CN112575276A - Hot-dip zinc-aluminum-magnesium alloy coated steel plate for ultra-deep drawing and preparation method thereof - Google Patents
Hot-dip zinc-aluminum-magnesium alloy coated steel plate for ultra-deep drawing and preparation method thereof Download PDFInfo
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- 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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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C18/00—Alloys based on zinc
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- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- 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
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- 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
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Abstract
The invention belongs to the technical field of hot-dip coated steel plates, and particularly relates to a hot-dip zinc-aluminum-magnesium alloy coated steel plate for ultra-deep drawing and a preparation method thereof. The invention provides a hot-dip galvanized aluminum magnesium alloy coated steel plate for ultra-deep drawing, which comprises a steel base and a coating, wherein the coating comprises the following main components: 0.8-2.5% of aluminum, 0.8-2.0% of magnesium, 0.02-0.20% of trace alloy elements and the balance of zinc and inevitable impurities, wherein the trace alloy contains more than or equal to 0.02% of vanadium. According to the invention, the addition of C, S, P and other impurity elements, Ti and Nb elements and Ti and Nb solid solution impurity elements are strictly controlled by the steel base, so that the condition that the steel base surface impurity elements promote the growth of brittle phase zeta phase in the coating is avoided, the formability of the coating is improved, the deep drawing performance of the steel is further improved, and the steel has good practical value.
Description
Technical Field
The invention belongs to the technical field of hot-dip coated steel plates, and particularly relates to a hot-dip zinc-aluminum-magnesium alloy coated steel plate for ultra-deep drawing and a preparation method thereof.
Background
The Zn-Al-Mg alloy coating has attracted wide attention abroad in the 80 s of the 20 th century, and becomes a research focus in the professional field of hot dip galvanizing and zinc alloy coating. From the research results of the same lines at home and abroad, the hot-dip galvanized Zn-Al-Mg alloy coated steel plate added with Mg has better corrosion resistance under the condition that the contents of Zn and Al of the coatings are at the same level, and the processing application performance (formability, weldability and paintability) of the material is excellent, so that the hot-dip galvanized Zn-Al-Mg alloy coated steel plate can replace the existing corresponding hot-dip galvanized or zinc alloy coated steel plate, and has very wide market demand prospect.
The hot dip Zn-Al-Mg alloy coated steel plate is mainly applied to the building industry at present, and is gradually popularized and applied to the industries of household appliances, automobile manufacturing and the like. The research on the Zn-Al-Mg alloy coating in China is late, and only enterprises such as Bao steel, saddle steel, wine steel and Shandongkui at present put forward the hot dip Zn-Al-Mg alloy coating steel plate.
The existing hot dip Zn-Al-Mg alloy coated steel plate can be divided into three types of low aluminum (W Al is less than 5 percent), medium aluminum (W Al is more than or equal to 5 percent and less than 13 percent) and high aluminum (W Al is more than or equal to 47 percent and less than or equal to 57 percent). For different varieties of Zn-Al-Mg alloy coating steel plates, the contents of Al and Mg in the coatings are different, and the organizational structure and the quality performance of the coatings are different, so the application fields are different. As the content of Al and Mg increases, the corrosion resistance of the plating layer increases, but the formability and weldability decrease. In the field of household appliance and automobile application, in order to ensure that a Zn-Al-Mg alloy coating steel plate meets the punch forming requirement of a user, a low-aluminum component system is required to have good formability. However, after the low-aluminum Zn-Al-Mg alloy coating steel plate is bent and formed, macroscopic microcracks still exist, and in order to meet the deep drawing requirements of users, the forming performance of the coating needs to be further improved.
Patent CN111519117A provides a high surface quality zinc-aluminum-magnesium steel plate with excellent blackening resistance and a production method thereof, the plating solution comprises the following components: 1.0-3.0% of Al, 1.0-3.0% of Mg1.0, 0.005-0.055% of Cu, 0.005-0.035% of Ti, 0.05-1.0% of Si, and the balance of Zn and inevitable impurities. The temperature of the plating solution is 410-460 ℃, and the temperature of the strip steel entering the pot is 400-480 ℃. Cooling at the speed of 10-30 ℃/s after plating, and cooling the plate to be not higher than 200 ℃; the temperature of the front plate is not higher than 80 ℃ before entering the quenching tank, and the front plate enters the quenching tank to be cooled to be not higher than 40 ℃. According to the steel plate disclosed by the patent, Si, Ti and Cu are added into a plating solution, and processes such as dip plating, cooling after plating, polishing and the like are matched, so that the product has less zinc dross, the grain size of the plating layer is refined, and the steel plate has excellent blackening resistance and corrosion resistance, and also has excellent surface quality and processing forming performance.
