CN111850362A - High-strength aluminum plate strip and production method thereof - Google Patents

High-strength aluminum plate strip and production method thereof Download PDF

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Publication number
CN111850362A
CN111850362A CN202010731661.7A CN202010731661A CN111850362A CN 111850362 A CN111850362 A CN 111850362A CN 202010731661 A CN202010731661 A CN 202010731661A CN 111850362 A CN111850362 A CN 111850362A
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strip
rolling
aluminum
temperature
strength
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刘少峰
黄荣清
何炳智
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Foshan Jinlan Aluminum Factory Co Ltd
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Foshan Jinlan Aluminum Factory Co Ltd
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Priority to CN202010731661.7A priority Critical patent/CN111850362A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B47/00Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/01Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/012Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling

Abstract

The invention provides a high-strength aluminum plate strip and a production method thereof, the high-strength aluminum plate strip can effectively improve the strength on the premise of ensuring the production cost by compositely rolling an aluminum strip and a steel strip with a specific weight ratio, can bear larger extrusion stress and shearing stress in actual use, and has good wear resistance, high toughness and light weight; the aluminum strip is prepared in advance, and the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling are adopted, so that the rolling structure and performance can be effectively improved, the coarse crystal of the structure is crushed through multiple hot rolling, the structure is densified, the metal crystal grains are crushed and reduced through multiple cold rolling, the strength is improved, no additional production equipment is needed, the plasticity of the aluminum strip is improved, and the aluminum strip with obviously improved strength can be obtained through the process control of the hot rolling and the cold rolling; the embedded groove is formed in the width direction of the steel strip, and the prepared aluminum strip is placed in the embedded groove to form an embedded connection relation, so that the rolling and compounding through a binding machine are realized, and the yield is improved on the whole.

Description

High-strength aluminum plate strip and production method thereof
Technical Field
The invention relates to the field of metal material casting, in particular to a high-strength aluminum plate strip and a production method thereof.
Background
The aluminum strip is high in preparation requirement on the market, high in required strength, capable of bearing larger extrusion stress and shearing stress, good in wear resistance and high in toughness, but at present, most of aluminum strips are forged, cast or tailor-welded by using traditional high-strength single metal materials, and the use requirements of light weight, high strength and long service life cannot be met by simply using aluminum alloy or high-strength steel. In addition, the alloy strip produced in the prior art in a composite mode has the defects of uneven upper and lower structures, thick and thick product crystalline structure, influence on product quality and low yield of the prepared aluminum strip.
For example, patent No. CN101045970A discloses a new high-strength heat-resistant aluminum alloy, which has low strength, poor heat resistance and poor wear resistance; for another example, patent No. CN108707790A discloses a high-strength cast aluminum alloy, which solves the problem that in the prior art, the aluminum alloy casting has compact structure and is easy to produce segregation agent casting strength. However, the above-mentioned solutions do not satisfy the requirements of high strength and light weight at the same time.
In the field of preparation, many practical problems to be solved in practical application still have no specific solutions.
