CN112439798B - Control method for surface cross striations of pickled low-carbon steel strip - Google Patents
Control method for surface cross striations of pickled low-carbon steel strip Download PDFInfo
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- CN112439798B CN112439798B CN202011228950.1A CN202011228950A CN112439798B CN 112439798 B CN112439798 B CN 112439798B CN 202011228950 A CN202011228950 A CN 202011228950A CN 112439798 B CN112439798 B CN 112439798B
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- steel strip
- carbon steel
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- roller
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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
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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
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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 discloses a method for controlling transverse striations on the surface of an acid-washing low-carbon steel strip, which is characterized in that the content of nitrogen element, the feeding temperature and the insertion amount of an ACB roller are controlled by reducing the pinning effect of Coriolis gas clusters, fully separating out nitrogen atoms, bending the generated stress to be more than the upper yield strength of the steel strip and the like: the content of the nitrogen element is controlled within 50ppm, the feeding temperature is controlled below 45 ℃, and the insertion amount of the ACB roller is at least 400 mm; according to the invention, through researching the action mechanism of gas atoms in the steel strip and the deformation stress of the yield platform and the uncoiling process of the uncoiler, a corresponding solution is made, the transverse grain defect generated in the uncoiling process of the low-carbon steel of the pickling production line is overcome, and a better effect is obtained.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy and steel rolling processes, in particular to a method for controlling surface striations of an acid-washed low-carbon steel strip.
Background
The surface horizontal lines are folding marks perpendicular to the rolling direction of the steel strip and are often in low-carbon steel series, the hot-rolled raw material coil is easy to have such defects in the acid rolling and uncoiling process, the defects are generally appeared at the head and tail of the coil and are seriously penetrated through the whole coil surface, and obvious concave-convex feeling exists when the hot-rolled raw material coil is touched by hands.
Since the pickling is put into production, the low-carbon steel product is normally produced due to the appearance of the surface transverse striation defect, and the quality objection about the defect is received by customers for many times, and the defect is a main problem point for inhibiting the qualification rate and the yield of the pickled product in our factory from being improved. In order to solve the surface cross grain defect of the acid pickling low-carbon steel and deeply analyze the reason of the cross grain defect, the measures of controlling the content of nitrogen element, the feeding time interval, the feeding temperature, the ACB roller and the like are provided through long-time process grope, the process conditions are gradually solidified, the cross grain defect is obviously improved, the qualification rate and the yield of an acid pickling production line are obviously improved, and a solid foundation is laid for the acid pickling production line to successfully reach the product.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for controlling the cross striations on the surface of a pickled low-carbon steel strip, which is a method for further solving the problem of the cross striations on the surface of the pickled low-carbon steel strip by controlling technological process parameters; according to the invention, when the sudden transition of a steel strip from an elastic zone to a plastic zone under the action of stress is fully known, the phenomena of non-uniform and local flow deformation can be generated on the section of the steel strip under the action of a yield platform, and the transverse striation defect of an acid pickling product is finally solved by the thinking that the pinning effect of Coriolis gas clusters is reduced, nitrogen atoms are fully separated out, and the uncoiling bending stress is greater than the yield strength of the steel strip according to the deformation mechanism of the steel strip.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for controlling transverse striations on the surface of a pickled low-carbon steel strip controls three parameters of nitrogen element content, feeding temperature and ACB roller insertion amount, wherein: the content of the nitrogen element is controlled within 50ppm, the feeding temperature is controlled below 45 ℃, and the insertion amount of the ACB roller is at least 400 mm.
Compared with the prior art, the invention has the beneficial technical effects that:
by the method, the three parameter products are effectively controlled, so that the transverse striation defect of the acid-washed low-carbon steel is effectively controlled.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of the operation of the ACB roller;
FIG. 2 is a schematic diagram of the results of the process of the present invention.
