CN112877607B - High-strength low-alloy hot-dip aluminum alloy steel strip and manufacturing method thereof - Google Patents
High-strength low-alloy hot-dip aluminum alloy steel strip and manufacturing method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 57
- 239000000956 alloy Substances 0.000 title claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 239000011572 manganese Substances 0.000 claims abstract description 9
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 claims abstract description 3
- 238000007747 plating Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 238000003618 dip coating Methods 0.000 claims description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001567 cementite Inorganic materials 0.000 claims description 2
- 238000005097 cold rolling Methods 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 43
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- GDJWXDKMRWCHJH-UHFFFAOYSA-N [Si+4].[O-2].[Mn+2].[O-2].[O-2] Chemical compound [Si+4].[O-2].[Mn+2].[O-2].[O-2] GDJWXDKMRWCHJH-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A high-strength low-alloy hot-dip aluminum alloy steel strip and a manufacturing method thereof are disclosed, wherein the steel strip comprises an aluminum layer, an alloy layer and a substrate from top to bottom in sequence; the aluminum layer has a free aluminum phase of 50% or more, Fe content of 3% or less, and manganese oxide, silicon oxide or silicomanganese oxide content of less than 1g/m at the interface between the alloy layer and the substrate2(ii) a The Fe content in the alloy layer is 20-70%, and the weight of the alloy layer is 10-30g/m2The standard deviation satisfies 0 relative to the average value of the alloy layer weight<The standard deviation/alloy layer weight average value is less than or equal to 0.1; the substrate comprises the following components in percentage by weight: c: 0.01 to 0.15%, Si: 0.001-0.05%, Mn: 0.05-1.0%, P: 0-0.05%, S: 0-0.02%, Ti + Nb + V + B less than or equal to 0.22%, and the balance of Fe and inevitable impurities. The yield strength of the steel strip is 300-600 MPa, the tensile strength is 350-800 MPa, and the elongation is more than or equal to 15%.
Description
Technical Field
The invention relates to high-strength low-alloy steel, in particular to a high-strength low-alloy hot-dip aluminum alloy steel strip and a manufacturing method thereof.
Background
The high-strength low-alloy steel has lower cost and good toughness, is widely applied to the field of automobiles, and generally, trace strengthening elements such as Nb, Ti, V and the like are added into the steel, so that dislocation movement is hindered mainly by precipitation strengthening, and the strength is improved.
The aluminum and aluminum alloy plating layer mainly comprises a pure aluminum plating layer and an aluminum-silicon alloy plating layer, and the two plating layers have excellent corrosion resistance, high-temperature oxidation resistance, wear resistance and light and heat reflectivity, and are widely applied to the fields of heat resistance, weather resistance and the like. The pure aluminum plating layer has poor processability due to the fact that the alloy layer is thick, the pure aluminum plating layer is mainly used as an aluminum-silicon alloy plating layer, silicon is 5-11% generally, and the balance is mainly aluminum.
The traditional aluminum and aluminum alloy coating products are mainly divided into two categories, one is a hot forming product which needs high-temperature heat treatment and aims to protect a substrate from being oxidized or decarburized by utilizing the heat resistance of an aluminum alloy coating, and the other is a heat-resistant non-hot forming product such as an oven, a microwave oven, an automobile exhaust pipe and the like, but the strength of the product is generally low. With the increase of downstream user demands, the demands for high-corrosion-resistance, high-strength and high-elongation products are more and more vigorous, but hot-dip aluminum and alloy products of high-strength and low-alloy are still blank
Chinese patents CN202029691U and CN205086673U disclose the use of aluminum plated plates as fuel tanks, but no report is made on the performance of the materials. Chinese patent CN108866529A discloses an environmental-friendly passivated aluminium-plated silicon steel sheet with excellent corrosion resistance and high temperature resistance, which mainly studies the action of passivation solution and passivation layer, and the corrosion resistance mainly aims at the salt spray test and performance.
Chinese patent CN104651590A discloses an aluminum or aluminum alloy coated hot forming material and a manufacturing method thereof, chinese patent CN101583486 discloses a hot stamping product of a coated steel strip and a method thereof, and chinese patent CN100370054 discloses a high strength aluminum or aluminum alloy plated steel plate, which are all hot forming products, and do not relate to the application of aluminum and alloy plated products in the non-hot forming field at all.