Disclosure of Invention
The invention provides a high-strength aluminum plate strip and a production method thereof, and aims to solve the problems that in the prior art, a material which is light in weight, high in strength and long in service life cannot be prepared by using a single aluminum alloy or high-strength steel, and the prepared material is uneven in structure and low in yield.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-strength aluminum plate strip is prepared by compounding and hot-pressing an aluminum strip and a steel strip, and the mass ratio of the aluminum strip to the steel strip is 1-10: 1-2;
optionally, the aluminum strip comprises the following chemical components in percentage by mass: si: 0.01-0.11%, Fe: 0.06-0.21%, Cu: 0.15-0.24%, Mn: 0.32-0.48%, Mg: 3.5-4.6%, Cr: 0.005-0.01%, Ti: 0.01-0.03%, Zn: 0.20-0.46%, La: 0.001-0.003 percent of the total weight of the raw materials, and 0.001-0.014 percent of the total weight of the raw materials; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
Optionally, the steel strip comprises the following chemical components in percentage by mass: si: 0.01-0.10%, Mn: 0.5-0.7%, Ti 0.02-0.11%, C: 0.01-0.09%, P: 0.001-0.01%, S0.001-0.01%, Nb: 0.01-0.035%, B: 0.0002 to 0.001 percent, and the balance of Fe and inevitable impurities;
in addition, the invention also provides a production method of the high-strength aluminum plate strip, which comprises the following steps:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then performing semi-continuous casting at the temperature of 700-; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from the heating furnace until the temperature of the plate is 1000-1100 ℃, wherein the reduction rate is 15-55%, and rolling the plate within 10-30s at the temperature of 900-1100 ℃ to obtain the steel strip;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 40-75% under the condition that the hot pressing temperature is 300-500 ℃;
s5, carrying out recrystallization annealing on the material subjected to the S4;
and S6, coiling the material obtained in the step S5, slitting, and finishing to obtain the aluminum plate strip.
Optionally, the temperature in the smelting furnace is 680-750 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy at the stirring speed of 5000-: the stirring speed is 500-1000 r/min.
Optionally, the rolling deformation of the first hot rolling is 45-90%, the temperature is 250-300 ℃, and the material with the thickness of 25-30mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 10-55% after the material is cooled to the room temperature at the cooling speed of 15-20 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 20-90%, the temperature is controlled to be 310-; and after the second hot rolling is finished, the cooling speed is controlled to be 15-20 ℃/s, and the rolling speed is controlled to be 15-18 m/s.
Optionally, the annealing treatment is: and heating the material subjected to the second cold rolling to 350-380 ℃, and preserving heat for 5-8h under the temperature condition.
Optionally, in S3, the at least one caulking groove has a width larger than that of the aluminum strip.
Optionally, in S4, the pressure of the rolling is 900-1100t, and the speed of the rolling is 10-20 m/min.
Optionally, in S5, the temperature of the recrystallization annealing is 450-490 ℃, and the heat preservation time is 7-9 h;
alternatively, in S6, the coiling temperature is controlled at 550-610 ℃.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the aluminum strip prepared by the invention can improve the strength by compositely rolling the aluminum strip and the steel strip, has the advantages of light weight and long service life, can bear larger extrusion stress and shearing stress in actual use, and has good wear resistance and high toughness.
2. According to the invention, through preparing the aluminum strip in advance, and through the treatment processes of the first hot rolling, the first cold rolling, the second hot rolling and the second cold rolling, the rolling structure and performance can be effectively improved, the coarse grains of the structure are crushed through multiple hot rolling, the structure is densified, the metal grains are crushed and reduced through multiple cold rolling, the strength is improved, the plasticity of the aluminum strip can be comprehensively improved, no additional production equipment is required, and the aluminum strip with obviously improved strength can be obtained through the process control of the hot rolling and the cold rolling.
3. According to the invention, the caulking groove is formed in the width direction of the steel strip, the prepared aluminum strip is placed in the caulking groove to form a scarf joint relation, rolling and compounding are carried out through a binding machine, the comprehensive performance of the aluminum strip can be effectively improved, recrystallization annealing can promote fusion between the aluminum strip and the steel strip, the contact surface is uniform in structure, crystals are fine, and the production yield is further improved.
