CN113458163A - Production process of thin-specification hot-rolled and pickled steel for automobile structure - Google Patents
Production process of thin-specification hot-rolled and pickled steel for automobile structure Download PDFInfo
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- CN113458163A CN113458163A CN202110868364.1A CN202110868364A CN113458163A CN 113458163 A CN113458163 A CN 113458163A CN 202110868364 A CN202110868364 A CN 202110868364A CN 113458163 A CN113458163 A CN 113458163A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 238000005554 pickling Methods 0.000 claims abstract description 47
- 239000002253 acid Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 239000003112 inhibitor Substances 0.000 claims description 8
- 239000008237 rinsing water Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 235000008373 pickled product Nutrition 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000005097 cold rolling Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/06—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 de-scaling, e.g. by brushing of strip material
-
- 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
- B21B45/0275—Cleaning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to the technical field of steel smelting and processing, in particular to a production process of thin hot-rolled and pickled steel for an automobile structure. The production process comprises the steps of preparing a hot rolled plate by adopting a hot rolling process, and preparing structural steel with the specification of 0.8mm-2.5mm by using an acid pickling production line; the chemical element composition of smelting components of the hot rolling process comprises the following components in percentage by weight: 0.04% -0.10%, S i: 0.10% -0.50%, Mn: 1.00% -1.60%, Al t: 0.01 to 0.06 percent of S, less than or equal to 0.0030 percent of P, less than or equal to 0.015 percent of P and the balance of Fe element; the pickling production line comprises the steps of scale breaking, pickling, rinsing, leveling, straightening and withdrawal, and the finished product is prepared by coiling. According to the invention, the production of the 0.8mm-2.5mm thin hot-rolled pickled automobile structure steel R280VK is realized by adopting a hot-rolling pickling process, the surface quality of the product is better than that of the conventional hot-rolled pickled product, the dimensional precision is high, the performance is stable, the product can replace the 280VK cold-rolled product with the same specification, and the production cost of the product is reduced.
Description
Technical Field
The invention relates to the technical field of steel smelting and processing, in particular to a production process of thin hot-rolled and pickled steel for an automobile structure.
Background
Under the trend that the automobile market competition is increasingly violent, the hot-rolled acid-washed automobile steel meeting the requirement of the automobile structure service performance plays a greater role in the process of replacing cold with hot in the automobile industry, the environmental protection attention degree is further strengthened at present in China, and the environmental protection requirement is strict unprecedentedly, so that the discussion of the cost-reducing and environmental-friendly steel production process becomes an important direction for the common attention and the effort of the steel industry.
The 280VK thin gauge of 0.8mm-2.5mm steel for automobile structures can be produced only by a cold rolling production line in China, and the main process is molten iron desulphurization treatment → a converter → an LF furnace → slab continuous casting → heating → hot rolling → laminar cooling → coiling → cold rolling and acid pickling → cold rolling and rolling mill → cold rolling and annealing → cold rolling and leveling → finished products. The method has the advantages of long production period, high equipment and production cost and large environmental pressure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a production process of thin hot-rolled pickled steel for an automobile structure, which realizes the production of 0.8-2.5 mm thin hot-rolled pickled steel R280VK for the automobile structure by adopting a hot-rolled pickling process, has better surface quality, high dimensional precision and stable performance compared with the conventional hot-rolled pickled product, can replace 280VK cold-rolled products in the same specification, and reduces the production cost of the product.
The technical scheme of the invention is as follows:
a production process of thin-specification hot-rolled pickled steel for automobile structures is characterized in that hot-rolled plates are prepared by a hot-rolling process and then are prepared into structural steel with the specification of 0.8mm-2.5mm by a pickling production line; the chemical element composition and weight percentage of smelting components of the hot rolling process comprise C: 0.04% -0.10%, Si: 0.10% -0.50%, Mn: 1.00% -1.60%, Alt: 0.01 to 0.06 percent of S, less than or equal to 0.0030 percent of P, less than or equal to 0.015 percent of P and the balance of Fe element; the pickling production line comprises the steps of scale breaking, pickling, rinsing, leveling, straightening and withdrawal, and coiling to obtain a finished product.
