CN113145654A - Method for reducing surface corrosion incidence of hot-forming pickled steel plate - Google Patents
Method for reducing surface corrosion incidence of hot-forming pickled steel plate Download PDFInfo
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 10
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- 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
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- 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
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- 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
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- 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
- B21B37/46—Roll speed or drive motor control
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- 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
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- 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
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0272—Cleaning compositions
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- 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
- B21B2001/225—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 by hot-rolling
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- 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
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- 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
- B21B2015/0071—Levelling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B2265/10—Compression, e.g. longitudinal compression
Abstract
The embodiment of the invention discloses a method for reducing the occurrence rate of corrosion on the surface of a hot-forming pickled steel plate, which comprises the following steps: heating the steel casting blank for hot forming for less than or equal to 280min before rolling at the temperature of less than or equal to 1290 ℃ to obtain a hot plate blank; carrying out rough rolling, finish rolling, cooling after rolling and coiling on the hot plate blank to obtain a hot rolled coil; wherein the finish rolling temperature of the finish rolling is less than or equal to 920 ℃, and the coiling temperature is less than or equal to 670 ℃; and flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, and then pickling to obtain the hot-formed pickled steel plate without surface corrosion. According to the embodiment of the invention, the intergranular oxidation condition is controlled by controlling the heating temperature to be less than or equal to 1290 ℃, the heating time to be less than or equal to 280min, the finish rolling temperature to be less than or equal to 920 ℃ and the coiling temperature to be less than or equal to 670 ℃, and the plate shape is improved by flattening, so that the surface intergranular oxidation region is effectively prevented from being damaged, and the occurrence of corrosion caused by uneven oil coating (microcracks) after hot rolling and pickling is prevented.
Description
Technical Field
The embodiment of the invention relates to the technical field of ferrous metallurgy, in particular to a method for reducing the occurrence rate of corrosion on the surface of a hot-forming pickled steel plate.
Background
In view of the production cost of the automobile industry and the pressure of market demand, steel materials which are light and cold in hot zone become the mainstream. In the case of stabilizer bars and connecting columns for automobiles, pickling hot forming steel becomes a mainstream product in recent years, and under the condition, higher requirements are put on the surface quality after pickling, and any surface problems influencing the use of customers are not allowed to appear. The automobile connecting column mainly comprises an A column and a B column, and the steel grade is mainly developed into 22MnB 5. The stabilizer bar of the automobile is mainly hollow bar, and the steel grade is mainly developed into 27MnB5 and 34MnB 5. After hot rolling, in order to improve the shape of the plate, the hot rolled coil is sent to a client after the pulling and straightening processes and then is subjected to acid pickling, but the surface of the strip steel is rusted after a period of time, so that the subsequent use of the client is influenced.
Therefore, how to develop a method for reducing the occurrence rate of corrosion on the surface of the hot-forming pickled steel plate is a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention aims to provide a method for reducing the occurrence rate of corrosion on the surface of a hot-forming pickling steel plate, so that the occurrence rate of corrosion on the surface of the hot-forming pickling steel plate is reduced, and the problem of corrosion of a steel coil after pickling for a period of time is avoided.
In order to achieve the above object, an embodiment of the present invention provides a method for reducing occurrence rate of corrosion on a surface of a hot-formed pickled steel plate, the method including:
heating the steel casting blank for hot forming for less than or equal to 280min before rolling at the temperature of less than or equal to 1290 ℃ to obtain a hot plate blank;
carrying out rough rolling, finish rolling, cooling after rolling and coiling on the hot plate blank to obtain a hot rolled coil; wherein the finish rolling temperature of the finish rolling is less than or equal to 920 ℃, and the coiling temperature is less than or equal to 670 ℃;
and flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, and then pickling to obtain the hot-formed pickled steel plate without surface corrosion.
Further, the temperature of heating before rolling is 1150-1290 ℃, and the time of heating before rolling is 180-280 mim.
Further, the finish rolling temperature of the finish rolling is 830-920 ℃.
Further, the coiling temperature is 560-670 ℃.
Further, the temper rolling force is 180-320 t.