Disclosure of Invention
The invention aims to provide a high-strength low-alloy hot-dip aluminum alloy steel strip and a manufacturing method thereof, wherein the steel strip has high strength and high toughness under the condition of adopting a lower alloy system, and has good corrosion resistance, heat resistance, processability and plating layer adhesive force; the yield strength of the steel strip is 300-600 MPa, the tensile strength is 350-800 MPa, and the elongation is more than or equal to 15%.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-strength low-alloy hot-dip aluminum alloy steel strip comprises an aluminum layer, an alloy layer and a substrate from top to bottom in sequence;
the aluminum layer has a free aluminum phase of 50% or more, Fe content of 3% or less, and manganese oxide, silicon oxide or silicomanganese oxide content of less than 1g/m at the interface between the alloy layer and the substrate2；
The Fe content in the alloy layer is 20-70%, and the weight of the alloy layer is 10-30g/m2The standard deviation satisfies 0 relative to the average value of the alloy layer weight<The standard deviation/alloy layer weight average value is less than or equal to 0.1;
the substrate comprises the following components in percentage by weight: c: 0.01 to 0.15%, Si: 0.001-0.05%, Mn: 0.05-1.0%, P: 0-0.05%, S: 0-0.02%, Ti + Nb + V + B less than or equal to 0.22%, and the balance of Fe and inevitable impurities.
Preferably, the microstructure of the substrate is ferrite or ferrite + cementite.
Preferably, the weight of the aluminum layer is 10-100g/m2。
Preferably, the yield strength of the steel strip is 300-600 MPa, the tensile strength is 350-800 MPa, and the elongation is more than or equal to 15%.
The invention relates to a manufacturing method of a high-strength low-alloy hot-dip aluminum alloy steel strip, which comprises the following steps:
1) smelting and casting
The substrate comprises the following components in percentage by weight: c: 0.01 to 0.15%, Si: 0.001 to 0.05%, Mn: 0.05-1.0%, P: 0-0.05%, S: 0-0.02%, Ti + Nb + V + B is less than or equal to 0.22%, and the balance of Fe and inevitable impurities, and smelting and casting according to the components to obtain a casting blank;
2) hot rolling, wherein the hot rolling coiling temperature is 500-650 ℃;
3) cold rolling to form a steel strip;
4) annealing and hot-dip coating: and after the treatment of the continuous annealing furnace, the zinc-plated steel plate enters a zinc pot for hot dipping, wherein the annealing temperature is 670-850 ℃, the temperature of the plated steel plate is 640-680 ℃, and the cooling speed after plating is 5-30 ℃/s.
Preferably, in the step 4), the temperature of the steel strip is 2-10 ℃ lower than the temperature of the plating solution when the steel strip is put into a zinc pot.
Preferably, in step 4), the hot dip coating time of the strip is less than 4 s.
Preferably, in step 4), the plating bath components are Si: 4-14 wt%, and the balance of Al.
Preferably, in the step 4), the strip steel is taken out of the zinc pot and then is cooled for two sections, wherein the cooling speed is 15-30 ℃/s at the temperature of 680-550 ℃, and the cooling speed is 5-30 ℃/s at the temperature of 550-150 ℃.
In the component design of the invention:
nb: by adding trace alloying element Nb, Nb can form interstitial mesophase such as NbC, NbN and the like in steel, and pinning of relative dislocation of the mesophase and inhibiting migration of subgrain boundary in the recrystallization process improve the rheological stress and yield strength of the steel, thereby achieving the purpose of strengthening the material, wherein the Nb content exceeds 0.15%, the strengthening effect is not obvious, and the cost is also increased.
Nb can be replaced by Ti, B or V, and one or more of the elements can be used, but the content of the elements is not more than 0.22%.
C: c is the most effective and cheapest strengthening element, the content of C is increased, the strength is generally increased, the effect is not obvious when the content of C is less than 0.01%, and the processability is deteriorated when the content of C is more than 0.2%.
Si and Mn mainly play a strengthening role, in order to realize low alloy and ensure the performance, the content of Si is not more than 0.05 percent, the content of Mn is not more than 1 percent, and preferably, the content of Mn is 0.05 to 1 percent.
The invention mainly improves the product strength by adopting lower alloy element content and optimizing the manufacturing process.
