Continuous casting and rolling method for aluminum alloy rod with high yield ratio

Abstract

The invention provides a continuous casting and rolling method for a high-yield-ratio aluminum alloy rod, and belongs to the field of alloy material preparation. The continuous casting and rolling method for the high-yield-ratio aluminum alloy rod comprises the steps that aluminum alloy melt is subjected to continuous casting and then subjected to continuous rolling, and the high-yield-ratio aluminum alloy rod is obtained; the continuous casting is wheel type continuous casting; the continuous rolling comprises rough rolling and finish rolling which are sequentially carried out. By regulating and controlling the flow and water pressure of cooling water in all the areas, continuous and fracture-free casting blanks are achieved; through continuous rolling, a continuous aluminum alloy rod can be obtained, and the aluminum alloy rod has a high yield ratio. According to the cast-rolled aluminum alloy rod prepared through the method, the tensile strength ranges from 290 MPa to 310 MPa, the yield strength ranges from 200 MPa to 240 MPa, the ductility is larger than or equal to 14%, the yield ratio is larger than 80%, the aluminum alloy rod can reach 10000 m without breakage, and the high yield ratio and excellent continuity are achieved.

Description

Technical Field

[0001] The invention relates to the field of alloy material preparation, in particular to a method for continuous casting and rolling of high yield ratio aluminum alloy rods. Background Art

[0002] With the continuous advancement of automobile lightweighting, aluminum alloy materials have been widely used in the field of automobile manufacturing. Among them, aluminum alloys with high yield ratio are a hot material in the research of aluminum alloy processing at home and abroad.

[0003] At present, the production process of domestic aluminum alloy rods generally includes the following steps: alloy smelting and preparation - shaft casting of aluminum alloy round ingots - homogenization heat treatment - round ingot extrusion into rods. However, the production process of aluminum alloy rods still has the following shortcomings: the production process is relatively complicated, the production cycle is long, the homogenization heat treatment requires a lot of energy consumption and the cost is high; the continuity of the aluminum alloy rods produced is poor, and the length of each rod does not exceed 100m; due to the uneven structure of the edge and core of the round ingot, the performance uniformity of the aluminum alloy rods after extrusion is poor. Summary of the invention

[0004] The object of the present invention is to provide a method for continuous casting and rolling of high yield ratio aluminum alloy rods. The method provided by the present invention can produce aluminum alloy rods with high yield ratio, and the continuity of the aluminum alloy rods can reach 10000m.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for continuous casting and rolling of a high yield ratio aluminum alloy rod, comprising:

[0007] The aluminum alloy melt is continuously cast and then continuously rolled to obtain a high yield ratio aluminum alloy rod; the continuous casting is wheel continuous casting; the continuous rolling is rough rolling and finish rolling performed sequentially;

[0008] The cooling method of the crystallizer during continuous casting is cooling water spraying; the area where the cooling water is sprayed includes the outer side of the steel belt of the crystallization tank, the arc surface of the crystallization wheel on both sides of the crystallization tank, and the inner peripheral wall of the crystallization wheel;

[0009] The cooling water spraying area outside the steel strip of the crystallization tank includes outer zone 1, outer zone 2 and outer zone 3; the outer side of the steel strip of the crystallization tank is equally divided into 4 areas along the length direction, and the first three areas along the flow direction of the melt are respectively the outer zone 1, the outer zone 2 and the outer zone 3;

[0010] The flow rate of the spray cooling water in the outer zone 1 is 40-50 L / min; the flow rate of the spray cooling water in the outer zone 2 is 30-40 L / min; the flow rate of the cooling water in the outer zone 3 is 20-30 L / min;

[0011] The cooling water spraying area of ​​the arc surface of the crystallization wheel on both sides of the crystallization tank includes two side zones 1 and two side zones 2; the arc surface on both sides of the crystallization wheel corresponding to each 90° fillet of the melt entry position is regarded as a two side zone, and along the melt flow direction, it is sequentially divided into two side zones 1 and two side zones 2;

[0012] The flow rate of the spray cooling water in the zone 1 on both sides is 40-50 L / min; the flow rate of the spray cooling water in the zone 2 on both sides is 40-50 L / min;

[0013] The cooling water spraying area of ​​the inner peripheral wall of the crystal wheel comprises inner zone 1, inner zone 2 and inner zone 3; the inner peripheral wall of the crystal wheel body corresponding to the arc surface area of ​​every 45° fillet from the melt entry position is the inner zone, and the inner zone 1, inner zone 2 and inner zone 3 are arranged in sequence along the melt flow direction;

[0014] The flow rate of the spray cooling water in the inner zone 1 is 50-60 L / min; the flow rate of the spray cooling water in the inner zone 2 is 40-50 L / min; the flow rate of the spray cooling water in the inner zone 3 is 30-40 L / min.

