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CN114875336A - Production regulation and control method of plasticizing hot-dip galvanized complex-phase steel - Google Patents

Production regulation and control method of plasticizing hot-dip galvanized complex-phase steel Download PDF

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CN114875336A
CN114875336A CN202210611182.0A CN202210611182A CN114875336A CN 114875336 A CN114875336 A CN 114875336A CN 202210611182 A CN202210611182 A CN 202210611182A CN 114875336 A CN114875336 A CN 114875336A
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steel
equal
hot
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侯晓英
孙丽荣
刘万春
展英姿
初林
任东
康华伟
曹光明
郝亮
王鹏
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SD Steel Rizhao Co Ltd
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    • 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
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    • 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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    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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    • C21—METALLURGY OF IRON
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
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    • 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
    • C21D2211/002—Bainite
    • 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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Abstract

The invention discloses a production regulation and control method of plasticizing hot-dip galvanized complex phase steel, which comprises the following steps: the steel billet vanadium microalloying treatment process comprises the following steps: C-Si-Mn is used as a basic component, 0.18-0.22% of vanadium microalloy is added, and the nitrogen content is increased to 0.018-0.022%; a hot rolling initial structure regulating procedure: the finish rolling temperature is 885 +/-15 ℃, and then the steel is cooled to 600 +/-15 ℃ at a cooling rate of 20-30 ℃/s for coiling; acid rolling regulation and control procedure: pickling the hot rolled steel coil to remove oxides on the surface of the strip steel, and then cold rolling by adopting the rolling reduction of more than or equal to 50.0% to ensure that the reflectivity of the surface of the pickled strip steel reaches more than or equal to 65%; an annealing microstructure regulating and controlling procedure: the austenitizing annealing temperature is 900-920 ℃, the slow cooling outlet temperature is 680 +/-10 ℃, and after the slow cooling is finished, the steel is rapidly cooled to 395 +/-15 ℃ at a cooling speed of more than or equal to 35 ℃/s; the temperature is quickly raised to 465 +/-5 ℃ by adopting induction heating, the temperature is 465 +/-5 ℃ when the galvanized steel strip enters a zinc pot, and the galvanized steel strip is cooled to be less than or equal to 150 ℃ by adopting a movable air box after the galvanized steel strip is discharged from the zinc pot.

Description

Production regulation and control method of plasticizing hot-dip galvanized complex-phase steel
Technical Field
The invention belongs to the technical field of cold-rolled advanced high-strength steel materials for automobiles, and particularly relates to a production regulation and control method of plasticizing hot-dip galvanized complex-phase steel.
Background
In order to achieve the great targets of 'carbon peak reaching' in 2030 and 'carbon neutralization' in 2060 by assisting power, the automobile industry depends on weight reduction to meet the requirements of energy conservation, emission reduction and low-carbon transformation, and is still urgent. Research shows that when the weight of an automobile is reduced by 100 kilograms, the carbon emission can be reduced by about 8.5g/100 kilometers, and the application of (ultra) high strength on a white automobile body can obviously reduce the weight of the automobile, and the complex phase steel has the following characteristics, so the complex phase steel is concerned by relevant research and development personnel of automobile main engine plants, matching plants and steel enterprises: firstly, the multiphase microstructure characteristic of the multiphase steel can effectively improve the hole expansion performance of the material; secondly, the complex phase steel of the bainite matrix has better reaming and flanging capability due to the existence of high-density dislocation and smaller strength difference among phase structures; and thirdly, the complex phase steel has higher yield ratio, and compared with other high-strength materials of the same grade, the complex phase steel has enhanced deformation resistance, and is particularly suitable for manufacturing automobile safety parts.
The patent No. CN 113528978A provides ' 980 MPa-grade galvanized complex phase steel and a preparation method thereof ', compared with the invention, the elongation A50 of the steel is less than or equal to 18%, while the invention is ' plasticizing ' hot-dip galvanized complex phase steel, the elongation is more than 19% and the product of strength and elongation is more than 20.5GPa ' under the condition that the tensile strength is more than 1000 MPa.
