CN115522106A - Online Sr modification method for aluminum alloy - Google Patents
Online Sr modification method for aluminum alloy Download PDFInfo
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- CN115522106A CN115522106A CN202211181317.0A CN202211181317A CN115522106A CN 115522106 A CN115522106 A CN 115522106A CN 202211181317 A CN202211181317 A CN 202211181317A CN 115522106 A CN115522106 A CN 115522106A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 126
- 238000002715 modification method Methods 0.000 title claims abstract description 33
- YNDGDLJDSBUSEI-UHFFFAOYSA-N aluminum strontium Chemical compound [Al].[Sr] YNDGDLJDSBUSEI-UHFFFAOYSA-N 0.000 claims abstract description 115
- 230000004048 modification Effects 0.000 claims abstract description 41
- 238000012986 modification Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 21
- 229910052712 strontium Inorganic materials 0.000 claims description 22
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000002425 crystallisation Methods 0.000 claims description 12
- 230000008025 crystallization Effects 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 230000007306 turnover Effects 0.000 claims description 2
- 239000000155 melt Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- 238000003466 welding Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 7
- 239000000956 alloy Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 14
- 238000005204 segregation Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- FWGZLZNGAVBRPW-UHFFFAOYSA-N alumane;strontium Chemical class [AlH3].[Sr] FWGZLZNGAVBRPW-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
- C22C21/04—Modified aluminium-silicon alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides an online Sr modification method of an aluminum alloy, and relates to the technical field of alloy materials. The invention provides an online Sr modification method of an aluminum alloy, which comprises the following steps: and adding an aluminum strontium rod in the flowing process of the aluminum alloy melt, and performing Sr modification treatment to obtain the target aluminum alloy. According to the invention, the aluminum strontium rod uniformly and continuously enters the melt by an online Sr modification method, and the aluminum strontium rod and the aluminum alloy melt are uniformly mixed in the melt flowing process, so that the uniformity of the target aluminum alloy component is ensured, and the modification effect is improved. Compared with the traditional in-furnace Sr ingot modification method, the on-line Sr modification method provided by the invention has the advantages that the whole-furnace Sr content uniformity is improved, the modification effect uniformity is improved, the quality of the 4043 aluminum alloy rod is stably improved, and a high-quality blank is provided for drawing and preparing a welding wire.
Description
Technical Field
The invention relates to the technical field of alloy materials, in particular to an online Sr modification method of an aluminum alloy.
Background
The 4043 aluminum alloy is a typical 4 xxx series aluminum alloy (Al-Si series), the 4043 aluminum alloy has the characteristics of low melting point, good fluidity, good corrosion resistance and the like, and the welding performance is excellent, so the 4043 aluminum alloy rod is widely used for producing welding wires. To ensure that the 4043 aluminum alloy rod is successfully drawn into a welding wire, it is generally necessary to control the mechanical properties (tensile strength, elongation after fracture, etc.), the uniformity of the components, defects, etc. of the 4043 aluminum alloy rod. Therefore, sr modification is usually required in the production process.
The traditional modification process is to add an aluminum-strontium intermediate alloy ingot into a furnace, because the metal Sr is very active and the burning loss is high, the Sr content is greatly deviated before and after the aluminum alloy rod is cast by using the method, so that the aluminum alloy rod has unstable component quality, uneven modification effect and easy defect generation, and the aluminum alloy rod is easy to break in drawing when producing welding wires.
When Sr in a traditional furnace is deteriorated, the whole-furnace secondary deviation of the actual Sr content before and after casting reaches 0.009-0.010%, the whole-furnace secondary segregation rate is 40-55%, the uniformity is poor, the actual yield is about 74-81%, and the actual yield is low.
