CN115261703A - Manufacturing method of high-corrosion-resistance steel plate for photovoltaic support - Google Patents
Manufacturing method of high-corrosion-resistance steel plate for photovoltaic support Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 58
- 238000007747 plating Methods 0.000 claims abstract description 36
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000011701 zinc Substances 0.000 claims abstract description 34
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 34
- 239000002253 acid Substances 0.000 claims abstract description 33
- 238000005246 galvanizing Methods 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000010924 continuous production Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 46
- 238000001816 cooling Methods 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 26
- 230000007797 corrosion Effects 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 15
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000004381 surface treatment Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 6
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000002161 passivation Methods 0.000 claims description 6
- 239000008237 rinsing water Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 15
- 238000006467 substitution reaction Methods 0.000 abstract description 5
- 238000005406 washing Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket. The method adopts an acid plating continuous process, and the galvanized substrate comprises the following chemical components in percentage by weight: 0.050 to 0.080%, si:0.10 to 0.20%, mn:0.9 to 1.25%, P: less than or equal to 0.019 percent, S: less than or equal to 0.003 percent, als:0.020 to 0.040%, ti:0.010 to 0.040%, nb:0.015 to 0.030 percent, and the balance of Fe and inevitable impurities; the chemical components of the zinc liquid used for galvanizing are Al: 5-6.5%, mg: 2.5-2.8%, fe: less than or equal to 0.03 percent, and the balance of zinc and inevitable impurities. The steel plate produced by the manufacturing method can realize the application and substitution of high strength thinning and thick zinc layer of the photovoltaic bracket, and reduces the material consumption and material cost for producing the photovoltaic bracket while ensuring the reliability and stability of the photovoltaic bracket and prolonging the service life.
Description
Technical Field
The invention relates to the technical field of corrosion-resistant steel manufacturing, in particular to a manufacturing method of a high-corrosion-resistance steel plate for a photovoltaic bracket.
Background
The photovoltaic support is one of important accessories of photovoltaic power generation in the field of new energy industry, and the requirements of the photovoltaic support on manufacturing materials are as follows: the steel structure is firm and reliable, and can bear severe environments such as wind, snow load and other external effects; it is required to have strong corrosion resistance and guarantee a service life of at least 25 years. Therefore, the material cost and the using effect are optimized, and the maintenance is almost free, which is an important factor to be considered when the photovoltaic bracket scheme is made.
The method commonly adopted by the existing steel for the photovoltaic bracket is to adopt Q235+ hot galvanized steel parts, the thickness of the material is generally required to be more than 3.5mm in order to ensure the bearing capacity of the bracket, and the weight of a zinc coating is generally required to be 550g/m in order to ensure the corrosion resistance2The above. In addition, the galvanizing process of the steel for the photovoltaic bracket mostly adopts a hot dip galvanizing process or a continuous galvanizing process, the hot dip galvanizing process has heavy pollution and is unfavorable for environment, the control difficulty of the thick-specification continuous galvanizing process is high, and the corrosion prevention of the cut section is restricted after the edge cutting.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket. The steel plate produced by the manufacturing method can realize the application and substitution of high strength thinning and thick zinc layer of the photovoltaic bracket, and reduces the material consumption and material cost for producing the photovoltaic bracket while ensuring the reliability and stability of the photovoltaic bracket and prolonging the service life.
In order to achieve the aim, the invention discloses a manufacturing method of a high-corrosion-resistance steel plate for a photovoltaic bracket, which adopts an acid plating continuous process, wherein the adopted galvanized substrate comprises the following chemical components in percentage by weight: 0.050 to 0.080%, si:0.10 to 0.20%, mn:0.9 to 1.25%, P: less than or equal to 0.019 percent, less than or equal to 0.003 percent of S, A1S:0.020 to 0.0405%, ti:0.010 to 0.040%, nb:0.015 to 0.030 percent, and the balance of Fe and inevitable impurities; the chemical components of the zinc liquid used for galvanizing are Al: 5-6.5%, mg:2.5 to 2.8 percent of Fe, less than or equal to 0.03 percent of Fe, and the balance of zinc and inevitable impurities.
Preferably, the manufacturing method comprises the steps of carrying out acid pickling, leveling, heating, galvanizing, cooling after plating and surface treatment on the galvanized substrate through an acid plating continuous process to obtain a plated plate, namely the steel plate for the high-corrosion-resistance photovoltaic bracket.