4. The invention rolls the aluminum strip and the steel strip in a specific mass ratio in a compounding way, can obtain better strength, can control the production cost on the premise of ensuring that the aluminum strip and the steel strip meet the use requirements of the market, and can obtain better economic benefit.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of a method for producing a high-strength aluminum plate strip according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention relates to a high-strength aluminum plate strip and a production method thereof, and the following examples are explained according to a figure 1:
example 1:
the embodiment provides a high-strength aluminum plate strip, which comprises an aluminum strip and a steel strip which are prepared by composite hot pressing, wherein the mass ratio of the aluminum strip to the steel strip is 1: 1;
in a preferred embodiment, the aluminum strip comprises the following chemical components in percentage by mass: si: 0.01%, Fe: 0.06%, Cu: 0.24%, Mn: 0.32%, Mg: 4.6%, Cr: 0.01%, Ti: 0.01%, Zn: 0.20%, La: 0.003 percent and Ce0.001 percent; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
In a preferred embodiment, the steel strip comprises the following chemical components in percentage by mass: si: 0.10%, Mn: 0.5%, Ti 0.02%, C: 0.09%, P: 0.01%, S: 0.01%, Nb: 0.035%, B: 0.0002%, the balance being Fe and unavoidable impurities;
in addition, in a preferred embodiment, a method for producing a high-strength aluminum plate strip is also provided, and the method comprises the following steps:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then semi-continuously casting the aluminum alloy liquid into an aluminum alloy ingot at 750 ℃, and then keeping the temperature of the aluminum alloy ingot at 700 ℃ to prepare a plate; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
the temperature in the smelting furnace is 680 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy liquid at a stirring speed of 5000r/min until the molten aluminum alloy liquid is melted, and adjusting the stirring conditions when the molten aluminum alloy liquid is ready to be introduced into a launder as follows: stirring at 500 r/min;
the rolling deformation of the first hot rolling is 45%, the temperature is 250 ℃, and a material with the thickness of 25mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 10 percent after the material is cooled to the room temperature at the cooling speed of 15 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 20%, the temperature is 310 ℃, and a material with the thickness of 20mm is obtained after the second hot rolling; and after the second hot rolling is finished, the cooling speed is controlled to be 20 ℃/s, and the rolling speed is controlled to be 15 m/s.
The annealing treatment comprises the following steps: heating the material subjected to the second cold rolling to 380 ℃, and preserving heat for 5 hours under the temperature condition;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from a heating furnace until the temperature of the plate is 1000 ℃, controlling the reduction rate to be 55%, and rolling the plate within 10s at the temperature of 900 ℃ to obtain the steel strip; in detail, the smelting is carried out in a smelting furnace, the smelting temperature is 1000 ℃, and then molten steel in the smelting furnace is discharged out of the furnace and cast into a blank;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip; the width of the at least one caulking groove is larger than that of the aluminum strip; in the preferred embodiment, the surface activation treatment of the steel strip is: placing the steel strip at the temperature of 500 ℃ and preserving heat for 1 h;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 40% under the condition that the hot pressing temperature is 300 ℃; the rolling pressure is 1100t, and the rolling speed is 10 m/min;
s5, carrying out recrystallization annealing on the material subjected to the S4; the temperature of the recrystallization annealing is 490 ℃, and the heat preservation time is 7 h;
s6, coiling, slitting and finishing the material obtained in the step S5 to obtain an aluminum plate strip; and the coiling temperature was controlled at 550 ℃.
Example 2:
in this embodiment, a high-strength aluminum plate strip is provided, where the high-strength aluminum plate strip is prepared by hot-pressing an aluminum strip and a steel strip in a composite manner, and a mass ratio of the aluminum strip to the steel strip is 10: 1;
in a preferred embodiment, the aluminum strip comprises the following chemical components in percentage by mass: si: 0.11%, Fe: 0.21%, Cu: 0.24%, Mn: 0.48%, Mg: 4.6%, Cr: 0.01%, Ti: 0.03%, Zn: 0.46%, La: 0.003%, Ce: 0.014%; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
In a preferred embodiment, the steel strip comprises the following chemical components in percentage by mass: si: 0.10%, Mn: 0.7%, Ti: 0.11%, C: 0.09%, P: 0.01%, S: 0.01%, Nb: 0.035%, B: 0.001%, and the balance of Fe and inevitable impurities;
in addition, in a preferred embodiment, a method for producing a high-strength aluminum plate strip is also provided, and the method comprises the following steps:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then semi-continuously casting the aluminum alloy liquid into an aluminum alloy ingot at 750 ℃, and then keeping the temperature of the aluminum alloy ingot at 700 ℃ to prepare a plate; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
the temperature in the smelting furnace is 750 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy liquid at a stirring speed of 8500r/min until the molten aluminum alloy liquid is melted, and adjusting the stirring conditions when the molten aluminum alloy liquid is ready to be introduced into a launder as follows: stirring at 1000 r/min;
the rolling deformation of the first hot rolling is 90%, the temperature is 300 ℃, and a material with the thickness of 30mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 55% after the material is cooled to the room temperature at the cooling speed of 20 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 90%, the temperature is controlled to be 350 ℃, and a material with the thickness of 20mm is obtained after the second hot rolling; and after the second hot rolling is finished, the cooling speed is controlled to be 20 ℃/s, and the rolling speed is controlled to be 18 m/s.
