CN109943777B - Phosphated cold-rolled strip steel and manufacturing method thereof - Google Patents
Phosphated cold-rolled strip steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a phosphatized cold-rolled strip steel and a manufacturing method thereof, wherein the strip steel comprises the following chemical components in percentage by mass: 0.01-0.10% of C, 0.1-0.6% of Mn0.10%, less than or equal to 0.10% of Si, less than or equal to 0.10% of Al, less than or equal to 0.02% of P, less than or equal to 0.015% of S, and the balance of Fe and impurity elements. The invention adds a phosphating device between a leveling withdrawal and straightening machine and an oiling machine of a continuous annealing unit, wherein the phosphating device consists of a phosphating section, a rinsing section and a drying box. After uncoiling, the strip steel enters a phosphating area after conventional treatment such as welding, cleaning, annealing, leveling, straightening and the like, and the strip steel after phosphating is directly coiled into a coil without being coated with oil. The cold-rolled phosphating roll produced by the invention can simplify the production process of the client, improve the efficiency, improve the phosphating quality and solve the problem that the degreasing and cleaning of the client terminal do not completely influence the phosphating effect.
Description
Technical Field
The invention belongs to the technical field of steel production, and particularly relates to phosphatized cold-rolled strip steel and a manufacturing method thereof.
Background
The cold-rolled strip steel has the advantages of good surface smoothness, good smoothness, high size precision, good mechanical property and the like, can be used for manufacturing oil drum containers, and can also be used for manufacturing building boards, office supply cabinets, electronic machinery and the like. However, after the cold-rolled steel strip is formed and before the cold-rolled steel strip is coated, the cold-rolled steel strip needs to be subjected to phosphating treatment. In the processes of steel drum manufacturing process, such as steel coil uncoiling and blanking, drum bottom cover punch forming, drum body welding forming and assembling, surface phosphating, internal and external coating and the like, the surface phosphating treatment is an extremely important process. Phosphating is the process by which a metal reacts with dilute phosphoric acid or an acidic phosphate solution and forms a phosphate protective film on the metal surface that is insoluble in water. The phosphating film is used as a bottom layer of paint, electrophoresis and the like, can enhance the binding force of a base body and a coating, can prevent corrosion from diffusing to a cold-rolled substrate, and obviously improves the corrosion resistance of the coating.
At present, the phosphating treatment of cold-rolled strip steel is carried out at a client terminal, and a steel substrate is subjected to flattening, cutting, processing and forming, degreasing and cleaning, phosphating, cleaning, drying and paint spraying. Firstly, after a workpiece is machined and formed, because of the limitation of factors such as the geometric dimension and the shape of the workpiece, a dead angle which is not easy to clean, such as a groove, is inevitably formed, so that degreasing and water washing effects are influenced, the formation of a phosphating film is further hindered, the adhesion and corrosion resistance of a subsequent paint film are influenced even after the film is coated, and meanwhile, grooves are easily formed between a degreasing groove and a phosphating groove, so that the quality of the coated film is influenced, and the service life of a phosphating agent is influenced; secondly, the phosphorization treatment involves the discharge of carcinogenic pollutants such as phosphorization wastewater and waste residues, serious environmental pollution is caused by improper treatment, in addition, the phosphorization treatment process flow is complex, the energy consumption is high, and a lot of pressure and inconvenience are brought to customers.
Disclosure of Invention
In order to solve the technical problems, the invention provides a phosphatized cold-rolled strip steel and a manufacturing method thereof, wherein a phosphating device is added between a leveling and straightening machine and an oiling machine of a continuous annealing unit to prepare the oil drum strip steel which can be directly used for stamping and coating, and the components and the process of phosphating solution are further optimized to improve the film forming speed of a phosphating film, thereby shortening the phosphating time and improving the production efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a phosphatized cold-rolled steel strip comprises the following chemical components in percentage by mass: 0.01-0.10% of C, 0.1-0.6% of Mn0.10%, less than or equal to 0.10% of Si, less than or equal to 0.10% of Al, less than or equal to 0.02% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurity elements.