Patent No. CN 110129668B provides 'a 1000 MPa-grade alloying hot-dip galvanizing complex phase steel and a preparation method thereof', compared with the invention, the invention mainly has the following differences: 1) the elongation of CN 110129668B is less than or equal to 14 percent, and the invention is 'plasticizing' hot galvanizing complex phase steel, the elongation is more than 19 percent and the product of strength and elongation is more than 20.5GPa DEG under the condition of ensuring the tensile strength to be more than 1000 MPa. 2) Different preparation processes inevitably cause different microstructure regulation mechanisms. CN 110129668B is suitable for an alloying hot galvanizing production line, and the alloying temperature is 510-530 ℃; the invention is suitable for hot galvanizing production lines, and the temperature of the zinc pot is 465 +/-5 ℃. 3) CN 110129668B is high in cost, and needs to be added with a large amount of microalloy elements, wherein the microalloy elements comprise 0.2-0.5% of Cr, 0.1-0.4% of Mo, 0.03-0.06% of Ti and 0.03-0.05% of Nb. 4) The process design principle is different, and the microstructure of CN 110129668B comprises (30-60%) ferrite, (15-35%) bainite and (25-35%) martensite; the microstructure of the invention after the annealing production process is regulated to 56-67% of bainite, (19-29%) of ferrite and more than or equal to 14.0% of grain boundary retained austenite, and V (C, N) particles with the diameter less than or equal to 12nm are dispersed in a matrix.
The patent number is CN 113528946A, a 1200 MPa-grade reinforced forming complex phase steel and a preparation method thereof, and the patent number is CN 112251668A, a forming reinforced complex phase steel and a preparation method thereof, both provide the preparation method of the forming reinforced complex phase steel, and the elongation after fracture is 8-13% and 10-15% respectively. The invention is 'plasticizing' hot galvanizing complex phase steel, and under the condition of ensuring that the tensile strength is more than 1000MPa, the elongation is more than 19 percent, and the product of strength and elongation is more than 20.5 GPa.
From the related patents disclosed currently, no feasible production control method for plasticizing hot dip galvanizing complex phase steel is provided.
Disclosure of Invention
The invention aims to provide a production regulation and control method of plasticity-increasing hot-dip galvanized complex phase steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production regulation and control method of plasticizing hot galvanizing complex phase steel comprises the following steps:
1) the steel billet vanadium microalloying treatment process comprises the following steps: C-Si-Mn is used as a basic component, 0.18-0.22% of vanadium microalloy is added, and the nitrogen content is increased to 0.018-0.022%;
2) a hot rolling initial structure regulating procedure: the finish rolling temperature is 885 +/-15 ℃, and then the steel is cooled to 600 +/-15 ℃ at a cooling rate of 20-30 ℃/s for coiling;
3) acid rolling regulation and control procedure: pickling the hot rolled steel coil to remove oxides on the surface of the strip steel, and then cold rolling by adopting the rolling reduction of more than or equal to 50.0% to ensure that the reflectivity of the surface of the pickled strip steel reaches more than or equal to 65%;
4) an annealing microstructure regulating and controlling procedure: the austenitizing annealing temperature is 900-920 ℃, the slow cooling outlet temperature is 680 +/-10 ℃, and after the slow cooling is finished, the steel is rapidly cooled to 395 +/-15 ℃ at a cooling speed of more than or equal to 35 ℃/s; the temperature is quickly raised to 465 +/-5 ℃ by adopting induction heating, the temperature is 465 +/-5 ℃ when the galvanized steel strip enters a zinc pot, and the galvanized steel strip is cooled to be less than or equal to 150 ℃ by adopting a movable air box after the galvanized steel strip is discharged from the zinc pot.