Disclosure of Invention
The invention aims to provide an online Sr modification method for aluminum alloy, which can ensure the component uniformity of a 4043 aluminum alloy rod, improve modification effect, granulate a second phase, improve mechanical properties, reduce the problem of drawing fracture and be beneficial to manufacturing welding wires. The online Sr modification method can obviously improve the uniformity of the whole-furnace Sr content, has higher actual yield and better economic benefit.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an online Sr modification method for aluminum alloy, which comprises the following steps:
and adding an aluminum strontium rod in the flowing process of the aluminum alloy melt, and performing Sr modification treatment to obtain the target aluminum alloy.
Preferably, the aluminum strontium rod is added in a direction opposite to the flow direction of the aluminum alloy melt.
Preferably, the online adding speed of the aluminum strontium rod is as shown in formula 1:
in the formula 1, v Aluminum strontium rod Is the online adding speed of the aluminum strontium rod, and the unit is m.min -1 ；
v Melt body Is the flow rate of the aluminum alloy melt and has the unit of t.min -1 ；
C Sr Sr content in wt.% for the target aluminum alloy;
C 0 is the Sr content of the aluminum alloy melt in wt.%;
rho is the density of the aluminum strontium rod and is in t/m 3 ；
Pi is the circumference ratio;
r is the radius of the aluminum strontium rod and is in m;
c Sr strontium content in terms of wt.% of the aluminum strontium rod;
eta is the actual yield of the strontium element added into the aluminum strontium rod in the target aluminum alloy, and the unit is percent.
Preferably, the flow rate of the aluminum alloy melt is 0.09-0.11 t.min -1 。
Preferably, the strontium content of the aluminum strontium rod is 9 to 11wt.%.
Preferably, the temperature of the Sr modification treatment is 730-800 ℃.
Preferably, the online Sr modification method is carried out by adopting an aluminum alloy smelting device; the aluminum alloy smelting device comprises a tilting furnace, a launder and a crystallization wheel which are connected in sequence;
adding an aluminum strontium rod in the process that the aluminum alloy melt enters a crystallization wheel from a turning furnace through a launder;
the aluminum strontium rod is added in the runner, and the adding position of the aluminum strontium rod is 5 meters or more away from the pouring gate of the crystallization wheel.
Preferably, the aluminum alloy melt is a 4043 aluminum alloy melt.
Preferably, the target aluminum alloy is a 4043 aluminum alloy rod.
Preferably, the Sr modification treatment further includes a casting and rolling process.
The invention provides an online Sr modification method of an aluminum alloy, which comprises the following steps: and adding an aluminum strontium rod in the flowing process of the aluminum alloy melt, and performing Sr modification treatment to obtain the target aluminum alloy. According to the invention, the aluminum strontium rod uniformly and continuously enters the melt by an online Sr modification method, and the aluminum strontium rod and the aluminum alloy melt are uniformly mixed in the melt flowing process, so that the uniformity of the target aluminum alloy component is ensured, and the modification effect is improved. The results of the examples show that the online Sr modification method provided by the invention has the advantages that the deviation of the actual Sr content in the whole furnace before and after casting is 0-0.001%, the segregation rate of the whole furnace is 0-5%, the Sr content uniformity of the whole furnace is obviously improved, and the strontium content uniformity is better; the actual yield is 93.5-94.5%, and the actual yield is higher.
Compared with the traditional in-furnace Sr ingot modification method, the on-line Sr modification method provided by the invention has the advantages that the whole-furnace Sr content uniformity is improved, the modification effect uniformity is improved, the quality of the 4043 aluminum alloy rod is stably improved, and a high-quality blank is provided for drawing and preparing a welding wire.
Drawings
FIG. 1 is a schematic view of an aluminum alloy melting apparatus used in the on-line Sr modification method of the present invention.
Detailed Description
The invention provides an online Sr modification method of an aluminum alloy, which comprises the following steps:
and adding an aluminum-strontium rod in the flowing process of the aluminum alloy melt, and performing Sr modification treatment to obtain the target aluminum alloy.
