A method for high yield ratio aluminum alloy rod continuous casting and rolling

Abstract

The application provides a high yield strength ratio aluminum alloy rod continuous casting and rolling method, and belongs to the field of alloy material preparation.The high yield strength ratio aluminum alloy rod continuous casting and rolling method provided by the application comprises the following steps: continuously casting the melt of an aluminum alloy, and then continuously rolling to obtain a high yield strength ratio aluminum alloy rod; the continuous casting is wheel type continuous casting; and the continuous rolling is rough rolling and finish rolling which are sequentially performed.The application realizes continuous and unbroken casting by regulating the flow and water pressure of the cooling water in each region; and the continuous rolling can obtain a continuous aluminum alloy rod and make the aluminum alloy rod have a high yield strength ratio.The aluminum alloy rod prepared by the method provided by the application has a tensile strength of 290-310 MPa, a yield strength of 200-240 MPa, an elongation of greater than or equal to 14%, a yield strength ratio greater than 80%, and can reach 10000 m without breaking, and has a high yield strength ratio and excellent continuity.

Description

Technical Field

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

[0002] With the continuous advancement of automotive lightweighting, aluminum alloy materials have been widely used in the automotive manufacturing field. Among them, aluminum alloys with high yield strength ratio are a hot research topic in the field of aluminum alloy processing both domestically and internationally.

[0003] Currently, the general production process for aluminum alloy rods in China involves: alloy smelting and formulation – vertical casting of aluminum alloy round ingots – homogenization heat treatment – ​​extrusion of the round ingots into rods. However, this production process has the following shortcomings: the production process is relatively complex, the production cycle is long, homogenization heat treatment requires a large amount of energy consumption, resulting in high costs; the produced aluminum alloy rods have poor continuity, with each rod not exceeding 100m in length; and due to the uneven microstructure at the edges and center of the round ingot, the extruded aluminum alloy rods exhibit poor performance uniformity. Summary of the Invention

[0004] The purpose of this invention is to provide a method for continuous casting and rolling of aluminum alloy rods with a high yield strength ratio. The method provided by this invention can produce aluminum alloy rods with a high yield strength ratio, and the continuity of the aluminum alloy rods can reach 10,000 m.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a method for continuous casting and rolling of aluminum alloy bars with high yield strength ratio, comprising:

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

[0008] The cooling method for the crystallizer during continuous casting is cooling water spraying; the area of ​​cooling water spraying includes the outer side of the steel strip 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 spray 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 divided into 4 equal areas along the length direction, and the first three areas along the flow direction of the melt are outer zone 1, outer zone 2 and outer zone 3 respectively.

[0010] The flow rate of the cooling water sprayed in the outermost zone 1 is 40-50 L / min; the flow rate of the cooling water sprayed in the outermost zone 2 is 30-40 L / min; and the flow rate of the cooling water in the outermost 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 comprises a side 1 area and a side 2 area; the arc surface of the crystallization wheel on both sides corresponding to each 90° round corner from the melt entering position is taken as a side area, and the side 1 area and the side 2 area are sequentially arranged along the melt flow direction;

[0012] The flow rate of the cooling water sprayed in the side 1 area is 40-50 L / min; the flow rate of the cooling water sprayed in the side 2 area is 40-50 L / min;

[0013] The cooling water spraying area of the inner circumferential wall of the wheel body of the crystallization wheel comprises an inner side 1 area, an inner side 2 area and an inner side 3 area; the arc surface area of the inner circumferential wall of the wheel body of the crystallization wheel corresponding to each 45° round corner from the melt entering position is taken as an inner side area, and the inner side 1 area, the inner side 2 area and the inner side 3 area are sequentially arranged along the melt flow direction;

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

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

[0016] The flow rate of the cooling water sprayed in the side 1 area is 45 L / min; the flow rate of the cooling water sprayed in the side 2 area is 45 L / min;

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

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

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

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

[0021] Preferably, the exit temperature of the continuous casting is 420-430 ℃.