Preferably, the descaling step comprises a descaling operation of the strip steel through a dry descaling machine, wherein the dry descaling machine comprises an upper bending system and a lower bending system, the bending system comprises an upper bending roll box and a lower bending roll box, and the straightening system comprises an anti-transverse bending roll box. Under the combined action of bending and tension generated by the rollers of the bending system and the straightening system, the strip shape of the strip steel is improved, and oxide scales on two surfaces of the strip steel are peeled off or generate cracks, so that good interface conditions are provided for acid washing.
Preferably, in the descaling step, the descaling elongation is 0.4-0.8%, the leveling elongation is 0.8-3.0%, the leveling mode is wet leveling, and the withdrawal and straightening elongation is 0.1-0.4%. The withdrawal straightening can make the plate shape of the product better, and simultaneously eliminate a yield platform and prevent the formation of a slip line.
Preferably, in the pickling step, a pickling agent and a corrosion inhibitor are placed in a pickling tank, wherein the corrosion inhibitor is 0.01-0.5 percent of the volume percentage of the pickling agent, and the acid liquor temperature of the pickling tank is 60-90 ℃. The corrosion inhibitor is used, so that the corrosion of residual H & lt + & gt in the pickling operation on a steel substrate can be effectively prevented, and the defects of blackening, insufficient pickling, over pickling and the like of the steel surface in the pickling process are reduced.
Preferably, the number of the pickling tanks is 4, and the adjacent pickling tanks are separated by a pair of wringing rollers and are used for preventing the strip steel from bringing the acid liquor into the next pickling tank, and the maximum pickling speed is 200-500 m/min. The strip steel after being descaled is subjected to an acid cleaning process, and can effectively remove oxides on the surface of the strip steel through the contact with an acid cleaning agent and a corrosion inhibitor. The total length of the pickling tank is 112 m.
Preferably, the strip steel after acid washing is subjected to 5-stage cascade rinsing by a rinsing tank; the rinsing tank is composed of 5 sections of cascade rinsing tanks, cascade overflow of rinsing water is opposite to the running direction of the strip steel, and each rinsing tank is separated by 1 pair of squeezing rollers; in the rinsing process, desalted water needs to be added into the rinsing water at a constant speed, and the passivant is dissolved in the desalted water. Therefore, the strip steel can be effectively cleaned to remove the residual acid liquor on the surface of the strip steel. The total length of the rinsing tank is 20 m.
Preferably, in the rinsing step, the rinsing passivator: the volume ratio of the desalted water is 0.01-0.3%, and the adding speed is 12m3/h。
Preferably, the smelting components of the hot rolling process comprise C: 0.054%, Si: 0.36%, Mn: 1.42%, P: 0.013%, S: 0.0009%, Alt: 0.024 percent, and the balance being Fe.
Preferably, the smelting components of the hot rolling process comprise C: 0.056%, Si: 0.36%, Mn: 1.41%, P: 0.012%, S: 0.0012%, Alt: 0.025% and the balance Fe.
Under the combined action of bending and tension generated by the rollers of the two-bending one-straightening unit of the scale breaker, the strip shape is improved, and oxide scales on two surfaces of the strip are peeled off or cracks are generated, so that a good interface condition is provided for acid washing.
The invention has the advantages of
The design of the invention solves the problems of subsequent cold rolling and annealing in the traditional production technology, and reduces the production cost. The product prepared by the production process has the performance meeting the standard requirement, shortens the process flow, saves energy, protects the environment and reduces the production cost.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a metallographic structure morphology chart of example 1 of the present invention.