In the present invention, the aluminum alloy melt is preferably a 4043 aluminum alloy melt. In the present invention, the 4043 aluminum alloy preferably has the following components in mass fraction: 4.7 to 5.5 percent of Si, 0.015 to 0.045 percent of Cu, 0.008 to 0.035 percent of Ti, less than or equal to 0.20 percent of Fe and the balance of aluminum. In the present invention, the temperature of the aluminum alloy melt is preferably 730 to 800 ℃, more preferably 750 to 790 ℃. In the present invention, the flow rate of the aluminum alloy melt is preferably 0.09 to 0.11 t.min -1 More preferably 0.1 t.min -1 。
In the present invention, the strontium content of the aluminum strontium rod is preferably 9 to 11wt.%, more preferably 10wt.%. In the present invention, the diameter of the aluminum strontium rod is preferably 9 to 10mm, and more preferably 9.5mm. The aluminum strontium rod with the composition and the diameter has the advantages of uniform components and diameters, stable flow rate guarantee and convenience in controlling melt components.
In the invention, the adding direction of the aluminum strontium rod is preferably opposite to the flowing direction of the aluminum alloy melt, so that the convection effect can be enhanced, and the melt and the aluminum strontium rod are uniformly mixed. In a specific embodiment of the invention, the adding weight of the aluminum strontium rod is 1.2 times of the theoretical adding amount of each batch production.
In the present invention, the online adding speed of the aluminum strontium rod is preferably as shown in formula 1:
in the formula 1, v Aluminum strontium rod Is the online adding speed of the aluminum strontium rod, and the unit is m.min -1 ；
v Melt body Is the flow rate of the aluminum alloy melt and has the unit of t.min -1 ；
C Sr Sr content in wt.% for the target aluminum alloy;
C 0 sr content in wt.% for the aluminium alloy melt;
rho is the density of the aluminum strontium rod and is in t/m 3 ；
Pi is the circumference ratio;
r is the radius of the aluminum strontium rod and is in m;
c Sr strontium content in terms of wt.% of the aluminum strontium rod;
eta is the actual yield of the strontium element added with the aluminum strontium rod in the target aluminum alloy, and the unit is percent.
In a specific embodiment of the present invention, when C Sr When 0.015 to 0.03wt.%, v Aluminum strontium rod Is 0.85 to 1.71m/min.
In the present invention, the temperature of the Sr modification treatment is preferably 730 to 800 ℃, and more preferably 750 to 790 ℃.
In the present invention, the online Sr modification method is preferably performed using an aluminum alloy melting apparatus; the aluminum alloy smelting device is preferably shown in figure 1 and comprises a tilting furnace, a launder and a crystallization wheel which are connected in sequence. As an embodiment of the invention, the number of the tilting furnaces is two, one tilting furnace is used for smelting, and the other tilting furnace is used for pouring the smelted aluminum alloy melt, so that continuous production is realized. In the invention, an aluminum strontium rod is added in the process that the aluminum alloy melt enters a crystallization wheel from a turnover furnace through a launder; the aluminum strontium rods are added in the launder. In the present invention, the position of the aluminum strontium rod is preferably 5m or more, more preferably 15 m or more from the nozzle of the crystallization wheel. The effect of limiting the adding position is that fluid mixing needs a period of time, at least 5 meters can be well mixed, the component uniformity is optimal when 15 meters is reached, and the component uniformity is not increased any more by increasing the length.
In the present invention, the Sr modification treatment preferably further includes a casting step. The invention has no special requirements on the specific process of the casting and rolling procedure, and the conventional casting and rolling method in the field can be adopted.
In the present invention, the target aluminum alloy is preferably a 4043 aluminum alloy rod. In the present invention, the 4043 aluminum alloy rod is preferably 9.5mm in diameter. In the present invention, the 4043 aluminum alloy rod preferably has the following composition in mass fraction: 4.7 to 5.5 percent of Si, 0.015 to 0.045 percent of Cu, 0.008 to 0.035 percent of Ti, 0.020 to 0.030 percent of Sr, less than or equal to 0.20 percent of Fe, less than or equal to 0.010 percent of Mg, less than or equal to 0.030 percent of Mn, less than or equal to 0.050 percent of Zn, and the balance of Al.
