CN114086194A - Method for improving surface cleanliness of steel strip under mixed production condition of silicon steel and carbon steel - Google Patents
Method for improving surface cleanliness of steel strip under mixed production condition of silicon steel and carbon steel Download PDFInfo
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- CN114086194A CN114086194A CN202111371808.7A CN202111371808A CN114086194A CN 114086194 A CN114086194 A CN 114086194A CN 202111371808 A CN202111371808 A CN 202111371808A CN 114086194 A CN114086194 A CN 114086194A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/06—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using emulsions
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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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Abstract
The invention discloses a method for improving the surface cleanliness of a steel strip under the condition of mixed production of silicon steel and carbon steel.
Description
Technical Field
The invention relates to the field of cold rolling of silicon steel and carbon steel, in particular to a method for improving the surface cleanliness of a steel strip under the condition of mixed production of silicon steel and carbon steel.
Background
Most continuous cold rolling production lines only produce carbon steel (Si is less than or equal to 0.1%), most of the production silicon steel (Si is more than 0.8%) is special rolling mills, a large amount of silicon mud (mainly comprising amorphous SiO2, iron powder, carbon powder, impurities and the like) is produced in the silicon steel rolling process to pollute emulsion, under the condition of sharing one set of emulsion system, the production lines reproduce carbon steel in the production of silicon steel, and a large amount of silicon mud is attached and precipitated on the surface of the carbon steel.
The method for improving the surface cleanliness of the cold-rolled strip steel and the equipment thereof in the Chinese patent CN 104438382A uses a chemical agent to clean the upper and lower surfaces of the strip steel, but the invention does not increase the filtering equipment, can improve the cleanliness by controlling the indexes of emulsion, the purging flow of annealing hydrogen, leveling and the oil coating amount of re-coiling, and has the advantages of quick effect and low cost.
Saddle steel science and technology, 2008, phase 1, published "measures to improve the surface cleanliness of rolled strip steel", and the measures to improve the cleanliness are explained only from the aspects of how each parameter of emulsion affects the surface cleanliness of strip steel and emulsion management; the invention covers the whole production period of the strip steel, and especially plays a key role in the cleanliness of the strip steel by control indexes such as emulsion ash, iron powder, hydrogen flow, steel coil oil coating amount and the like, and is more comprehensive and has a practical guidance function compared with the article.
Chinese patent CN 110947782B entitled method for improving cleaning effect of cold-rolled strip steel, which adopts a strip steel cleanliness detector to detect the cleanliness of the surface of the strip steel before and/or after cleaning, and controls the process parameters of each washing tank in the cleaning section according to the detected cleanliness information to ensure the cleaning effect of the strip steel. The invention can reach the required cleanliness (reflectivity) value without the process of over-cleaning or degreasing the strip steel, thereby reducing the process and the manufacturing cost.
Disclosure of Invention
The invention aims to provide a method for improving the surface cleanliness of a steel strip under the condition of mixed production of silicon steel and carbon steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for improving the surface cleanliness of a steel strip under the mixed production condition of silicon steel and carbon steel, wherein the silicon steel and the carbon steel share the same emulsion system, and the rolled carbon steel is subjected to annealing, leveling and rewinding procedures without being cleaned and degreased to obtain a cold-rolled finished coil;
wherein: after the cold rolling unit produces silicon steel, before producing carbon steel, the emulsion index is as follows: the ash content of the emulsion supplied to the first 4 rolling mills is less than 700mg/kg, the iron powder is less than 300mg/kg, and the conductivity is less than 300 mu s/cm; the ash content of the emulsion of the powder supply machine frame is less than 300mg/kg, the iron powder is less than 150mg/kg, and the conductivity is less than 100 mu s/cm;
the concentration of the emulsion of the front 4 rolling mills for acid rolling is 2.0-3.8%, and the concentration of the emulsion of the last mill is 0.7-1.1%; filtering the emulsion by a vacuum filter, and adopting filter paper with the thickness of 15-40 mu m; after acid rolling, the residual iron on the plate surface is less than 150mg/kg, and the residual oil is less than 300 mg/kg;
surface roughness Ra range of the working roll of the rolling mill: the front 4 frames are 0.6 mu m-1.0 μm, 1.8-4.0 μm of final frame, and 38-42N/mm of coiling tension2。
Further, the annealing is a cover-type annealing process, and the hydrogen flow of the annealing process in the temperature rise stage is 26-40 m3And h, the purging time is 6-14 h.
Furthermore, the concentration of the leveling solution in the leveling process is 4.5-5.0%, the conductance is 12.7-14 ms/cm, the air blowing pressure is not less than 5.5bar, and the amount of oil is not coated on the steel coil after leveling.