[0022] Preferably, the pass number of the rough rolling is 3-5 times, and the total deformation amount of the rough rolling is 60-70%.

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

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

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

[0026] The application provides a high-ductility-to-strength ratio aluminum alloy rod continuous casting and rolling method, comprising: continuously casting a melt of an aluminum alloy, then continuously rolling to obtain a high-ductility-to-strength ratio aluminum alloy rod; the continuous casting is wheel-type continuous casting; the continuous rolling is rough rolling and finish rolling in sequence; the cooling mode of the crystallizer during the continuous casting is water spraying; the water spraying area includes the outer side of the steel belt of the crystallizing tank, the arc surface of the crystallizing wheel on both sides of the crystallizing tank, and the inner wall of the wheel body of the crystallizing wheel; the water spraying area of the outer side of the steel belt of the crystallizing tank includes an outer side 1 area, an outer side 2 area and an outer side 3 area; the outer side of the steel belt of the crystallizing tank is equally divided into four areas along the length direction, and the first three areas along the melt flow direction are the outer side 1 area, the outer side 2 area and the outer side 3 area respectively; the flow of the water sprayed in the outer side 1 area is 40-50 L / min; the flow of the water sprayed in the outer side 2 area is 30-40 L / min; the flow of the water in the outer side 3 area is 20-30 L / min; the water spraying area of the arc surface of the crystallizing wheel on both sides of the crystallizing tank includes a two-side 1 area and a two-side 2 area; the arc surface of the crystallizing wheel on both sides is divided into two-side areas according to every 90° circular corner from the melt entering position, and the two-side 1 area and the two-side 2 area are in sequence along the melt flow direction; the flow of the water sprayed in the two-side 1 area is 40-50 L / min; the flow of the water sprayed in the two-side 2 area is 40-50 L / min; the water spraying area of the inner wall of the wheel body of the crystallizing wheel includes an inner side 1 area, an inner side 2 area and an inner side 3 area; the inner wall of the wheel body of the crystallizing wheel is divided into inner side areas according to every 45° circular corner from the melt entering position, and the inner side 1 area, the inner side 2 area and the inner side 3 area are in sequence along the melt flow direction; the flow of the water sprayed in the inner side 1 area is 50-60 L / min; the flow of the water sprayed in the inner side 2 area is 40-50 L / min; the flow of the water sprayed in the inner side 3 area is 30-40 L / min. The application realizes continuous casting without breakage by continuously casting through the crystallizing wheel, distributing the cooling water in the crystallizer in different areas, and regulating the flow of the cooling water in each area to control the billet cooling intensity, the billet temperature and the crystalline organization density. The continuous rolling after the continuous casting can obtain a continuous aluminum alloy rod, and the aluminum alloy rod has a high ductility-to-strength ratio. The results of the examples show that the tensile strength of the as-cast and rolled aluminum alloy rod prepared by the method is 290-310 MPa, the yield strength is 200-240 MPa, the elongation is greater than or equal to 14%, the ductility-to-strength ratio is greater than 80%, the aluminum alloy rod can be continuously used for 10000 m without breaking, has a high ductility-to-strength ratio and excellent continuity. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The flow chart of the high-ductility-to-strength ratio aluminum alloy rod continuous casting and rolling method in the examples of the application. DETAILED DESCRIPTION

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

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

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

[0031] In the embodiment of the application, the components of the 6056 aluminum alloy are as follows in percentage by mass: 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 of Al.

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

[0033] In the application, the continuous casting is wheel type continuous casting.

[0034] As an embodiment of the application, the melt of the aluminum alloy can be introduced into the crystallizer tank of the wheel type continuous casting through an intermediate ladle.

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

[0036] In the application, the water spraying area of the outer side of the steel belt of the crystallizer tank includes an outer side 1 area, an outer side 2 area, and an outer side 3 area; the outer side of the steel belt of the crystallizer tank is equally divided into four areas along the length direction, and the first three areas along the flow direction of the melt are the outer side 1 area, the outer side 2 area, and the outer side 3 area respectively.

