CN116970891A - Alloyed hot dip galvanized steel and preparation method thereof - Google Patents
Alloyed hot dip galvanized steel and preparation method thereof Download PDFInfo
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- CN116970891A CN116970891A CN202310742250.1A CN202310742250A CN116970891A CN 116970891 A CN116970891 A CN 116970891A CN 202310742250 A CN202310742250 A CN 202310742250A CN 116970891 A CN116970891 A CN 116970891A
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 24
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 239000011248 coating agent Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 238000007747 plating Methods 0.000 claims abstract description 16
- 238000005275 alloying Methods 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 17
- 230000003746 surface roughness Effects 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000013067 intermediate product Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 5
- 238000005260 corrosion Methods 0.000 abstract description 26
- 230000007797 corrosion Effects 0.000 abstract description 26
- 239000003973 paint Substances 0.000 abstract description 14
- 238000004090 dissolution Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 239000007921 spray Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000001962 electrophoresis Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/001—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as supporting member
-
- 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
- C23C2/26—After-treatment
-
- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/285—Thermal after-treatment, e.g. treatment in oil bath for remelting the coating
-
- 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
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
- C25D13/16—Wires; Strips; Foils
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Coating With Molten Metal (AREA)
Abstract
The application relates to alloyed hot-dip galvanized steel and a preparation method thereof, belonging to the technical field of steel preparation; the steel comprises a substrate and a plating layer, wherein the surface of the plating layer comprises a rough part and a flat part, the phase structure of the rough part comprises delta phase, and the flat part accounts for not less than 90 percent; the phase structure of the rough part of the coating comprises delta phase and a flat part containing not less than 90%, the delta phase can improve paint film adhesion and initial dissolution potential of the coating, the flat part on the surface slows down crack propagation speed, the roughness of the coating provides larger specific surface area to help phosphating reaction and improve paint film adhesion, and the whole corrosion resistance of the alloyed hot-dip galvanized steel is improved under the condition of not coating additional coating.
Description
Technical Field
The application relates to the technical field of steel preparation, in particular to alloyed hot dip galvanized steel and a preparation method thereof.
Background
Galvannealed (GA) materials are widely used in the automotive industry due to their better weldability, paintability and in some cases corrosion resistance. The GA steel plate is obtained by hot-dip pure zinc steel plate through Fe-Zn diffusion at a certain temperature, so that different Fe-Zn intermetallic compounds are formed when alloying processes of the coating are different, and mainly comprises zeta phase (FeZn 13 ) Delta phase (FeZn) 7 ) F 1 phase (FeZn) 4 Or FeZn 21 ) F phase (Fe) 3 Zn 10 ) Etc. The mechanical and electrochemical properties of each phase are different, so that the alloying process can influence the electrochemical properties of the coating of the alloyed hot-dip galvanized sheet.
If the alloying process is controlled improperly, the mechanical and electrochemical properties of the coating of the alloyed hot-dip galvanized plate are changed, so that cracks are easy to generate on the surface of the coating in a corrosion environment to accelerate the diffusion of corrosion medium, and the phosphating activity of the coating in phosphating solution is affected, so that the corrosion resistance of the alloyed hot-dip galvanized plate is finally reduced after the coating is painted, and the subsequent use is affected.
Disclosure of Invention
The application provides alloyed hot dip galvanized steel and a preparation method thereof, which are used for improving the corrosion resistance of the alloyed hot dip galvanized steel.
In a first aspect, the present application provides an alloyed hot-dip galvanized steel comprising a base and a plating layer, the plating layer surface comprising a roughened portion whose phase structure comprises a delta phase and a flat portion whose proportion is not less than 90%.
As an alternative embodiment, the surface roughness Ra of the coating is 0.6-2.0 mu m, RPc is equal to or more than 60cm -1 。
As an alternative embodiment, the thickness of the coating is 30-80g/m 2 。
As an alternative embodiment, the iron content of the coating is 7% -11% by mass.
In a second aspect, the present application provides a method for preparing galvannealed steel, the steel being the galvannealed steel according to the first aspect, the method comprising:
carrying out hot dip plating on the strip steel to obtain strip steel with a coating;
alloying the strip steel containing the coating to obtain an intermediate product;
and finishing the intermediate product to obtain the alloyed hot dip galvanized steel.
As an alternative embodiment, the temperature of the coated strip steel is 450-500 ℃ during the alloying; and/or
The alloying temperature is 450-550 ℃; and/or
The alloying time is 5-20s.
As an alternative embodiment, the temperature of the coated strip steel is 450-470 ℃ during the alloying; and/or
The alloying temperature is 500-550 ℃; and/or
The alloying time is 9-14s.
As an alternative embodiment, the temperature of the coated strip steel is 455-465 ℃ during the alloying; and/or
The alloying temperature is 515-535 ℃; and/or
The alloying time is 11-12s.