The annealing treatment comprises the following steps: heating the material subjected to the second cold rolling to 380 ℃, and preserving heat for 8 hours under the temperature condition;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from a heating furnace until the temperature of the plate is 1100 ℃, controlling the reduction rate to be 55%, and rolling the plate within 30s at the temperature of 1100 ℃ to obtain the steel strip; in detail, the smelting is carried out in a smelting furnace, the smelting temperature is 1600 ℃, and then molten steel in the smelting furnace is discharged out of the furnace and cast into a blank;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip; the width of the at least one caulking groove is larger than that of the aluminum strip; in the preferred embodiment, the surface activation treatment of the steel strip is: placing the steel strip at the temperature of 650 ℃ and preserving heat for 5 hours;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 75% under the condition that the hot pressing temperature is 300-500 ℃; the rolling pressure is 1100t, and the rolling speed is 20 m/min;
s5, carrying out recrystallization annealing on the material subjected to the S4; the temperature of the recrystallization annealing is 490 ℃, and the heat preservation time is 9 h;
s6, coiling, slitting and finishing the material obtained in the step S5 to obtain an aluminum plate strip; and the coiling temperature was controlled at 610 ℃.
Example 3:
the embodiment provides a high-strength aluminum plate strip, which comprises an aluminum strip and a steel strip which are prepared by composite hot pressing, wherein the mass ratio of the aluminum strip to the steel strip is 5: 1;
in a preferred embodiment, the aluminum strip comprises the following chemical components in percentage by mass: si: 0.05%, Fe: 0.11%, Cu: 0.18%, Mn: 0.39%, Mg: 4.1%, Cr: 0.008%, Ti: 0.02%, Zn: 0.31%, La: 0.002%, Ce 0.0018%; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
In a preferred embodiment, the steel strip comprises the following chemical components in percentage by mass: si: 0.05%, Mn: 0.6%, Ti 0.06%, C: 0.03%, P: 0.005%, S: 0.005%, Nb: 0.02%, B: 0.0008% of Fe and the balance of inevitable impurities;
in addition, in a preferred embodiment, a method for producing a high-strength aluminum plate strip is also provided, and the method comprises the following steps:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then performing semi-continuous casting at 720 ℃ to obtain an aluminum alloy ingot, and then insulating the aluminum alloy ingot at 600 ℃ to prepare a plate; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
the temperature in the smelting furnace is 700 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy liquid at a stirring speed of 6000r/min until the molten aluminum alloy liquid is melted, and adjusting the stirring conditions to: stirring at 600 r/min;
the rolling deformation of the first hot rolling is 45-90%, the temperature is 260 ℃, and the material with the thickness of 30mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 25% after the material is cooled to the room temperature at the cooling speed of 18 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 36%, the temperature is controlled to be 320 ℃, and a material with the thickness of 10mm is obtained after the second hot rolling; and after the second hot rolling is finished, the cooling speed is controlled to be 18 ℃/s, and the rolling speed is controlled to be 16 m/s.