[0037] As an embodiment of the application, the flow of the water sprayed in the outer side 1 area can be 40-50 L / min, and can also be 55 L / min; the flow of the water sprayed in the outer side 2 area can be 30-40 L / min, and can also be 35 L / min; the flow of the water sprayed in the outer side 3 area can be 20-30 L / min, and can also be 25 L / min. The application sets the water spraying area of the outer side of the steel belt of the crystallizer tank and the flow of the water sprayed in each area to the above range, which is more beneficial to the cooling of the alloy melt and the casting.

[0038] In the present application, the cooling water spraying area of the arc surface of the crystallization wheel on both sides of the crystallization tank comprises two-side 1 area and two-side 2 area; the arc surface of the crystallization wheel on both sides corresponding to each 90° round corner from the melt entering position is taken as a two-side area, and the two-side 1 area and the two-side 2 area are sequentially arranged along the melt flow direction.

[0039] As an embodiment of the present application, the flow of the cooling water sprayed in the two-side 1 area can be 40-50 L / min, and can also be 45 L / min; the flow of the cooling water sprayed in the two-side 2 area can be 40-50 L / min, and can also be 45 L / min. The present application sets the cooling water spraying area of the arc surface of the crystallization wheel on both sides of the crystallization tank and the flow of the cooling water sprayed in each area to the above range, which can be more beneficial to the cooling of the alloy melt and the casting.

[0040] In the present application, the cooling water spraying area of the inner circumferential wall of the wheel body of the crystallization wheel comprises inner-side 1 area, inner-side 2 area and inner-side 3 area; the arc area of the inner circumferential wall of the wheel body of the crystallization wheel corresponding to each 45° round corner from the melt entering position is taken as an inner-side area, and the inner-side 1 area, the inner-side 2 area and the inner-side 3 area are sequentially arranged along the melt flow direction.

[0041] As an embodiment of the present application, the flow of the cooling water sprayed in the inner-side 1 area can be 50-60 L / min, and can also be 55 L / min; the flow of the cooling water sprayed in the inner-side 2 area can be 40-50 L / min, and can also be 45 L / min; the flow of the cooling water sprayed in the inner-side 3 area can be 30-40 L / min, and can also be 35 L / min. The present application sets the cooling water spraying area of the inner circumferential wall of the wheel body of the crystallization wheel and the flow of the cooling water sprayed in each area to the above range, which can be more beneficial to the cooling of the alloy melt and the casting.

[0042] The present application sets the above-mentioned area distribution of the cooling water in the crystallizer and limits the flow of the cooling water in each area to the above-mentioned range, which can ensure sufficient cooling of the alloy liquid during continuous casting, ensure the compactness of the crystallization structure of the aluminum alloy rod, realize continuous casting of the casting blank without fracture, and make the aluminum alloy rod have a high yield ratio.

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

[0044] In the present application, the temperature of the continuously cast billet is preferably 420-430℃, more preferably 420-425℃. The present application limits the temperature of the continuously cast billet to the above range, which can make the aluminum alloy have good structure and structure density during the continuous casting process, realize continuous and unbroken casting of the billet, and make the aluminum alloy rod have high yield strength ratio.

[0045] After the continuous casting of the billet, the present application preferably does not cool the billet and directly continuously rolls the billet to obtain an aluminum alloy rod with high yield strength ratio.

[0046] In the present application, the temperature of the soaking stage in the continuous rolling is preferably 490-510℃, more preferably 490-500℃. The present application limits the temperature of the soaking stage to the above range, which can make the billet reach the rolling temperature and facilitate the rolling.

[0047] In the present application, the continuous rolling is rough rolling and finish rolling performed in sequence.