As an alternative embodiment, the finished finishing roller has a surface roughness Ra of 1.0-4.0 μm; and/or
The elongation of the finishing is 0.3% -2.2%.
As an alternative embodiment, the finished finishing roller has a surface roughness Ra of 1.2-2.2 μm; and/or
The elongation of the finishing is 0.6% -1.8%.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the alloyed hot-dip galvanized steel provided by the embodiment of the application, as the phase structure of the rough part of the coating comprises the delta phase and the flat part which contains not less than 90%, the delta phase can improve the adhesive force of a paint film and the initial dissolution potential of the coating, the crack propagation speed of the flat part on the surface is slowed down, and the roughness of the coating provides a larger specific surface area, so that the phosphating reaction and the adhesive force of the paint film are facilitated, and the overall corrosion resistance of the alloyed hot-dip galvanized steel is improved under the condition that no additional coating is coated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method provided by an embodiment of the present application;
FIG. 2 is a graph showing the results of the neutral salt spray cross-over corrosion of the electrophoretic paint film on the alloyed hot-dip galvanized steel provided in example 1 of the present application;
FIG. 3 is a graph showing the results of the neutral salt spray cross-over corrosion of the electrophoretic paint film on the alloyed hot-dip galvanized steel provided in example 2 of the application;
FIG. 4 is a graph showing the results of the neutral salt spray cross-over corrosion of the electrophoretic paint film on the alloyed hot-dip galvanized steel provided in example 3 of the application;
FIG. 5 is a graph showing the results of the neutral salt spray cross-over corrosion of the electrophoretic paint film on the alloyed hot-dip galvanized steel provided by comparative example 1 of the application;
FIG. 6 is a graph showing the results of the neutral salt spray cross-over corrosion of the electrophoretic paint film on the alloyed hot-dip galvanized steel provided by comparative example 2 of the application;
FIG. 7 is a graph showing the results of the neutral salt spray cross-over corrosion of the electrophoretic paint film on the alloyed hot-dip galvanized steel provided in comparative example 3 of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
The embodiment of the application provides alloyed hot-dip galvanized steel, which comprises a substrate and a plating layer, wherein the surface of the plating layer comprises a rough part and a flat part, the phase structure of the rough part comprises delta phase, and the flat part accounts for not less than 90%.
The main functions of the parameters are as follows:
delta phase: the delta phase is mainly of a particle structure, the higher the surface delta phase is, the larger the specific surface area provided by the delta phase is, so that the adhesive force of an electrophoretic paint film can be effectively improved, the diffusion of corrosion products is inhibited, and the corrosion speed of materials is slowed down; meanwhile, the inventor researches in the application process to find that the higher the delta phase is in the coating, the higher the initial dissolution potential of the coating is, and the better the corrosion resistance of the coating is.
Plating flat portion: the flat part of the surface layer of the coating is not easy to generate cracks penetrating the coating in the corrosion process, so that the galvanic corrosion effect among different phases can be reduced, and the corrosion expansion speed is reduced.
In some embodiments, the surface roughness Ra of the coating is 0.6-2.0 μm, RPc is equal to or greater than 60cm -1 . The thickness of the plating layer is 30-80g/m 2 . The mass content of iron in the coating is 7% -11%.
Roughness: the Ra and RPc values are improved, the specific surface area of the surface of the coating can be increased, and the reaction area of the coating in the phosphating solution is increased, so that the phosphating reaction is easier to carry out; meanwhile, the increased specific surface area can also improve the adhesive force of the plating layer and reduce the corrosion expansion speed.
As shown in fig. 1, an embodiment of the present application provides a method for preparing a galvannealed steel, where the steel is a galvannealed steel according to the first aspect, and the method includes:
s1, carrying out hot dip plating on strip steel to obtain strip steel with a coating;
s2, alloying the strip steel containing the coating to obtain an intermediate product;
in some embodiments, the temperature of the coated strip steel during the alloying is 450-500 ℃; the alloying temperature is 450-550 ℃; the alloying time is 5-20s.
If the alloying temperature is too low and the time is too short, the coating is underalloyed, and if the alloying temperature is too high and the time is too long, the chalking resistance of the coating is reduced.
Preferably, the temperature of the strip steel containing the coating is 450-470 ℃ during alloying; the alloying temperature is 500-550 ℃; the alloying time is 9-14s. Further, during alloying, the temperature of the strip steel containing the coating is 455-465 ℃; the alloying temperature is 515-535 ℃; the alloying time is 11-12s.
S2, finishing the intermediate product to obtain the alloyed hot dip galvanized steel.
In some embodiments, the finished smooth roll has a surface roughness Ra of 1.0-4.0 μm; the elongation of the finishing is 0.3% -2.2%.
Too high surface roughness of the finishing roller and too high finishing elongation can cause too high surface roughness, so that too high roughness of a paint film after electrophoresis can also influence stamping performance; too low surface roughness and too low elongation of the finishing roller can lead to the fact that the surface of the plating layer cannot be leveled, and the surface roughness and the surface leveling part are affected.