Preferably, in the acid washing process, the free acidity of the acid tank is 80-90 g/L, the total acidity is 220-230 g/L, the acid washing temperature is 85-95 ℃, the rinsing water temperature is 45-55 ℃, and the conductivity is 30-50 (ms/cm).
Preferably, the flattening process adopts a high reduction flattening process before and after plating.
Preferably, the process parameters of the high reduction flattening process are set as follows: the elongation percentage of the scale breaker is 0.5 percent, the elongation percentage of the temper mill is 2.0-2.8 percent, the elongation percentage of the plated finishing mill is 2.5-3.5 percent, and the elongation percentage of the tension leveler is 0.3 percent.
Preferably, in the heating process, the time of the steel plate in the furnace is about 20 to 40 seconds, the dew point of an induction heating furnace is less than minus 35 ℃, the furnace pressure is 0.4 to 1.0mbar, the hydrogen-nitrogen ratio is 6 to 11 percent, the outlet temperature of the heating section is 510 to 550 ℃, the outlet temperature of the soaking section is 510 to 530 ℃, and the outlet temperature of the rapid cooling is 450 to 470 ℃.
Preferably, in the galvanizing process, the temperature of the zinc liquid in the zinc pot is controlled to be 450-460 ℃.
Preferably, in the cooling process after plating, the temperature of the strip steel of the first group of fans is 370-390 ℃, the temperature of the top of the cooling tower is less than or equal to 200 ℃, the water quenching cooling adopts immersion cooling, and the temperature of the water quenching outlet is less than or equal to 45 ℃.
Preferably, the surface treatment process comprises chromic acid passivation and/or oiling.
Preferably, the thickness of the steel plate for the high-corrosion-resistance photovoltaic bracket is 1.5-3.0 mm, and the weight of a plating layer is 275g/m2And the yield strength is 400-600 MPa.
Compared with the prior art, the invention has the advantages and positive effects that: a manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket is provided. The manufacturing method is based on the technical configuration of the continuous pickling and galvanizing process, improves the flattening and heating processes by optimizing the component system design of the base material, optimizes the components of the zinc solution and the cooling mode after plating, and can realize the batch production of the zinc-plated steel with the thickness of 1.5-3.0 mm, the yield strength of 400-600 MPa and the coating weight of 275g/m2The high-strength and high-corrosion-resistance steel plate for the photovoltaic support realizes the application and substitution of high-strength thinning and a thick zinc layer of the photovoltaic support, ensures the reliability and stability of the photovoltaic support, prolongs the service life, and reduces the material consumption and the material cost for producing the photovoltaic support. Specifically, the method comprises the following steps:
1) The manufacturing method can stably produce the product with the specification of 1.5-3.0 mm, the product has good surface quality and excellent coating bonding force, and the coating weight is 275g/m2The corrosion-resistant and high-strength steel plate has the red rust area less than 10% after being tested for 22 weeks by a neutral salt spray test, the corrosion resistance is 4-5 times that of a common galvanized product, and the product structure and performance can meet the standard requirements of materials for photovoltaic brackets.
2) The photovoltaic bracket manufactured by the steel material manufactured by the method can realize the application substitution of high strength thinning and thick zinc layer of the photovoltaic bracket, can save the material consumption, can save the alloy cost of a substrate when producing the same high strength grade steel plate, can improve the corrosion resistance of the steel plate by adding the Al and Mg elements of the surface coating, and is 275g/m2The plating layer can replace 550g/m2And the pure zinc layer can effectively reduce the production cost of the steel for the photovoltaic bracket.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It is to be understood, however, that the structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
A manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket adopts an acid plating continuous process, and the adopted galvanized substrate comprises the following chemical components in percentage by weight: 0.050 to 0.080%, si:0.10 to 0.20%, mn:0.9 to 1.25%, P: less than or equal to 0.019%, S less than or equal to 0.003%, als:0.020 to 0.0405%, ti:0.010 to 0.040%, nb:0.015 to 0.030 percent, and the balance of Fe and inevitable impurities; the chemical components of the zinc liquid used for galvanizing are Al: 5-6.5%, mg:2.5 to 2.8 percent of Fe, less than or equal to 0.03 percent of Fe, and the balance of zinc and inevitable impurities. The manufacturing method comprises the steps of carrying out acid pickling, leveling, heating, galvanizing, cooling after plating and surface treatment on the galvanized substrate through an acid plating continuous process to obtain a plated plate, namely the steel plate for the high-corrosion-resistance photovoltaic bracket.