[0048] In the present application, the rough rolling is preferably performed on a two-roller rough rolling mill; the number of passes of the rough rolling is preferably 3-5, more preferably 4; the total deformation amount of the rough rolling is preferably 60-70%, more preferably 62-68%, and further preferably 65%; and the temperature of the first pass of the rough rolling is preferably 490-510℃, more preferably 490-500℃. The present application does not have a special limitation on the deformation amount of each pass in the rough rolling, which can make the total deformation amount of the rough rolling be 60-70%. The present application sets the rolling temperature, the number of passes, and the total deformation amount of the first pass in the rough rolling to the above range, which can realize continuous rolling of the alloy rod and make the alloy rod have high yield strength ratio.

[0049] In the present application, the finish rolling is preferably performed on a three-roller finish rolling mill; the number of passes of the finish rolling is preferably 7-9, more preferably 8; and the total deformation amount of the finish rolling is preferably 70-80%, more preferably 72-78%, and further preferably 75%. The present application does not have a special limitation on the deformation amount of each pass in the finish rolling, which can make the total deformation amount of the finish rolling be 70-80%. The present application sets the number of passes and the total deformation amount in the finish rolling to the above range, which can realize continuous rolling of the alloy rod and make the alloy rod have high yield strength ratio.

[0050] In the present application, the temperature of the emulsion used in the continuous rolling is preferably 30-50℃, more preferably 40-50℃, and further preferably 45℃; the concentration of the emulsion is preferably 12-15wt%, more preferably 12-14wt%, and further preferably 12-13wt%. The present application does not have special limitations on 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 application, 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 the rolling, and the strength of the product will also be too high; if the temperature is too high, the temperature of the rolled material cannot be effectively removed, and the material will crack and stick to the roller; if the concentration of the emulsion is too low, the amount of heat removed is small, the amount of lubrication is small, and the surface of the product is rough; if the concentration is too high, the lubrication is excessive, and the rolling process is prone to slipping. By limiting the temperature and concentration of the emulsion to the above ranges, the present application can achieve continuous rolling and make the aluminum alloy rod have a high yield ratio.

[0051] As an embodiment of the present application, the obtained aluminum alloy rod can be wound after the finish rolling. By winding the aluminum alloy rod, the present application can facilitate the storage and transportation of the aluminum alloy rod, and also can protect the aluminum alloy rod and avoid bending damage to the aluminum alloy rod.

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

[0053] The present application realizes continuous casting by using a crystallizer, and realizes continuous rolling after continuous casting, so that a continuous aluminum alloy rod can be obtained, and the aluminum alloy rod has a high yield ratio.

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

[0055] From Figure 1 it can be seen that the method for continuous casting and rolling of the high yield ratio aluminum alloy rod is to continuously cast the melt of the aluminum alloy, and then sequentially perform rough rolling and finish rolling, and finally wind the high yield ratio aluminum alloy rod.

[0056] The technical solutions in the present application will be clearly and completely described below with reference to the embodiments in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0057] Embodiment 1 ​

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

[0059] Molten 6056 aluminum alloy (740℃) was introduced into a wheel-type continuous casting crystallizer through an intermediate ladle for continuous casting (the casting speed of continuous casting was 8.1m / min, and the billet temperature was 421℃). The billet was heated to 498℃ and then subjected to 4 passes of rough rolling (the temperature of the first pass of rough rolling was 498℃, and the total deformation of rough rolling was 65%) and 8 passes of finish rolling (the total deformation of finish rolling was 75%) before being coiled to obtain a high yield strength ratio aluminum alloy rod with a diameter of 12mm.

[0060] The cooling method for the crystallizer during continuous casting is cooling water spraying; the area of ​​cooling water spraying includes the outer side of the steel strip 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 spray 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 divided into 4 equal areas along the length direction, and the first three areas along the flow direction of the melt are outer zone 1, outer zone 2 and outer zone 3 respectively.

[0062] The cooling water spray area on the arc surface of the crystallizing wheel on both sides of the crystallizing tank includes Zone 1 on both sides and Zone 2 on both sides; the arc surface on both sides of the crystallizing wheel corresponding to each 90° rounded corner from the melt entry position is taken as a two-side area, and along the melt flow direction, they are sequentially referred to as Zone 1 on both sides and Zone 2 on both sides.