Preferably, the surface roughness Ra of the polished finishing roller is 1.2-2.2 mu m; the elongation of the finishing is 0.6% -1.8%.
The alloyed hot-dip galvanized sheet obtained by the method is obtained byThe alloying process and the finishing process are regulated, the surface roughness Ra value of the obtained alloyed hot dip galvanized plate is 0.6-2.0 mu m, and the RPc value is more than 60cm -1 The iron content of the coating is 7-11%. The surface is divided into a flat part and a rough part, the phase structure of the rough part is delta phase, all the phases are uniformly distributed, the surface flat structure accounts for more than 90%, and the corrosion resistance of the alloyed hot dip galvanized sheet after painting can be improved.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Examples 1 to 3 and comparative examples 1 to 3
A preparation method of alloyed hot dip galvanized steel comprises the following steps:
s1, carrying out hot dip plating on strip steel to obtain strip steel with a coating;
s2, alloying the strip steel containing the coating to obtain an intermediate product;
s3, finishing the intermediate product to obtain the alloyed hot dip galvanized steel.
The main parameter control of the above steps is shown in the following table:
after simultaneously phosphating and electrophoresis treatment of examples 1-3 and comparative examples 1-3, a neutral salt spray experiment was performed after the surface of the electrophoretic paint film was scratched, PB-L3065 type phosphating solution and PL-X type surface conditioning solution of Guangzhou Paka-face finishing company were used as the phosphating solution, and the electrophoretic paint was PPG. And taking out the electrophoresis sample after 1000h of neutral salt spray experiment, and measuring the widest part of the corrosion bubbling as the corrosion expansion width. The smaller the expansion width, the better the corrosion resistance of the material. The experimental evaluation results of each example and comparative example are shown in the following table and fig. 2 to 7:
as can be seen from the table, the overall corrosion width of the examples 1-3 can be controlled below 3.5mm, which is obviously smaller than that of the comparative example, and the corrosion resistance of the alloyed hot dip galvanized steel prepared by the method provided by the embodiment of the application is better.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to".
Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. 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 application. Thus, the present application 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. An alloyed hot-dip galvanized steel, characterized in that the steel comprises a base body and a plating layer, the plating layer surface comprises a rough portion and a flat portion, the phase structure of the rough portion comprises a delta phase, and the flat portion has a proportion of not less than 90%.
2. The galvannealed steel according to claim 1, characterized in that the surface roughness Ra of the coating is 0.6-2.0 μm, RPc ≡60cm ≡ -1 。
3. The galvannealed steel according to claim 1, characterized in that the thickness of the coating is 30-80g/m 2 。
4. The galvannealed steel according to claim 1, characterized in that the mass content of iron in the coating is 7-11%.
5. A method of producing a galvannealed steel, characterized in that the steel is a galvannealed steel as claimed in any one of claims 1 to 4, the method comprising:
carrying out hot dip plating on the strip steel to obtain strip steel with a coating;
alloying the strip steel containing the coating to obtain an intermediate product;
and finishing the intermediate product to obtain the alloyed hot dip galvanized steel.
6. The method for producing an galvannealed steel according to claim 5, characterized in that the temperature of the coated strip steel during the alloying is 450-500 ℃; and/or
The alloying temperature is 450-550 ℃; and/or
The alloying time is 5-20s.
7. The method for producing an galvannealed steel according to claim 6, characterized in that the temperature of the coated strip steel during the alloying is 450-470 ℃; and/or
The alloying temperature is 500-550 ℃; and/or
The alloying time is 9-14s.
8. The method for producing an galvannealed steel according to claim 7, characterized in that the temperature of the coated strip steel during the alloying is 455-465 ℃; and/or
The alloying temperature is 515-535 ℃; and/or
The alloying time is 11-12s.
9. The method for producing an galvannealed steel according to claim 5, characterized in that the surface roughness Ra of the finished finishing roller is 1.0-4.0 μm; and/or
The elongation of the finishing is 0.3% -2.2%.
10. The method for producing an galvannealed steel according to claim 9, characterized in that the surface roughness Ra of the finished finishing roller is 1.2-2.2 μm; and/or
The elongation of the finishing is 0.6% -1.8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310742250.1A CN116970891A (en) | 2023-06-21 | 2023-06-21 | Alloyed hot dip galvanized steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310742250.1A CN116970891A (en) | 2023-06-21 | 2023-06-21 | Alloyed hot dip galvanized steel and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116970891A true CN116970891A (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310742250.1A Pending CN116970891A (en) | 2023-06-21 | 2023-06-21 | Alloyed hot dip galvanized steel and preparation method thereof |
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| CN (1) | CN116970891A (en) |
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- 2023-06-21 CN CN202310742250.1A patent/CN116970891A/en active Pending
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