The method of the invention is adopted to carry out online Sr modification treatment on the 4043 aluminum alloy, so that the aluminum strontium rod can uniformly and continuously enter the melt, the aluminum strontium rod and the melt are uniformly mixed in the melt flowing process, the uniformity of the components of the 4043 aluminum alloy rod is ensured, the modification effect is improved, the second phase is granulated, the mechanical property is improved, the problem of drawing fracture is reduced, and the method is beneficial to manufacturing welding wires.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope 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.
Example 1
4043 the target Sr content of the aluminum alloy rod is 0.021wt.%:
1. uniform-composition stable aluminum strontium rods with 10wt.% of Sr content and 9.5mm diameter were prepared, with a weight of 1.2 times the theoretical addition per batch.
2. Preparing a wire feeder, installing an aluminum-strontium rod on the wire feeder before use, and debugging and operating.
3. After finishing other preparation work before casting and rolling, discharging 4043 aluminum alloy melt from the tilting furnace, adding an aluminum strontium rod for online modification, starting casting and rolling production, and keeping the aluminum alloy melt in the launder stably flowing without disturbing the melt in the casting and rolling process.
4. The adding mode of the aluminum strontium rod is as follows: the aluminum strontium rod is directly fed into the launder to be mixed with the aluminum alloy melt, and the adding direction of the aluminum strontium rod is opposite to the flowing direction of the aluminum alloy melt.
5. Adding position of the aluminum strontium rod: the adding position of the aluminum strontium rod is 15 meters away from the pouring gate of the crystallization wheel.
6. Adding temperature of the aluminum strontium rod: the temperature of the aluminum alloy melt in the launder was 790 ℃.
7. The formula of the online adding speed of the aluminum strontium rod is shown as the formula 1:
in the formula 1, v Aluminum strontium rod Is the online adding speed of the aluminum strontium rod, and the unit is m.min -1 ；
v Melt body Is the flow rate of the aluminum alloy melt and has the unit of t.min -1 ；
C Sr Sr content in wt.% for the target aluminum alloy;
C 0 is the Sr content of the aluminum alloy melt in wt.%;
rho is the density of the aluminum strontium rod and is t/m 3 ；
Pi is the circumference ratio;
r is the radius of the aluminum strontium rod, and the unit is m;
c Sr strontium content in wt.% for aluminum strontium rods;
eta is the actual yield of the strontium element added into the aluminum strontium rod in the target aluminum alloy, and the unit is percent.
In this example, v Melt body Is 0.102 t.min -1 ，C Sr 0.021wt.%, C 0 0wt.%, p 2.7t/m 3 Pi is 3.14, r is 0.00475m Sr Is 10wt.%, eta is 94% of the experimental value, and v is calculated Aluminum strontium rod Is 1.19m/min.
8. The components of the tail rod are detected in the early, middle and late stages, and the detection results of the components are shown in table 1.
Table 1 example 1 on-line Sr modified 4043 aluminum alloy rod composition (wt.%), balance Al
| Product-like ingredients | Si | Fe | Cu | Mg | Mn | Zn | Ti | Sr |
| 2 nd disc | 4.76 | 0.123 | 0.025 | 0.01 | 0.005 | 0.006 | 0.025 | 0.021 |
| 5 th disc | 4.7 | 0.122 | 0.025 | 0.01 | 0.005 | 0.006 | 0.027 | 0.022 |
| 8 th disc | 4.83 | 0.121 | 0.025 | 0.01 | 0.005 | 0.005 | 0.032 | 0.022 |
| No. 11 disc | 4.9 | 0.128 | 0.025 | 0.01 | 0.005 | 0.006 | 0.028 | 0.022 |
| The 15 th disc | 4.78 | 0.124 | 0.025 | 0.01 | 0.005 | 0.006 | 0.031 | 0.022 |
| Extremely poor/% of | 0.2 | 0.007 | 0 | 0 | 0 | 0.001 | 0.007 | 0.001 |
| Segregation rate/%) | 4.172 | 5.663 | 0.000 | 0.000 | 0.000 | 17.241 | 24.476 | 4.587 |
| Actual yield/% | - | - | - | - | - | - | - | 94.10 |
In the invention, the 4043 aluminum alloy rod is coiled, and taking the 2 nd disc as an example, the 2 nd disc refers to the 2 nd disc, 14-17 th rolls are generally produced in one furnace, and the 2 nd disc, the 5 th disc, the 8 th disc, the 11 th disc and the 15 th disc represent the conditions of the middle and later stages before the cast-rolling production.