Further, the rewinding step: placing time of steel coil after flattening<48h, the oil amount of the double-sided coating in the rewinding procedure is 400-600 mg/m2。
Furthermore, the surface reflectivity of the obtained carbon steel coil reaches 72-80%.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, under the condition of the existing production line, the equipment investment is not increased, and by controlling various process parameter indexes of the production line, the steel strip does not need to be subjected to a degreasing cleaning procedure, so that the surface cleanliness of the steel strip can meet the use requirement of a user, and the aim of reducing the manufacturing cost is achieved.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The sequence of steps used in the examples: carbon steel hot rolling coil, pickling, cold rolling, cover annealing, leveling and coil recoiling.
Example 1:
before the carbon steel is produced in the cold rolling process, the indexes of the emulsion are controlled and detected as follows: the concentration of the emulsion for the first 4 rolling mills is 2.8 percent, the ash content is 680mg/kg, the iron powder content is 210mg/kg, and the electric conductivity is 260 mu s/cm; the concentration of the powder supply machine frame emulsion is 0.8 percent, the ash content is 280mg/kg, the iron powder is 135mg/kg, and the electric conductivity is 89 mu s/cm. The emulsion had a pH of 5.7, a saponification value of 165mg/g, an acid value of 28mgKOH/g, an ESI of 50% and a chloride ion content of 35 mg/L. The temperature of the emulsion tank is 52 ℃, and the vacuum filter adopts 15 μm filter paper. After cold rolling according to the indexes of the emulsion, the surface residual iron of the strip steel plate is detected to be 85mg/kg and the surface residual oil of the strip steel plate is detected to be 182 mg/kg.
Surface roughness Ra of the front 4 stand rolling mill work roll: 0.8 μm working roll meter of final stand rolling millSurface roughness Ra: 3.8 μm, winding tension 38N/mm2。
The hydrogen flow rate in the temperature rising stage of the annealing process is 40m3H, purging time is 8 h; heat preservation section hydrogen flow rate 18m3H, the hydrogen flow is maintained until the end of the incubation.
The concentration of the leveling liquid in the leveling procedure is 4.8%, the conductivity is 13.5ms/cm, the air blowing pressure is 6.0bar, and the oil coating amount of the leveled steel coil is 0. The steel coil is placed for 12 hours after being leveled, and the oil mass is coated on two sides of the rewinding procedure by 400mg/m2。
The carbon steel coil is obtained by the method, and the reflectivity of the surface of the strip steel is detected to be 75%.
Example 2:
before producing cold-rolled carbon steel, various indexes of the emulsion are controlled as follows: the concentration of the emulsion for the first 4 rolling mills is 2.5 percent, the ash content is 650mg/kg, the iron powder is 198mg/kg, and the conductivity is 273 mu s/cm; the concentration of the emulsion in the powder supply machine frame is 1.0 percent, the ash content is 266mg/kg, the iron powder is 142mg/kg, and the electric conductivity is 65 mu s/cm. The emulsion had a pH of 6.2, a saponification value of 171mg/g, an acid value of 23mgKOH/g, an ESI of 55% and a chloride ion content of 32 mg/L. The temperature of the emulsion box is 50 ℃, and the vacuum filter adopts 20 mu m filter paper. After cold rolling according to the indexes of the emulsion, the residual iron on the surface of the strip steel plate is detected to be 83mg/kg and the residual oil is detected to be 220 mg/kg.
Surface roughness Ra of the first 4 stand rolling mill work rolls: 0.75 μm, final stand mill work roll surface roughness Ra: 4.0 μm, take-up tension 40N/mm2。
Hydrogen flow rate of 35m in temperature rising stage of annealing process3H, purging time is 10 h; thermal insulation section hydrogen flow rate 22m3H, the hydrogen flow is maintained until the end of the incubation.
