WO2023035831A1 - Alliage d'aluminium pour extrusion et procédé de préparation associé - Google Patents

Alliage d'aluminium pour extrusion et procédé de préparation associé Download PDF

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Publication number
WO2023035831A1
WO2023035831A1 PCT/CN2022/110595 CN2022110595W WO2023035831A1 WO 2023035831 A1 WO2023035831 A1 WO 2023035831A1 CN 2022110595 W CN2022110595 W CN 2022110595W WO 2023035831 A1 WO2023035831 A1 WO 2023035831A1
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WIPO (PCT)
Prior art keywords
aluminum
extrusion
aluminum alloy
temperature
refining
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PCT/CN2022/110595
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English (en)
Chinese (zh)
Inventor
赵立洋
张桓
乔恒
段妍彤
张军
金榕
章安楠
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江苏亨通电力特种导线有限公司
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Publication of WO2023035831A1 publication Critical patent/WO2023035831A1/fr

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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/066—Treatment of circulating aluminium, e.g. by filtration
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • 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
    • C22C1/026—Alloys based on aluminium
    • 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
    • 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
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

  • the invention relates to the field of aluminum alloy die-casting processing, in particular to an aluminum alloy for extrusion and a preparation method thereof.
  • Aluminum alloy extrusion products are widely used in automobiles, airplanes, home appliances and other fields.
  • the processing cost due to die loss accounts for 30% of the total cost, and the average production of 3.5 tons of extruded products
  • Existing aluminum alloy materials have poor fluidity and ductility, and wall breakage often occurs when extruding thin-walled products, resulting in cost losses.
  • problems such as poor structural continuity, poor corrosion resistance, and coarse grains leading to poor toughness of aluminum alloy materials. Therefore, there is still a need for an aluminum alloy material to improve the extrusion performance of the material, which is suitable for extrusion products with complex structures or thin-wall structures, and prolongs the service life of extrusion dies.
  • the present invention provides an aluminum alloy for extrusion and a preparation method thereof, which have significantly improved corrosion resistance, material strength, fluidity and tissue continuity.
  • the present invention claims to protect an aluminum alloy for extrusion, its components and the mass percentage of each component are: Si 0.1-0.2%, Fe 0.15-0.25%, Mn 1.8-2.4%, Zn 0.05-0.18%, Er 0.03 -0.06%, Ti 0.008-0.04%, Be 0.04-0.08%, V 0.01-0.02%, the rest are Al and unavoidable impurities, and the total amount of impurities does not exceed 0.015%.
  • the components of the aluminum alloy for extrusion and the mass percent of each component are: Si 0.18%, Fe 0.23%, Mn 2.23%, Zn 0.14%, Er 0.05%, Ti 0.02%, Be 0.06%, V 0.015 %, the rest is Al and unavoidable impurities, the total amount of impurities is not more than 0.015%.
  • the preparation method of aluminum alloy for extrusion of the present invention comprises the following steps:
  • S2 Add an intermediate alloy to the first aluminum liquid in the holding furnace, stir for 25-35 minutes, and obtain the second aluminum liquid; wherein, the temperature of the holding furnace is 780-800°C, and the intermediate alloy is one or more types, containing Si , Fe, Mn, Zn, Er, Ti, Be and V;
  • the medium-strength aluminum alloy materials used for extrusion in the industry mainly use Mn as the main element.
  • Mn has the advantages of improving strength and corrosion resistance of materials, but there are the following problems: (1) High slag content, extrusion The material has very strict requirements on the slag content of the structure. During the extrusion process, these impurities will form hard spots, which will increase the wear of the mold, and will destroy the continuity of the structure and affect the quality of the extruded product; (2) The structure is not uniform , High manganese element is easy to segregate, grain growth is uneven after annealing, material properties are unstable, aluminum sticking and wall breaking are easy to occur during extrusion, which reduces mold life and product quality.
  • the present invention obtains a high-strength, high-fluidity, high-ductility and corrosion-resistant aluminum alloy material by improving the raw material composition and proportion of the aluminum alloy, and cooperating with the production process and heat treatment process.
  • step S1 the time for one refining is 35-45 minutes.
  • step S1 or S3 a refining agent is added at a rate of 2-3 kg/t of aluminum liquid.
  • the pore size of the second filter is 60 mesh, and the pore size of the first filter is smaller than 60 mesh, preferably 40 mesh.
  • step S5 the speed of feeding the AlTiC wire is 1.5-2.0 m/min.
  • AlTiC is selected as the refiner to avoid the formation of hard phase, thereby reducing the loss of the die during the extrusion process and increasing the continuity of the product.
  • the titanium content in the molten aluminum can be kept fluctuating within 0.008-0.04%.
  • step S5 horizontal casting is performed on the fourth molten aluminum.
  • step S5 the pore size of the casting filter is 16 mesh.
  • step S6 the flow rate of the rolling emulsion is 35-38 m 3 /h, the pressure is 180-200 kPa, and the final rolling temperature can be adjusted by the flow rate and pressure of the rolling emulsion.
  • step S7 keep warm for 90-96h.
  • the present invention also claims extruded products prepared using the aforementioned aluminum alloys.
  • the present invention has at least the following advantages:
  • Mn can improve the corrosion resistance of aluminum alloys. Its maximum solid solubility in aluminum is 1.82%. Excessive Mn content can easily lead to intragranular segregation. The content of Mn in the medium can achieve corrosion resistance. By adding Fe, it can form FeMnAl 6 phase with Mn, reduce the solid solution of Mn in the aluminum matrix, and improve the ductility of the alloy. At the same time, cooperate with Zn and Er to further reduce the solid solution of Mn And reduce the segregation phenomenon, refine the coarse phase in the structure, and significantly improve the mechanical properties of the material.
  • the present invention matches the heat treatment process of the present invention by adding Er, Si, and Be to heat treatment at low temperature for a long time, so that the compound dissolved in the aluminum matrix is slowly precipitated, the amount of manganese element precipitation is promoted, and the growth of the precipitated phase is suppressed at the same time.