Further, the steel grade of the steel for hot forming comprises one of 22MnB5, 27MnB5 and 34MnB5, and the thickness of the steel for hot forming is 1.5-7 mm.
Further, in the rough rolling, 3+3 passes are adopted for rolling, the rolling speed is controlled to be 2-5 m/s, the total deformation of the rough rolling is controlled to be 75-85%, and the inlet temperature of the rough rolling is controlled to be 1140-1170 ℃.
Furthermore, in the precision rolling, 6 passes of rolling are adopted, the rolling speed is controlled to be 8-12 mm/s, and the total deformation of the precision rolling is controlled to be 85-95%.
Further, the post-rolling cooling comprises: cooling to 670 ℃ or less at the speed of 30-50 ℃/s.
Further, flattening the hot rolled coil under flattening rolling force not more than 320t, and then pickling to obtain the steel pickled plate for hot forming without surface corrosion, comprising the following steps of:
flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, pickling by using a pickling tank at the speed of 150-250 m/min, and rinsing to obtain a hot-forming steel pickled plate without surface corrosion; wherein the temperature of acid in the pickling tank is controlled to be 75-90 ℃, and the concentration of the acid is 45-30 g/L; the HCl concentration in the rinsing is 0.0008-0.001 g/L.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides a method for reducing the occurrence rate of corrosion on the surface of a hot-forming pickled steel plate, which comprises the following steps: heating the steel casting blank for hot forming for less than or equal to 280min before rolling at the temperature of less than or equal to 1290 ℃ to obtain a hot plate blank; carrying out rough rolling, finish rolling, cooling after rolling and coiling on the hot plate blank to obtain a hot rolled coil; wherein the finish rolling temperature of the finish rolling is less than or equal to 920 ℃, and the coiling temperature is less than or equal to 670 ℃; flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, and then pickling to obtain a steel pickled plate for hot forming without surface corrosion; according to the method, the intergranular oxidation condition is controlled by controlling the heating temperature to be less than or equal to 1290 ℃, the heating time to be less than or equal to 280min, the finish rolling temperature to be less than or equal to 920 ℃ and the coiling temperature to be less than or equal to 670 ℃, and the plate shape is improved by flattening instead of a tension-straightening mode, so that the surface intergranular oxidation region is effectively prevented from being damaged, and the phenomenon of rusting caused by uneven oil coating (microcracks) after hot coil pickling is prevented.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a view showing a surface layer of a steel sheet obtained in comparative example 1 after pickling;
FIG. 2 is a view showing a surface layer of the pickled steel sheet obtained in example 1;
FIG. 3 is a view showing a surface layer of a steel sheet obtained in comparative example 6 after pickling;
FIG. 4 is a view showing a surface layer of a steel sheet obtained in comparative example 7 after pickling;
FIG. 5 is a view showing a surface layer of a steel sheet obtained in comparative example 8 after pickling;
FIG. 6 is a view showing a surface layer of a pickled steel sheet obtained in comparative example 9;
FIG. 7 is a flowchart of a method for reducing the occurrence of corrosion on the surface of a hot-formed pickled steel plate according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the embodiments of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that the present embodiments and examples are illustrative of the present invention and are not to be construed as limiting the present invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the invention belong. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the examples of the present invention are commercially available or can be prepared by an existing method.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
according to an exemplary embodiment of the present invention, there is provided a method for reducing the occurrence of corrosion on a surface of a pickled steel sheet for hot forming, as shown in fig. 7, the method including:
s1, heating the steel casting blank for hot forming for less than or equal to 280min before rolling at the temperature of less than or equal to 1290 ℃ to obtain a hot plate blank;
s2, carrying out rough rolling, finish rolling, cooling after rolling and coiling on the hot plate blank to obtain a hot rolled coil; wherein the finish rolling temperature of the finish rolling is less than or equal to 920 ℃, and the coiling temperature is less than or equal to 670 ℃;
s3, flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, and then pickling to obtain the steel pickled plate for hot forming without surface corrosion.