FIG. 2 is a metallographic structure morphology map of example 2 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A production process for preparing thin hot-rolled and pickled steel with the specification of 1.5mm for an automobile structure comprises the following chemical element compositions in percentage by weight of smelting components in the hot rolling process: 0.54%, Si: 0.36%, Mn: 1.42%, P: 0.013%, S: 0.0009%, Alt: 0.024 percent, and the balance being Fe; the pickling production line mainly comprises the steps of scale breaking, pickling, rinsing, leveling, straightening and withdrawing, and finished products are prepared. The step of descaling comprises the step of descaling the strip steel through a dry descaling machine, wherein the dry descaling machine comprises an upper bending system, a lower bending system and a straightening system, the bending systems comprise an upper bending roller box and a lower bending roller box, and the straightening system comprises a transverse bending resistant roller box. In the scale breaking step, the scale breaking elongation is 0.77%, the leveling elongation is 0.8% -3.0%, the leveling mode is wet leveling, and the tension leveling elongation is 0.2%. The volume percentage of the acid washing agent and the corrosion inhibitor is 0.01-0.5 percent, and the acid liquor temperature of the acid washing tank is 60-90 ℃. The number of the pickling tanks is 4, and the adjacent pickling tanks are separated by a pair of wringing rollers and are used for preventing the strip steel from bringing the acid liquor into the next pickling tank, and the maximum pickling speed is 200-500 m/min. After acid washing5-section cascade rinsing is carried out on the strip steel through a rinsing tank; the rinsing tank is composed of 5 sections of cascade rinsing tanks, cascade overflow of rinsing water is opposite to the running direction of the strip steel, and each rinsing tank is separated by 1 pair of wringing rollers; in the rinsing process, desalted water needs to be added into the rinsing water at a constant speed, and the passivant is dissolved in the desalted water. In the rinsing process, the volume percentage of the rinsing passivator to the desalted water is 0.01-0.3%, and the adding speed is 12m3/h。
Example 2
A production process for preparing thin hot-rolled and pickled steel with the specification of 2.0mm for an automobile structure comprises the following chemical element compositions in percentage by weight of smelting components: 0.56%, Si: 0.36%, Mn: 1.41%, P: 0.012%, S: 0.0012%, Alt: 0.025%, and the balance of Fe; the pickling production line mainly comprises the steps of scale breaking, pickling, rinsing, leveling, straightening and withdrawing, and finished products are prepared. The step of descaling comprises the step of descaling the strip steel through a dry descaling machine, wherein the dry descaling machine comprises an upper bending system, a lower bending system and a straightening system, the bending systems comprise an upper bending roller box and a lower bending roller box, and the straightening system comprises a transverse bending resistant roller box. In the scale breaking step, the scale breaking elongation is 0.77%, the leveling elongation is 0.8% -3.0%, the leveling mode is wet leveling, and the tension leveling elongation is 0.2%. The volume percentage of the acid washing agent and the corrosion inhibitor is 0.01-0.5 percent, and the acid liquor temperature of the acid washing tank is 60-90 ℃. The number of the pickling tanks is 4, and the adjacent pickling tanks are separated by a pair of wringing rollers and are used for preventing the strip steel from bringing the acid liquor into the next pickling tank, and the maximum pickling speed is 200-500 m/min. 5-section cascade rinsing is carried out on the strip steel after the acid washing through a rinsing tank; the rinsing tank is composed of 5 sections of cascade rinsing tanks, cascade overflow of rinsing water is opposite to the running direction of the strip steel, and each rinsing tank is separated by 1 pair of wringing rollers; in the rinsing process, desalted water needs to be added into the rinsing water at a constant speed, and the passivant is dissolved in the desalted water. In the rinsing process, the volume percentage of the rinsing passivator to the desalted water is 0.01-0.3%, and the adding speed is 12m3/h。
Metallographic experiments are carried out on the samples 1-2 of the invention to obtain metallographic structure morphology diagrams 1 and 2.
The mechanical property parameters of the embodiment 1-2 of the invention and the advanced parameter standard of steel R280VK for automobile structures in the industry are summarized to prepare the following table 1.
