CN108220855B - Preparation method of high-strength galvanized steel strip for packaging - Google Patents
Preparation method of high-strength galvanized steel strip for packaging Download PDFInfo
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- CN108220855B CN108220855B CN201810126448.6A CN201810126448A CN108220855B CN 108220855 B CN108220855 B CN 108220855B CN 201810126448 A CN201810126448 A CN 201810126448A CN 108220855 B CN108220855 B CN 108220855B
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- steel strip
- strength
- galvanized steel
- steel
- galvanized
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Classifications
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention aims to solve the problems of two process flows of a galvanized steel strip in the prior art, provides a preparation method of a galvanized steel strip for high-strength packaging, and belongs to the technical field of galvanized steel strip preparation. The method comprises the following steps: cutting the cold-rolled coil into strips after uncoiling the cold-rolled coil to form a steel strip; passing the steel strip through a zinc bath at a constant speed, and heating the steel strip while galvanizing the surface of the steel strip in a zinc solution; blowing the galvanized steel strip by using an air knife to control the thickness of a zinc film; naturally cooling the steel strip obtained in the step 3) by air, and then coiling to obtain the galvanized steel strip. The method adopts a manufacturing process combining steel strip heating and galvanizing, can be completed by only one flow, can also replace a quenching and tempering treatment process required when low-alloy high-strength steel, alloy structural steel or high-quality carbon structural steel is used for manufacturing high-strength packaging steel strips, and has the advantages of low cost, high efficiency, simple process and no pollution.
Description
Technical Field
The invention belongs to the technical field of galvanized steel strip preparation, and particularly relates to a preparation method of a galvanized steel strip for high-strength packaging.
Background
Steel belts for packaging are classified into three major categories, i.e., blue-coated steel belts, painted steel belts, and galvanized steel belts according to the surface state, and the galvanized steel belts are generally manufactured by an electrogalvanizing process.
When the galvanized steel strip for packaging is produced by adopting the electrogalvanizing process method, the production process needs to be realized by two process flows:
the first process is as follows: cold rolling a coiled plate, uncoiling, slitting, removing burrs, heating, bluing and coiling.
And a second process: bluing steel strip-uncoiling-pickling-washing-electrogalvanizing-washing-passivating-drying-coiling.
The conventional production of high-strength galvanized steel strip requires that a cold-rolled coil of a corresponding steel grade is selected as a raw material, the mechanical property of the steel strip is improved through a heating bluing process, so that the steel strip can meet the standard requirement of high-strength packaging steel strip in performance, then the steel strip subjected to heating bluing is used as the raw material, and the surface of the steel strip is galvanized by adopting an electroplating process method, so that the corrosion resistance of the surface of the steel strip is improved. From the above process flow for producing the galvanized steel strip for high-strength packaging, it can be seen that: the traditional production of high-strength galvanized steel strip for packaging is completed through two process flows, the first process flow is to improve the mechanical property of the steel strip by heating and bluing, because the steel strip after cold rolling has a work hardening phenomenon, the strength of the steel strip is very high, but the elongation is very low, the steel strip is very easy to break and can not meet the performance requirement of the high-strength steel strip for packaging, and therefore, the mechanical property of the steel strip needs to be improved by the bluing heating process, so that the performance requirement of the high-strength steel strip for packaging can be met. And after the mechanical property of the steel strip meets the standard requirement, performing a second process, namely an electrogalvanizing process, to galvanize the surface of the steel strip so that the steel strip has certain surface corrosion resistance.
From the above, it can be seen that: the electrogalvanizing process of the packaging steel belt is complex, the production cost is high, the production efficiency is low, and the environmental protection problem is difficult to solve.
Disclosure of Invention
The invention aims to solve the problems of two process flows of a galvanized steel strip in the prior art, and provides a preparation method of a galvanized steel strip for high-strength packaging. The method adopts a manufacturing process combining steel strip heating and galvanizing, can be completed by only one flow, can also replace the quenching and tempering (quenching and tempering) process required by the manufacturing of high-strength packaging steel strips by low-alloy high-strength steel, alloy structural steel or high-quality carbon structural steel, and has the advantages of low cost, high efficiency, simple process and no pollution.