Patent CN110100036A discloses a hot-dip galvanized steel material and a method for producing the same, the hot-dip galvanized steel material including base iron and a hot-dip galvanized layer formed on the base iron, the hot-dip galvanized layer including, in weight%: al: 0.01-0.5%, Mg: 0.01-1.5%, Mn: 0.05-1.5%, Fe: 0.1 to 6%, and the balance of Zn and unavoidable impurities, wherein a Zn Fe Mn alloy phase is present at the interface between the base iron and the hot-dip galvanizing layer, and the area ratio of the Zn Fe Mn alloy phase to the area of the hot-dip galvanizing layer is 1 to 60%.
Patent CN110512118A discloses a high surface quality zinc-aluminum-magnesium coated steel plate for automobiles and a production process thereof, wherein the plating solution comprises the following chemical components in percentage by mass: al + Mg: 2-6%, Mg/Al: 0.8-1.2%, Cr: 0.1-0.6%, Ti: 0.2 to 1.0%, Cu: 0.5-2.5%, and the balance of Zn and inevitable impurities; the IF steel, BH steel, HSLA steel and DP steel substrates are produced by hot dip coating by adopting an American steel union process, and the TRIP steel and Q & P steel substrates are produced by hot dip coating by adopting the American steel union process and the Sendzimir method. According to the invention, Ti, Cr and Cu elements are added on the basis of Zn, Al and Mg, so that refined coating grain size can be obtained, coating hardness is improved, and coating performance is as follows: hardness is 120-150 HV, surface quality: the luminosity value is 0.69-0.89, and the coating has good scratch resistance and coating surface quality.
Patent CN108513591A discloses a method for producing a steel sheet having a microstructure consisting of, in area fraction: 20% to 50% of sub-temperature ferrite, 10% to 20% of residual austenite, 25% to 45% of tempered martensite, 10% to 20% of fresh martensite, and bainite, the sum of tempered martensite and bainite being 30% to 60%, the method comprising the sequential steps of: providing a cold rolled steel sheet, the chemical composition of the steel comprising in weight%: 0.18% ≦ C ≦ 0.25%, 0.9% ≦ Si ≦ 1.8%, 0.02% ≦ Al ≦ 1.0%, wherein 1.00% ≦ Si + Al ≦ 2.35%, 1.5% ≦ Mn ≦ 2.5%, 0.010% ≦ Nb ≦ 0.035%, 0.10% ≦ Cr ≦ 0.40%, and the remainder being Fe and unavoidable impurities, annealing the steel sheet at an annealing temperature TA and for an annealing time tA to obtain a structure comprising 50% to 80% austenite and 20% to 50% ferrite, quenching the sheet at a cooling rate of 20 ℃/sec to 50 ℃/sec to a quenching temperature QT of Ms 50 ℃ to Ms 5 ℃, heating the sheet to a partitioning temperature of 375 ℃ to 450 ℃ and holding the sheet at the partitioning temperature PT for a partitioning time Pt of at least 50 sec, cooling the sheet to room temperature.
Therefore, the existing ultra-deep drawing hot dip Zn-Al-Mg alloy coated steel plate mainly improves the coating components to improve the formability of the coating, for example, trace elements such as Ti, Cr and Cu are added to improve the formability of the coating, the steel base and the bonding effect of the steel base and the coating are less, and the use requirements of deep drawing parts can not be completely met, so that the development of the aluminum-magnesium alloy coated steel plate for ultra-deep drawing is needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing hot dip Zn-Al-Mg alloy coated steel plate mainly improves the formability of a coating by improving the components of the coating and can not completely meet the use requirements of deep drawing parts.
The technical scheme for solving the technical problems comprises the following steps: provides a hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing. The hot-dip zinc-aluminum-magnesium alloy plated steel plate consists of a steel base and a plating layer, wherein the plating layer mainly comprises the following components: 0.8 to 2.5 percent of aluminum, 0.8 to 2.0 percent of magnesium, 0.02 to 0.20 percent of trace alloy element and the balance of zinc and inevitable impurities.