Example 2
4043 the Sr content target value for the aluminum alloy rod is 0.025wt.%:
1. preparing uniform-composition stable aluminum strontium rods, wherein the Sr content of the aluminum strontium rods is 10wt.%, the diameter of the aluminum strontium rods is 9.5mm, and the weight of the aluminum strontium rods is 1.2 times of the theoretical addition amount of each batch of production.
2. Preparing a wire feeding machine, installing an aluminum strontium rod on the wire feeding machine before use, and debugging and operating.
3. After finishing other preparation work before casting and rolling, discharging 4043 aluminum alloy melt from the tilting furnace, adding an aluminum strontium rod for online modification, starting casting and rolling production, and keeping the aluminum alloy melt in the launder stably flowing without disturbing the melt in the casting and rolling process.
4. The adding mode of the aluminum strontium rod is as follows: the aluminum strontium rod is directly fed into the launder to be mixed with the aluminum alloy melt, and the adding direction of the aluminum strontium rod is opposite to the flowing direction of the aluminum alloy melt.
5. Adding position of the aluminum strontium rod: the adding position of the aluminum strontium rod is 15 meters away from the pouring gate of the crystallization wheel.
6. Adding temperature of the aluminum strontium rod: the temperature of the aluminum alloy melt in the launder was 790 ℃.
7. The formula of the online addition rate of the aluminum strontium rod is shown in formula 1 in example 1:
in this example, v Melt body Is 0.102 t.min -1 ，C Sr 0.025wt.%, C 0 0wt.% and p of 2.7t/m 3 Pi is 3.14, r is 0.00475m Sr Is 10wt.%, eta is 94% of the experimental value, and v is calculated Aluminum strontium rod Is 1.42m/min.
8. The components of the tail stems are detected at the middle and late stages, and the detection results of the components are shown in table 2.
Table 2 example 2 in-line Sr modification 4043 aluminum alloy rod composition (wt.%), balance Al
| Product sample ingredients | Si | Fe | Cu | Mg | Mn | Zn | Ti | Sr |
| 2 nd disc | 4.7 | 0.128 | 0.022 | 0.01 | 0.004 | 0.006 | 0.027 | 0.025 |
| 5 th disc | 4.85 | 0.126 | 0.022 | 0.01 | 0.004 | 0.005 | 0.026 | 0.024 |
| 8 th disc | 4.93 | 0.125 | 0.022 | 0.01 | 0.004 | 0.005 | 0.027 | 0.025 |
| No. 11 disc | 4.73 | 0.129 | 0.022 | 0.01 | 0.004 | 0.005 | 0.026 | 0.025 |
| The 15 th disc | 4.85 | 0.124 | 0.022 | 0.01 | 0.004 | 0.005 | 0.026 | 0.025 |
| Extremely poor/% | 0.23 | 0.005 | 0 | 0 | 0 | 0.001 | 0.001 | 0.001 |
| Degree of segregation% | 4.780 | 3.956 | 0.000 | 0.000 | 0.000 | 19.231 | 3.788 | 4.032 |
| Actual yield/% | - | - | - | - | - | - | - | 93.88 |
Example 3
The Sr content target value for 4043 aluminum alloy rods was 0.028wt.%:
1. preparing uniform-composition stable aluminum strontium rods, wherein the Sr content of the aluminum strontium rods is 10wt.%, the diameter of the aluminum strontium rods is 9.5mm, and the weight of the aluminum strontium rods is 1.2 times of the theoretical addition amount of each batch of production.
