CN111962001A - Production and surface quality control method of cold-rolled thick-zinc-layer hot-dip pure-zinc steel strip - Google Patents
Production and surface quality control method of cold-rolled thick-zinc-layer hot-dip pure-zinc steel strip Download PDFInfo
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- CN111962001A CN111962001A CN202010938210.0A CN202010938210A CN111962001A CN 111962001 A CN111962001 A CN 111962001A CN 202010938210 A CN202010938210 A CN 202010938210A CN 111962001 A CN111962001 A CN 111962001A
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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
- C23C2/04—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
- C23C2/34—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 relates to a method for producing cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling surface quality, which adopts a full-radiation American steel combined hot-dip galvanizing production process, depends on a continuous hot-dip galvanizing unit of a vertical annealing furnace, and can continuously produce 350g/m with uniform zinc layer weight and good surface quality by optimizing the processes of strip steel tapping temperature, zinc pot and air knife parameters, strip steel speed, finishing machine parameters and the like2The thick zinc layer hot dip galvanized steel strip meets the requirements of the standards such as GB/T2518, EN10346, JIS G3302 and the like on the weight of a zinc layer, has no thick edge, reduces the generation of bright spots on the surface of a steel plate, optimizes the product type, improves the product competitiveness, and has good market popularization value and social benefit.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for producing a cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling the surface quality.
Background
Hot dip galvanizing, also known as hot dip galvanizing, is a method of dipping a pretreated steel strip or steel member into a molten zinc bath to obtain a metal coating. The cold-rolled hot-dip galvanized steel strip is a galvanized product produced on a continuous hot-dip galvanizing production line by using a cold-rolled substrate as a raw material, and the working procedures mainly comprise the following steps: cold rolling a substrate → alkaline degreasing → continuous annealing → hot dipping zinc → post-plating treatment → product inspection, etc.
The hot galvanized plate is mainly used outdoors, and the corrosion environment is severe, so that a thicker zinc layer is required. Further, when electrochemical corrosion occurs, the zinc plating layer is an anode protecting the iron substrate as a cathode, so that the thicker the plating layer is, the longer the service life is. And 350g/m2The hot-dip galvanized product with the thick zinc layer has good corrosion resistance, and can be used for comprehensive pipe galleries, building structural members, drainage system pipelines, traffic guardrail systems, railway carriage top covers and side walls, large steel plate warehouses, livestock raising and agricultural machinery equipment and the like. However, the problems of uneven zinc layer weight control, thick edges, surface bright spots and the like of the thick zinc layer hot galvanizing product affect the market popularization of the thick zinc layer product, and the customer requirements cannot be better met.
CN109735783A discloses a process for producing super-thick zinc layer hot-dip galvanized steel strip, which obtains 720g/m by optimizing a zinc pot, an air knife and the running speed of the steel strip2A super-thick zinc layer hot-dip galvanized steel strip. Compared with a cold-rolled substrate, the hot-rolled pickled plate adopted by the process substrate has the advantages that the control precision of the thickness and the shape of the steel plate is low, the roughness is higher, the uniformity and the precision of the coating of the steel plate are not favorably controlled, an optimization method for improving the surface quality is not available, the production cost is influenced, and the higher requirements of customers on the use of products cannot be met.
Disclosure of Invention
The invention aims to provide a method for producing a cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling the surface quality.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for producing cold-rolled thick zinc layer hot-dip pure zinc steel band and controlling surface quality is characterized in that 350g/m is obtained by optimizing the temperature of a steel band outlet furnace, parameters of a zinc pot and an air knife, the speed of the steel band and the parameters of a finishing machine2The thick zinc layer hot galvanizing steel strip has the thickness specification of 0.8-1.5 mm and the width specification of 1150-1450 mm.
The strip steel discharging temperature is 455-485 ℃; specifically, the tapping temperature of thin gauge strip steel is higher, and the tapping temperature of thick gauge strip steel is lower. When the thickness of the strip steel is not less than 0.80 mm and not more than 0.90mm, the tapping temperature of the strip steel is 475 +/-10 ℃; when the thickness of the strip steel is more than 0.90 and less than or equal to 1.50mm, the tapping temperature of the strip steel is 465 +/-10 ℃.