From the above, it can be seen that the general idea of the method for reducing the occurrence rate of corrosion on the surface of the hot-formed pickled steel plate provided by the embodiment of the invention is as follows:
influence of slab heating temperature and furnace time:
and after the plate blank is offline from the continuous casting machine, the tissue is sent into a heating furnace for heating and heat preservation. For most steel grades, the requirements on the heating temperature and the heat preservation time of the plate blank are relatively wide due to the influence of the production rhythm. However, the inventor of the patent finds that the heating temperature and the furnace time of the plate blank have hereditary images on the generation of the intergranular oxidation of the surface layer of the hot-forming steel, and the depth of the intergranular oxidation layer of the surface layer of the strip steel can be reduced by controlling the heating temperature before rolling to be less than or equal to 1290 ℃ and controlling the heating time before rolling to be less than or equal to 280min along with the reduction of the heating temperature and the heat preservation time of the plate blank.
Influence of finishing temperature and coiling temperature:
after the heated plate blank is subjected to multi-pass rough rolling and finish rolling, the inventor of the patent finds that the final rolling temperature is controlled to be less than or equal to 920 ℃, the coiling temperature is controlled to be less than or equal to 670 ℃, namely the actual temperature of the lower coil is reduced, the intercrystalline oxidation depth of the surface layer of the strip steel can be reduced, and the main principle is that the reaction time and the reaction rate of oxygen in the air and carbon on the surface layer of the hot coil are reduced.
Influence of leveling by using leveling machine instead of tension leveler
The test shows that: for hot forming steel, the content of C is low, the content of Mn is high, and after hot rolling and rolling, the surface decarburization of the steel is difficult to avoid, so that intergranular oxidation is formed. For thin hot forming steel with the thickness of 1.5-7mm, the shape of the plate needs to be improved to ensure the quality of the plate. The tension leveler mainly comprises a bending roller set and a correcting roller set, is influenced by bending stress and tensile stress, and generates micro cracks due to softer intergranular oxidation generated on the surface layer of a hot coil under the influence of the bending stress, and is actually rolling deformation with small reduction, so that the damage to the intergranular oxidation layer area is slight, and therefore, the tension leveler is used for leveling but not used, so that the damage degree of the intergranular oxidation area can be reduced and the micro cracks on the surface layer can be generated.
As an optional implementation mode, the temperature of the heating before rolling is 1150-1290 ℃, and the time of the heating before rolling is 180-280 mim. The range can reduce the depth of the intergranular oxidation layer on the surface layer of the strip steel, and if the heating temperature is too high, the heating time is too long, so that the depth of the intergranular oxidation layer on the surface layer of the strip steel is not reduced; if the heating temperature is lower than 1150 ℃, the heating time is shorter than 180 mm, slab rolling is not facilitated, and the risk of scrap steel is large;
in an optional embodiment, the finish rolling temperature of the finish rolling is 830-920 ℃. If the finishing rolling temperature is higher than 920 ℃, the reduction of the depth of an intercrystalline oxide layer on the surface layer of the strip steel is not facilitated; if the finishing temperature is lower than 830 ℃, the hot rolling performance control is not facilitated, and the use requirements of customers cannot be met;
in an alternative embodiment, the coiling temperature is 560 to 670 ℃. If the coiling temperature is higher than 670 ℃, the depth of an intergranular oxidation layer on the surface layer of the strip steel is not reduced; if the coiling temperature is lower than 560 ℃, the hot coiling performance control is not facilitated, and the use requirements of customers cannot be met;
in an optional embodiment, the temper rolling force is 180-320 t. If the temper rolling force is larger than 320t, the damage degree of the intergranular oxidation area is not reduced; if the flattening rolling force is less than 180t, the hot coil shape control is not facilitated;
as one optional embodiment, the steel grade of the steel for hot forming comprises one of 22MnB5, 27MnB5 and 34MnB5, and the thickness of the steel for hot forming is 1.5-7 mm. The method is suitable for hot forming steel or steel grades which are easy to generate intergranular oxidation in the rolling process, the principle of the method is suitable for a hot rolling and acid pickling production line, and the method can avoid corrosion by optimizing a hot rolling process and a finishing procedure under the conditions of the components, the hot rolling production process and equipment of the existing steel grades, thereby greatly reducing loss.