2. Preparing a wire feeding machine, installing an aluminum strontium rod on the wire feeding machine before use, and debugging and operating.
3. After finishing other preparation work before casting and rolling, discharging 4043 aluminum alloy melt from the tilting furnace, adding an aluminum strontium rod for online modification, starting casting and rolling production, and keeping the aluminum alloy melt in the launder stably flowing without disturbing the melt in the casting and rolling process.
4. The adding mode of the aluminum strontium rod is as follows: the aluminum strontium rod is directly fed into the launder to be mixed with the aluminum alloy melt, and the adding direction of the aluminum strontium rod is opposite to the flowing direction of the aluminum alloy melt.
5. Adding positions of aluminum strontium rods: the adding position of the aluminum strontium rod is 15 meters away from the pouring gate of the crystallization wheel.
6. Adding temperature of the aluminum strontium rod: the temperature of the aluminium alloy melt in the launder was 790 ℃.
7. The formula of the online addition rate of the aluminum strontium rod is shown in formula 1 in example 1:
in this example, v Melt body Is 0.102 t.min -1 ，C Sr 0.028wt.%, C 0 0wt.%, p 2.7t/m 3 Pi is 3.14, r is 0.00475m Sr Is 10wt.%, eta is 94% of the empirical value, and v is calculated Aluminum strontium rod Is 1.59m/min.
8. The components of the tail rod are detected in the early, middle and late stages, and the detection results of the components are shown in table 3.
Table 3 example 3 in-line Sr modification 4043 aluminum alloy rod composition (wt.%), balance Al
From the test data in tables 1 to 3, it can be seen that the 4043 aluminum alloy rod had a range of 0 to 0.001% in the range of segregation, 0 to 5% in the range of segregation, very uniform in the strontium content, and a high actual yield of the strontium element of 93.5 to 94.5%.
Comparative example
1. Preparing an aluminum strontium ingot with uniform and stable components, wherein the Sr content of the aluminum strontium ingot is 10wt.%, and the weight of the aluminum strontium ingot is 1.2 times of the theoretical addition amount of each batch of production.
2. Smelting and refining 4043 aluminum alloy raw and auxiliary materials (electrolytic copper, aluminum-silicon intermediate alloy and aluminum-titanium intermediate alloy), adding all aluminum strontium ingots at one time after the components are detected to be qualified, and stirring uniformly.
3. Standing for 10-20 min, sampling in a furnace to analyze the strontium content, starting cast rolling production after the Sr is qualified, and keeping the melt flowing stably without disturbing the aluminum alloy melt in the launder in the cast rolling process.
4. And taking tail rods at the front, middle and later stages to detect components, and performing the three groups of tests, wherein the component detection results are shown in tables 4-6.