[0015] Preferably, the flow rate of the spray cooling water in the outer zone 1 is 45 L / min; the flow rate of the spray cooling water in the outer zone 2 is 35 L / min; the flow rate of the cooling water in the outer zone 3 is 25 L / min;

[0016] The flow rate of the spray cooling water in the zone 1 on both sides is 45L / min; the flow rate of the spray cooling water in the zone 2 on both sides is 45L / min;

[0017] The flow rate of the spray cooling water in the inner zone 1 is 55L / min; the flow rate of the spray cooling water in the inner zone 2 is 45L / min; the flow rate of the spray cooling water in the inner zone 3 is 35L / min

[0018] Preferably, the aluminum alloy is 6056 aluminum alloy.

[0019] Preferably, the initial temperature of the melt during the continuous casting is 720-750°C.

[0020] Preferably, the casting speed of the continuous casting is 6.3-8.2 m / min.

[0021] Preferably, the billet discharge temperature of the continuous casting is 420-430°C.

[0022] Preferably, the rough rolling is performed 3 to 5 times, and the total deformation of the rough rolling is 60 to 70%.

[0023] Preferably, the number of passes of the finish rolling is 7 to 9, and the total deformation of the finish rolling is 70 to 80%.

[0024] Preferably, the rolling temperature of the first pass in the rough rolling is 490-510°C.

[0025] Preferably, the temperature of the emulsion used in the continuous rolling is 30-50° C., and the concentration of the emulsion is 12-15 wt %.

[0026] The invention provides a method for continuous casting and rolling of a high yield ratio aluminum alloy rod, comprising: continuously casting an aluminum alloy melt, and then continuously rolling to obtain a high yield ratio aluminum alloy rod; the continuous casting is wheel-type continuous casting; the continuous rolling is rough rolling and finish rolling performed in sequence; the cooling method of the crystallizer during the continuous casting is cooling water spraying; the cooling water spraying area includes the outer side of a steel strip of a crystallization tank, the arc surface of a crystallization wheel on both sides of the crystallization tank, and the inner peripheral wall of a wheel body of the crystallization wheel; the cooling water spraying area of ​​the outer side of the steel strip of the crystallization tank includes outer side zone 1, outer side zone 2 and outer side zone 3; the outer side of the steel strip of the crystallization tank is equally divided into 4 areas along the length direction, and the first three areas along the flow direction of the melt are respectively the outer side zone 1, the outer side zone 2 and the outer side zone 3; the flow rate of the cooling water sprayed in the outer side zone 1 is 40-50 L / min; the flow rate of the cooling water sprayed in the outer side zone 2 is 30-40 L / min; the flow rate of the cooling water in the outer side zone 3 is 20-30 L / min in; the cooling water spraying area of ​​the arc surface of the crystallization wheel on both sides of the crystallization tank includes two sides of the 1 zone and two sides of the 2 zone; the arc surface on both sides of the crystallization wheel corresponding to the arc surface of each 90° fillet at the melt entry position is regarded as a two-side area, and along the melt flow direction, it is the two sides of the 1 zone and the two sides of the 2 zone; the flow rate of the cooling water sprayed in the two sides of the 1 zone is 40-50L / min; the flow rate of the cooling water sprayed in the two sides of the 2 zones is 40-50L / min; the cooling water on the inner peripheral wall of the wheel body of the crystallization wheel The spraying area includes inner zone 1, inner zone 2 and inner zone 3; the inner circumferential wall of the crystal wheel body corresponding to the arc surface area of ​​every 45° fillet from the melt entry position is the inner zone, and along the melt flow direction, it is the inner zone 1, inner zone 2 and inner zone 3 in sequence; the flow rate of the cooling water sprayed in the inner zone 1 is 50-60L / min; the flow rate of the cooling water sprayed in the inner zone 2 is 40-50L / min; the flow rate of the cooling water sprayed in the inner zone 3 is 30-40L / min. The present invention performs continuous casting through a crystallization wheel, distributes the cooling water in the crystallizer in different regions, and regulates the flow rate of the cooling water in each region, so as to control the cooling intensity of the billet, the billet exit temperature and the density of the crystal structure, and realize continuous casting without fracture; by continuous rolling after continuous casting, a continuous aluminum alloy rod can be obtained, and the aluminum alloy rod has a high yield strength ratio. The results of the embodiments show that the cast-rolled aluminum alloy rod prepared by the method provided by the present invention has a tensile strength of 290-310 MPa, a yield strength of 200-240 MPa, an elongation of ≥14%, and a yield strength ratio of greater than 80% after 3-5 days of natural aging. The aluminum alloy rod can last for 10,000 m without breaking, and has a high yield strength ratio and excellent continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of the method for continuous casting and rolling of high yield ratio aluminum alloy rods in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention provides a method for continuous casting and rolling of a high yield ratio aluminum alloy rod, comprising:

[0029] The aluminum alloy melt is continuously cast and then continuously rolled to obtain an aluminum alloy rod with a high yield strength ratio.

[0030] In the present invention, the aluminum alloy is preferably 6056 aluminum alloy.

[0031] In an embodiment of the present invention, the composition of the 6056 aluminum alloy is as follows by mass percentage: Si 1.12%, Fe 0.13%, Cu 0.84%, Mn 0.60%, Mg 0.92%, Cr 0.04%, Zn 0.24%, Ti 0.04%, Sr 0.001%, B 0.003%, Zr 0.13%, RE 0.12% and the balance Al.

[0032] In the present invention, the initial temperature of the melt during continuous casting is preferably 720-750° C., more preferably 730-740° C. The present invention limits the initial temperature of the melt during continuous casting to the above range, which is beneficial to the flow of the alloy liquid and further facilitates the subsequent continuous casting.

[0033] In the present invention, the continuous casting is wheel-type continuous casting.

[0034] As an embodiment of the present invention, the aluminum alloy melt may be introduced into the crystallization tank of the wheel-type continuous casting through a tundish.

[0035] In the present invention, the cooling method of the crystallizer during continuous casting is cooling water spraying; the cooling water spraying area includes the outer side of the steel belt of the crystallization tank, the arc surface of the crystallization wheel on both sides of the crystallization tank, and the inner peripheral wall of the wheel body of the crystallization wheel.

[0036] In the present invention, the cooling water spraying area outside the steel strip of the crystallization tank includes outer zone 1, outer zone 2 and outer zone 3; the outer side of the steel strip of the crystallization tank is equally divided into 4 zones along the length direction, and the first three zones along the flow direction of the melt are outer zone 1, outer zone 2 and outer zone 3 respectively.

[0037] As an embodiment of the present invention, the flow rate of the spray cooling water in the outer zone 1 can be 40-50 L / min, or 55 L / min; the flow rate of the spray cooling water in the outer zone 2 can be 30-40 L / min, or 35 L / min; the flow rate of the spray cooling water in the outer zone 3 can be 20-30 L / min, or 25 L / min. The present invention sets the cooling water spray area outside the steel strip of the crystallization tank and the flow rate of the spray cooling water in each area to the above range, which can be more conducive to the cooling and casting of the alloy melt.

[0038] In the present invention, the cooling water spraying area of ​​the arc surface of the crystallization wheel on both sides of the crystallization tank includes two side zones 1 and two side zones 2; the arc surface on both sides of the crystallization wheel corresponding to each 90° fillet of the melt entry position is regarded as a two side zone, and along the melt flow direction, it is sequentially divided into two side zones 1 and two side zones 2.

[0039] As an embodiment of the present invention, the flow rate of the cooling water sprayed in the first zone on both sides can be 40-50 L / min, or 45 L / min; the flow rate of the cooling water sprayed in the second zone on both sides can be 40-50 L / min, or 45 L / min. The present invention sets the cooling water spraying area of ​​the crystallization wheel arc surface on both sides of the crystallization tank and the flow rate of the cooling water sprayed in each zone to the above range, which is more conducive to the cooling and casting of the alloy melt.