The concentration of the leveling liquid in the leveling procedure is 4.5%, the conductivity is 13ms/cm, the air blowing pressure is 6.0bar, and the oil coating amount of the leveled steel coil is 0. The steel coil is placed for 24 hours after being leveled, and the oil mass is coated on two sides of the rewinding procedure by 400mg/m2。
The carbon steel coil is obtained by the method, and the reflectivity of the surface of the strip steel is detected to be 78%.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A method for improving the surface cleanliness of a steel strip under the condition of mixed production of silicon steel and carbon steel is characterized by comprising the following steps: the silicon steel and the carbon steel share the same emulsion system, and the rolled carbon steel is not cleaned and degreased, and is annealed, leveled and rewound to obtain a cold-rolled finished coil;
wherein: after the cold rolling unit produces silicon steel, before producing carbon steel, the emulsion index is as follows: the ash content of the emulsion supplied to the first 4 rolling mills is less than 700mg/kg, the iron powder is less than 300mg/kg, and the conductivity is less than 300 mu s/cm; the ash content of the emulsion of the powder supply machine frame is less than 300mg/kg, the iron powder is less than 150mg/kg, and the conductivity is less than 100 mu s/cm;
the concentration of the emulsion of the front 4 rolling mills for acid rolling is 2.0-3.8%, and the concentration of the emulsion of the last mill is 0.7-1.1%; filtering the emulsion by a vacuum filter, and adopting filter paper with the thickness of 15-40 mu m; after acid rolling, the residual iron on the plate surface is less than 150mg/kg, and the residual oil is less than 300 mg/kg;
surface roughness Ra range of the working roll of the rolling mill: the front 4 machine frame is 0.6-1.0 μm, the last machine frame is 1.8-4.0 μm, and the coiling tension is 38-42N/mm2。
2. The method for improving the surface cleanliness of the steel strip under the condition of the silicon steel and carbon steel mixed production according to claim 1, which is characterized in that: the annealing is a cover annealing process, and the hydrogen flow of the annealing process is 26-40 m in the temperature rise stage3And h, the purging time is 6-14 h.
3. The method for improving the surface cleanliness of the steel strip under the condition of the silicon steel and carbon steel mixed production according to claim 1, which is characterized in that: the concentration of the leveling solution in the leveling process is 4.5-5.0%, the conductance is 12.7-14 ms/cm, the air blowing pressure is not less than 5.5bar, and the amount of oil is not coated on the steel coil after leveling.
4. Silicon according to claim 1The method for improving the surface cleanliness of the steel strip under the mixed production condition of steel and carbon steel is characterized by comprising the following steps of: the rewinding step: placing time of steel coil after flattening<48h, the oil amount of the double-sided coating in the rewinding process is 400-600 mg/m2。
5. The method for improving the surface cleanliness of the steel strip under the condition of the silicon steel and carbon steel mixed production according to claim 1, which is characterized in that: the surface reflectivity of the obtained carbon steel coil reaches 72-80%.
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| CN202111371808.7A CN114086194A (en) | 2021-11-18 | 2021-11-18 | Method for improving surface cleanliness of steel strip under mixed production condition of silicon steel and carbon steel |
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| CN202111371808.7A CN114086194A (en) | 2021-11-18 | 2021-11-18 | Method for improving surface cleanliness of steel strip under mixed production condition of silicon steel and carbon steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2126507A (en) * | 1982-09-02 | 1984-03-28 | Sumitomo Metal Ind | Method for producing clean cold strip |
| DE3235444A1 (en) * | 1982-09-24 | 1984-03-29 | Nihon Parkerizing Co. Ltd., Tokyo | Process for the production of a cleaned cold-rolled steel strip |
| JPH0569005A (en) * | 1991-09-11 | 1993-03-23 | Kobe Steel Ltd | Cold rolling method for obtaining high cleanness of surface of steel sheet |
| CN111014315A (en) * | 2019-12-20 | 2020-04-17 | 马钢(合肥)板材有限责任公司 | Method for improving surface reflectivity of rolled hard coil strip steel |
| CN111195656A (en) * | 2018-11-19 | 2020-05-26 | 宝山钢铁股份有限公司 | Rolling lubrication process and emulsion suitable for simultaneous production of plain carbon steel and high-strength steel |
-
2021
- 2021-11-18 CN CN202111371808.7A patent/CN114086194A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2126507A (en) * | 1982-09-02 | 1984-03-28 | Sumitomo Metal Ind | Method for producing clean cold strip |
| DE3235444A1 (en) * | 1982-09-24 | 1984-03-29 | Nihon Parkerizing Co. Ltd., Tokyo | Process for the production of a cleaned cold-rolled steel strip |
| JPH0569005A (en) * | 1991-09-11 | 1993-03-23 | Kobe Steel Ltd | Cold rolling method for obtaining high cleanness of surface of steel sheet |
| CN111195656A (en) * | 2018-11-19 | 2020-05-26 | 宝山钢铁股份有限公司 | Rolling lubrication process and emulsion suitable for simultaneous production of plain carbon steel and high-strength steel |
| CN111014315A (en) * | 2019-12-20 | 2020-04-17 | 马钢(合肥)板材有限责任公司 | Method for improving surface reflectivity of rolled hard coil strip steel |
Non-Patent Citations (2)
| Title |
|---|
| 张勇;张松岩;关立凯;张昕;付中华;: "普碳冷轧带钢表面清洁度再提高", 轧钢, vol. 34, no. 01, pages 87 - 90 * |
| 韩玉龙;王小平;付国平;: "冷轧后带钢板面清洁度的研究", 包钢科技, vol. 37, no. 03, pages 16 - 18 * |
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