The annealing treatment comprises the following steps: heating the material subjected to the second cold rolling to 370 ℃, and preserving heat for 6 hours under the temperature condition;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from a heating furnace until the temperature of the plate is 1050 ℃, controlling the reduction rate to be 35%, and rolling the plate within 25s at the temperature of 1000 ℃ to obtain the steel strip; in detail, the smelting is carried out in a smelting furnace, the smelting temperature is 1500 ℃, and then molten steel in the smelting furnace is discharged out of the furnace and cast into a blank;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip; the width of the at least one caulking groove is larger than that of the aluminum strip; in the preferred embodiment, the surface activation treatment of the steel strip is: placing the steel belt at the temperature of 620 ℃ and preserving heat for 4 hours;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 55% under the condition that the hot pressing temperature is 300-500 ℃; the rolling pressure is 1000t, and the rolling speed is 15 m/min;
s5, carrying out recrystallization annealing on the material subjected to the S4; the temperature of recrystallization annealing is 470 ℃, and the heat preservation time is 8 hours;
s6, coiling, slitting and finishing the material obtained in the step S5 to obtain an aluminum plate strip; and the coiling temperature was controlled at 580 ℃.
Example 4:
the embodiment provides a high-strength aluminum plate strip, which comprises an aluminum strip and a steel strip which are prepared by composite hot pressing, wherein the mass ratio of the aluminum strip to the steel strip is 5: 1;
in a preferred embodiment, the aluminum strip comprises the following chemical components in percentage by mass: si: 0.06%, Fe: 0.12%, Cu: 0.18%, Mn: 0.41%, Mg: 4.1%, Cr: 0.008%, Ti: 0.02%, Zn: 0.31%, La: 0.002%, Ce 0.0010%; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
In a preferred embodiment, the steel strip comprises the following chemical components in percentage by mass: si: 0.04%, Mn: 0.65%, Ti 0.10%, C: 0.08%, P: 0.006%, S: 0.005%, Nb: 0.02%, B: 0.0003%, the balance being Fe and unavoidable impurities;
in addition, in a preferred embodiment, a method for producing a high-strength aluminum plate strip is also provided, and the method comprises the following steps:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then performing semi-continuous casting at 740 ℃ to obtain an aluminum alloy ingot, and then keeping the temperature of the aluminum alloy ingot at 620 ℃ to prepare a plate; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
the temperature in the smelting furnace is 720 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy liquid at a stirring speed of 8200r/min until the molten aluminum alloy liquid is melted, and adjusting the stirring conditions when the molten aluminum alloy liquid is ready to be introduced into a launder as follows: stirring at 600 r/min;
the rolling deformation of the first hot rolling is 55%, the temperature is 260 ℃, and a material with the thickness of 25mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 30% after the material is cooled to the room temperature at the cooling speed of 18 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 40%, the temperature is controlled to be 340 ℃, and a material with the thickness of 20mm is obtained after the second hot rolling; and after the second hot rolling is finished, the cooling speed is controlled to be 16 ℃/s, and the rolling speed is controlled to be 17 m/s.
The annealing treatment comprises the following steps: heating the material subjected to the second cold rolling to 365 ℃, and preserving heat for 7 hours under the temperature condition;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from a heating furnace until the temperature of the plate is 1050 ℃, controlling the reduction rate to be 45%, and rolling the plate within 25s at the temperature of 1050 ℃ to obtain the steel strip; in detail, the smelting is carried out in a smelting furnace, the smelting temperature is 1450 ℃, and then molten steel in the smelting furnace is discharged out of the furnace and cast into a blank;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip; the width of the at least one caulking groove is larger than that of the aluminum strip; in the preferred embodiment, the surface activation treatment of the steel strip is: placing the steel belt at the temperature of 620 ℃ and preserving heat for 4 hours;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 65% under the condition that the hot pressing temperature is 450 ℃; the rolling pressure is 900t, and the rolling speed is 16 m/min;
s5, carrying out recrystallization annealing on the material subjected to the S4; the temperature of recrystallization annealing is 480 ℃, and the heat preservation time is 8 hours;
s6, coiling, slitting and finishing the material obtained in the step S5 to obtain an aluminum plate strip; and the coiling temperature was controlled at 590 ℃.