[0040] In the present invention, the cooling water spraying area of ​​the inner peripheral wall of the crystallization wheel includes inner zone 1, inner zone 2 and inner zone 3; the arc surface area corresponding to every 45° fillet of the inner peripheral wall of the crystallization wheel body from the melt entry position is the inner zone, and along the melt flow direction are the inner zone 1, inner zone 2 and inner zone 3 in sequence.

[0041] As an embodiment of the present invention, the flow rate of the spray cooling water in the inner zone 1 can be 50-60 L / min, or 55 L / min; the flow rate of the spray cooling water in the inner zone 2 can be 40-50 L / min, or 45 L / min; the flow rate of the spray cooling water in the inner zone 3 can be 30-40 L / min, or 35 L / min. The present invention sets the cooling water spray area of ​​the inner peripheral wall of the wheel body of the crystallization wheel and the flow rate of the spray cooling water in each area to the above range, which can be more conducive to the cooling and casting of the alloy melt.

[0042] The present invention distributes the cooling water in the crystallizer in the above-mentioned areas and limits the cooling water flow in each area to the above-mentioned range, which can ensure sufficient cooling of the alloy liquid during the continuous casting process, ensure the density of the crystalline structure of the aluminum alloy rod, achieve continuous casting without breakage, and make the aluminum alloy rod have a high yield strength ratio.

[0043] In the present invention, the casting speed of the continuous casting is preferably 6.3 to 8.2 m / min, more preferably 7 to 8.1 m / min, and further preferably 7.8 to 8.1 m / min. The present invention limits the casting speed of the continuous casting to the above range to improve the continuity of the aluminum alloy rod.

[0044] In the present invention, the billet discharge temperature of the continuous casting is preferably 420-430° C., more preferably 420-425° C. The present invention limits the billet discharge temperature of the continuous casting to the above range, so that the aluminum alloy can have a good organizational structure and organizational density during the continuous casting process, achieve continuous casting without fracture, and make the aluminum alloy rod have a high yield strength ratio.

[0045] After the continuous casting, the present invention preferably directly performs continuous rolling on the cast billet without cooling it to obtain a high yield ratio aluminum alloy rod.

[0046] In the present invention, the temperature of the soaking stage in the continuous rolling is preferably 490-510° C., more preferably 490-500° C. The present invention limits the temperature of the soaking stage to the above range so that the cast billet can reach the rolling temperature, which is convenient for rolling.

[0047] In the present invention, the continuous rolling is rough rolling and finish rolling performed sequentially.

[0048] In the present invention, the rough rolling is preferably carried out in a two-roll rough rolling mill; the number of passes of the rough rolling is preferably 3 to 5, more preferably 4; the total deformation of the rough rolling is preferably 60 to 70%, more preferably 62 to 68%, and further preferably 65%; the temperature of the first pass of the rough rolling is preferably 490 to 510°C, more preferably 490 to 500°C. The present invention does not specifically limit the deformation of each pass in the rough rolling, as long as the total deformation of the rough rolling is 60 to 70%. The present invention sets the rolling temperature, number of passes and total deformation of the first pass in the rough rolling to the above ranges to achieve continuous rolling of the alloy rod and make the alloy rod have a high yield strength ratio.

[0049] In the present invention, the finishing rolling is preferably carried out in a three-roll finishing mill; the number of passes of the finishing rolling is preferably 7 to 9 times, more preferably 8 times; the total deformation of the finishing rolling is preferably 70 to 80%, more preferably 72 to 78%, and further preferably 75%. The present invention does not specifically limit the deformation of each pass in the finishing rolling, as long as the total deformation of the finishing rolling is 70 to 80%. The present invention sets the number of passes and the total deformation in the finishing rolling to the above ranges to achieve continuous rolling of the alloy rod and make the alloy rod have a high yield strength ratio.