A preparation method of a galvanized steel strip for high-strength packaging comprises the following steps:
1) cutting the cold-rolled coil into strips after uncoiling the cold-rolled coil to form a steel strip;
2) passing the steel strip through a zinc bath at a constant speed, and heating the steel strip while galvanizing the surface of the steel strip in a zinc solution;
3) blowing the galvanized steel strip by using an air knife to control the thickness of a zinc film;
4) naturally cooling the steel strip obtained in the step 3) by air, and then coiling to obtain the galvanized steel strip.
Further, the cold-rolled coil plate comprises carbon structural steel, low-alloy high-strength steel and alloy structural steel; preferably, the tensile strength of the cold-rolled coil is 950MPa-1150 MPa;
further, the speed of the steel strip passing through the zinc tank is 5m/min-50 m/min;
further, heating the steel strip to 430-630 ℃;
further, the thickness of the zinc film ranges from 5 mu m to 12 mu m;
further, the steel strip is naturally air-cooled to normal temperature or room temperature.
Compared with the prior art, the invention has the advantages that:
1. because of the work hardening phenomenon in the cold rolling process, the cold-rolled steel strip has high tensile strength and low elongation, and cannot meet the performance requirement of the high-strength packaging steel strip, and the steel strip needs to be heated and softened. The invention adopts the cold-rolled coil plate made of carbon structural steel, high-quality carbon structural steel, low-alloy high-strength steel, alloy structural steel and the like as raw materials, directly carries out hot galvanizing on the surface of a steel strip without adopting early-stage heat treatment, and simultaneously heats and softens the steel strip by utilizing the temperature of zinc liquid; the high-strength galvanized steel strip for packaging, which is produced by the method, has stable mechanical properties, meets the performance requirements of the high-strength steel strip for packaging, has a firm and compact zinc layer on the surface of the steel strip, and has extremely strong corrosion resistance, and the corrosion resistance of the high-strength galvanized steel strip for packaging is improved by 5-10 times compared with that of the high-strength galvanized steel strip for packaging, which is produced by an electrogalvanizing process method.
2. The traditional method for producing the high-strength galvanized steel strip for packaging by adopting the electrogalvanizing process needs two processes, but the process method for producing the high-strength galvanized steel strip for packaging can be finished by only one process. The method can also replace the quenching and tempering (quenching and tempering) process required by manufacturing the high-strength packaging steel belt by using low-alloy high-strength steel, alloy structural steel or high-quality carbon structural steel, and has the advantages of low cost, high efficiency, simple process and no pollution. The steel strip produced by the method has the mechanical properties that the tensile strength is not less than 930MPa and the elongation is more than 8 percent, and completely meets the requirements of industrial high-strength galvanized steel strips for packaging.
Detailed Description
Example 1
A preparation method of a galvanized steel strip for high-strength packaging comprises the following steps:
1) uncoiling a carbon structural steel cold-rolled coil with the tensile strength of 950MPa, and slitting the coil into steel strips;
2) enabling the steel strip to pass through a zinc tank at a constant speed of 50m/min, and heating the steel strip to 580-630 ℃ while galvanizing the surface of the steel strip in a zinc solution;
3) blowing the galvanized steel strip by using an air knife to control the thickness of a zinc film to be 5 mu m;
4) naturally cooling the steel strip obtained in the step 3) to room temperature, and coiling to obtain the galvanized steel strip.
Through detection, the mechanical property of the galvanized steel strip prepared by the embodiment is that the tensile strength is 930MPa, the elongation is more than 12%, and the corrosion resistance index is as follows: the salt spray resistance test time is more than 30 hours.
Comparative example 1
A preparation method of a galvanized steel strip for high-strength packaging comprises the following steps:
1) uncoiling a carbon structural steel cold-rolled coil with the performance index of 950MPa, and slitting the coil into steel strips;
2) heating the steel belt to 580-630 ℃, and coiling after heating and bluing;
3) uncoiling the coiled bluing steel strip, and then enabling the steel strip to pass through a zinc tank at a constant speed of 50m/min to enable the surface of the steel strip to be electrogalvanized in electroplating solution;
4) the thickness of a zinc film of the galvanized steel strip is 3 mu m;
4) naturally cooling the steel strip obtained in the step 3) to room temperature, and coiling to obtain the galvanized steel strip.
Through detection, the mechanical property of the galvanized steel strip prepared by the comparative example is 930MPa of tensile strength, the elongation is more than 12%, and the corrosion resistance indexes are as follows: the salt spray resistance test time is more than 6 hours.