TABLE 1 examples 1-2 and relevant Standard mechanical Properties parameters for Bao Steel
The data in the table 1 show that the invention can realize the production of the steel R280VK for the hot-rolled pickled automobile structure with the thin specification of 0.8-2.5 mm, and the product has better surface quality, high dimensional precision and stable performance compared with the conventional hot-rolled pickled product, can replace the 280VK cold-rolled product with the same specification, and reduces the production cost of the product.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A production process of thin-specification hot-rolled and pickled steel for automobile structures is characterized by comprising the following steps: the production process comprises the steps of preparing a hot rolled plate by adopting a hot rolling process, and preparing structural steel with the specification of 0.8mm-2.5mm by using an acid pickling production line; the chemical element composition and weight percentage of smelting components of the hot rolling process comprise C: 0.04% -0.10%, Si: 0.10% -0.50%, Mn: 1.00% -1.60%, Alt: 0.01 to 0.06 percent of S, less than or equal to 0.0030 percent of P, less than or equal to 0.015 percent of P and the balance of Fe element; the pickling production line comprises the steps of scale breaking, pickling, rinsing, leveling, straightening and withdrawal, and coiling to obtain a finished product.
2. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 1, wherein: the descaling step comprises the step of carrying out descaling operation on the strip steel through a dry descaling machine, wherein the dry descaling machine comprises an upper bending system, a lower bending system and a straightening system, the bending system comprises an upper bending roller box and a lower bending roller box, and the straightening system comprises an anti-transverse bending roller box.
3. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 2, wherein: in the scale breaking step, the scale breaking elongation is 0.4-0.8%, the leveling elongation is 0.8-3.0%, the leveling mode is wet leveling, and the straightening elongation is 0.1-0.4%.
4. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 1, wherein: in the pickling step, a pickling agent and a corrosion inhibitor are put into a pickling tank, wherein the corrosion inhibitor is 0.01-0.5 percent of the pickling agent by volume percent, and the temperature of the pickling tank acid liquor is 60-90 ℃.
5. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 4, wherein: the number of the pickling tanks is 4, and the adjacent pickling tanks are separated by a pair of wringing rollers and used for preventing the strip steel from bringing the acid liquor into the next pickling tank, and the maximum pickling speed is 200-500 m/min.
6. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 1, wherein: 5-section cascade rinsing is carried out on the strip steel after the acid washing through a rinsing tank; the rinsing tank is composed of 5 sections of cascade rinsing tanks, cascade overflow of rinsing water is opposite to the running direction of the strip steel, and each rinsing tank is separated by 1 pair of squeezing rollers; in the rinsing process, desalted water needs to be added into the rinsing water at a constant speed, and the passivant is dissolved in the desalted water.
7. The thin gauge hot rolled pickled automobile according to claim 6The production process of the structural steel is characterized by comprising the following steps: in the rinsing step, a passivating agent is rinsed: the volume ratio of the desalted water is 0.01-0.3%, and the adding speed is 12m3/h。
8. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 1, wherein: the smelting components of the hot rolling process comprise the following components in percentage by weight: 0.054%, Si: 0.36%, Mn: 1.42%, P: 0.013%, S: 0.0009%, Alt: 0.024 percent, and the balance being Fe.
9. The production process of the thin gauge hot rolled pickled steel for automobile structures as claimed in claim 1, wherein: the smelting components of the hot rolling process comprise the following components in percentage by weight: 0.056%, Si: 0.36%, Mn: 1.41%, P: 0.012%, S: 0.0012%, Alt: 0.025% and the balance Fe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110868364.1A CN113458163A (en) | 2021-07-30 | 2021-07-30 | Production process of thin-specification hot-rolled and pickled steel for automobile structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110868364.1A CN113458163A (en) | 2021-07-30 | 2021-07-30 | Production process of thin-specification hot-rolled and pickled steel for automobile structure |
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|---|---|---|---|---|
| CN105925891A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 310MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN106011646A (en) * | 2016-07-15 | 2016-10-12 | 武汉钢铁股份有限公司 | High-surface-quality automotive hot rolling acid pickling steel with tensile strength of 590 MPa and production method |
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2021
- 2021-07-30 CN CN202110868364.1A patent/CN113458163A/en active Pending
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Application publication date: 20211001 |