WO2005075691A1 - 熱交換器用高強度アルミニウム合金フィン材およびその製造方法 - Google Patents
熱交換器用高強度アルミニウム合金フィン材およびその製造方法 Download PDFInfo
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- WO2005075691A1 WO2005075691A1 PCT/JP2005/001195 JP2005001195W WO2005075691A1 WO 2005075691 A1 WO2005075691 A1 WO 2005075691A1 JP 2005001195 W JP2005001195 W JP 2005001195W WO 2005075691 A1 WO2005075691 A1 WO 2005075691A1
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- Prior art keywords
- brazing
- less
- fin material
- thickness
- cold
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 26
- 238000005219 brazing Methods 0.000 claims abstract description 89
- 238000000137 annealing Methods 0.000 claims abstract description 52
- 238000005097 cold rolling Methods 0.000 claims abstract description 27
- 230000003628 erosive effect Effects 0.000 claims abstract description 27
- 239000012535 impurity Substances 0.000 claims abstract description 24
- 238000005260 corrosion Methods 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 23
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 230000002829 reductive effect Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000009751 slip forming Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000007665 sagging Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 52
- 238000001816 cooling Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 239000002244 precipitate Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 7
- 239000006104 solid solution Substances 0.000 description 7
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 238000001953 recrystallisation Methods 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000002210 silicon-based material Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 3
- 229910018131 Al-Mn Inorganic materials 0.000 description 2
- 229910018461 Al—Mn Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910018182 Al—Cu Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0605—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two belts, e.g. Hazelett-process
-
- 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
- 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
-
- 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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- 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
-
- 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
- C22F1/043—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 of alloys with silicon as the next major constituent
-
- 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
- C22F1/053—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 of alloys with zinc as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
Definitions
- the present invention relates to an aluminum alloy fin material for a heat exchanger having excellent brazing properties and a method for manufacturing the same, and more specifically, a fin and a working fluid passage forming material such as a radiator, a car heater, and a car air conditioner.
- Heat exchangers such as radiators, air conditioners, intercoolers, and oil coolers for automobiles are composed of working fluid passage materials such as Al-Cu alloys, Al-Mn alloys, and Al_Mn_Cu alloys, and A1-Mn alloys. It is assembled by brazing fins made of alloy or the like.
- the fin material is required to have a sacrificial anode effect in order to prevent the material constituting the working fluid passage from being corroded, and to have excellent sag resistance and resistance to deformation due to high temperature heating during brazing and penetration of the brazing. Erosion is required.
- the conventional A1-Mn alloy has a problem that thermal conductivity is reduced because Mn is dissolved by heating during brazing.
- an aluminum alloy with an Mn content of 0.8 wt% or less and containing Zr: 0.02-0.2 wt% and Si: 0.1-0.8 wt% is proposed.
- Patent Document 3 Japanese Patent Publication No. 63-23260
- this alloy has improved thermal conductivity, it has a low Mn, so its strength after brazing is insufficient, it is easy for fins to collapse or deform during use as a heat exchanger, and its potential is sufficiently low. Therefore, there is a disadvantage that the sacrificial anode effect is small.
- the content of Si, Mn, and the like is set to 0.05 to 1.5 mass% even when the slab is crystallized. It has become possible to reduce the size of the intermetallic compound that has been discharged to a maximum value of 5 ⁇ m or less, and it has been proposed to improve the fatigue properties of fin materials by passing the slab through a rolling process (patented).
- Reference 4 JP-A-2001-226730.
- the purpose of the present invention is to improve the fatigue life, and although there is a description of means to increase the cooling rate at the time of manufacturing the slab, such as making the slab thinner, the twin belt at the actual operation scale is used. No specific disclosure such as continuous production of thin slabs by a construction machine is found.
- Patent Document 1 JP-A-62-120455
- Patent Document 2 JP-A-50-118919
- Patent Document 3 Japanese Patent Publication No. 63-23260
- Patent Document 4 JP 2001-226730A
- An object of the present invention is to have a moderate strength before brazing, which facilitates fin molding, a high strength after brazing, a sag resistance, an erosion resistance, a self-corrosion resistance, and a sacrifice.