The manufacturing method optimizes the design of the smelting components of the substrate, reduces the addition of alloys with the same strength level, and improves the strength of the steel plate through acid plating double-leveling dislocation strengthening and a heating baking hardening mechanism. Al and Mg elements are added into the zinc liquid, and cooling control is performed after plating, so that the structure of the plating layer is uniform, and the corrosion resistance of the plating layer is improved. Tests show that the method can be used for mass production of the steel plate with the thickness of 1.5-3.0 mm, the yield strength of 400-600 MPa and the yield strength of 275g/m2The high-strength and high-corrosion-resistance steel plate for the photovoltaic support realizes application and substitution of high-strength thinning and thick zinc layer of the photovoltaic support, improves the reliability and stability of the support, prolongs the service life, and reduces the material consumption and material cost for producing the photovoltaic support.
Wherein, in the acid cleaning process, the free acidity of the acid tank is 80-90 g/L, the total acidity is 220-230 g/L, the acid cleaning temperature is 85-95 ℃, the rinsing water temperature is 45-55 ℃, and the conductivity is 30-50 (ms/cm). The surface of the steel plate can be fully reduced by optimizing the pickling temperature and concentration and increasing the temperature of the steel plate before plating.
Wherein, in the leveling process, a high reduction leveling process is adopted before and after plating. Specifically, the technological parameters of the high reduction flattening process are set as follows: the elongation percentage of the scale breaker is 0.5 percent, the elongation percentage of the temper mill is 2.0-2.8 percent, the elongation percentage of the plated finishing mill is 2.5-3.5 percent, and the elongation percentage of the tension leveler is 0.3 percent.
Wherein, in the heating process, the time of the steel plate in the furnace is about 20-40 s, the dew point of the induction heating furnace is less than-35 ℃, the furnace pressure is 0.4-1.0 mbar, the hydrogen-nitrogen ratio is 6-11%, the outlet of the heating section is 510-550 ℃, the outlet plate temperature of the soaking section is 510-530 ℃, and the outlet plate temperature of the rapid cooling section is 450-470 ℃.
Wherein, in the galvanizing process, the temperature of the zinc liquid in the zinc pot is controlled between 450 and 460 ℃.
In order to ensure that the surface of the steel plate is fully reduced, in the cooling process after plating, the temperature of the strip steel of the first group of fans is 370-390 ℃, the temperature of the top of the cooling tower is less than or equal to 200 ℃, the water quenching cooling adopts immersion cooling, and the temperature of the water quenching outlet is less than or equal to 45 ℃.
Wherein the surface treatment process comprises chromic acid passivation and/or oiling.
Example 1
A manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket comprises the steps of carrying out acid pickling, leveling, heating, galvanizing, cooling after plating and surface treatment on a galvanized substrate through an acid plating continuous process to obtain a plated plate, namely the steel plate for the high-corrosion-resistance photovoltaic bracket. The galvanized substrate comprises the following chemical components in percentage by weight: 0.050%, si:0.10%, mn:0.9%, P:0.019%, S:0.003%, A1s: 0.020%, ti:0.010%, nb:0.015%, the balance being Fe and unavoidable impurities; the chemical components of the zinc liquid used for galvanizing are Al:5%, mg:2.5%, fe:0.03%, and the balance of zinc and inevitable impurities. Wherein in the acid washing process, the free acidity of the acid tank is 80g/L, the total acidity is 220g/L, the acid washing temperature is 85 ℃, the rinsing water temperature is 45 ℃, and the conductivity is 30ms/cm; in the flattening process, a large reduction flattening process is adopted before and after plating, and the specific process parameters are set as follows: the elongation of the scale breaker is 0.5 percent, the elongation of the leveler is 2.0 percent, the elongation of the coated finisher is 2.5 percent, and the elongation of the tension leveler is 0.3 percent; in the heating process, the time of the steel plate in the furnace is about 20s, the dew point of the induction heating furnace is less than-35 ℃, the furnace pressure is 0.4mbar, the hydrogen-nitrogen ratio is 6 percent, the outlet of the heating section is 510 ℃, the outlet plate temperature of the soaking section is 510 ℃, and the outlet plate temperature of the rapid cooling section is 450 ℃; in the galvanizing process, the temperature of zinc liquid in a zinc pot is controlled at 450 ℃; in the cooling process after plating, the strip steel temperature of the first group of fans is 370 ℃, the tower top temperature of the cooling tower is 200 ℃, the water quenching cooling adopts immersion cooling,the temperature of a water quenching outlet is 45 ℃; the surface treatment process comprises chromic acid passivation and oiling. Tests prove that the steel plate prepared by the method has the thickness of 1.5mm, the yield strength of 400MPa and the coating weight of 275g/m2。
Example 2
A manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket comprises the steps of carrying out acid pickling, leveling, heating, galvanizing, cooling after plating and surface treatment on a galvanized substrate through an acid plating continuous process to obtain a plated plate, namely the steel plate for the high-corrosion-resistance photovoltaic bracket. The galvanized substrate comprises the following chemical components in percentage by weight: 0.080%, si:0.20%, mn:1.25%, P:0.01%, S:0.002%, als:0.040%, ti:0.040%, nb:0.030%, the balance being Fe and unavoidable impurities; the chemical components of the zinc liquid used for galvanizing are A1:6.5%, mg:2.8%, fe:0.02% and the balance of zinc and inevitable impurities. Wherein in the acid washing process, the free acidity of an acid tank is 90g/L, the total acidity is 230g/L, the acid washing temperature is 95 ℃, the rinsing water temperature is 55 ℃, and the conductivity is 50ms/cm; in the leveling process, a high reduction rate leveling process is adopted before and after plating, and the specific process parameters are set as follows: the elongation of the scale breaker is 0.5%, the elongation of the leveler is 2.8%, the elongation of the plated finisher is 3.5%, and the elongation of the tension leveler is 0.3%; in the heating process, the time of the steel plate in the furnace is about 40s, the dew point of the induction heating furnace is less than-35 ℃, the furnace pressure is 1.0mbar, the hydrogen-nitrogen proportion is 11 percent, the outlet of the heating section is 550 ℃, the outlet plate temperature of the soaking section is 530 ℃, and the outlet plate temperature of the rapid cooling section is 470 ℃; in the galvanizing process, the temperature of zinc liquid in a zinc pot is controlled at 460 ℃; in the cooling process after plating, the temperature of the strip steel of the first group of fans is 390 ℃, the temperature of the top of the cooling tower is 180 ℃, the water quenching cooling adopts immersion cooling, and the temperature of a water quenching outlet is 40 ℃; the surface treatment process comprises chromic acid passivation and oiling. Tests prove that the steel plate prepared by the method has the thickness of 2.5mm, the yield strength of 530MPa and the coating weight of 275g/m2。
Example 3
A manufacturing method of a steel plate for a high-corrosion-resistance photovoltaic bracket comprises the steps of carrying out acid pickling, leveling, heating, galvanizing, cooling after plating and surface treatment on a galvanized substrate through an acid plating continuous process to obtain a plated plate, namely the steel plate for the high-corrosion-resistance photovoltaic bracketAnd (3) a plate. The galvanized substrate comprises the following chemical components in percentage by weight: 0.065%, si:0.15%, mn:1.1%, P:0.015%, S:0.002%, als:0.03%, ti:0.025%, nb:0.02%, the balance being Fe and unavoidable impurities; the chemical components of the zinc liquid used for galvanizing are Al:6%, mg:2.6%, fe:0.02%, and the balance of zinc and inevitable impurities. Wherein in the acid washing process, the free acidity of the acid tank is 85g/L, the total acidity is 225g/L, the acid washing temperature is 90 ℃, the rinsing water temperature is 50 ℃, and the conductivity is 40ms/cm; in the flattening process, a large reduction flattening process is adopted before and after plating, and the specific process parameters are set as follows: the elongation of the scale breaker is 0.5 percent, the elongation of the leveler is 2.5 percent, the elongation of the plated finisher is 3 percent, and the elongation of the withdrawal and straightening machine is 0.3 percent; in the heating process, the time of the steel plate in the furnace is about 30s, the dew point of the induction heating furnace is less than-35 ℃, the furnace pressure is 0.7mbar, the hydrogen-nitrogen proportion is 8 percent, the outlet temperature of the heating section is 525 ℃, the outlet plate temperature of the soaking section is 520 ℃, and the outlet plate temperature of the rapid cooling section is 460 ℃; in the galvanizing process, the temperature of the zinc liquid in a zinc pot is controlled at 455 ℃; in the cooling process after plating, the strip steel temperature of the first group of fans is 380 ℃, the tower top temperature of the cooling tower is 170 ℃, the water quenching cooling adopts immersion type cooling, and the water quenching outlet temperature is 35 ℃: the surface treatment process comprises chromic acid passivation and oiling. Tests prove that the steel plate prepared by the method has the thickness of 3mm, the yield strength of 600MPa and the coating weight of 275g/m2。
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The manufacturing method of the steel plate for the high-corrosion-resistance photovoltaic bracket is characterized in that an acid plating continuous process is adopted, and the chemical components of a galvanized substrate are as follows in percentage by weight: 0.050 to 0.080%, si:0.10 to 0.20%, mn:0.9 to 1.25%, P: less than or equal to 0.019%, S: less than or equal to 0.003 percent, als:0.020 to 0.040%, ti:0.010 to 0.040%, nb:0.015 to 0.030 percent, and the balance of Fe and inevitable impurities; the chemical components of the zinc liquid used for galvanizing are Al: 5-6.5%, mg: 2.5-2.8%, fe: less than or equal to 0.03 percent, and the balance of zinc and inevitable impurities.