Example 5:
the embodiment provides a high-strength aluminum plate strip, which comprises an aluminum strip and a steel strip which are prepared by composite hot pressing, wherein the mass ratio of the aluminum strip to the steel strip is 4: 1;
in a preferred embodiment, the aluminum strip comprises the following chemical components in percentage by mass: si: 0.11%, Fe: 0.07%, Cu: 022%, Mn: 0.41%, Mg: 4.3%, Cr: 0.006%, Ti: 0.02%, Zn: 0.31%, La: 0.002%, Ce 0.0012%; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
In a preferred embodiment, the steel strip comprises the following chemical components in percentage by mass: si: 0.03%, Mn: 0.6%, Ti 0.042%, C: 0.041%, P: 0.004%, S: 0.006%, Nb: 0.023%, B: 0.0006% and the balance of Fe and inevitable impurities;
in addition, in a preferred embodiment, a method for producing a high-strength aluminum plate strip is also provided, and the method comprises the following steps:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then performing semi-continuous casting at 720 ℃ to obtain an aluminum alloy ingot, and then insulating the aluminum alloy ingot at 600 ℃ to prepare a plate; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
the temperature in the smelting furnace is 720 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy liquid at a stirring speed of 8200r/min until the molten aluminum alloy liquid is melted, and adjusting the stirring conditions when the molten aluminum alloy liquid is ready to be introduced into a launder as follows: stirring at 600 r/min;
the rolling deformation of the first hot rolling is 65%, the temperature is 270 ℃, and a material with the thickness of 30mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 30% after the material is cooled to the room temperature at the cooling speed of 16 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 45%, the temperature is controlled to be 340 ℃, and a material with the thickness of 20mm is obtained after the second hot rolling; and after the second hot rolling is finished, the cooling speed is controlled to be 17 ℃/s, and the rolling speed is controlled to be 17 m/s.
The annealing treatment comprises the following steps: heating the material subjected to the second cold rolling to 370 ℃, and preserving heat for 6 hours under the temperature condition;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from a heating furnace until the temperature of the plate is 1020 ℃, controlling the reduction rate to be 15-55%, and rolling the plate within 30s at the temperature of 1020 ℃ to obtain the steel strip; in detail, the smelting is carried out in a smelting furnace, the smelting temperature is 1500 ℃, and then molten steel in the smelting furnace is discharged out of the furnace and cast into a blank;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip; the width of the at least one caulking groove is larger than that of the aluminum strip; in the preferred embodiment, the surface activation treatment of the steel strip is: placing the steel belt at the temperature of 620 ℃ and preserving heat for 4 hours;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 60% under the condition that the hot pressing temperature is 450 ℃; the rolling pressure is 1100t, and the rolling speed is 16 m/min;
s5, carrying out recrystallization annealing on the material subjected to the S4; the temperature of recrystallization annealing is 480 ℃, and the heat preservation time is 8 hours;
s6, coiling, slitting and finishing the material obtained in the step S5 to obtain an aluminum plate strip; and the coiling temperature was controlled at 600 ℃.
Comparative example 1:
the difference from example 5 is only that the mass ratio of the aluminium strip to the steel strip is 15: 1.
comparative example 2:
the difference from example 5 is only that in the process of preparing the aluminum strip, the hot rolling is performed only once, and the cold rolling is not required.
Comparative example 3:
the difference from example 5 is only that in the process of preparing the aluminum strip, the cold rolling is performed only once, and the hot rolling is not performed.
Comparative example 4:
the difference from the example 5 is that the aluminum strip and the steel strip are directly bonded without caulking grooves on the steel strip, and then the rolling and the compounding are carried out by adopting a rolling mill.