In the hot-dip galvanized aluminum-magnesium alloy coating steel plate for ultra-deep drawing, the Zn content in the coating is more than or equal to 96.0%.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the trace alloy element in the plating layer is at least one of vanadium, niobium and zirconium.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the total amount of trace alloy elements in the plated layer is 0.03-0.15%.
Preferably, in the hot-dip galvanized aluminum-magnesium alloy plated steel sheet for extra-deep drawing, the trace alloy elements in the plating layer are a combination of vanadium and niobium or a combination of vanadium and zirconium, wherein the content of vanadium is not less than 0.02%.
Preferably, in the hot-dip galvanized aluminum-magnesium alloy plated steel sheet for extra-deep drawing, the content of vanadium in trace alloy elements in the plating layer is 0.03-0.10%.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the total amount of inevitable impurities in the plating layer is less than or equal to 0.010 percent, wherein lead is less than or equal to 0.003 percent, antimony is less than or equal to 0.002 percent, silicon is less than or equal to 0.003 percent, and tin is less than or equal to 0.001 percent.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the plating layer is a double-sided plating layer, and the total weight of the plating layer is 20-400 g/m2。
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the steel base is ultra-low carbon steel consisting of ferrite.
In the hot-dip zinc-aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the steel base mainly comprises the following components: the alloy comprises, by weight, less than or equal to 0.003% of carbon, less than or equal to 0.02% of silicon, 0.05-0.20% of manganese, less than or equal to 0.01% of phosphorus, less than or equal to 0.01% of sulfur, 0.02-0.10% of aluminum, 0.05-0.10% of titanium, 0.01-0.03% of niobium, and the balance of iron and inevitable impurities.
Wherein the yield strength of the hot-dip zinc-aluminum magnesium alloy plated steel plate for the ultra-deep drawing is not more than 180MPa, the tensile strength is 260-350 MPa, and the elongation A is80mm≥40％，n≥0.20，r≥2.2。
The invention also provides a hot dip coating method of the hot dip zinc-aluminum-magnesium alloy coated steel plate for deep drawing, which comprises the steps of steel base degreasing cleaning, continuous annealing, hot dip coating, air knife purging and cooling; wherein the volume fraction of hydrogen in the furnace is controlled to be more than or equal to 3.5 percent by the continuous annealing process; the temperature difference between the temperature of the steel plate entering the zinc pot and the temperature of the plating solution is controlled to be +/-20 ℃; the cooling adopts a quick cooling (non-natural cooling) mode, and the temperature of the strip steel reaching the top steering roller is less than or equal to 320 ℃.
Further, in the hot dip coating method of the hot dip zinc-aluminum-magnesium alloy coated steel plate for deep drawing, the temperature of the steel plate entering a zinc pot is controlled to be 380-530 ℃ in the hot dip coating process, and the temperature of the coating is controlled to be 390-550 ℃.
The invention has the beneficial effects that:
according to the invention, the addition of impurity elements such as C, S, P and the like and Ti and Nb elements are strictly controlled by the steel base, and Ti and Nb are solid-dissolved impurity elements, so that the condition that the impurity elements on the surface of the steel base promote the growth of a brittle phase zeta phase in a coating is avoided, and the formability of the coating is improved; the addition of trace elements in the coating enhances the infiltration effect of the steel base and the plating solution, inhibits the growth of a zeta phase layer, provides heterogeneous nucleation points in the formation process of the coating, refines and reduces the grain size of the coating, improves the ductility of the coating, reduces the crack width and density of the zinc-aluminum-magnesium alloy coating steel plate in the ultra-deep drawing forming process, improves the formability and corrosion resistance of the coating, and meets the use requirements of ultra-deep drawing of users.
Detailed Description
The invention provides a hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, which consists of a steel base and a plating layer, wherein the plating layer mainly comprises the following components: 0.8 to 2.5 percent of aluminum, 0.8 to 2.0 percent of magnesium, 0.02 to 0.20 percent of trace alloy element and the balance of zinc and inevitable impurities.
In the hot-dip galvanized aluminum-magnesium alloy coating steel plate for ultra-deep drawing, the Zn content in the coating is more than or equal to 96.0%. The formability of the plating layer becomes poor with the increase of the contents of Al and Mg; in order to ensure good formability of the coating and ensure good coating after ultra-deep drawing, the invention particularly requires that the Zn content is more than or equal to 96.0 percent.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the trace alloy element in the plating layer is at least one of vanadium, niobium and zirconium.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the total amount of trace alloy elements in the plated layer is 0.03-0.15%.