In an optional embodiment, in the rough rolling, 3+3 passes are adopted for rolling, the rolling speed is controlled to be 2-5 m/s, the total deformation of the rough rolling is controlled to be 75-85%, and the inlet temperature of the rough rolling is controlled to be 1140-1170 ℃. The arrangement is favorable for controlling the temperature drop in the rough rolling process and ensuring the uniformity of the hot coil head and tail structure performance.
In an optional embodiment, in the fine rolling, 6 passes of rolling are adopted, the rolling speed is controlled to be 8-2 mm/s, and the total deformation amount of the fine rolling is controlled to be 85-95%. The arrangement is favorable for controlling the temperature drop in the finish rolling process and ensuring the uniformity of the hot coil head and tail structure performance.
As an alternative embodiment, the post-rolling cooling comprises: and cooling to be less than or equal to 670 ℃ at the speed of 30-50 ℃/s by adopting a front-end cooling mode of an ultra-fast cooling process. Too low a cooling rate adversely affects the increase in the strength of the structure, and too high a cooling rate adversely affects the appearance of an excessively hard structure phase.
The method for reducing the occurrence of rust on the surface of a hot-formed pickled steel sheet according to the present invention will be described in detail with reference to examples, comparative examples and experimental data.
S1, heating the steel casting blank for hot forming for less than or equal to 280min before rolling at the temperature of less than or equal to 1290 ℃ to obtain a hot plate blank;
s2, carrying out rough rolling, finish rolling, cooling after rolling and coiling on the hot plate blank to obtain a hot rolled coil; wherein the finish rolling temperature of the finish rolling is less than or equal to 920 ℃, and the coiling temperature is less than or equal to 670 ℃;
s3, flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, and then pickling to obtain the steel pickled plate for hot forming without surface corrosion.
The process parameters in the comparative examples were different and are specifically shown in table 1. 10 hot-formed pickled steel sheets were obtained from 10 test specimens per set of the test materials in examples 1 to 3 and comparative examples 1 to 9, respectively;
TABLE 1 Process parameters
The results of statistics of the occurrence of rust on the surfaces of 10 hot-forming pickled steel sheets obtained from each group are shown in Table 2.
TABLE 2
| Group of | The occurrence rate of rust corrosion% |
| Example 1 | 0 |
| Example 2 | 0 |
| Example 3 | 0 |
| Comparative example 1 | 100 |
| Comparative example 2 | 80 |
| Comparative example 3 | 70 |
| Comparative example 4 | 90 |
| Comparative example 5 | 50 |
| Comparative example 6 | 0 |
| Comparative example 7 | 0 |
| Comparative example 8 | 0 |
| Comparative example 9 | 0 |
From the data in table 2, it can be seen that:
in a comparative example 1, after pulling and straightening, pickling is carried out, other process parameters are the same as those of the example 1, the surfaces of the 10 hot-forming pickled steel plates are rusted, the rusting occurrence rate reaches 100%, the surface layer of a pickled coil has obvious microcracks, and the crack depth is about 10 mu m; in contrast, in example 1, after the coil is flattened and then pickled, no obvious microcracks are found on the surface layer of the pickled coil.
In the comparative example 2, the heating temperature before rolling is 1350 ℃, the heating time before rolling is 300 ℃, which is greater than the range that the heating temperature before rolling is less than or equal to 1290 ℃ and the heating time before rolling is less than or equal to 280min in the embodiment of the invention, other process parameters are the same as the embodiment 1, and the occurrence rate of rust corrosion reaches 80 percent;
in the comparative example 3, the finish rolling temperature is 950 ℃, which is larger than the range of not more than 920 ℃ in the embodiment of the invention, other process parameters are the same as those in the embodiment 1, and the occurrence rate of rust corrosion reaches 70 percent;
in the comparative example 4, the coiling temperature is 700 ℃, which is larger than the range of less than or equal to 670 ℃ in the embodiment of the invention, other process parameters are the same as those in the embodiment 1, and the corrosion incidence rate reaches 90 percent;
in the comparative example 5, the temper rolling force is 350t which is larger than the range of less than or equal to 320t of the embodiment of the invention, other process parameters are the same as those of the embodiment 1, and the corrosion incidence rate reaches 50 percent;
in comparative examples 6 to 9, which are steels for automobile structures, no obvious microcrack is found in the steel grades S500MC or SPFH590 in either the drawing and straightening machine or the leveling machine, and no corrosion occurs.