2. The manufacturing method of the steel plate for the high-corrosion-resistance photovoltaic bracket as claimed in claim 1, wherein the manufacturing method comprises the steps of carrying out acid pickling, flattening, heating, galvanizing, cooling after plating and surface treatment on the galvanized substrate through an acid plating continuous process to obtain a plated plate, namely the steel plate for the high-corrosion-resistance photovoltaic bracket.
3. The method for manufacturing the steel plate for the highly corrosion-resistant photovoltaic bracket according to claim 2, wherein in the pickling process, the free acidity of the acid tank is 80-90 g/L, the total acidity is 220-230 g/L, the pickling temperature is 85-95 ℃, the rinsing water temperature is 45-55 ℃, and the conductivity is 30-50 (ms/cm).
4. The manufacturing method of the steel plate for the highly corrosion-resistant photovoltaic bracket according to claim 2, wherein in the flattening process, a high reduction flattening process is adopted before and after plating.
5. The manufacturing method of the steel plate for the highly corrosion-resistant photovoltaic bracket according to claim 4, wherein the process parameters of the high reduction flattening process are as follows: the elongation percentage of the scale breaker is 0.5 percent, the elongation percentage of the leveler is 2.0-2.8 percent, the elongation percentage of the coated finisher is 2.5-3.5 percent, and the elongation percentage of the tension leveler is 0.3 percent.
6. The manufacturing method of the steel plate for the highly corrosion-resistant photovoltaic bracket according to claim 2, wherein in the heating process, the furnace time of the steel plate is 20-40 s, the dew point of the induction heating furnace is less than-35 ℃, the furnace pressure is 0.4-1.0 mbar, the hydrogen-nitrogen ratio is 6-11%, the outlet of the heating section is 510-550 ℃, the outlet plate temperature of the soaking section is 510-530 ℃, and the outlet plate temperature of the rapid cooling section is 450-470 ℃.
7. The method for manufacturing the steel plate for the highly corrosion-resistant photovoltaic bracket as recited in claim 2, wherein the temperature of the molten zinc is controlled to be 450-460 ℃ in the galvanizing process.
8. The manufacturing method of the steel plate for the highly corrosion-resistant photovoltaic bracket as claimed in claim 2, wherein in the cooling process after plating, the temperature of the first group of fan strip steel is 370-390 ℃, the temperature of the tower top of the cooling tower is less than or equal to 200 ℃, the water quenching cooling adopts immersion cooling, and the temperature of the water quenching outlet is less than or equal to 45 ℃.
9. The method for manufacturing a steel plate for a highly corrosion-resistant photovoltaic bracket according to claim 2, wherein the surface treatment process comprises one or more of chromic acid passivation or oiling.
10. The method for manufacturing the steel plate for the highly corrosion-resistant photovoltaic bracket as claimed in claim 2, wherein the steel plate for the highly corrosion-resistant photovoltaic bracket has a thickness of 1.5 to 3.0mm and a coating weight of 275g/m2And the yield strength is 400-600 MPa.
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| CN202210644737.1A CN115261703A (en) | 2022-06-08 | 2022-06-08 | Manufacturing method of high-corrosion-resistance steel plate for photovoltaic support |
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Application publication date: 20221101 |