TABLE 4 Sr-modified 4043 aluminum alloy rods in the first group of furnaces, with the balance being Al (in wt.%)
| Product-like ingredients | Si | Fe | Cu | Mg | Mn | Zn | Ti | Sr |
| 2 nd disc | 4.78 | 0.118 | 0.027 | 0.01 | 0.004 | 0.006 | 0.024 | 0.025 |
| 5 thDisc | 4.85 | 0.123 | 0.022 | 0.01 | 0.004 | 0.005 | 0.023 | 0.02 |
| 8 th disc | 4.93 | 0.127 | 0.024 | 0.01 | 0.004 | 0.006 | 0.025 | 0.022 |
| No. 11 disc | 4.92 | 0.125 | 0.023 | 0.01 | 0.004 | 0.006 | 0.023 | 0.018 |
| The 15 th disc | 4.87 | 0.127 | 0.025 | 0.01 | 0.004 | 0.006 | 0.025 | 0.016 |
| Extreme difference | 0.15 | 0.009 | 0.005 | 0 | 0 | 0.001 | 0.002 | 0.009 |
| Degree of segregation% | 3.08 | 7.26 | 20.66 | 0.00 | 0.00 | 17.24 | 8.33 | 44.55 |
| Actual yield/% | - | - | - | - | - | - | - | 80.80％ |
TABLE 5 Sr modified 4043 Al alloy rods in the second group of furnaces, balance Al
TABLE 6 Sr modified 4043 Al alloy rod in the third group of furnace (wt.%), balance Al
| Product-like ingredients | Si | Fe | Cu | Mg | Mn | Zn | Ti | Sr |
| No. 3 disc | 4.91 | 0.121 | 0.022 | 0.01 | 0.004 | 0.004 | 0.025 | 0.025 |
| 5 th disc | 4.87 | 0.118 | 0.023 | 0.01 | 0.004 | 0.004 | 0.023 | 0.016 |
| 8 th disc | 5.01 | 0.117 | 0.022 | 0.01 | 0.004 | 0.004 | 0.024 | 0.02 |
| The 11 th disc | 4.96 | 0.119 | 0.022 | 0.01 | 0.004 | 0.004 | 0.027 | 0.018 |
| The 15 th disc | 5.01 | 0.121 | 0.023 | 0.01 | 0.004 | 0.004 | 0.025 | 0.018 |
| Extreme difference | 0.14 | 0.004 | 0.001 | 0 | 0 | 0 | 0.004 | 0.009 |
| Degree of segregation% | 2.83 | 3.36 | 4.46 | 0.00 | 0.00 | 0.00 | 16.13 | 46.39 |
| Actual yield/% | - | - | - | - | - | - | - | 77.60％ |
As is clear from tables 4 to 6, the Sr content of the Sr modified 4043 aluminum alloy rod in the furnace was 0.009 to 0.010% in the range, the range was large, the segregation rate was 40 to 55%, the segregation rate was large, the practical yield was 74 to 81%, and the practical yield was low.
The Sr in the furnace is adopted to modify to produce the 4043 aluminum alloy rod, and the strontium content in the aluminum alloy melt can be gradually reduced along with the increase of time in the production process, so that the deviation of the strontium content in the later period before the whole furnace is produced is large, the obtained 4043 aluminum alloy rod has poor uniformity, large modification effect difference and unstable quality.
Economic benefits
According to measurement and calculation, under the condition that the average strontium content of the 4043 aluminum alloy rod is the same, the online Sr modification technology has certain economic benefit when modification is carried out. The calculation method is shown in formula 2:
delta = online Sr modified aluminum strontium rod cost-in-furnace Sr modified aluminum strontium ingot cost
＝C Sr ×(P Aluminum strontium rod /η On-line Sr modification -P Aluminum strontium ingot /η Deterioration of Sr in furnace ) Formula 2;
in the formula 2, delta is the cost difference between the online Sr modification method and the in-furnace Sr modification method for producing 1 ton 4043 aluminum alloy rods;
C Sr target value of Sr content in wt.% for 4043 aluminum alloy rod;
P aluminum strontium rod Is the unit price of the aluminum strontium rod and has the unit of t -1 ；
η On-line Sr modification The method is characterized in that the yield of strontium in the aluminum-strontium rod in the 4043 aluminum alloy rod is obtained by using an online Sr modification method, and the unit is;
P aluminum strontium ingot Is the unit price of the aluminum strontium ingot, and the unit is element.t -1 ；
η Deterioration of Sr in furnace The actual yield of strontium in a 4043 aluminum alloy rod is expressed in% by using a method of modifying Sr in an aluminum furnace.
Taking a 4043 aluminum alloy rod with a Sr content target value of 0.025wt.%, market data of an aluminum strontium rod (Sr content of 10 wt.%) with a unit price of 37000 yuan/t are collected; the unit price of the aluminum strontium ingot (Sr content is 10 wt.%) is 34000 yuan/t; the actual yield of the strontium-aluminum rod by the online Sr modification technology of the production process data is collected to be 93.5-94.5 percent; the actual yield of the aluminum strontium ingot by the Sr modification technology in the furnace is 74-81%, and the intermediate value of the aluminum strontium ingot are 94% and 77.5%, respectively.
