrosion to avoid forming cracks; if the thickness of the inter-crystalline oxide layer is too large, the surface strength is reduced to a certain extent, and cracking and oxidation corrosion are easy to cause. Specifically, the thickness of the intergranular oxide layer may be 25 μm, 24 μm, 23 μm, etc.
In the embodiment of the application, the acid-washed annealed plate comprises the following chemical components: C. s, mn, P, S, cr, ti, N and Fe; wherein, the content of C is 0.32 to 0.37 weight percent, the content of Si is 0.2 to 0.6 weight percent, the content of Mn is 1.0 to 1.7 weight percent, the content of P is less than or equal to 0.03 weight percent, the content of S is less than or equal to 0.012 weight percent, the content of Cr is 0.1 to 0.5 weight percent, the content of Ti is 0.01 to 0.07 weight percent, and the content of N is less than or equal to 0.006 weight percent. The thickness of the annealing plate is 3 mm-7 mm.
The Vickers hardness value HV10 of the acid-washed annealed plate is 160-180: is easy to process and has moderate processing deformation resistance and destruction resistance.
The pickling annealed plate is realized based on the preparation method of the pickling annealed plate, and specific steps of the preparation method of the pickling annealed plate can refer to the embodiment, and because the pickling annealed plate adopts part or all of the technical schemes of the embodiment, the pickling annealed plate has at least all the beneficial effects brought by the technical schemes of the embodiment, and the details are not repeated here.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Examples 1 to 4 are examples of the present application, and the steps of hot rolling, pickling and hood-annealing are performed; comparative examples 1-2 are conventional hot rolling, hood annealing, pickling processes; comparative examples 3-4 hot rolling→pickling. For specific process parameters, see tables 1-3.
TABLE 1 chemical composition (wt%) of acid-washed annealed sheet
Table 2 process parameters for preparing acid-washed annealed panels
TABLE 3 Process parameters for pickling
TABLE 4 Performance results of acid washed annealed panels
As can be seen from the contents of Table 4, examples 1 to 6 obtained annealed plates having yield strengths of 352 to 386MPa, tensile strengths of 586 to 614MPa, and elongations of 32 to 33.5%; the acid washing plate provided by the comparative examples 1-2 has the yield strength of 329.5-331.7MPa, the tensile strength of 534.6-544.5MPa and the elongation of 33.5-34%, and has good surface quality, poor surface intergranular oxidation control compared with the examples 1-6, and higher hardness, and is not beneficial to processing. The acid-washed plate provided in comparative examples 3-4 has a yield strength of 407.6-408MPa, a tensile strength of 694.1-697.5MPa, and an elongation of 28.5-30%. Examples 1-6 hot rolling, pickling, and annealing process mechanical properties are higher than those of comparative examples 1-2 hot rolling, annealing, pickling mechanical properties, and the yield strength and tensile strength are both high, and the elongation is slightly lower; examples 1-6 hot rolling, pickling, and annealing process mechanical properties are lower than those of comparative examples 3-4 hot rolling, pickling mechanical properties, and the yield strength and tensile strength are both low, and the elongation is slightly higher; the examples 1-6 have good processing performance, and scale is removed after pickling, so that the cover annealing furnace is kept clean.
As can be seen from fig. 2 to 4, the examples and comparative examples of the present application provide a microstructure of ferrite + pearlite, and a macroscopic appearance of a band-like structure. As can be seen from fig. 5 to 7, the examples of the present application and the comparative examples show inter-crystal oxidation pictures.
As can be seen from Table 4, the hardness of the examples of the present application is 168-176, the hardness of the comparative examples is 171-181, the hardness of the comparative examples is 3-4, and the hardness of the examples of the present application is 196-230, which is slightly lower than the hardness of the comparative examples, thus facilitating the processing.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method of producing an acid-washed annealed sheet, the method comprising:
heating the slab so that the slab has a target temperature;
rolling the heated plate blank, and controlling the rolling technological parameters to obtain a hot rolled plate;
coiling the hot rolled plate under the condition of a first set temperature to obtain hot rolled strip steel;
pickling the hot rolled strip steel; wherein the acid washing comprises tension straightening and the elongation of the tension straightening is controlled;
and (3) carrying out hood annealing on the pickled hot rolled strip steel under the condition of a second set temperature to obtain an acid-pickled annealed plate.
2. The method according to claim 1, wherein said rolling said heated slab and controlling the process parameters of said rolling to obtain a hot rolled sheet comprises:
under the condition of a first set rolling outlet temperature, rough rolling is carried out on the heated slab;
and performing finish rolling on the plate blank after rough rolling under the condition of a second set rolling outlet temperature to obtain a hot rolled plate.
3. The method of claim 2, wherein the first set rolling outlet temperature is 1060 ℃ -1100 ℃.
4. The method of claim 2, wherein the second set rolling outlet temperature is 840-880 ℃.
5. The method according to claim 2 or 4, wherein the rough rolled slab is finish rolled under the condition of a second set rolling outlet temperature to obtain a hot rolled plate; comprising the following steps:
performing finish rolling on the rough rolled plate blank under the conditions of a first set rolling inlet temperature and a second set rolling outlet temperature to obtain a hot rolled plate; the first set rolling inlet temperature is 1040-1080 ℃.
6. The method of claim 1, wherein the target temperature is 1210 ℃ to 1250 ℃.
7. The method of claim 1, wherein the first set temperature is 600 ℃ to 640 ℃.
8. The method of claim 1, wherein the elongation of the withdrawal string is from 0.3% to 0.6%.
9. The method of claim 1, wherein the second set temperature is 690 ℃ -720 ℃.
10. A pickling annealed sheet, characterized in that it is produced by the method according to any one of claims 1 to 9, the thickness of the intergranular oxide layer of which is less than or equal to 25 μm, and the vickers hardness value HV10 of which is 160 to 180.
CN202310505934.XA 2023-05-08 2023-05-08 Acid pickling annealed plate and preparation method thereof Pending CN116656924A (en)

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