  • Large, to realize the fine and dispersed distribution of the second phase improve the extrusion fluidity of the alloy material, avoid the coarse grains caused by high temperature annealing, and provide an alloy material with excellent toughness.
  • Figure 1 shows the aluminum alloys prepared in Example 1 and Comparative Examples 2, 8, and 9.
  • the components of aluminum alloy for extrusion and the mass percentage of each component are: Si 0.18%, Fe 0.23%, Mn 2.23%, Zn 0.14%, Er 0.05%, Ti 0.02%, Be 0.06%, V 0.015%, the rest Al and unavoidable impurities, the total amount of impurities is not more than 0.015%.
  • the preparation method of aluminum alloy for extrusion comprises the following steps:
  • the components of the aluminum alloy for extrusion and the mass percentage of each component are: Si 0.1%, Fe 0.16%, Mn 1.8%, Zn 0.18%, Er 0.06%, Ti 0.015%, Be 0.08%, V 0.02%, the rest Al and unavoidable impurities, the total amount of impurities is not more than 0.015%.
  • the preparation method of aluminum alloy for extrusion comprises the following steps:
  • S5 Continuously cast the molten aluminum after the online treatment of S4, adopt horizontal casting, and add a 16-mesh casting filter to filter the scale at the gate, control the casting temperature to 710°C, the casting speed to 6.5t/h, and the cooling water temperature 35°C, and the billet temperature is 520°C.
  • the components of aluminum alloy for extrusion and the mass percentage of each component are: Si 0.2%, Fe 0.2%, Mn 2%, Zn 0.05%, Er 0.03%, Ti 0.04%, Be 0.04%, V 0.01%, the rest Al and unavoidable impurities, the total amount of impurities is not more than 0.015%.
  • the preparation method of aluminum alloy for extrusion comprises the following steps:
  • a filter plate which is respectively the 40 mesh filter plate of the front channel and the 60 mesh filter plate of the rear channel, performs double-stage filtration.
  • S5 Continuously cast the molten aluminum after S4 on-line treatment, adopt horizontal casting, and add a 16-mesh casting filter to filter the scale at the gate, control the casting temperature to 720°C, the casting speed to 7.5t/h, and the cooling water temperature 25°C, and the billet temperature is 550°C.
  • Si is not added to the composition of the aluminum alloy for extrusion, and the rest is the same as in Example 1.
  • the temperature during the annealing treatment in S7 was 560° C., and the rest were the same as in Example 1.
  • the time during the annealing treatment in S7 was 85h (a) and 103h (b), and the rest were the same as in Example 1.
  • Example 1 has increased respectively compared with Comparative Examples 1-9: 9.52%, 8.49%, 8.49%, 16.16%, 7.48%, 9.52%, 17.35%, 15%, 15% (a), 12.75% (b); From elongation aspect, embodiment 1 has improved respectively compared with example 1-9: 30.56%, 34.29%, 30.56%, 56.67%, 27.03%, 38.24%, 56.67%, 38.24% %, 42.42% (a), 38.24% (b); from the aspect of product qualified rate, the unqualified rate of embodiment 1 has reduced respectively compared with comparative example 1-9: 82.76%, 79.17%, 81.48%, 84.38%, 79.17% %, 80%, 82.76%, 77.27%, 82.14% (a), 82.76% (b); from the aspect of mold life, embodiment 1 has improved respectively compared with comparative example 1-9: 27.91%, 25%, 22.22%, 197.3%, 26.44%,
  • embodiment 1 has improved 2.4 compared with comparative example 1, and embodiment 1 has improved 2.2 compared with comparative example 2, and embodiment 1 has improved 2 compared with comparative example 3, and embodiment 1 has improved 7.3 compared with comparative example 4 , the difference sum of comparative examples 1-3 and embodiment 1 is 6.4 (7.3 less than the difference value 7.3 of comparative example 4 and embodiment 1), it can be seen that the combined effect of Er, Si and Be improves the sum of the effect of using separately than respectively up 10.61%.
  • the present invention increases the content of manganese element, forms FeMnAl 6 phase by adding Zn, Fe, Er, reduces the solid solution of Mn in the aluminum matrix, and improves the ductility of the alloy. At the same time, it cooperates with Zn and Er to further reduce the solid solution of Mn and reduce the segregation phenomenon, refine the coarse phase in the structure, and solve the problem of high segregation and unevenness of Mn element.
  • Zn and Er can assist in the elimination of Si element Existing broken wall or shrinkage porosity problem, Zn, Fe, Er can significantly improve the processing performance of aluminum alloy material; From the above table we can know (also taking extrusion die life as an example), embodiment 1 has improved 2.4% compared with comparative example 1 , embodiment 1 has improved 2.3 compared with comparative example 5, and embodiment 1 has improved 2.1 compared with comparative example 6, and embodiment 1 has improved 7.5 compared with comparative example 7, and the difference sum of comparative examples 1,5,6 and embodiment 1 is 6.8 (7.5 less than the difference between Comparative Example 7 and Example 1), it can be seen that the combined effect of Er, Fe and Zn is 10.29% higher than the sum of the effects of separate use. Therefore, there is a synergistic effect among various elements in the present invention, which improves the comprehensive performance of the aluminum alloy material, and each component is indispensable.
  • the present invention improves the performance of the material by optimizing the production process and heat treatment process: during the production process, refining is carried out in both the smelting furnace and the holding furnace, two-stage filtration is added and casting filter screens are added to filter most of the impurities, and the substrate is purified with Er and other elements; the heat treatment process Among them, the inventors have found through a large number of experiments that the optimal heat treatment condition is to keep warm at 450-460°C for 88-100h, and the grains grow uniformly after annealing, as shown in Figure 1 (A is the aluminum alloy prepared in Example 1, and B is the The aluminum alloy prepared in Example 8, C is the aluminum alloy b prepared in Comparative Example 9, and D is the aluminum alloy prepared in Comparative Example 2), the grain size in A is uniform, while the extruded walls of B-D are uneven, and C is due to the excessive holding time Long, coarse grains, and segregation phenomenon occurs in the preparation process, the material performance is unstable during extrusion, and aluminum sticking and wall breaking appear.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Extrusion Of Metal (AREA)
  • Continuous Casting (AREA)