The first test example: performance testing
The aluminum plate strips prepared in examples 1 to 5 and comparative examples 1 to 4 were tested, and the test results are shown in table 1.
Table 1: performance testing
(remarks: A-excellent, B-good, C-medium, D-poor divisions)
As can be seen from Table 1, the influence of the microstructure and the mechanical property of the prepared aluminum plate strip is researched by performing X-ray diffraction phase analysis/SEM back scattering scanning and energy spectrum analysis on the aluminum plate strip and a transmission electron microscope analysis technology and a metallographic test technology, the tensile strength Rm of the prepared aluminum plate strip is more than or equal to 460MPa, the yield strength Rp0.2 is more than or equal to 390MPa, the elongation is more than or equal to 10 percent, and the aluminum plate strip is A in strength, wear resistance and toughness as a whole, namely has excellent comprehensive properties; the aluminum strips prepared in comparative examples 1 to 4 have poorer comprehensive properties than those prepared in the examples.
Test example two:
the aluminum plate strip prepared in example 5 was compared with comparative example 1 singly, and the production cost was estimated, and the results are shown in table 2.
Table 2: production cost
Group of Cost of
Example 5 Is low in
Comparative example 1 Height of
As can be seen from table 2, the comparison here is a single comparison, that is, the aluminum sheet strip prepared in example 5 and the aluminum sheet strip prepared in comparative example 1 are subjected to a production cost calculation, prepared according to the weight ratio of the aluminum sheet strip to the steel sheet strip in comparative example 1, and the production cost is higher than the compounding ratio in example 5, and analyzed in conjunction with table 1, the abrasion resistance and toughness of the aluminum sheet strip prepared in comparative example 1 are inferior to those of the aluminum sheet strip prepared in example 5. Therefore, the production of the invention has great economic benefit.
Test example three: comparison of mechanical Properties
The aluminum plate strip prepared in example 5 and the aluminum plate strips prepared in comparative examples 1 to 4 were subjected to mechanical property tests, and the results are shown in table 3.
Table 3: mechanical properties
It can be known from the aluminum plate strip prepared in table 3 that the tensile strength of the aluminum plate strip prepared by the invention can reach 470MPa, the yield strength can reach 390MPa, the elongation after fracture can reach 15%, the aluminum plate strip has relatively excellent comprehensive performance on the whole, and meets the schematic requirements of the market, the mechanical properties of the aluminum plate strip prepared in comparative examples 1-4 are generally poorer than those of the aluminum plate strip prepared in example 5, and the aluminum plate strip is separately compared with the aluminum plate strip prepared in comparative examples 1-4, and the caulking groove is formed in the width direction of the steel strip and then the rolling compounding is performed, so that the mechanical properties of the aluminum plate strip can be improved.
In addition, comparing the aluminum plate strips prepared in examples 1 to 5 with commercially available aluminum plate strips, the aluminum plate strips prepared by the invention have the advantage of light weight on the premise of ensuring the service performance.
In summary, the aluminum strip prepared by the invention can improve the strength by compositely rolling the aluminum strip and the steel strip, and has the advantages of light weight and long service life.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (10)

1. The high-strength aluminum plate strip is characterized by comprising an aluminum strip and a steel strip which are prepared by composite hot pressing, wherein the mass ratio of the aluminum strip to the steel strip is 1-10: 1-2;
the aluminum strip comprises the following chemical components in percentage by mass: si: 0.01-0.11%, Fe: 0.06-0.21%, Cu: 0.15-0.24%, Mn: 0.32-0.48%, Mg: 3.5-4.6%, Cr: 0.005-0.01%, Ti: 0.01-0.03%, Zn: 0.20-0.46%, La: 0.001-0.003 percent of the total weight of the raw materials, and 0.001-0.014 percent of the total weight of the raw materials; the balance of Al and other inevitable impurities, wherein the content of the other inevitable impurities is less than or equal to 0.05 percent in single part and less than or equal to 0.15 percent in total.