Specifically, the chemical composition of the steel billet is as follows by mass percent: 0.10 to 0.14%, Si: 0.6-0.8%, Mn: 2.2-2.5%, V: 0.18-0.22%, N: 0.018-0.022%, Alt: 0.60-0.80%, and limits P to be less than or equal to 0.005%, S to be less than or equal to 0.005%, O to be less than or equal to 0.005%, and the balance being Fe and other inevitable impurities.
Specifically, in the step 2), the hot rolling initial structure is regulated to be a mixed structure of 35-55% of ferrite, 15-25% of pearlite and 20-50% of acicular bainite, so that the microalloy vanadium exists in a matrix in a solid solution state.
Specifically, in the step 4), the temperature of a pre-oxidation chamber pipeline is preheated to 720-730 ℃, the flow rate of compressed air is more than or equal to 40m3/h, the flow rate of a circulating fan is more than or equal to 340m3/h, the dew point of a furnace nose is less than or equal to-35 ℃, and the dew point of a soaking section is less than or equal to-35 ℃ so as to ensure the surface quality of hot-dip galvanized complex phase steel.
Specifically, the microstructure regulated and controlled in the step 4) comprises 56-67% of bainite, 19-29% of ferrite and more than or equal to 14.0% of grain boundary retained austenite, and V (C, N) particles with the diameter less than or equal to 12nm are dispersed in a matrix.
Specifically, the hot-dip galvanized complex phase steel has an elongation rate of more than 19% and a product of strength and elongation of more than 20.5GPa DEG under the condition of ensuring that the tensile strength is more than 1000 MPa.
The invention has the following beneficial effects: regulating and controlling the hot rolling initial microstructure into a mixed structure of (35-55)% ferrite, (15-25)% pearlite and (20-50)% acicular bainite, and ensuring that the microalloy vanadium exists in a matrix in a solid solution state; the microstructure after the annealing production process is regulated to 56-67% of bainite, (19-29%) of ferrite and more than or equal to 14.0% of grain boundary retained austenite, and V (C, N) particles with the diameter less than or equal to 12nm are dispersed in a matrix; the hot-dip galvanized complex phase steel prepared by the technical scheme has the elongation rate of more than 19 percent and the product of strength and elongation of more than 20.5GPa DEG under the condition of ensuring the tensile strength of more than 1000 MPa.
Drawings
FIG. 1 shows the morphology of the hot-rolled initial microstructure of the plasticized hot-dip galvanized complex phase steel produced in example 3-I.
FIG. 2 is a typical micro-scanning microstructure of the plasticized hot dip galvanized complex phase steel produced in example 3-I.
FIG. 3 is a typical morphology feature diagram of retained austenite of the plasticized hot-dip galvanized complex phase steel produced in example 3-I under a transmission electron microscope.
FIG. 4 is a TEM morphology of V (C, N) dispersion precipitation of the plasticization hot dip galvanized complex phase steel produced in example 3-I under a transmission electron microscope.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
Examples 1 to 4: a production regulation and control method of plasticity-increasing hot-dip galvanized complex phase steel is characterized by comprising C-Si-Mn serving as a basic component, adding 0.18-0.22% of vanadium microalloy and increasing the nitrogen content to 0.018-0.022%. The chemical composition of the steel billet comprises the following components in percentage by mass: 0.10 to 0.14%, Si: 0.6-0.8%, Mn: 2.2-2.5%, V: 0.18-0.22%, N: 0.018-0.022%, Alt: 0.60 to 0.80%, and P is limited to 0.005% or less, S is limited to 0.005% or less, O is limited to 0.005% or less, and the balance is Fe and other unavoidable impurities, but the embodiment of the present step is not limited thereto.