Preferably, in the hot-dip galvanized aluminum-magnesium alloy plated steel sheet for extra-deep drawing, the trace alloy elements in the plating layer are a combination of vanadium and niobium or a combination of vanadium and zirconium, wherein the content of vanadium is not less than 0.02%.
The purpose of adding vanadium in the invention is as follows: the vanadium and the Fe have good affinity, can enhance the binding action of the plating layer and the steel base, and carry out heterogeneous nucleation in the crystallization process of the plating layer to refine the tissue structure of the plating layer, thereby improving the formability of the plating layer. However, if the vanadium content is too much, the coating is easily pulverized, and the formability of the coating is reduced, so that the vanadium content of the coating is required to be 0.03-0.10%.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the total amount of inevitable impurities in the plating layer is less than or equal to 0.010 percent, wherein lead is less than or equal to 0.003 percent, antimony is less than or equal to 0.002 percent, silicon is less than or equal to 0.003 percent, and tin is less than or equal to 0.001 percent.
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the plating layer is a double-sided plating layer, and the total weight of the plating layer is 20-400 g/m2。
In the hot-dip galvanized aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the steel base is ultra-low carbon steel consisting of ferrite.
In the hot-dip zinc-aluminum-magnesium alloy plated steel plate for ultra-deep drawing, the steel base mainly comprises the following components: the alloy comprises, by weight, less than or equal to 0.003% of carbon, less than or equal to 0.02% of silicon, 0.05-0.20% of manganese, less than or equal to 0.01% of phosphorus, less than or equal to 0.01% of sulfur, 0.02-0.10% of aluminum, 0.05-0.10% of titanium, 0.01-0.03% of niobium, and the balance of iron and inevitable impurities.
According to the invention, the impurity elements such as C, S, P and the like are strictly controlled in the steel base component, and the synergistic effect of the addition of Ti and Nb elements and the addition of trace elements in the coating is added, so that the chemical reaction process of the zinc-aluminum-magnesium plating solution on the surface of the steel base is changed, the formation of the coating structure is influenced, the brittle phase zeta phase is reduced, and the crystal grains are refined, thereby integrally improving the formability and corrosion resistance of the coating and meeting the use requirement of ultra-deep drawing of a user.
Wherein the yield strength of the hot-dip zinc-aluminum magnesium alloy plated steel plate for the ultra-deep drawing is not more than 180MPa, the tensile strength is 260-350 MPa, and the elongation A is80mm≥40％，n≥0.20，r≥2.2。
The invention also provides a hot dip coating method of the hot dip zinc-aluminum-magnesium alloy coated steel plate for deep drawing, which comprises the steps of steel base degreasing cleaning, continuous annealing, hot dip coating, air knife purging and cooling; wherein the volume fraction of hydrogen in the furnace is controlled to be more than or equal to 3.5 percent by the continuous annealing process; the temperature difference between the temperature of the steel plate entering the zinc pot and the temperature of the plating solution is controlled to be +/-20 ℃; the cooling adopts a quick cooling (non-natural cooling) mode, and the temperature of the strip steel reaching the top steering roller is less than or equal to 320 ℃.
The hot deep drawing performance of the steel plate is improved by the common combination of the following parameters, degreasing and cleaning are performed to ensure that grease on the surface of the steel base is cleaned, hydrogen in annealing is performed to ensure a reducing atmosphere, oxidation is avoided, the surface activity of the steel base is enhanced, and the reaction combination of a plating layer and the steel base is promoted; the temperature difference between the temperature of the steel plate entering a zinc pot and the temperature of the plating solution is controlled so as to ensure the stability of the temperature of the plating solution and the stability of hot dipping; the rapid cooling is adopted to accelerate crystallization and inhibit the growth of crystal nucleus, and through the synergistic effect of the process, the plating layer, the steel base and the plating layer are tightly combined together, and the crystal grains of the plating layer are reduced.