- a method for producing an aluminum alloy fin material for a heat exchanger of the present invention is as follows: Si: 0.8 to 1.4 wt%, Fe: 0.15 to 0.7 wt%, Mn: 1. 5 ⁇ 3. Owt%, Zn: 0.5-2.5. 5wt%, Mg as impurity is limited to 0.05wt% or less, and the remainder is poured with molten metal consisting of ordinary impurities and A1. Then, a thin slab with a thickness of 5 10 mm was continuously formed by a twin-belt type forming machine, then cold-rolled to a thickness of 0.05-2.0 mm, and subjected to intermediate annealing at 350-500 ° C.
- the present invention includes the following five embodiments.
- the continuously formed thin slab is once rolled and then cold rolled.
- Si 0.8—1.4 wt%
- Fe 0.15—0.7 wt%
- Mn l. 5—3.0 wt%
- Zn 0.5— 2.
- a first embodiment of the present invention is a high-strength aluminum alloy fin material for a heat exchanger having high strength and excellent heat transfer properties, erosion resistance, sag resistance, sacrificial anode effect, and self-corrosion resistance. It is.
- Si 0.8—1.4 wt%
- Fe 0.15—0.7 wt%
- Mn l. 5—3.0 wt%
- Zn 0.5—2.
- Mg as an impurity is limited to 0.05wt% or less, the balance consists of ordinary impurities and A1, the tensile strength before brazing is 240MPa or less, the tensile strength after brazing is 150MPa or more, and High strength and excellent heat transfer properties, erosion resistance, sag resistance, sacrificial anode effect, self-corrosion resistance, high heat exchanger characteristics characterized by a recrystallized grain size of 500 ⁇ m or more after brazing.
- a high-strength aluminum alloy fin material is a second embodiment of the present invention.
- Si 0.8—1.4 wt%
- Fe 0.15—0.7 wt%
- Mn l. 5—3.0 wt%
- Zn 0.5—2.
- a third embodiment of the present invention is a method for producing a high-strength aluminum alloy fin material for a heat exchanger having a tensile strength of 240 MPa or less and a tensile strength after brazing of 150 MPa or more.
- Si 0.8-1.4 wt%
- Fe 0.15-0.7 wt%
- Mn l-5-3.Owt%
- Zn 0.5-2.
- the fourth embodiment of the present invention is a method for producing a high-strength aluminum alloy fin material for a heat exchanger having a tensile strength of 150 MPa or more.
- Si 0.8—1.4 wt%
- Fe 0.15—0.7 wt%
- Mn l. 5—3.
- Zn 0.5—2.
- the fifth invention is a method for producing a high-strength aluminum alloy fin material for a heat exchanger having a tensile strength before brazing of 240 MPa or less and a tensile strength after brazing of 150 MPa or more, which is characterized by performing final annealing.
- the present invention has an appropriate tensile strength before brazing, which is easy to form a fin, and high strength after brazing, and has heat transfer characteristics, sag resistance, erosion resistance, self-corrosion resistance, and a sacrificial anode.
- An aluminum alloy fin material for a heat exchanger having excellent effects is provided.
- the present inventor has sought to reduce the thickness of the fin material for heat exchangers by using aluminum.
- the rolled material from the conventional DC slab structure and the rolling from the twin-belt continuous structure were developed for strength properties, heat transfer performance, sag resistance, erosion resistance, self-corrosion resistance and sacrificial anode effect.
- the present invention was completed as a result of conducting various studies on the relationship between the composition, the intermediate annealing conditions, and the reduction ratio while comparing the materials.
- Si forms submicron-level Al_ (Fe'Mn) _Si-based compounds during brazing in coexistence with Fe and Mn, improves strength and at the same time reduces the amount of solid solution of Mn to reduce thermal conductivity. Improve. If the Si content is less than 0.8 wt%, the effect is not sufficient. If it exceeds 1.4 wt%, the fin material may be melted during brazing. Therefore, the preferred content range is 0.8-1.4 wt%. The more preferred content of Si is in the range of 0.9-1.4 wt%.