The invention adopts lower alloy element content, the content of manganese oxide, silicon oxide or silicon manganese oxide on the surface of the hot-dip aluminum alloy strip steel, the interface layer of the alloy layer and the substrate is lower than 1g/m2The advantages are that the binding force of the plating layer is good, and the improvement effect of the binding force of the plating layer is more obvious for the strip steel with the thickness of more than 2 mm.
The hot dip plating time is shorter than 4s, the temperature of strip steel entering a zinc pot is 2-10 ℃ lower than the temperature of plating solution, the purpose is to ensure that an alloy layer is uniformly distributed on a substrate, the problem that the alloy layer is too thick to influence the adhesion of the plating layer, the problem that the temperature of the strip steel is too low than the temperature of the plating solution to influence the platability of plating and cause plating leakage is avoided, the temperature of the strip steel is higher than the temperature of the plating solution to cause the alloy layer to be too thick, the alloy layer fluctuates along the strip steel, the local thickness is too thick, and the local thickness is too low, so the temperature of the strip steel is preferably lower than the temperature of the plating solution by 2-10 ℃, and the weight of the alloy layer is preferably 15-25 g/m2The standard deviation satisfies 0 relative to the average value of the alloy layer weight<The standard deviation/weight average value of the alloy layer is less than or equal to 0.1, wherein the Fe content in the alloy layer is 20-70%.
The plating solution adopted by the invention comprises the following components: 4-14 wt%, and the balance of Al. The purpose of the silicon is mainly to reduce the weight of the alloy layer and improve the uniformity of the alloy layer, the effect is basically saturated and is lower than 4 percent when the content is higher than 14 percent, the effect is difficult to guarantee, therefore, the content of the Si is preferably 4-14 percent, meanwhile, under the plating solution component system, the free aluminum phase in the aluminum layer in the obtained aluminum alloy plating layer accounts for more than 50 percent, and meanwhile, the content of the Fe in the aluminum layer is lower than 3 percent, so that the good corrosion resistance of the hot-dip aluminum alloy steel strip is guaranteed.
The cooling speed of the strip steel after being discharged from a zinc pot is controlled in stages, the cooling speed between 680 and 550 ℃ is 15-30 ℃/s, and the cooling speed between 550 and 150 ℃ is 5-30 ℃/s, because the cooling speed is between 680 and 550 ℃, an aluminum alloy coating is not completely solidified, the cooling speed is improved, nucleation points can be increased, crystal grains are refined, the weight and the uniformity of an aluminum layer are ensured, and the proportion of free aluminum phases in the aluminum layer and the Fe content in the aluminum layer are ensured. The mechanical property of the product is mainly ensured at 550-150 ℃, and the cooling speed can be flexibly adjusted according to the requirement to obtain the high-strength product under a low alloy component system.
The invention has the beneficial effects that:
the base plate is low in alloy element, appropriate quality components are provided from the aspects of economy and effectiveness, the material with high strength and excellent surface performance is obtained, the yield strength of the obtained material is 300-600 MPa, the tensile strength is 350-800 MPa, and the elongation is more than or equal to 15%.
The aluminum alloy layer has the advantages of thin and uniform weight, excellent coating adhesive force, more obvious advantage on thick products and capability of improving the product processability.
The hot-dip aluminized alloy coating has high free aluminum phase and excellent corrosion resistance.
Drawings
FIG. 1 shows a structure of a high-strength low-alloy hot-dip aluminum alloy coated steel substrate according to the present invention.
FIG. 2 is a cross-sectional view of the high-strength low-alloy hot-dip aluminum alloy strip steel coating of the present invention.
Detailed Description
The invention is further described below with reference to examples and figures.
Table 1 shows the composition of steel sheets according to examples of the present invention; table 2 shows the manufacturing process of the inventive example; table 3 shows the mechanical properties of the examples of the present invention.
Smelting the chemical components shown in the table 1, casting a blank, hot rolling, coiling, and then rolling, feeding into a continuous annealing furnace, degreasing, cleaning, air drying before feeding into a continuous annealing furnace, wherein the atmosphere in the continuous annealing furnace is H2: 1-5%, and the balance is N2, feeding into a zinc pot after the continuous annealing furnace is subjected to heat treatment, the temperature of a plating solution is 650-680 ℃, obtaining a proper thickness value of the plating layer by controlling an air knife, cooling after the plating solution is discharged from the zinc pot, and finally performing post-treatment such as oil coating and passivation to obtain the product.