The zinc pot parameters comprise: the temperature of the zinc liquid is 452-458 ℃; the Al element content in the zinc liquid is 0.20-0.24%, and the Fe element content in the zinc liquid is less than or equal to 0.015%; unit tension of 15-30N/mm for zinc plating section2(ii) a The insertion amount of the zinc pot correcting roller is 40-60 mm; the distance between the baffle plates at the transmission side and the operation side edge part of the zinc pot is 1-5 mm from the edge part of the strip steel. Preferably, the temperature of the zinc liquid in the parameters of the zinc pot is 455 ℃, the content of Al element in the zinc liquid is 0.22 percent, and the unit tension of a galvanizing segment is 27N/mm2。
The air knife parameters include: the distance between the upper air knife lip and the strip steel is 12-16 mm, and the distance between the lower air knife lip and the strip steel is 12-16 mm; the jet medium of the air knife is nitrogen, and the pressure of the nitrogen is 120-150 mbar; the angle of the upper air knife is-1-0 degrees, and the angle of the lower air knife is-1-0 degrees; the height of the air knife is 180-230 mm. Preferably, the air knife parameters include an upper air knife angle of-1 degrees and a lower air knife angle of-1 degrees; the height of the air knife is 200 mm.
The speed of the strip steel is 100-140 m/min.
The parameters of the finishing machine comprise: the finishing elongation is 1.5-1.8%, and the rolling force is 3000-6000 kN.
The invention has the following beneficial effects:
the invention relates to a method for producing cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling surface quality, which adopts a full-radiation American steel combined hot-dip galvanizing production process, depends on a continuous hot-dip galvanizing unit of a vertical annealing furnace, and can continuously produce 350g/m with uniform zinc layer weight and good surface quality by optimizing the processes of strip steel tapping temperature, zinc pot and air knife parameters, strip steel speed, finishing machine parameters and the like2The thick zinc layer hot dip galvanized steel strip meets the requirements of GB/T2518, EN10346, JISG3302 and other standards on the weight of a zinc layer, has no thick edge, reduces the generation of bright spots on the surface of the steel plate, optimizes the product type, improves the product competitiveness, and has good market popularization value and social benefit.
Drawings
FIG. 1 is a drawing showing a sampling position of a weight sample of a plated coating of the present invention.
FIG. 2 is a surface effect diagram of a steel coil produced by the method of the present invention.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
The method adopts the steel plate raw material as a cold-rolled substrate, adopts the full-radiation American steel combined hot galvanizing production process, relies on a continuous hot galvanizing unit of a vertical annealing furnace, and has the production flow mainly comprising the following steps: feeding a cold-rolled substrate, uncoiling → welding with a narrow lap welder → degreasing (removing solid particle mixture such as grease and iron powder on the surface of strip steel by a degreasing agent) → continuous annealing → hot galvanizing → finishing, straightening (improving the shape and the surface quality and the like) → chemical treatment after plating (carrying out passivation prevention, environment-friendly trivalent chromium passivation, chromium-free passivation and the like according to the needs of customers) → surface quality inspection → finished product coiling, weighing → packaging.
Wherein 350g/m is obtained by optimizing the temperature of the strip steel discharge furnace, the parameters of a zinc pot and an air knife, the speed of the strip steel and the parameters of a finishing machine2The thick zinc layer cold rolling hot plating pure zinc steel belt improves the surface quality of the steel belt at the same time.
Example 1
The thickness of the produced steel strip is 0.8mm, and the width of the produced steel strip is 1300 mm. The strip steel tapping temperature is 480 ℃, the zinc liquid temperature is 455 ℃, the Al content in the zinc liquid is 0.22% (mass fraction), the Fe content is 0.007% (mass fraction), the distance between the upper air knife lip and the lower air knife lip and the strip steel is 14mm, the nitrogen pressure of the air knife is 135mbar, the angles of the upper air knife and the lower air knife are both-1 degrees, the height of the air knife is 200mm, the insertion amount of the zinc pot correction roller is 40mm, the distance between the baffle plates at the transmission side and the operation side edge part of the zinc pot and the edge part of the strip steel is 2mm, and the unit tension of a galvanized2The speed of the galvanized section strip steel is 140m/min, the finishing elongation is 1.5 percent, and the rolling force is 6000 kN.