[0050] In the present invention, the temperature of the emulsion used in the continuous rolling is preferably 30-50°C, more preferably 40-50°C, and further preferably 45°C; the concentration of the emulsion is preferably 12-15wt%, more preferably 12-14wt%, and further preferably 12-13wt%. The present invention does not specifically limit the type of emulsion used in the continuous rolling, and the type of emulsion commonly used by those skilled in the art can be used. In the present invention, if the temperature of the emulsion is too low, the hardness of the rolled material will increase, which is not conducive to the smoothness of rolling, and the product strength will be too high; if the temperature is too high, the temperature of the rolled material cannot be effectively taken away, and the material will crack and have the risk of sticking to the roller; if the concentration of the emulsion is too low, less heat is taken away, less lubrication, and the product surface is rough; if the concentration is too high, excessive lubrication, and the rolling process is easy to slip. The present invention limits the temperature and concentration of the emulsion to the above range to achieve continuous rolling and make the aluminum alloy rod have a high yield strength ratio.

[0051] As an embodiment of the present invention, the obtained aluminum alloy rod can be coiled after the finish rolling. The present invention can facilitate the storage and transportation of the aluminum alloy rod by coiling the aluminum alloy rod, and can also protect the aluminum alloy rod and avoid bending damage to the aluminum alloy rod.

[0052] In the embodiment of the present invention, the diameter of the obtained aluminum alloy rod is 12 mm.

[0053] The present invention performs continuous casting through a crystallization wheel, distributes cooling water in a crystallizer in different regions, and regulates the flow rate and water pressure of the cooling water in each region, thereby controlling the cooling intensity of the billet, the billet discharge temperature and the density of the crystal structure, and achieving continuous casting without fracture; by performing continuous rolling after continuous casting, a continuous aluminum alloy rod can be obtained, and the aluminum alloy rod has a high yield strength ratio.

[0054] In a specific embodiment of the present invention, the method flow chart of continuous casting and rolling of high yield ratio aluminum alloy rod is as follows: Figure 1 As shown:

[0055] from Figure 1 It can be seen from the figure that the method for continuous casting and rolling of the high yield ratio aluminum alloy rod is as follows: the aluminum alloy melt is continuously cast and then rough rolled and finish rolled in sequence, and finally coiled to obtain the high yield ratio aluminum alloy rod.

[0056] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] Example 1

[0058] A method for continuous casting and rolling of high yield ratio aluminum alloy rods:

[0059] The molten metal (740°C) of 6056 aluminum alloy is introduced into a wheel-type continuous casting crystallization tank through an intermediate ladle for continuous casting (the casting speed of continuous casting is 8.1 m / min, and the billet discharge temperature is 421°C). The billet discharged is heated to 498°C and then subjected to four rough rollings (the first rolling temperature in the rough rolling is 498°C, and the total deformation of the rough rolling is 65%) and eight finishing rollings (the total deformation of the finishing rolling is 75%), and then coiled to obtain a high yield ratio aluminum alloy rod with a diameter of 12 mm;

[0060] The cooling method of the crystallizer during continuous casting is cooling water spraying; the area where the cooling water is sprayed includes the outer side of the steel belt of the crystallization tank, the arc surface of the crystallization wheel on both sides of the crystallization tank, and the inner peripheral wall of the crystallization wheel;

[0061] The cooling water spraying area outside the steel strip of the crystallization tank includes outer zone 1, outer zone 2 and outer zone 3; the outer side of the steel strip of the crystallization tank is equally divided into 4 areas along the length direction, and the first three areas along the flow direction of the melt are respectively the outer zone 1, the outer zone 2 and the outer zone 3;

[0062] The cooling water spraying area of ​​the arc surface of the crystallization wheel on both sides of the crystallization tank includes two side zones 1 and two side zones 2; the arc surface on both sides of the crystallization wheel corresponding to each 90° fillet of the melt entry position is regarded as a two side zone, and along the melt flow direction, it is sequentially divided into two side zones 1 and two side zones 2;

[0063] The cooling water spraying area of ​​the inner peripheral wall of the crystal wheel comprises inner zone 1, inner zone 2 and inner zone 3; the inner peripheral wall of the crystal wheel body corresponding to the arc surface area of ​​every 45° fillet from the melt entry position is the inner zone, and the inner zone 1, inner zone 2 and inner zone 3 are arranged in sequence along the melt flow direction;

[0064] The temperature of the cooling water is 32°C;

[0065] The flow rate of the spray cooling water in the inner zone 1 is 55L / min;

[0066] The flow rate of the inner 2 zone spray cooling water is 45L / min;

[0067] The flow rate of the inner 3 zone spray cooling water is 35L / min;