Detailed Description
A method for controlling transverse striations on the surface of a pickled low-carbon steel strip mainly comprises the steps of controlling three parameters of nitrogen element content, feeding temperature and ACB roller insertion amount;
1. nitrogen content control
The higher the content of carbon and nitrogen atoms in the steel plate is, the more obvious the action of generating a pinning effect by a Coriolis gas mass formed by carbon and nitrogen atoms is, when solute atoms and dislocations generate elastic interaction in the acid washing and uncoiling process of a steel strip, the solute atoms can be gathered around the dislocations, the dislocation motion must break away from the gas mass or drag the gas mass to move together, so that the strip steel generates a yield platform, and uneven and local flow deformation can be generated on the section of the strip steel due to the effect of the yield platform, and surface yield transverse striations can be generated; in order to reduce the influence of the Coriolis gas mass on the steel strip, the nitrogen content in the steelmaking process is controlled within 50 ppm.
2. Temperature of charging
When the incoming material temperature of the strip steel is too high, the metal atoms in the strip steel are more active, the strip steel is easy to jump to a plastic deformation area from an elastic deformation area when being uncoiled and subjected to tension, a slip line is easy to generate on the surface of the strip steel, and then the cross grain defect is caused, the feeding temperature is controlled below 45 ℃ through statistics of a large amount of test data, and the generation amount of the cross grain defect can be effectively controlled.
Insertion amount of ACB roll
The ACB roller has the function that the strip steel generates reverse bending deformation, and when the algebraic sum of the internal stress of the strip steel and the stress generated by the bending of the strip steel by the ACB roller is greater than the upper yield strength and the generated deformation exceeds the yield extension area of the strip steel, the generation of transverse striations can be avoided, and the action condition is shown in figure 1; in order to avoid the cross striation, the insertion amount of the strip steel and the ACB roller is more than 400mm so as to ensure that the strip steel generates larger deformation.
Through the control of the three parameters, the transverse striation defect of the acid-washed low-carbon steel is effectively controlled, and the detailed description is shown in figure 2.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (1)
1. The method for controlling the transverse striations on the surface of the acid-washed low-carbon steel strip is characterized by controlling three parameters of nitrogen element content, feeding temperature and ACB roller insertion amount, wherein: the content of the nitrogen element is controlled within 50ppm, the feeding temperature is controlled below 45 ℃, and the insertion amount of the ACB roller is above 400 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011228950.1A CN112439798B (en) | 2020-11-06 | 2020-11-06 | Control method for surface cross striations of pickled low-carbon steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011228950.1A CN112439798B (en) | 2020-11-06 | 2020-11-06 | Control method for surface cross striations of pickled low-carbon steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112439798A CN112439798A (en) | 2021-03-05 |
| CN112439798B true CN112439798B (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011228950.1A Active CN112439798B (en) | 2020-11-06 | 2020-11-06 | Control method for surface cross striations of pickled low-carbon steel strip |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498284A (en) * | 2016-11-08 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of ultra-deep punching with hot continuous rolling pickling steel band |
| CN109321708A (en) * | 2018-11-28 | 2019-02-12 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of administering hot rolling acid-cleaning plate cross breaks defect |
| CN111438194A (en) * | 2020-03-31 | 2020-07-24 | 鞍钢股份有限公司 | Method for controlling transverse crease of low-carbon steel hot-rolled pickled plate |
-
2020
- 2020-11-06 CN CN202011228950.1A patent/CN112439798B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498284A (en) * | 2016-11-08 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of ultra-deep punching with hot continuous rolling pickling steel band |
| CN109321708A (en) * | 2018-11-28 | 2019-02-12 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of administering hot rolling acid-cleaning plate cross breaks defect |
| CN111438194A (en) * | 2020-03-31 | 2020-07-24 | 鞍钢股份有限公司 | Method for controlling transverse crease of low-carbon steel hot-rolled pickled plate |
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| CN112439798A (en) | 2021-03-05 |
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