2. The high-strength aluminum strip of claim 1, wherein the steel strip comprises the following chemical components in percentage by mass: si: 0.01-0.10%, Mn: 0.5-0.7%, Ti 0.02-0.11%, C: 0.01-0.09%, P: 0.001-0.01%, S0.001-0.01%, Nb: 0.01-0.035%, B: 0.0002-0.001%, the balance being Fe and unavoidable impurities.
3. A method of producing a high strength aluminium strip according to claim 1 or claim 2, wherein the method includes the steps of:
s1, batching according to chemical composition of an aluminum strip, putting an aluminum ingot into a smelting furnace for melting, sequentially adding the batching of the rest components, and melting into aluminum alloy liquid under a certain stirring condition; introducing the aluminum alloy liquid into a launder for degassing, then performing semi-continuous casting at the temperature of 700-; sequentially carrying out the treatment processes of primary hot rolling, primary cold rolling, secondary hot rolling and secondary cold rolling on the plate, annealing and cooling to room temperature to obtain the aluminum strip;
s2, proportioning according to the chemical composition of the steel strip, smelting and casting the steel strip into a blank, controlling the blank to be discharged from the heating furnace until the temperature of the plate is 1000-1100 ℃, wherein the reduction rate is 15-55%, and rolling the plate within 10-30s at the temperature of 900-1100 ℃ to obtain the steel strip;
s3, carrying out surface activation treatment on the steel strip, and simultaneously forming an embedded groove in the width direction of the steel strip;
s4, enabling the aluminum strip to penetrate through the caulking groove, enabling the aluminum strip to enter a binding machine for rolling and compounding, and enabling the deformation of the aluminum strip to be 40-75% under the condition that the hot pressing temperature is 300-500 ℃;
s5, carrying out recrystallization annealing on the material subjected to the S4;
and S6, coiling the material obtained in the step S5, slitting, and finishing to obtain the aluminum plate strip.
4. The method for producing a high-strength aluminum strip as claimed in claim 3, wherein in S1, the temperature in the smelting furnace is 680-750 ℃, and the stirring conditions are as follows: stirring the molten aluminum alloy at the stirring speed of 5000-: the stirring speed is 500-1000 r/min.
5. The method for producing a high-strength aluminum plate strip as claimed in claim 3, wherein the rolling deformation of the first hot rolling is 45-90% at a temperature of 250 ℃ and 300 ℃, and a material with a thickness of 25-30mm is obtained after the first hot rolling; the first cold rolling is to control the reduction rate of the first cold rolling to be 10-55% after the material is cooled to the room temperature at the cooling speed of 15-20 ℃/min after the first hot rolling is finished; after the first cold rolling is finished, the second hot rolling is carried out, the rolling deformation of the second hot rolling is controlled to be 20-90%, the temperature is controlled to be 310-; and after the second hot rolling is finished, the cooling speed is controlled to be 15-20 ℃/s, and the rolling speed is controlled to be 15-18 m/s.
6. The production method of the high-strength aluminum strip as claimed in claim 3, wherein the annealing treatment is: and heating the material subjected to the second cold rolling to 350-380 ℃, and preserving heat for 5-8h under the temperature condition.
7. The method of claim 3, wherein at least one of the caulking grooves has a width greater than that of the aluminum strip in S3.
8. The method for producing a high-strength aluminum strip as claimed in claim 3, wherein in S4, the rolling pressure is 900-.
9. The method for producing a high-strength aluminum strip as claimed in claim 3, wherein in S5, the temperature of the recrystallization annealing is 450-490 ℃, and the holding time is 7-9 h.
10. The method for producing a high-strength aluminum strip as claimed in claim 3, wherein in S6, the coiling temperature is controlled at 550 ℃ and 610 ℃.
CN202010731661.7A 2020-07-27 2020-07-27 High-strength aluminum plate strip and production method thereof Pending CN111850362A (en)

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