Further, in the hot dip coating method of the hot dip zinc-aluminum-magnesium alloy coated steel plate for deep drawing, the temperature of the steel plate entering a zinc pot is controlled to be 380-530 ℃ in the hot dip coating process, and the temperature of the coating is controlled to be 390-550 ℃.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1
Preparing the hot dip galvanized aluminum-magnesium alloy coated steel plate for ultra-deep drawing, wherein the coating weight is 100g/m2(double-sided), the main components of the plating layer are: 1.0% of aluminum, 1.0% of magnesium, 0.05% of vanadium, 0.001% of lead, 0.001% of antimony, 0.002% of silicon, 0.001% of tin and the balance of zinc; the steel-based structure is ferrite, and the chemical components are as follows: 0.002% of carbon, 0.02% of silicon, 0.10% of manganese, 0.01% of phosphorus, 0.01% of sulfur, 0.04% of aluminum, 0.06% of titanium, 0.015% of Nb, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: the method comprises the following steps of degreasing cleaning, continuous annealing, hot dipping, air knife blowing and cooling, wherein the degreasing cleaning is to clean after degreasing treatment, the hydrogen in a furnace is controlled by 4.0% in the continuous annealing process according to the volume percentage, the temperature of a steel plate in a zinc pot is 400 ℃, the temperature of a plating solution in the hot dipping process is 410 ℃, the plating solution needs to be cooled quickly, and the temperature of strip steel reaching a top steering roller is 320 ℃.
The test method comprises the following steps:
corrosion resistance: a neutral salt spray accelerated corrosion test is adopted, the test conditions and the method are executed according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, a test instrument is a salt spray corrosion test box, NaCl deionized water solution with the concentration of 50g/L, pH and the value of 6.5 is used as a corrosion medium, and the test temperature is 35 +/-2 ℃; the specification of the sample is 75mm x 150mm x 0.8mm, and the edge sealing with the size of 5mm is carried out by using a transparent adhesive tape so as to prevent the end part from being rusted to influence the result; the sample is placed at an angle of 15-25 degrees with the vertical direction. The time for the surface of the specimen to develop red rust was observed.
Formability: and (3) bending the sample by 0T (bending at 180 degrees, wherein the radius of a bending core is 0), observing whether cracks appear or not by naked eyes, testing the time of red rust appearing on the bent part under the condition of a neutral salt spray test, and executing the neutral salt spray test condition and the method according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test.
Coating property: and (3) carrying out spraying and drying on the coated steel plate after degreasing, cleaning, vitrification or phosphorization, and then testing the bonding degree of the spraying coating and the steel plate by adopting a grid marking method, wherein if the coating does not fall off, the coating has good adhesiveness.
Through detection, the hot-dip galvanized aluminum magnesium alloy plated steel plate for ultra-deep drawing of the embodiment has good surface quality, and has excellent corrosion resistance, formability and coating property.
The time of red rust appearing under the neutral salt spray test condition is over 1200h, no obvious crack is seen after 0T bending, the time of red rust appearing on the bent part under the neutral salt spray test condition is over 1000h, and the sprayed coating has excellent adhesiveness after spraying and meets the requirements of users.
Example 2
Preparing the hot dip galvanized aluminum-magnesium alloy coated steel plate for the ultra-deep drawing, wherein the coating weight is 150g/m2(double-sided), the main components of the plating layer are: 2.0 percent of aluminum, 1.5 percent of magnesium, 0.08 percent of vanadium, 0.05 percent of niobium, 0.002 percent of lead, 0.001 percent of stibium, 0.003 percent of silicon, 0.002 percent of tin and the balance of zinc; the steel-based structure is ferrite, and the chemical components are as follows: 0.003% of carbon, 0.01% of silicon, 0.15% of manganese, 0.01% of phosphorus, 0.005% of sulfur, 0.05% of aluminum, 0.08% of titanium, 0.010% of Nb, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: the method comprises the following steps of degreasing cleaning, continuous annealing, hot dipping, air knife purging and cooling, wherein the degreasing cleaning is to rinse clean after degreasing treatment, the hydrogen in a furnace is controlled by 3.5% in the continuous annealing process according to the volume percentage, the temperature of a steel plate in a zinc pot is 460 ℃, the temperature of a plating solution in the hot dipping process is 450 ℃, the plating solution needs to be cooled quickly, and the temperature of the strip steel reaching a top steering roller is 280 ℃.
The test method was the same as in example 1.
Through detection, the hot-dip galvanized aluminum magnesium alloy plated steel plate for ultra-deep drawing of the embodiment has good surface quality, and has excellent corrosion resistance, formability and coating property.