Examples C Si Mn V N Alt P S O
1 0.12 0.80 2.4 0.18 0.020 0.60 0.004 0.005 0.003
2 0.14 0.60 2.2 0.22 0.018 0.72 0.005 0.003 0.004
3 0.10 0.74 2.5 0.19 0.022 0.80 0.003 0.005 0.005
4 0.12 0.63 2.2 0.21 0.021 0.68 0.004 0.003 0.005
Table 1 actual smelting Components (mass%,%)
A production regulation and control method of plasticizing hot galvanizing complex phase steel comprises the following steps:
a hot rolling initial structure regulating procedure: and the finish rolling temperature is 885 +/-15 ℃, and then the steel is cooled to 600 +/-15 ℃ at a cooling speed of 20-30 ℃/s for coiling.
Acid rolling regulation and control procedure: and pickling the hot rolled steel coil to remove oxides on the surface of the strip steel, and then carrying out cold rolling by adopting the reduction of more than or equal to 50.0 percent, wherein the reflectivity of the surface of the strip steel after pickling is ensured to be more than or equal to 65 percent.
An annealing microstructure regulating and controlling procedure: preheating the temperature of a pre-oxidation chamber pipeline to 720-730 ℃, wherein the flow of compressed air is more than or equal to 40m 3 The flow of the circulating fan is more than or equal to 340m 3 The furnace nose dew point is less than or equal to minus 35 ℃, and the soaking section dew point is less than or equal to minus 35 ℃ so as to ensure the surface quality of the hot-galvanized complex phase steel; the austenitizing annealing temperature is 900-920 ℃, the slow cooling outlet temperature is 680 +/-10 ℃, and after the slow cooling is finished, the steel is rapidly cooled to 395 +/-15 ℃ at a cooling speed of more than or equal to 35 ℃/s; then quickly heating to 465 +/-5 ℃ by adopting induction heating, entering a zinc pot at the temperature of 465 +/-5 ℃, and cooling the galvanized steel strip to be less than or equal to 150 ℃ by adopting a movable air box after being discharged from the zinc pot. The specific process parameters of practical production of inventive examples 1-4 are shown in Table 2.
Figure BDA0003672088480000041
Table 2 main process control parameters of the examples
In the procedure of controlling the hot rolling initial structure, the microstructure and the morphology of the test steel sample are analyzed, and it can be observed by an Axio ScopeA1 Optical Microscope (OM), the hot rolling initial microstructure of the plasticity-increasing hot-dip galvanized complex phase steel mainly comprises (35-55)% ferrite, (15-25)% pearlite and (20-50)% needle-like bainite, fig. 1 shows the microstructure of the hot rolling initial microstructure of the plasticity-increasing hot-dip galvanized complex phase steel produced in example 3-I, wherein F: ferrite; AF: acicular ferrite; p: pearlite.
The prepared plasticizing hot-dip galvanized complex-phase steel is sampled to carry out microstructure analysis and mechanical property test, and the test and analysis results are shown in table 3. The hot-dip galvanized complex phase steel prepared by the technical scheme has the elongation rate of more than 19 percent and the product of strength and elongation of more than 20.5GPa DEG under the condition of ensuring the tensile strength of more than 1000 MPa.
Figure BDA0003672088480000042
TABLE 3 mechanical Properties and microstructure volume fractions of the examples
The microstructure after the annealing production process is regulated to 56-67% of bainite, (19-29%) of ferrite and more than or equal to 14.0% of grain boundary retained austenite, and V (C, N) particles with the diameter less than or equal to 12nm are dispersed in the matrix. FIG. 2 is a typical micro-scanning microstructure of the plasticized hot dip galvanized complex phase steel produced in example 3-I, wherein the volume fraction of grain boundary residue gamma is 16.4%, and F: ferrite; b: bainite; residual gamma: retained austenite. FIG. 3 is a typical morphology feature diagram of grain boundary retained austenite of the plasticized hot-dip galvanized complex phase steel produced in example 3-I under a transmission electron microscope, wherein (a) is the morphology feature of the retained austenite; (b) the dark field image of (a).