[0063] The cooling water spray area of ​​the inner peripheral wall of the crystallizing wheel includes inner zone 1, inner zone 2 and inner zone 3; the arc surface area corresponding to each 45° rounded corner of the inner peripheral wall of the crystallizing wheel from the melt entry position is the inner zone, and along the melt flow direction are inner zone 1, inner zone 2 and inner zone 3 in sequence.

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

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

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

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

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

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

[0070] The flow rate of the cooling water sprayed in the outer side 3 area is 25 L / min;

[0071] The flow rate of the cooling water sprayed in the two-side 1 area is 45 L / min;

[0072] The flow rate of the cooling water sprayed in the two-side 2 area is 45 L / min;

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

[0074] The components of the 6056 aluminum alloy are as follows in terms of 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 of Al.

[0075] After the high-ductility-to-strength-ratio aluminum alloy rod obtained in Example 1 is naturally aged for 5 days, the mechanical properties of the aluminum alloy rod are tested by using an electronic universal testing machine, and the test data are shown in Table 1.

[0076] Table 1: Test data of the mechanical properties of the high-ductility-to-strength-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 only that the flow rates of the cooling water in different cooling water spraying areas of the crystallizer are different, the ejection temperature is 450℃, and the others are the same as those in Example 1.

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

[0081] The flow rate of the cooling water sprayed in the inner side 1 area is 65 L / min;

[0082] The flow rate of the cooling water sprayed in the inner side 2 area is 55 L / min;

[0083] The flow rate of the cooling water sprayed in the inner side 3 area is 45 L / min;

[0084] The flow rate of the cooling water sprayed in the outer side 1 area is 55 L / min;

[0085] The flow rate of the cooling water sprayed in the outer side 2 area is 45 L / min;

[0086] The flow rate of the cooling water sprayed in the outer side 3 area is 35 L / min;

[0087] The flow rate of the cooling water sprayed in the two-side 1 area is 55 L / min.

[0088] The flow rate of the cooling water sprayed in the two-side 2 area is 55 L / min.

[0089] After the high yield ratio aluminum alloy rod obtained in the comparative example 1 is naturally aged for 5 days, the mechanical properties of the aluminum alloy rod are tested by using an electronic universal testing machine, and the test data are shown in Table 2.

[0090] Table 2: Test data of the mechanical properties of the high yield ratio aluminum alloy rod obtained in the comparative example 1

[0091] Sample No. Tensile strength / MPa Yield strength / MPa Elongation / % Yield 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 the comparative example 2 and the example 1 is only that the flow rate of the cooling water in the different cooling water spraying areas of the crystallizer is different, the ejection temperature is 450 ℃, and the others are the same as the example 1.

[0094] The flow rate of the cooling water in the different cooling water spraying areas of the crystallizer in the comparative example 2 is as follows:

[0095] The flow rate of the cooling water sprayed in the inside 1 area is 45 L / min.

[0096] The flow rate of the cooling water sprayed in the inside 2 area is 35 L / min.

[0097] The flow rate of the cooling water sprayed in the inside 3 area is 25 L / min.

[0098] The flow rate of the cooling water sprayed in the outside 1 area is 35 L / min.

[0099] The flow rate of the cooling water sprayed in the outside 2 area is 25 L / min.

[0100] The flow rate of the cooling water sprayed in the outside 3 area is 15 L / min.

[0101] The flow rate of the cooling water sprayed in the two-side 1 area is 35 L / min.

[0102] The flow rate of the cooling water sprayed in the two-side 2 area is 35 L / min.

[0103] Since the billet obtained after continuous casting is soft, the rough rolling is cracked, and the rough rolling cannot be smoothly carried out.