The rust problem in examples 1 to 3 is that the surface quality of the pickled plate is good.
Description of the drawings 1-6:
the detection diagram of the surface layer of the steel plate of the hot coil for hot forming of the comparative example 1 after pulling, straightening and pickling is shown in figure 1, the surface layer of the pickled coil has obvious microcracks, and the crack depth is about 10 um; on the other hand, the hot coil of the hot-forming steel of example 1 was flattened and then pickled as shown in FIG. 2, and no significant micro-cracks were observed in the surface layer of the pickled coil.
As can be seen from fig. 3 to 6, the automobile steels S500MC and SPFH590 have low Mn content, and no obvious microcrack is found and no corrosion occurs either in the finishing by the withdrawal leveler or the finishing by the leveler.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to encompass such modifications and variations.
Claims (10)
1. A method for reducing the occurrence rate of corrosion on the surface of a hot-forming pickled steel plate, which is characterized by comprising the following steps:
heating the steel casting blank for hot forming for less than or equal to 280min before rolling at the temperature of less than or equal to 1290 ℃ to obtain a hot plate blank;
carrying out rough rolling, finish rolling, cooling after rolling and coiling on the hot plate blank to obtain a hot rolled coil; wherein the finish rolling temperature of the finish rolling is less than or equal to 920 ℃, and the coiling temperature is less than or equal to 670 ℃;
and flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, and then pickling to obtain the hot-formed pickled steel plate without surface corrosion.
2. The method for reducing the occurrence rate of rust on the surface of a hot-formed and pickled steel plate as claimed in claim 1, wherein the temperature of heating before rolling is 1150-1290 ℃ and the time of heating before rolling is 180-280 mm.
3. The method for reducing the occurrence rate of corrosion on the surface of a hot-formed pickled steel plate as claimed in claim 1, wherein the finish rolling temperature of the finish rolling is 830-920 ℃.
4. The method for reducing the occurrence of rust on the surface of a hot-formed pickled steel sheet as claimed in claim 1, wherein the coiling temperature is 560 to 670 ℃.
5. The method for reducing the occurrence of corrosion on the surface of a hot-formed pickled steel plate as claimed in claim 1, wherein the temper rolling force is 180-320 t.
6. The method for reducing the occurrence of rust on the surface of a hot-formed and pickled steel plate as claimed in claim 1, wherein the steel grade of the hot-formed steel comprises one of 22MnB5, 27MnB5 and 34MnB5, and the thickness of the hot-formed steel is 1.5-7 mm.
7. The method for reducing the occurrence rate of corrosion on the surface of a hot-formed pickled steel plate as claimed in claim 1, wherein the rough rolling is performed by 3+3 passes, the rolling speed is controlled to be 2-5 m/s, the total deformation of the rough rolling is controlled to be 75-85%, and the inlet temperature of the rough rolling is controlled to be 1140-1170 ℃.
8. The method for reducing the occurrence rate of corrosion on the surface of a hot-formed pickled steel plate as claimed in claim 1, wherein the finish rolling is performed in 6 passes, the rolling speed is controlled to be 8-12 mm/s, and the total deformation of the finish rolling is controlled to be 85-95%.
9. The method of reducing the incidence of rust on the surface of a hot formed, pickled steel sheet as claimed in claim 1, wherein said post-rolling cooling comprises: cooling to 670 ℃ or less at the speed of 30-50 ℃/s.