The manufacturing method of the phosphated cold-rolled strip steel comprises the steps of uncoiling the strip steel, welding, degreasing, cleaning, annealing, leveling, straightening and drawing, and coiling the phosphated strip steel into coils; wherein:
(1) the phosphating treatment equipment consists of a phosphating section, a rinsing section and a hot air drying box and is arranged between the leveling withdrawal and straightening machine and the oiling machine;
(2) the phosphating treatment also comprises cleaning and drying after the phosphating treatment;
(3) the phosphatized strip steel is directly coiled into coils without being coated with oil.
Furthermore, in the manufacturing method of the phosphated cold-rolled strip steel, the annealing temperature is 750-850 ℃, the strip speed is 100-160mpm, and the total elongation of leveling and withdrawal and correction is 1.0-1.5%.
Further, the phosphating treatment in the manufacturing method of the phosphated cold-rolled strip steel adopts a spray type process, the PH value of phosphating solution is 2-3, the phosphating time is 40-60s, and the temperature of the phosphating solution is 40-50 ℃.
Furthermore, in the manufacturing method of the phosphated cold-rolled strip steel, the component composition of the phosphating solution comprises: 60-100g/L of zinc dihydrogen phosphate, 50-80g/L of zinc nitrate, 10-18g/L of phosphoric acid, 1-3g/L of sodium chlorate, 5-7g/L of tartaric acid, 1-2g/L of sodium fluoride, 1-3g/L of hydroxylamine sulfate, 1-3g/L of phytic acid, 1-3g/L of methyl methacrylate and the balance of water.
Furthermore, the manufacturing method of the phosphated cold-rolled strip steel adopts a spray type process in rinsing, and the strip steel is cleaned by deionized water.
Furthermore, the manufacturing method of the phosphated cold-rolled strip steel adopts hot air drying, and the temperature is 80-90 ℃.
Furthermore, the phosphatized cold-rolled strip steel prepared by the method in the manufacturing method of the phosphatized cold-rolled strip steel can be directly subjected to painting and plastic spraying treatment.
Furthermore, the phosphated cold-rolled strip steel prepared by the method for manufacturing the phosphated cold-rolled strip steel is used for manufacturing oil drum containers.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention produces phosphated cold-rolled strip steel based on a continuous annealing line, and adds phosphatization treatment equipment between a leveling withdrawal and straightening machine and an oiling machine of a continuous annealing unit, thereby overcoming the problems of long phosphating treatment time of the current steel plate, high requirements of online phosphating of a production line on fields and the like. Before phosphating, the strip steel is degreased and cleaned, so that oil and impurities on the surface of the strip steel are thoroughly cleaned, the cleanness of the surface of the strip steel is ensured, and a clean and clean matrix is provided for subsequent phosphating. Meanwhile, the strip steel is smooth and continuous, and the phosphating effect and efficiency are improved. The problem that the degreasing and cleaning of the client end cannot completely influence the phosphating effect is solved, the degreasing and cleaning and the phosphating processes are omitted for the client, and the production efficiency is improved.
2. The phosphating film generated by the phosphating treatment has good corrosion resistance and impact resistance. The phytic acid and the methyl methacrylate in the phosphating solution can effectively improve the dispersion uniformity of ions in the phosphating solution, can obviously reduce a contact angle with the surface of steel, and improves the wettability of the surface of a base material and the spreadability of the phosphating solution, thereby improving the forming speed and the uniformity and the compactness of a phosphating film and improving the adhesive force of the film layer and a strip steel matrix. The improvement improves the corrosion resistance of the phosphating film, avoids rusting in the transportation process and enables the product to be supplied in an oilless mode; on the other hand, the improvement of the adhesive force of the phosphating film can prevent the phosphating film from being damaged or falling off in the stamping forming process and improve the shock resistance of the phosphating film. In addition, the phosphating film has self-lubricating function, can reduce friction in the stamping forming process and is beneficial to forming.