- Fe forms a submicron-level A1- (Fe'Mn) -Si compound during brazing when coexisting with Mn and Si, improving strength and reducing the amount of solid solution of Mn to conduct heat. Improve rates. If the Fe content is less than 0.15 wt%, a high-purity metal is required, which increases the production cost, which is not desirable. If the content exceeds 0.7%, coarse A1— (Fe′Mn) _Si-based crystallization occurs during the production of the alloy, and it becomes difficult to produce a sheet material. Therefore, the preferred content range is 0.1-0.7 wt%. A more preferred content of Fe is in the range of 0.117-0.6 wt%.
- Mn precipitates at a high density as a submicron-level Al_ (Fe′Mn) —Si-based compound at the time of brazing, and improves the strength of the alloy material after brazing.
- Al_ (Fe'Mn) _Si-based precipitates at the submicron level have a strong recrystallization inhibiting action, so that the recrystallized grains become coarser to 500 ⁇ m or more, and the sag resistance and erosion resistance are improved.
- Mn is less than 1.5 wt%, the effect is not sufficient.If it exceeds 3.0 wt%, coarse A1— (Fe ⁇ Mn) _Si-based crystallized substances are formed during the production of the alloy, making it difficult to produce sheet materials. When it comes In addition, the amount of solid solution of Mn increases and the thermal conductivity decreases. Therefore, a preferable content range is 1.5-3. Owt%. A more preferable content of Mn is 1.8-3.Owt%.
- Zn lowers the potential of the fin material and gives a sacrificial anode effect. If the content is less than 0.5 wt%, the effect is not sufficient. If it exceeds 2.5 wt%, the self-corrosion resistance of the material is deteriorated, and the thermal conductivity is reduced due to solid solution of Zn. Therefore, a preferable content range is 0.5 to 2.5 wt%. A more preferred content of Zn is in the range of 1.0-1.5 wt%.
- Mg affects the brazing properties, and if its content exceeds 0.05 wt%, it may impair the brazing properties.
- fluoride flux brazing fluorine (F), which is a component of the flux, easily reacts with Mg in the alloy, and effectively acts during brazing due to the formation of compounds such as MgF. Insufficient amount of flux is generated, and poor brazing tends to occur. Therefore, the content of Mg as an impurity is limited to 0.05 wt% or less.
- Cu is preferably limited to 0.2 wt% or less in order to make the potential of the material noble.
- Cr, Zr, Ti, and V are heat conductive materials even in minute amounts. Therefore, it is preferable to limit the total content of these elements to 0.20 wt% or less, since this significantly lowers the content.
- the molten metal is poured between the rotating belts facing each other up and down, and the molten metal is solidified by cooling from the belt surface to form a slab.
- This is a continuous manufacturing method that draws out continuously and winds it into a coil.
- the thickness of the slab to be manufactured is preferably 5 to 10 mm. With this thickness, the solidification speed at the center of the plate thickness is increased, and the solid structure has a uniform structure.
- the composition falls within the range of the present invention, the amount of coarse compounds is small, and after brazing, the crystal grain size increases. A fin material having excellent properties can be obtained.
- the thickness of the thin slab by the twin-belt type forming machine is less than 5 mm, the forming is performed per unit time. The amount of aluminum passing through the machine is too small, making the construction difficult. Conversely, if the thickness exceeds 10 mm, winding by a roll becomes impossible, so that the range of the slab thickness is preferably 5 to 10 mm.
- the solidification speed of the molten metal during solidification be completed in a belt, which is preferably 515 mZ. If the production speed is less than 5 mZ minutes, it takes a long time to produce, and the production speed is too low, which is not preferable. When the production speed exceeds 15 mZ, the supply of molten aluminum cannot keep up, and it becomes difficult to obtain a thin slab of a predetermined shape.