Then, Δ = C Sr ×(P Aluminum strontium rod /η On-line Sr modification -P Aluminum strontium ingot /η Deterioration of Sr in furnace )
=0.025wt.% (37000/94% -34000/77.5%) = -1.17 yuan/t
Therefore, the cost of producing 1 ton of 4043 aluminum alloy rod by using the online Sr modification technology is 1.17 yuan less than that of Sr modification in a furnace.
In conclusion, compared with the in-furnace Sr modification, the in-line Sr modification can greatly improve the uniformity of the strontium element component, enhance the uniformity of modification effect, facilitate the preparation and production of high-quality welding wires and slightly reduce the cost.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An online Sr modification method of aluminum alloy comprises the following steps:
and adding an aluminum strontium rod in the flowing process of the aluminum alloy melt, and performing Sr modification treatment to obtain the target aluminum alloy.
2. The in-line Sr modification method of claim 1, wherein the aluminum strontium rod is added in a direction opposite to the flow direction of the aluminum alloy melt.
3. The online Sr alternate method of claim 1, wherein the online adding speed of the aluminum strontium bar is as shown in formula 1:
in the formula 1, v Aluminum strontium rod On-line addition of aluminum strontium rodsAcceleration in m.min -1 ；
v Melt body Is the flow rate of the aluminum alloy melt and has the unit of t.min -1 ；
C Sr Sr content in wt.% for the target aluminum alloy;
C 0 is the Sr content of the aluminum alloy melt in wt.%;
rho is the density of the aluminum strontium rod and is t/m 3 ；
Pi is the circumference ratio;
r is the radius of the aluminum strontium rod and is in m;
c Sr strontium content in wt.% for aluminum strontium rods;
eta is the actual yield of the strontium element added with the aluminum strontium rod in the target aluminum alloy, and the unit is percent.
4. The on-line Sr modification method of claim 1 or 3, wherein the flow rate of the aluminum alloy melt is 0.09 to 0.11 t-min -1 。
5. The on-line Sr modification method of claim 1 or 3, wherein the strontium content of the aluminum strontium bar is 9-11 wt.%.
6. The on-line Sr modification method according to claim 1, wherein the temperature of the Sr modification treatment is 730 to 800 ℃.
7. The on-line Sr modification method according to claim 1, wherein the on-line Sr modification method is performed using an aluminum alloy melting apparatus; the aluminum alloy smelting device comprises a tilting furnace, a launder and a crystallization wheel which are connected in sequence;
adding an aluminum strontium rod in the process that the aluminum alloy melt enters a crystallization wheel from a turnover furnace through a launder;
the aluminum strontium rod is added in the runner, and the adding position of the aluminum strontium rod is 5 meters or more away from the pouring gate of the crystallization wheel.
8. The in-line Sr modification method of claim 1, wherein the aluminum alloy melt is a 4043 aluminum alloy melt.
9. The in-line Sr modification method of claim 7, wherein the target aluminum alloy is a 4043 aluminum alloy rod.
10. The on-line Sr modification method according to claim 1 or 7, further comprising a casting and rolling process after the Sr modification treatment.
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| CN103008345A (en) * | 2012-12-03 | 2013-04-03 | 三门峡天一铝业有限公司 | Continuous roll-casting production process of aluminum alloy |
| CN103740958A (en) * | 2014-01-09 | 2014-04-23 | 佛山市深达美特种铝合金有限公司 | 4032 aluminum alloy and modification method thereof |
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| CN103008345A (en) * | 2012-12-03 | 2013-04-03 | 三门峡天一铝业有限公司 | Continuous roll-casting production process of aluminum alloy |
| CN103740958A (en) * | 2014-01-09 | 2014-04-23 | 佛山市深达美特种铝合金有限公司 | 4032 aluminum alloy and modification method thereof |
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