3. The phosphating wastewater, waste residue and the like generated in the phosphating treatment are treated in a centralized way by a steel mill, so that the client is prevented from causing serious water pollution, soil pollution and the like due to random discharge of heavy metals and carcinogenic pollutants, and the method has great significance for environmental protection.
4. The invention does not affect the production of the conventional cold rolling product and can treat the phosphatized product and the non-phosphatized product in a collinear way.
Drawings
FIG. 1 is an SEM scanning picture of the steel surface of the phosphated oil drum in example 1;
FIG. 2 is an SEM scanning picture of the steel surface of the phosphated oil drum in example 2;
FIG. 3 is SEM scanning picture of the surface of phosphated steel for oil drums in embodiment 3.
Detailed Description
The chemical components of the phosphatized cold-rolled strip steel comprise the following components in percentage by mass: 0.01-0.10% of C, 0.1-0.6% of Mn0.10%, less than or equal to 0.10% of Si, less than or equal to 0.10% of Al, less than or equal to 0.02% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurity elements.
The manufacturing method of the phosphated cold-rolled strip steel comprises the steps of uncoiling the strip steel, welding, degreasing, cleaning, annealing, leveling, straightening and drawing, and coiling the phosphated strip steel into coils; wherein:
(1) the annealing temperature is 750-850 ℃, the belt speed is 100-160mpm, and the total elongation of flattening and straightening is 1.0-1.5%.
(2) The phosphating treatment equipment consists of a phosphating section, a rinsing section and a hot air drying box and is arranged between the leveling withdrawal and straightening machine and the oiling machine; the phosphating treatment adopts a spray type process, the PH value of phosphating solution is 2-3, the phosphating time is 40-60s, and the temperature of the phosphating solution is 40-50 ℃. The phosphating solution comprises the following components: 60-100g/L of zinc dihydrogen phosphate, 50-80g/L of zinc nitrate, 10-18g/L of phosphoric acid, 1-3g/L of sodium chlorate, 5-7g/L of tartaric acid, 1-2g/L of sodium fluoride, 1-3g/L of hydroxylamine sulfate, 1-3g/L of phytic acid, 1-3g/L of methyl methacrylate and the balance of water.
(3) The phosphating treatment also comprises cleaning and drying after the phosphating treatment; the rinsing adopts a spray type process, and the strip steel is cleaned by deionized water. The drying is carried out by hot air at 80-90 deg.C.
(4) The phosphatized strip steel is directly coiled into coils without being coated with oil.
The invention produces the strip steel based on the continuous annealing unit, and the continuous annealing unit adopts a full-automatic high-efficiency degreasing device, which comprises alkali spraying, alkali brushing, electrolytic cleaning, water brushing, hot water spraying and the like, so that oil and impurities on the surface of the strip steel are thoroughly cleaned.
The phosphatized cold-rolled strip steel prepared by the method can be directly painted and sprayed with plastics. The prepared phosphatized cold-rolled strip steel is used for manufacturing oil drum containers, but not limited to oil drum containers, and can also be used for manufacturing building boards, office supply cabinets, electronic machinery and the like.
The technical scheme of the invention is further explained by taking the production of the steel for the oil drum as an example.
Example 1
The chemical components of the steel for the oil drum are as follows by mass percent: 0.030% of C, 0.40% of Mn, 0.01% of Si, 0.05% of Al, 0.018% of P, 0.0035% of S and the balance of Fe and impurity elements.
The strip steel with the chemical components meeting the requirements is subjected to conventional treatment such as uncoiling, welding, degreasing and cleaning, annealing, leveling, straightening and the like in a continuous annealing line, wherein the annealing temperature is 845 ℃, the strip speed is 145mpm, and the total elongation of leveling and straightening is 1.4%. And (3) after the treatment, entering a phosphating area, and firstly entering a phosphating section for phosphating, wherein the phosphating section adopts a spray type process, the pH value of phosphating solution is 2.2, the phosphating time is 41s, and the temperature of phosphating solution is 42 ℃. The phosphating solution consists of the following components: 80g/L of zinc dihydrogen phosphate, 69g/L of zinc nitrate, 15g/L of phosphoric acid, 1.9g/L of sodium chlorate, 5.8g/L of tartaric acid, 1.5g/L of sodium fluoride, 2.2g/L of hydroxylamine sulfate, 1.7g/L of phytic acid, 2.0g/L of methyl methacrylate and the balance of water.