It can be observed under a transmission electron microscope that V (C, N) in the matrix is dispersedly distributed in the matrix, and the diameter of precipitated particles is less than or equal to 12nm, and FIG. 4 is a TEM morphology picture of V (C, N) dispersedly precipitated in the transmission electron microscope of the plasticizing hot-dip galvanized complex phase steel produced in example 3-I.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims (6)

1. A production regulation and control method of plasticizing hot galvanizing complex phase steel is characterized by comprising the following steps:
1) the steel billet vanadium microalloying treatment process comprises the following steps: C-Si-Mn is used as a basic component, 0.18-0.22% of vanadium microalloy is added, and the nitrogen content is increased to 0.018-0.022%;
2) a hot rolling initial structure regulating procedure: the finish rolling temperature is 885 +/-15 ℃, and then the steel is cooled to 600 +/-15 ℃ at a cooling rate of 20-30 ℃/s for coiling;
3) acid rolling regulation and control procedure: pickling the hot rolled steel coil to remove oxides on the surface of the strip steel, and then cold rolling by adopting the rolling reduction of more than or equal to 50.0% to ensure that the reflectivity of the surface of the pickled strip steel reaches more than or equal to 65%;
4) an annealing microstructure regulating and controlling procedure: the austenitizing annealing temperature is 900-920 ℃, the slow cooling outlet temperature is 680 +/-10 ℃, and after the slow cooling is finished, the steel is rapidly cooled to 395 +/-15 ℃ at a cooling speed of more than or equal to 35 ℃/s; the temperature is quickly raised to 465 +/-5 ℃ by adopting induction heating, the temperature is 465 +/-5 ℃ when the galvanized steel strip enters a zinc pot, and the galvanized steel strip is cooled to be less than or equal to 150 ℃ by adopting a movable air box after the galvanized steel strip is discharged from the zinc pot.
2. The production control method of the plasticizing hot-dip galvanized complex phase steel according to claim 1, characterized in that the chemical composition of the steel billet is C: 0.10 to 0.14%, Si: 0.6-0.8%, Mn: 2.2-2.5%, V: 0.18-0.22%, N: 0.018-0.022%, Alt: 0.60-0.80%, and limits P to be less than or equal to 0.005%, S to be less than or equal to 0.005%, O to be less than or equal to 0.005%, and the balance being Fe and other inevitable impurities.
3. The production control method of the plasticity-enhancing hot dip galvanized complex phase steel according to claim 1, characterized in that the hot rolling initial structure in the step 2) is controlled to be a mixed structure of 35-55% of ferrite, 15-25% of pearlite and 20-50% of acicular bainite, so that the microalloy vanadium exists in a matrix in a solid solution state.
4. The complex phase plasticizing hot dip galvanizing method according to claim 1The production regulation and control method of steel is characterized in that in the step 4), the temperature of a pipeline of a pre-oxidation chamber is preheated to 720-730 ℃, and the flow of compressed air is more than or equal to 40m 3 The flow of the circulating fan is more than or equal to 340m 3 The furnace nose dew point is less than or equal to minus 35 ℃, and the soaking section dew point is less than or equal to minus 35 ℃ so as to ensure the surface quality of the hot-dip galvanized complex phase steel.
5. The production regulating method of the plasticity-enhancing hot dip galvanized complex phase steel according to claim 1, characterized in that the microstructure regulated and controlled in the step 4) is 56-67% of bainite, 19-29% of ferrite and more than or equal to 14.0% of grain boundary retained austenite, and V (C, N) particles with the diameter of less than or equal to 12nm are dispersed in a matrix.
6. The production control method of the plasticity-enhancing hot-dip galvanized complex phase steel as claimed in claim 1, wherein the elongation of the hot-dip galvanized complex phase steel is more than 19% and the product of strength and elongation is more than 20.5 GPa% under the condition that the tensile strength is more than 1000 MPa.
CN202210611182.0A 2022-05-31 2022-05-31 Production regulation and control method of plasticizing hot-dip galvanized complex-phase steel Pending CN114875336A (en)

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