The time of red rust occurrence under the neutral salt spray test condition is over 1800h, no obvious crack is seen after 0T bending, the time of red rust occurrence of a bending part under the neutral salt spray test condition is over 1700h, and the adhesion of the sprayed coating after spraying is excellent, thereby meeting the user requirements.
Example 3
Preparing the hot-dip galvanized aluminum-magnesium alloy coated steel plate for ultra-deep drawing, wherein the coating weight is 240g/m2(double-sided), the main components of the plating layer are: 1.8 percent of aluminum, 2.0 percent of magnesium, 0.12 percent of vanadium, 0.06 percent of zirconium, 0.002 percent of lead, 0.001 percent of stibium, 0.003 percent of silicon, 0.002 percent of tin and the balance of zinc; the steel-based structure is ferrite, and the chemical components are as follows: 0.0015% of carbon, 0.01% of silicon, 0.16% of manganese, 0.01% of phosphorus, 0.01% of sulfur, 0.03% of aluminum, 0.09% of titanium, 0.008% of Nb, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: the method comprises the following steps of degreasing cleaning, continuous annealing, hot dipping, air knife purging and cooling, wherein the degreasing cleaning is to rinse clean after degreasing treatment, hydrogen in a furnace is controlled by 5.5% in the continuous annealing process according to volume percentage, the temperature of a steel plate in a zinc pot is 520 ℃, the temperature of a plating solution in the hot dipping process is 540 ℃, the plating solution needs to be cooled quickly, and the temperature of strip steel reaching a top steering roller is 300 ℃.
The test method was the same as in example 1.
Through detection, the hot-dip galvanized aluminum magnesium alloy plated steel plate for ultra-deep drawing of the embodiment has good surface quality, and has excellent corrosion resistance, formability and coating property.
The time of red rust appearing under the neutral salt spray test condition is more than 3000h, no obvious crack is seen after 0T bending, the time of red rust appearing on the bending part under the neutral salt spray test condition is more than 2900h, the adhesiveness of the sprayed coating after spraying is excellent, and the requirement of a user is met.
Comparative example 1
Preparing the hot-dip galvanized aluminum-magnesium alloy coated steel plate for the ultra-deep drawing, wherein the coating weight is 120g/m2(double-sided), the main components of the plating layer are: 1.2 percent of aluminum, 1.0 percent of magnesium, 0.005 percent of vanadium, 0.001 percent of lead, 0.001 percent of stibium, 0.002 percent of silicon, 0.001 percent of tin and the balance of zinc; the steel-based structure is ferrite, and the chemical components are as follows: 0.002% of carbon, 0.02% of silicon, 0.10% of manganese, 0.01% of phosphorus, 0.01% of sulfur, 0.04% of aluminum, 0.06% of titanium, 0.015% of Nb, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: the method comprises the following steps of degreasing cleaning, continuous annealing, hot dipping, air knife purging and cooling, wherein the degreasing cleaning is to rinse clean after degreasing treatment, 4.0% of hydrogen in a furnace is controlled by volume percentage in the continuous annealing process, the temperature of a steel plate in a zinc pot is 410 ℃, the temperature of a plating solution in the hot dipping process is 410 ℃, the plating solution needs to be cooled quickly, and the temperature of strip steel reaching a top steering roller is 320 ℃.
The test method was the same as in example 1.
Through detection, the hot-dip galvanized aluminum magnesium alloy plated steel plate for ultra-deep drawing of the embodiment has good surface quality, and has excellent corrosion resistance, formability and coating property.
The time for red rust to appear under the neutral salt spray test condition is more than 1100h, slight cracks can be seen after 0T bending, the time for red rust to appear on the bending part under the neutral salt spray test condition is more than 900h, and the adhesiveness of the sprayed coating after spraying is excellent.