The hot-dip aluminized and aluminum alloy steel strip substrate obtained by the invention has uniform ferrite and cementite structures, as shown in figure 1, the surface is fine and uniform silvery spangles, the coating comprises an alloy layer and a surface layer close to a matrix, and the surface layer mainly comprises an aluminum phase and an aluminum-silicon phase, as shown in figure 2.
TABLE 1
| Examples | C | Si | Mn | P | S | Ti | B | Nb | V |
| 1 | 0.061 | 0.020 | 0.07 | 0.002 | 0.009 | - | 0.0031 | 0.020 | - |
| 2 | 0.020 | 0.030 | 0.90 | 0.015 | 0.001 | 0.13 | 0.0040 | - | - |
| 3 | 0.080 | 0.025 | 0.85 | 0.020 | 0.004 | - | 0.0052 | 0.025 | 0.080 |
| 4 | 0.140 | 0.020 | 0.70 | 0.025 | 0.010 | - | 0.0620 | 0.140 | 0.005 |
| 5 | 0.082 | 0.045 | 0.30 | 0.030 | 0.020 | - | - | 0.040 | - |
| 6 | 0.070 | 0.0015 | 0.85 | 0.024 | 0.015 | - | - | - | 0.06 |
TABLE 2
TABLE 3
Claims (7)
1. A high-strength low-alloy hot-dip aluminum alloy steel strip is characterized by comprising an aluminum layer, an alloy layer and a substrate from top to bottom in sequence;
the aluminum layer has a free aluminum phase of 50% or more, Fe content of 3% or less, and manganese oxide, silicon oxide or silicomanganese oxide content of less than 1g/m at the interface between the alloy layer and the substrate2；
The Fe content in the alloy layer is 20-70%, and the weight of the alloy layer is 10-30g/m2The standard deviation satisfies 0 relative to the average value of the alloy layer weight<The standard deviation/alloy layer weight average value is less than or equal to 0.1;
the substrate comprises the following components in percentage by weight: c: 0.01 to 0.15%, Si: 0.001-0.05%, Mn: 0.05-1.0%, P: 0-0.05%, S: 0-0.02%, Ti + Nb + V + B less than or equal to 0.22%, and the balance of Fe and inevitable impurities.
2. The high strength low alloy hot dip aluminum alloy coated steel strip as claimed in claim 1, wherein the microstructure of the substrate is ferrite or ferrite + cementite.
3. The high-strength low-alloy hot-dip aluminum alloy steel strip as recited in claim 1 or 2, wherein the aluminum layer has a weight of 10 to 100g/m2。
4. The high-strength low-alloy hot-dip aluminum alloy steel strip as claimed in claim 1, 2 or 3, wherein the yield strength of the steel strip is 300 to 600MPa, the tensile strength is 350 to 800MPa, and the elongation is not less than 15%.
5. The method for producing a high-strength low-alloy hot-dip aluminum alloy steel strip as claimed in any one of claims 1 to 4, comprising the steps of:
1) smelting and casting
The substrate comprises the following components in percentage by weight: c: 0.01 to 0.15%, Si: 0.001-0.05%, Mn: 0.05-1.0%, P: 0-0.05%, S: 0-0.02%, Ti + Nb + V + B is less than or equal to 0.22%, and the balance of Fe and inevitable impurities, and smelting and casting according to the components to obtain a casting blank;
2) hot rolling, wherein the coiling temperature of the hot rolling is 500-650 ℃;
3) cold rolling to form a steel strip;
4) annealing and hot-dip coating: after treatment in a continuous annealing furnace, putting the zinc-plated steel into a zinc pot for hot dipping, wherein the annealing temperature is 670-850 ℃, and the plating solution temperature is 640-680 ℃; when the steel strip is put into a zinc pot, the temperature of the steel strip is 2-10 ℃ lower than the temperature of the plating solution;
and (3) after the strip steel is taken out of the zinc pot, carrying out two-stage cooling, wherein the cooling speed is 15-30 ℃/s at 680-550 ℃, and the cooling speed is 5-30 ℃/s at 550-150 ℃.
6. The method for producing a high-strength low-alloy hot-dip aluminum alloy steel strip as claimed in claim 5, wherein the hot-dip coating time of the steel strip in the step 4) is less than 4 seconds.
7. The method for producing a high-strength low-alloy hot-dip aluminum alloy steel strip as claimed in claim 5, wherein in the step 4), the bath composition is Si: 4-14 wt%, and the balance of Al.
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