[0068] The flow rate of the spray cooling water in the outer zone 1 is 45L / min;

[0069] The flow rate of the spray cooling water in the outer zone 2 is 35L / min;

[0070] The flow rate of the outer 3 zones spray cooling water is 25L / min;

[0071] The flow rate of the spray cooling water in zone 1 on both sides is 45L / min;

[0072] The flow rate of the two zones of spray cooling water on both sides is 45L / min;

[0073] The temperature of the emulsion used in the continuous rolling is 45°C; the concentration of the emulsion is 12wt%;

[0074] The components of the 6056 aluminum alloy are as follows by mass percentage: Si 1.12%, Fe 0.13%, Cu 0.84%, Mn 0.60%, Mg 0.92%, Cr 0.04%, Zn 0.24%, Ti 0.04%, Sr 0.001%, B 0.003%, Zr 0.13%, RE 0.12% and the balance Al.

[0075] After the high yield strength ratio aluminum alloy rod obtained in Example 1 was naturally aged for 5 days, the mechanical properties of the aluminum alloy rod were tested using an electronic universal testing machine. The test data are shown in Table 1.

[0076] Table 1 Mechanical properties test data of high yield ratio aluminum alloy rod obtained in Example 1

[0077] Sample No. Tensile strength / MPa Yield strength / MPa Elongation / % Yield ratio / % 1 301 248 14.8 82 2 301 249 15.2 83 3 297 242 14.8 81 4 295 242 14.2 82

[0078] Comparative Example 1

[0079] The difference between Comparative Example 1 and Example 1 is that the cooling water flow rates in different cooling water spraying areas of the crystallizer are different, the billet discharge temperature is 450° C., and the rest is the same as Example 1;

[0080] The cooling water flow rates in different cooling water spraying areas of the crystallizer in Comparative Example 1 are as follows:

[0081] The flow rate of spray cooling water in inner zone 1 is 65L / min;

[0082] The flow rate of spray cooling water in the inner 2 zone is 55L / min;

[0083] The flow rate of the spray cooling water in the inner 3 zones is 45L / min;

[0084] The flow rate of spray cooling water in outer zone 1 is 55L / min;

[0085] The flow rate of spray cooling water in the outer 2 zones is 45L / min;

[0086] The flow rate of the spray cooling water in the outer 3 zones is 35L / min;

[0087] The flow rate of spray cooling water in zone 1 on both sides is 55L / min;

[0088] The flow rate of spray cooling water in zone 2 on both sides is 55L / min.

[0089] After the high yield strength ratio aluminum alloy rod obtained in Comparative Example 1 was naturally aged for 5 days, the mechanical properties of the aluminum alloy rod were tested using an electronic universal testing machine. The test data are shown in Table 2.

[0090] Table 2 Mechanical properties test data of high yield strength ratio aluminum alloy rod obtained in comparative example 1

[0091] Sample No. Tensile strength / MPa Yield strength / MPa Elongation / % Yield strength ratio / % 1 330 255 9.8 77 2 328 252 10.2 77 3 326 246 10.5 75 4 331 249 10 75

[0092] Comparative Example 2

[0093] The difference between Comparative Example 2 and Example 1 is that the flow rate of cooling water in different cooling water spraying areas of the crystallizer is different, the billet discharge temperature is 450° C., and the rest is the same as Example 1;

[0094] The flow rates of cooling water in different cooling water spraying areas of the crystallizer in Comparative Example 2 are as follows:

[0095] The flow rate of spray cooling water in inner zone 1 is 45L / min;

[0096] The flow rate of the spray cooling water in the inner 2 zone is 35L / min;

[0097] The flow rate of the spray cooling water in the inner 3 zones is 25L / min;

[0098] The flow rate of spray cooling water in outer zone 1 is 35L / min;

[0099] The flow rate of spray cooling water in the outer 2 zones is 25L / min;

[0100] The flow rate of the spray cooling water in the outer 3 zones is 15L / min;

[0101] The flow rate of spray cooling water in zone 1 on both sides is 35L / min;

[0102] The flow rate of spray cooling water in two zones on both sides is 35L / min.

[0103] Since the billet obtained after continuous casting is relatively soft during rough rolling, it cracks during rough rolling and cannot be smoothly rough rolled.