Abstract

La présente invention concerne un alliage d'aluminium destiné à l'extrusion. Les constituants de l'alliage d'aluminium et le pourcentage en masse de chaque constituant sont les suivants : 0,1-0,2 % de Si, 0,15-0,25 % de Fe, 1,8-2,4 % de Mn, 0,05-0,18 % de Zn, 0,03-0,06 % d'Er, 0,008-0,04 % de Ti, 0,04-0,08 % de Be et 0,01-0,02 % de V, le reste étant de l'Al et des impuretés inévitables, la quantité totale des impuretés étant inférieure ou égale à 0,015 %. L'alliage d'aluminium est préparé au moyen des étapes du processus comprenant la fusion, l'alliage, l'affinage, le traitement en ligne de l'aluminium fondu, la coulée continue, le laminage continu, le refroidissement et la reprise, le traitement de recuit, etc. L'alliage d'aluminium de la présente invention est amélioré considérablement quant à la résistance à la corrosion, la résistance du matériau, la fluidité et la continuité structurale, de sorte que la capacité de support de pression d'un matériau d'extrusion préparé soit améliorée considérablement, et que sa durée de vie soit prolongée.
PCT/CN2022/110595 2021-09-08 2022-08-05 Alliage d'aluminium pour extrusion et procédé de préparation associé WO2023035831A1 (fr)

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Cited By (1)

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CN116555606A (zh) * 2023-05-15 2023-08-08 上海萨新东台热传输材料有限公司 一种耐磨型铝合金管道的制备方法

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CN113846249B (zh) * 2021-09-08 2022-07-08 江苏亨通电力特种导线有限公司 一种挤压用铝合金及其制备方法

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CN102286679A (zh) * 2011-09-02 2011-12-21 上海交通大学 用于热交换器的稀土铝合金及其制备方法
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CN116555606B (zh) * 2023-05-15 2024-01-02 上海萨新东台热传输材料有限公司 一种耐磨型铝合金管道的制备方法

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