The phosphatized strip steel enters a rinsing section, the rinsing section adopts a spray type process, and the strip steel is cleaned by deionized water. Then the mixture enters a drying oven, and the drying oven adopts hot air drying at the temperature of 81 ℃. The treated strip steel is directly coiled into a coil without being coated with oil.
Fig. 1 is a scanning picture of SEM of the surface of phosphated steel for oil drums, the surface of steel plate has a phosphate film with good crystallization state and fine iron phosphate crystal particles, and a compact and uniform lamellar phosphate film is formed.
Example 2
The chemical components of the steel for the oil drum are as follows by mass percent: 0.040% of C, 0.20% of Mn, 0.018% of Si, 0.027% of Al, 0.005% of P, 0.011% of S and the balance of Fe and impurity elements.
The strip steel with the chemical components meeting the requirements is subjected to conventional treatment such as uncoiling, welding, degreasing and cleaning, annealing, leveling, straightening and the like in a continuous annealing line, wherein the annealing temperature is 770 ℃, the strip speed is 100mpm, and the total elongation of leveling and straightening and withdrawal is 1.1%. And (3) after the treatment, entering a phosphating area, and firstly entering a phosphating section for phosphating, wherein the phosphating section adopts a spray type process, the pH value of phosphating solution is 2.8, the phosphating time is 49s, and the temperature of phosphating solution is 45 ℃. The phosphating solution consists of the following components: 65g/L of zinc dihydrogen phosphate, 78g/L of zinc nitrate, 11g/L of phosphoric acid, 1.3g/L of sodium chlorate, 6.8g/L of tartaric acid, 1.9g/L of sodium fluoride, 1.1g/L of hydroxylamine sulfate, 1.2g/L of phytic acid, 2.9g/L of methyl methacrylate and the balance of water.
The phosphatized strip steel enters a rinsing section, the rinsing section adopts a spray type process, and the strip steel is cleaned by deionized water. Then the mixture enters a drying box, and the drying box adopts hot air drying at the temperature of 86 ℃. The treated strip steel is directly coiled into a coil without being coated with oil.
Fig. 2 is a scanning picture of SEM of the surface of phosphated oil drum steel, and the phosphated film on the surface of the steel plate is uniform and dense, and has a good crystallization state.
Example 3
The chemical components of the steel for the oil drum are as follows by mass percent: 0.035% of C, 0.30% of Mn, 0.04% of Si, 0.01% of Al, 0.012% of P, 0.0047% of S and the balance of Fe and impurity elements.
The strip steel with the chemical components meeting the requirements is subjected to conventional treatment such as uncoiling, welding, degreasing and cleaning, annealing, leveling, straightening and the like on a continuous annealing line, wherein the annealing temperature is 800 ℃, the strip speed is 120mpm, and the total elongation of leveling and straightening and withdrawal is 1.2%. And (3) after the treatment, the treated mixture enters a phosphating area, and firstly enters a phosphating section for phosphating, wherein the phosphating section adopts a spray type process, the pH value of phosphating solution is 2.5, the phosphating time is 49s, and the temperature of phosphating solution is 48 ℃. The phosphating solution consists of the following components: 97g/L of zinc dihydrogen phosphate, 52g/L of zinc nitrate, 18g/L of phosphoric acid, 3.0g/L of sodium chlorate, 5.4g/L of tartaric acid, 1.2g/L of sodium fluoride, 1.7g/L of hydroxylamine sulfate, 1.8g/L of phytic acid, 2.3g/L of methyl methacrylate and the balance of water.
The phosphatized strip steel enters a rinsing section, the rinsing section adopts a spray type process, and the strip steel is cleaned by deionized water. Then the mixture enters a drying oven, and the drying oven adopts hot air drying at the temperature of 89 ℃. The treated strip steel is directly coiled into a coil without being coated with oil.