[0104] From the data in Tables 1 and 2, it can be seen that the method of the present application can make the tensile strength of the cast-rolled aluminum alloy rod reach 290-310 MPa, the yield strength reach 200-240 MPa, the elongation ≥14%, the yield ratio be greater than 80%, and the aluminum alloy rod be able to reach 10000 m without cracking, and have high yield ratio and excellent continuity.

[0105] The above merely preferred embodiments of the present application, it should be noted that for those of ordinary skill in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered within the scope of the present application.

Claims

1. A method for high yield ratio aluminum alloy rod continuous casting and rolling, comprising: continuous casting of aluminum alloy melt, and then continuous rolling to obtain high yield ratio aluminum alloy rod; the continuous casting is wheel type continuous casting; the continuous rolling is rough rolling and finish rolling in sequence; the cooling mode of the crystallizer during the continuous casting is water spraying; the water spraying area includes the outer side of the steel belt of the crystallizer, the arc surface of the crystallizer wheel on both sides of the crystallizer, and the inner wall of the wheel body of the crystallizer wheel; the water spraying area of the outer side of the steel belt of the crystallizer includes outer side 1 area, outer side 2 area and outer side 3 area; the outer side of the steel belt of the crystallizer is equally divided into four areas along the length direction, and the first three areas along the melt flow direction are the outer side 1 area, the outer side 2 area and the outer side 3 area respectively; the flow rate of the water sprayed in the outer side 1 area is 40-50 L / min; the flow rate of the water sprayed in the outer side 2 area is 30-40 L / min; the flow rate of the water in the outer side 3 area is 20-30 L / min; the water spraying area of the arc surface of the crystallizer wheel on both sides of the crystallizer includes both side 1 area and both side 2 area; the arc surface of the crystallizer wheel on both sides is divided into two side areas corresponding to each 90° circular corner from the melt entering position, and the both side 1 area and the both side 2 area are in sequence along the melt flow direction; the flow rate of the water sprayed in the both side 1 area is 40-50 L / min; the flow rate of the water sprayed in the both side 2 area is 40-50 L / min; the water spraying area of the inner wall of the wheel body of the crystallizer wheel includes inner side 1 area, inner side 2 area and inner side 3 area; the inner wall of the wheel body of the crystallizer wheel is divided into inner side areas corresponding to each 45° circular corner from the melt entering position, and the inner side 1 area, the inner side 2 area and the inner side 3 area are in sequence along the melt flow direction; the flow rate of the water sprayed in the inner side 1 area is 50-60 L / min; the flow rate of the water sprayed in the inner side 2 area is 40-50 L / min; the flow rate of the water sprayed in the inner side 3 area is 30-40 L / min.

2. The method of claim 1, wherein, the flow rate of the water sprayed in the outer side 1 area is 45 L / min; the flow rate of the water sprayed in the outer side 2 area is 35 L / min; the flow rate of the water in the outer side 3 area is 25 L / min; the flow rate of the water sprayed in the both side 1 area is 45 L / min; the flow rate of the water sprayed in the both side 2 area is 45 L / min; the flow rate of the water sprayed in the inner side 1 area is 55 L / min; the flow rate of the water sprayed in the inner side 2 area is 45 L / min; the flow rate of the water sprayed in the inner side 3 area is 35 L / min.

3. The method of claim 1, wherein, the aluminum alloy is 6056 aluminum alloy.

4. The method of claim 1, wherein, the initial temperature of the melt during the continuous casting is 720-750 ℃.

5. The method of claim 1, wherein, the casting speed of the continuous casting is 6.3-8.2 m / min.

6. The method of claim 1, wherein, the out-of-billet temperature of the continuous casting is 420-430 ℃.

7. The method of claim 1, wherein, the pass number of the rough rolling is 3-5, and the total deformation of the rough rolling is 60-70%.

8. The method of claim 1, wherein, the pass number of the finish rolling is 7-9, and the total deformation of the finish rolling is 70-80%.

9. The method of claim 1, wherein, the rolling temperature of the first pass in the rough rolling is 490-510 ℃.

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