Example 2
The thickness of the produced steel strip is 1.2mm, and the width is 1450 mm. The strip steel tapping temperature is 470 ℃, the zinc liquid temperature is 458 ℃, the Al content in the zinc liquid is 0.24% (mass fraction), the Fe content is 0.010% (mass fraction), the distance between the upper air knife lip and the lower air knife lip and the strip steel is 12mm, the nitrogen pressure of the air knife is 120mbar, the angles of the upper air knife and the lower air knife are both-1 degrees, the height of the air knife is 230mm, the insertion amount of a zinc pot correction roller is 60mm, the distance between a zinc pot transmission side baffle and an operation side edge part baffle and the edge part of the strip steel is 5mm, and the unit tension of a galvanized section is 30N2The speed of the galvanized section strip steel is 120m/min, the finishing elongation is 1.8 percent, and the rolling force is 5000 kN.
Example 3
The thickness of the produced steel strip is 1.5mm, and the width is 1150 mm. The strip steel tapping temperature is 460 ℃, the zinc liquid temperature is 452 ℃, the Al content in the zinc liquid is 0.20% (mass fraction), the Fe content is 0.015% (mass fraction), the distance between the upper air knife lip and the lower air knife lip and the strip steel is 16mm, the nitrogen pressure of the air knife is 150mbar, the angles of the upper air knife and the lower air knife are both 0 degrees, the height of the air knife is 220mm, the insertion amount of the zinc pot correction roller is 50mm, and the transmission side edge and the operation side edge of the zinc pot are blockedThe distance between the plate and the edge of the strip steel is 4mm, and the unit tension of the galvanized section is 20N/mm2The speed of the galvanized section strip steel is 100m/min, the finishing elongation is 1.8 percent, and the rolling force is 3000 kN.
Test results
The galvanized products corresponding to the examples 1, 2 and 3 are respectively coiled according to GB/T2518, EN10346 and JISG3302 standards
The sample piece and the sampling position are shown in figure 1, wherein b represents the width of a steel plate or a steel strip, the weight of a zinc layer is detected by a chemical method, and the specific result is shown in table 1.
TABLE 1 Zinc layer weight
TABLE 2 Standard 350g/m2Zinc layer weight requirement
The national standard, European standard and daily standard are 350g/m2The zinc layer weight requirements are shown in table 2. The weight detection result of the zinc layer shows that 350g/m produced by the method of the invention2The weight of the zinc layer of the thick zinc layer galvanized steel coil meets the requirements of various standards. Meanwhile, the surface quality of the steel coil is good, and particularly as shown in fig. 2, the surface bright spots are reduced greatly and almost eliminated.
Claims (5)
1. A method for producing cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling surface quality is characterized in that 350g/m is obtained by optimizing the temperature of a strip steel outlet furnace, parameters of a zinc pot and an air knife, the speed of the strip steel and the parameters of a finishing machine2The thick zinc layer hot galvanizing steel strip has the thickness specification of 0.8-1.5 mm;
the strip steel discharging temperature is 455-485 ℃;
the zinc pot parameters comprise: the temperature of the zinc liquid is 452-458 ℃; the Al element content in the zinc liquid is 0.20-0.24%, and the Fe element content in the zinc liquid is less than or equal to 0.015%; unit tension of 15-30N/mm for zinc plating section2(ii) a The insertion amount of the zinc pot correcting roller is 40-60 mm; the distance between the baffle plates at the transmission side and the operation side edge part of the zinc pot is 1-5 mm from the edge part of the strip steel;
the air knife parameters include: the distance between the upper air knife lip and the strip steel is 12-16 mm, and the distance between the lower air knife lip and the strip steel is 12-16 mm; the jet medium of the air knife is nitrogen, and the pressure of the nitrogen is 120-150 mbar; the angle of the upper air knife is-1-0 degrees, and the angle of the lower air knife is-1-0 degrees; the height of the air knife is 180-230 mm;
the speed of the strip steel is 100-140 m/min;
the parameters of the finishing machine comprise: the finishing elongation is 1.5-1.8%, and the rolling force is 3000-6000 kN.