FIG. 3 is SEM scanning picture of phosphated steel surface for oil drum, and the phosphated film on the surface of the steel plate is uniform and compact and has good crystallization state.
Finally, it is noted that the above examples and comparative examples are only intended to illustrate the technical solutions of the present invention and are not intended to limit, and although the present invention has been described in detail by the above preferred embodiments, those skilled in the art will understand that various changes in form and detail can be made therein without departing from the scope of the present invention defined by the claims.
Claims (4)
1. A manufacturing method of phosphatized cold-rolled strip steel is characterized by comprising the steps of uncoiling the strip steel, welding, degreasing and cleaning, annealing, flattening, straightening and withdrawing, coiling after phosphating treatment to form coils; wherein:
(1) the phosphating treatment equipment consists of a phosphating section, a rinsing section and a hot air drying box, and is arranged between a leveling withdrawal and straightening machine and an oiling machine, wherein the rinsing adopts a spray type process, the strip steel is cleaned by deionized water, and the drying adopts hot air drying at the temperature of 80-90 ℃;
(2) the phosphating treatment also comprises cleaning and drying after the phosphating treatment, wherein the phosphating solution comprises the following components: 60-100g/L of zinc dihydrogen phosphate, 50-80g/L of zinc nitrate, 10-18g/L of phosphoric acid, 1-3g/L of sodium chlorate, 5-7g/L of tartaric acid, 1-2g/L of sodium fluoride, 1-3g/L of hydroxylamine sulfate, 1-3g/L of phytic acid, 1-3g/L of methyl methacrylate and the balance of water;
(3) the phosphatized strip steel is directly coiled into a coil without being coated with oil;
the chemical components of the strip steel comprise the following components in percentage by mass: 0.01-0.10% of C, 0.1-0.6% of Mn0.10%, less than or equal to 0.10% of Si, less than or equal to 0.10% of Al, less than or equal to 0.02% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurity elements;
in the annealing treatment process, the annealing temperature is 750-850 ℃, the belt speed is 100-160mpm, and the total elongation of leveling and withdrawal-correction is 1.0-1.5%.
2. The method for manufacturing phosphated cold rolled steel strip as claimed in claim 1, characterized in that the phosphating treatment is carried out by a spray process, the phosphating solution has a pH value of 2-3, the phosphating time is 40-60s, and the phosphating solution temperature is 40-50 ℃.
3. The method for manufacturing phosphated cold rolled steel strip as claimed in claim 2, characterized in that the phosphated cold rolled steel strip manufactured by said method is directly subjected to painting and plastic spraying.
4. The method for manufacturing phosphated cold rolled steel strip as claimed in any one of claims 1 to 3, characterized in that the phosphated cold rolled steel strip manufactured by the manufacturing method is used for manufacturing oil drum containers.
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| CN111334786A (en) * | 2020-03-20 | 2020-06-26 | 本钢板材股份有限公司 | Phosphating process method for electrogalvanizing production in northern area |
| CN113584270B (en) * | 2021-08-09 | 2023-03-24 | 新疆八一钢铁股份有限公司 | Process for improving processability of steel for barrel industry |
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| JPS61217584A (en) * | 1985-03-25 | 1986-09-27 | Kobe Steel Ltd | Cold rolled steel sheet having superior suitability to painting |
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| CN109957726A (en) * | 2019-03-29 | 2019-07-02 | 江苏省沙钢钢铁研究院有限公司 | A kind of low-cost high-strength cold rolled annealed plate and manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61217584A (en) * | 1985-03-25 | 1986-09-27 | Kobe Steel Ltd | Cold rolled steel sheet having superior suitability to painting |
| JP2006265682A (en) * | 2005-03-25 | 2006-10-05 | Jfe Steel Kk | Method for producing cold-rolled steel sheet excellent in chemical convertibility |
| CN103060703A (en) * | 2013-01-22 | 2013-04-24 | 宝山钢铁股份有限公司 | 780MPa grade cold rolling biphase strip steel and manufacturing method thereof |
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