Example 2
A preparation method of a galvanized steel strip for high-strength packaging comprises the following steps:
1) uncoiling a low-alloy high-strength steel cold-rolled coil with the performance index of 1050MPa, and slitting the coil into steel strips;
2) enabling the steel strip to pass through a zinc tank at a constant speed of 25m/min, and heating the steel strip to 430-480 ℃ while galvanizing the surface of the steel strip in a zinc solution;
3) blowing the galvanized steel strip by using an air knife to control the thickness of a zinc film to be 9 mu m;
4) naturally cooling the steel strip obtained in the step 3) to normal temperature, and coiling to obtain the galvanized steel strip.
Through detection, the mechanical property of the galvanized steel strip prepared by the embodiment is that the tensile strength is 980MPa, the elongation is more than 10%, and the corrosion resistance indexes are as follows: the salt spray resistance test time is more than 45 hours.
Example 3
A preparation method of a galvanized steel strip for high-strength packaging comprises the following steps:
1) uncoiling an alloy structural steel cold-rolled coil with the performance index of 1150MPa, and slitting the coil into steel strips;
2) enabling the steel strip to pass through a zinc tank at a constant speed of 5m/min, and heating the steel strip to 530-580 ℃ while galvanizing the surface of the steel strip in a zinc solution;
3) blowing the galvanized steel strip by using an air knife to control the thickness of a zinc film to be 12 mu m;
4) naturally cooling the steel strip obtained in the step 3) to normal temperature, and coiling to obtain the galvanized steel strip.
Through detection, the mechanical property of the galvanized steel strip prepared by the embodiment is tensile strength 1080MPa, the elongation is more than 8%, and the corrosion resistance index is as follows: the salt spray resistance test time is more than 60 hours.
Claims (3)
1. A preparation method of a galvanized steel strip for high-strength packaging is characterized by comprising the following steps:
1) cutting the cold-rolled coil into strips after uncoiling the cold-rolled coil to form a steel strip;
the cold-rolled coil comprises carbon structural steel, low-alloy high-strength steel and alloy structural steel;
the tensile strength of the cold-rolled coil is 950MPa-1150 MPa;
2) passing the steel strip through a zinc bath at a constant speed, and heating the steel strip while galvanizing the surface of the steel strip in a zinc solution;
the speed of the steel strip passing through the zinc tank is 5m/min-50 m/min;
heating the steel strip to 430-630 ℃;
3) blowing the galvanized steel strip by using an air knife to control the thickness of a zinc film;
4) naturally cooling the steel strip obtained in the step 3) by air, and then coiling to obtain the galvanized steel strip.
2. The method for preparing the high-strength galvanized steel strip for the packages according to claim 1, wherein the thickness of the zinc film is 5-12 μm.
3. The method of claim 1, wherein the steel strip is naturally air-cooled to normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126448.6A CN108220855B (en) | 2018-02-08 | 2018-02-08 | Preparation method of high-strength galvanized steel strip for packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126448.6A CN108220855B (en) | 2018-02-08 | 2018-02-08 | Preparation method of high-strength galvanized steel strip for packaging |
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| Publication Number | Publication Date |
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| CN108220855A CN108220855A (en) | 2018-06-29 |
| CN108220855B true CN108220855B (en) | 2020-04-24 |
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| CN201810126448.6A Active CN108220855B (en) | 2018-02-08 | 2018-02-08 | Preparation method of high-strength galvanized steel strip for packaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111593284A (en) * | 2020-06-03 | 2020-08-28 | 无锡市方正金属捆带有限公司 | Continuous hot-dip galvanizing production method for multiple steel strips |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101981219A (en) * | 2008-05-14 | 2011-02-23 | 安赛乐米塔尔研究与发展有限责任公司 | Method for producing a coated metal strip having an improved appearance |
| DE102015200764A1 (en) * | 2014-01-22 | 2015-07-23 | Sms Siemag Ag | Process and installation for hot-dip coating hot-rolled steel strip |
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2018
- 2018-02-08 CN CN201810126448.6A patent/CN108220855B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101981219A (en) * | 2008-05-14 | 2011-02-23 | 安赛乐米塔尔研究与发展有限责任公司 | Method for producing a coated metal strip having an improved appearance |
| DE102015200764A1 (en) * | 2014-01-22 | 2015-07-23 | Sms Siemag Ag | Process and installation for hot-dip coating hot-rolled steel strip |
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| CN108220855A (en) | 2018-06-29 |
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