2. The method for producing the cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling the surface quality as claimed in claim 1, wherein when the thickness of the strip steel is more than or equal to 0.80 and less than or equal to 0.90mm, the tapping temperature of the strip steel is 475 +/-10 ℃; when the thickness of the strip steel is more than 0.90 and less than or equal to 1.50mm, the tapping temperature of the strip steel is 465 +/-10 ℃.
3. The method for producing a cold-rolled thick zinc layer hot-dip galvanized pure zinc steel strip and controlling the surface quality as claimed in claim 1, wherein the temperature of the molten zinc in the zinc pot parameters is 455 ℃, the content of Al element in the molten zinc is 0.22%, and the unit tension of the galvanized section is 27N/mm2。
4. The method for producing a cold-rolled thick zinc layer hot-dip pure zinc steel strip and controlling the surface quality as claimed in claim 1, wherein the air knife parameters are such that the upper air knife angle is-1 ° and the lower air knife angle is-1 °; the height of the air knife is 200 mm.
5. The method for producing a cold-rolled thick zinc hot-dip galvanized pure zinc steel strip according to claim 1, characterized in that said 350g/m obtained is2Width specification of thick zinc layer hot galvanizing steel stripIs 1150-1450 mm.
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| CN202010938210.0A CN111962001A (en) | 2020-09-09 | 2020-09-09 | Production and surface quality control method of cold-rolled thick-zinc-layer hot-dip pure-zinc steel strip |
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| CN202010938210.0A CN111962001A (en) | 2020-09-09 | 2020-09-09 | Production and surface quality control method of cold-rolled thick-zinc-layer hot-dip pure-zinc steel strip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430478A (en) * | 2021-05-31 | 2021-09-24 | 武汉钢铁有限公司 | Method for eliminating zinc corrugation defect of alloyed hot-dip galvanized steel sheet |
| CN114034701A (en) * | 2021-11-10 | 2022-02-11 | 山东钢铁集团日照有限公司 | Method for detecting zinc slag content in hot galvanizing zinc liquid |
| CN114592160A (en) * | 2022-03-08 | 2022-06-07 | 吉林龙翔新型材料有限公司 | Continuous hot galvanizing process for ultrathin galvanized substrate for color coating |
| CN114633009A (en) * | 2022-03-30 | 2022-06-17 | 鞍钢股份有限公司 | Method for reducing strip breakage of narrow lap weld of aluminum-zinc plated product |
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| CN109735783A (en) * | 2019-01-31 | 2019-05-10 | 日照宝华新材料有限公司 | A kind of technique producing super thick zinc layers hot-dip galvanized steel strip |
| CN110565003A (en) * | 2019-08-30 | 2019-12-13 | 日照钢铁控股集团有限公司 | Production process of hot-dip galvanized sheet without zinc flower and with 0.9-2.5mm thick zinc layer |
| CN111378916A (en) * | 2020-04-15 | 2020-07-07 | 山东钢铁集团日照有限公司 | Surface quality control method for thick zinc layer of high-strength hot-dip galvanized steel strip |
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| KR20100045287A (en) * | 2008-10-23 | 2010-05-03 | 현대하이스코 주식회사 | Continuous galvanizing line apparatus for providing high surface quality and manufacturing method using the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430478A (en) * | 2021-05-31 | 2021-09-24 | 武汉钢铁有限公司 | Method for eliminating zinc corrugation defect of alloyed hot-dip galvanized steel sheet |
| CN114034701A (en) * | 2021-11-10 | 2022-02-11 | 山东钢铁集团日照有限公司 | Method for detecting zinc slag content in hot galvanizing zinc liquid |
| CN114592160A (en) * | 2022-03-08 | 2022-06-07 | 吉林龙翔新型材料有限公司 | Continuous hot galvanizing process for ultrathin galvanized substrate for color coating |
| CN114633009A (en) * | 2022-03-30 | 2022-06-17 | 鞍钢股份有限公司 | Method for reducing strip breakage of narrow lap weld of aluminum-zinc plated product |
| CN114633009B (en) * | 2022-03-30 | 2023-06-20 | 鞍钢股份有限公司 | Method for reducing strip breakage of narrow lap joint weld of aluminum-zinc plated product |
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Application publication date: 20201120 |