Comparative example 2
Preparing a hot-dip galvanized aluminum-magnesium alloy coated steel plate for ultra-deep drawing, wherein the coating weight is 160g/m2(double-sided), the main components of the plating layer are: 2.0 percent of aluminum, 1.8 percent of magnesium, 0.08 percent of vanadium, 0.05 percent of niobium, 0.002 percent of lead, 0.001 percent of stibium, 0.003 percent of silicon, 0.002 percent of tin and the balance of zinc; the steel-based structure is ferrite, and the chemical components are as follows: 0.003% of carbon, 0.01% of silicon, 0.15% of manganese, 0.01% of phosphorus, 0.005% of sulfur, 0.05% of aluminum, 0.03% of titanium, 0.010% of Nb, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps: the method comprises the following steps of degreasing cleaning, continuous annealing, hot dipping, air knife purging and cooling, wherein the degreasing cleaning is to rinse clean after degreasing treatment, the hydrogen in a furnace is controlled by 3.5% in the continuous annealing process according to the volume percentage, the temperature of a steel plate in a zinc pot is 460 ℃, the temperature of a plating solution in the hot dipping process is 450 ℃, the plating solution needs to be cooled quickly, and the temperature of the strip steel reaching a top steering roller is 280 ℃.
The test method was the same as in example 1.
Through detection, the hot-dip galvanized aluminum magnesium alloy plated steel plate for ultra-deep drawing of the embodiment has good surface quality, the time of red rust appearing under the neutral salt spray test condition is more than 1500h, no obvious crack is seen by naked eyes after 0T bending, the time of red rust appearing on a bent part under the neutral salt spray test condition is more than 1200h, and the adhesiveness of a sprayed coating after spraying is excellent; when the steel base is used by a user, the steel base is easy to crack, and the requirement of the user on ultra-deep drawing cannot be met.
Claims (10)
1. The hot-dip galvanized aluminum-magnesium alloy coating steel plate for the ultra-deep drawing is characterized in that: the steel base and the coating are composed of the following main components: 0.8 to 2.5 percent of aluminum, 0.8 to 2.0 percent of magnesium, 0.02 to 0.20 percent of trace alloy element and the balance of zinc and inevitable impurities.
2. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the Zn content in the coating is more than or equal to 96.0 percent.
3. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the total amount of the trace alloy elements in the coating is 0.03-0.15%.
4. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the trace alloy elements in the coating are the combination of vanadium and niobium or the combination of vanadium and zirconium, wherein the content of vanadium is more than or equal to 0.02 percent.
5. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the content of vanadium in the trace alloy elements in the coating is 0.03-0.10%.
6. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the total amount of inevitable impurities in the plating layer is less than or equal to 0.010 percent, wherein lead is less than or equal to 0.003 percent, antimony is less than or equal to 0.002 percent, silicon is less than or equal to 0.003 percent, and tin is less than or equal to 0.001 percent.
7. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the coating is a double-sided coating, and the total weight of the coating is 20-400 g/m2。
8. The hot-dip zinc aluminum magnesium alloy coated steel sheet for extra-deep drawing as set forth in claim 1, wherein: the main components of the steel base comprise: the alloy comprises, by weight, less than or equal to 0.003% of carbon, less than or equal to 0.02% of silicon, 0.05-0.20% of manganese, less than or equal to 0.01% of phosphorus, less than or equal to 0.01% of sulfur, 0.02-0.10% of aluminum, 0.05-0.10% of titanium, 0.01-0.03% of niobium, and the balance of iron and inevitable impurities.
9. The hot dip coating method of a hot dip zinc aluminum magnesium alloy coated steel sheet for deep drawing as set forth in any one of claims 1 to 8, wherein: the method comprises the steps of steel base degreasing cleaning, continuous annealing, hot dipping, air knife purging and cooling; wherein the volume fraction of hydrogen in the furnace is controlled to be more than or equal to 3.5 percent by the continuous annealing process; the temperature difference between the temperature of the steel plate entering the zinc pot and the temperature of the plating solution is controlled to be +/-20 ℃; the cooling adopts quick cooling, and the temperature of the strip steel reaching the top steering roller is less than or equal to 320 ℃.
10. The hot dip coating method of a hot dip zinc aluminum magnesium alloy coated steel sheet for deep drawing according to claim 9, wherein: in the hot dipping process, the temperature of the steel plate entering a zinc pot is controlled to be 380-530 ℃, and the temperature of the plating solution is controlled to be 390-550 ℃.
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| JP2021166562A JP7315634B2 (en) | 2020-12-03 | 2021-10-11 | Hot-dip Zn-Al-Mg alloy plated steel sheet for ultra-deep drawing and its manufacturing method |
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| WO2023098126A1 (en) * | 2021-11-30 | 2023-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Zinc-aluminum-magnesium alloy coating steel containing v, ce, la and mn, and preparation method therefor |
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