10. The method of claim 1, wherein the hot rolled coil is flattened under a flattening rolling force of not more than 320t, and then is pickled to obtain the hot-formed pickled steel plate without surface corrosion, the method comprises the following steps:
flattening the hot rolled coil under the flattening rolling force of less than or equal to 320t, pickling by using a pickling tank at the speed of 150-250 m/min, and rinsing to obtain a hot-forming steel pickled plate without surface corrosion; wherein the temperature of acid in the pickling tank is controlled to be 75-90 ℃, and the concentration of the acid is 45-30 g/L; the HCl concentration in the rinsing is 0.0008-0.001 g/L.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1788870A (en) * | 2004-12-14 | 2006-06-21 | 宝钢集团上海第一钢铁有限公司 | On-line heat treatment method for hot rolling stainless steel band for cold rolling |
| CN103949480A (en) * | 2014-04-28 | 2014-07-30 | 沈阳大学 | Method for controlling oxide scales on surfaces of easily-pickled hot-rolled strip steel |
| CN104138901A (en) * | 2014-07-17 | 2014-11-12 | 首钢总公司 | Production method of hot-rolled acid pickling band steel with thickness being smaller than or equal to 1.6mm |
| CN107952815A (en) * | 2017-11-16 | 2018-04-24 | 北京首钢股份有限公司 | A kind of production method of hot rolling acid-cleaning plate |
| CN109865742A (en) * | 2019-02-27 | 2019-06-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of 440MPa grades of thin gauge hot rolling acid-cleaning Automobile Plate |
| US20190201954A1 (en) * | 2017-12-28 | 2019-07-04 | Hyundai Steel Company | Coil width control method and apparatus |
| US20190299263A1 (en) * | 2015-12-14 | 2019-10-03 | Baoshan Iron & Steel Co., Ltd. | Rolling and preparation method of magnesium alloy sheet |
| CN111570537A (en) * | 2020-05-22 | 2020-08-25 | 江苏联峰实业有限公司 | Hot rolling process for improving strength and fracture toughness of steel bar |
| CN111659732A (en) * | 2020-06-08 | 2020-09-15 | 首钢集团有限公司 | Method for solving corrosion of high-manganese hot-formed steel after pickling |
-
2021
- 2021-03-31 CN CN202110354757.0A patent/CN113145654A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1788870A (en) * | 2004-12-14 | 2006-06-21 | 宝钢集团上海第一钢铁有限公司 | On-line heat treatment method for hot rolling stainless steel band for cold rolling |
| CN103949480A (en) * | 2014-04-28 | 2014-07-30 | 沈阳大学 | Method for controlling oxide scales on surfaces of easily-pickled hot-rolled strip steel |
| CN104138901A (en) * | 2014-07-17 | 2014-11-12 | 首钢总公司 | Production method of hot-rolled acid pickling band steel with thickness being smaller than or equal to 1.6mm |
| US20190299263A1 (en) * | 2015-12-14 | 2019-10-03 | Baoshan Iron & Steel Co., Ltd. | Rolling and preparation method of magnesium alloy sheet |
| CN107952815A (en) * | 2017-11-16 | 2018-04-24 | 北京首钢股份有限公司 | A kind of production method of hot rolling acid-cleaning plate |
| US20190201954A1 (en) * | 2017-12-28 | 2019-07-04 | Hyundai Steel Company | Coil width control method and apparatus |
| CN109865742A (en) * | 2019-02-27 | 2019-06-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of 440MPa grades of thin gauge hot rolling acid-cleaning Automobile Plate |
| CN111570537A (en) * | 2020-05-22 | 2020-08-25 | 江苏联峰实业有限公司 | Hot rolling process for improving strength and fracture toughness of steel bar |
| CN111659732A (en) * | 2020-06-08 | 2020-09-15 | 首钢集团有限公司 | Method for solving corrosion of high-manganese hot-formed steel after pickling |
Non-Patent Citations (2)
| Title |
|---|
| 王健等: "热轧酸洗板常见质量问题及预防措施", 《冶金丛刊》, no. 03, 15 June 2012 (2012-06-15), pages 43 - 48 * |
| 谭文等: "武钢500MPa级免酸洗汽车大梁钢氧化皮研究", 《轧钢》, no. 03, 15 June 2012 (2012-06-15), pages 11 - 13 * |
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