[0104] It can be seen from the data in Table 1 and Table 2 that the method of the present invention can make the tensile strength of the cast aluminum alloy rod reach 290-310 MPa, the yield strength reach 200-240 MPa, the elongation ≥14%, the yield strength ratio greater than 80%, and the aluminum alloy rod can reach 10000m without breaking, with a high yield strength ratio and excellent continuity.

[0105] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for continuous casting and rolling of a high yield ratio aluminum alloy rod, comprising: The aluminum alloy melt is continuously cast and then continuously rolled to obtain a high yield-to-strength ratio aluminum alloy rod; The continuous casting is wheel-type continuous casting; The continuous rolling is rough rolling and finish rolling performed sequentially; The cooling method of the crystallizer during continuous casting is cooling water spraying; the area where the cooling water is sprayed includes the outer side of the steel belt of the crystallization tank, the arc surface of the crystallization wheel on both sides of the crystallization tank, and the inner peripheral wall of the crystallization wheel; The cooling water spraying area outside the steel strip of the crystallization tank includes outer zone 1, outer zone 2 and outer zone 3; the outer side of the steel strip of the crystallization tank is equally divided into 4 areas along the length direction, and the first three areas along the flow direction of the melt are respectively the outer zone 1, the outer zone 2 and the outer zone 3; The flow rate of the spray cooling water in the outer zone 1 is 40-50 L / min; the flow rate of the spray cooling water in the outer zone 2 is 30-40 L / min; the flow rate of the cooling water in the outer zone 3 is 20-30 L / min; The cooling water spraying area of ​​the arc surface of the crystallization wheel on both sides of the crystallization tank includes two side zones 1 and two side zones 2; the arc surface on both sides of the crystallization wheel corresponding to each 90° fillet of the melt entry position is regarded as a two side zone, and along the melt flow direction, it is sequentially divided into two side zones 1 and two side zones 2; The flow rate of the spray cooling water in the zone 1 on both sides is 40-50 L / min; the flow rate of the spray cooling water in the zone 2 on both sides is 40-50 L / min; The cooling water spraying area of ​​the inner peripheral wall of the crystal wheel comprises inner zone 1, inner zone 2 and inner zone 3; the inner peripheral wall of the crystal wheel body corresponding to the arc surface area of ​​every 45° fillet from the melt entry position is the inner zone, and the inner zone 1, inner zone 2 and inner zone 3 are arranged in sequence along the melt flow direction; The flow rate of the spray cooling water in the inner zone 1 is 50-60 L / min; the flow rate of the spray cooling water in the inner zone 2 is 40-50 L / min; the flow rate of the spray cooling water in the inner zone 3 is 30-40 L / min.

2. The method according to claim 1, characterized in that The flow rate of the spray cooling water in the outer zone 1 is 45L / min; the flow rate of the spray cooling water in the outer zone 2 is 35L / min; the flow rate of the cooling water in the outer zone 3 is 25L / min; The flow rate of the spray cooling water in the zone 1 on both sides is 45L / min; the flow rate of the spray cooling water in the zone 2 on both sides is 45L / min; The flow rate of the spray cooling water in the inner zone 1 is 55 L / min; the flow rate of the spray cooling water in the inner zone 2 is 45 L / min; and the flow rate of the spray cooling water in the inner zone 3 is 35 L / min.

3. The method according to claim 1, characterized in that The aluminum alloy is 6056 aluminum alloy.

4. The method according to claim 1, characterized in that: The initial temperature of the melt during the continuous casting is 720-750°C.

5. The method according to claim 1, characterized in that The casting speed of the continuous casting is 6.3-8.2 m / min.

6. The method according to claim 1, characterized in that The billet discharge temperature of the continuous casting is 420-430°C.

7. The method according to claim 1, characterized in that The number of passes of the rough rolling is 3 to 5 times, and the total deformation amount of the rough rolling is 60 to 70%.

8. The method according to claim 1, characterized in that: The number of passes of the finishing rolling is 7 to 9 times, and the total deformation amount of the finishing rolling is 70 to 80%.

9. The method according to claim 1, characterized in that: The rolling temperature of the first pass in the rough rolling is 490-510°C.

10. The method according to claim 1, characterized in that The temperature of the emulsion used in the continuous rolling is 30-50° C., and the concentration of the emulsion is 12-15 wt %.

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