- the holding temperature of the intermediate annealing is preferably 350-500 ° C. Intermediate annealing holding temperature 350. If it is less than C, a sufficiently soft state cannot be obtained. However, when the holding temperature of the intermediate annealing exceeds 500 ° C, most of the solute Mn that precipitates during brazing precipitates as relatively large A1- (Fe'Mn) -Si compounds during the intermediate annealing at high temperatures. As a result, the recrystallization inhibiting action during brazing is weakened, and the recrystallized grain size becomes less than 500 ⁇ m, and sag resistance and erosion resistance are reduced.
- the holding time of the intermediate annealing is not particularly limited, but is preferably in the range of 115 hours. If the holding time of the intermediate annealing is less than 1 hour, there is a possibility that a uniform recrystallized structure in the sheet may not be obtained until the temperature of the entire coil becomes uneven. If the holding time of the intermediate annealing exceeds 5 hours, precipitation of solid solution Mn progresses, and it is disadvantageous to secure a stable recrystallized grain size of 500 ⁇ m or more after brazing. It takes too much time and the productivity is lowered, which is not preferable.
- the rate of temperature rise and the rate of cooling during the intermediate annealing are not particularly limited, but are preferably 30 ° C / hour or more. If the heating rate and cooling rate during the intermediate annealing treatment are less than 30 ° C / hour, the precipitation of solid-solution Mn proceeds to ensure a stable recrystallization grain size of 500 ⁇ m or more after brazing. In addition, it is not preferable because not only is it disadvantageous, but too much time is required for processing, and productivity is reduced.
- the temperature of the intermediate annealing in the continuous annealing furnace is preferably 350 to 500 ° C. If the temperature is lower than 350 ° C, a sufficient softened state cannot be obtained. However, when the holding temperature exceeds 500 ° C, however, most of the solute Mn that precipitates during brazing precipitates as a relatively large Al_ (Fe'Mn) _Si-based compound during intermediate annealing at high temperatures, and the recrystallization inhibiting action during brazing is weakened. The crystal grain size becomes less than 500 ⁇ m, and sag resistance and erosion resistance decrease.
- the holding time of the continuous annealing is preferably within 5 minutes. If the holding time of continuous annealing exceeds 5 minutes, precipitation of solid solution Mn progresses, and it becomes disadvantageous to stably secure recrystallized grain size of 500 ⁇ m or more after brazing. It is not preferable because it takes too much time and productivity is reduced.
- the rate of temperature rise and the rate of cooling during the continuous annealing treatment be 100 ° C / min or more. If the rate of temperature rise during continuous annealing is less than 100 ° C./min, it takes too much time for the treatment and the productivity is reduced due to excessive heating.
- the final cold rolling reduction is preferably 10 96%. If the final cold rolling reduction is less than 10%, the strain energy accumulated in cold rolling is small, and recrystallization is not completed during the temperature rise process during brazing, so sag resistance and erosion resistance are reduced. If the final cold rolling rate exceeds 96%, ear cracks during rolling will be noticeable and the yield will decrease. If the product strength becomes too high depending on the composition and it becomes difficult to obtain the desired fin shape in fin forming, the final cold-rolled sheet is subjected to final annealing at a holding temperature of 300-400 ° C for about 11 to 13 hours. (Softening treatment) does not impair the properties.
- the fin material that has been subjected to intermediate annealing in a continuous annealing furnace and then subjected to final annealing (softening treatment) at a holding temperature of 300 to 400 ° C for about 11 to 13 hours on the finally cold-rolled sheet is as follows: It has excellent fin moldability, high strength and strength after brazing, and excellent sag resistance.
- the aluminum alloy fin material of the present invention is prepared by continuously forming a thin slab having a thickness of 5 to 10 mm by a twin belt type forming machine and winding the slab on a roll. Cold-rolled, subjected to intermediate annealing at a holding temperature of 350-500 ° C, cold-rolled at a cold rolling rate of 1096% to a final sheet thickness of 40-200 zm, and then held at a holding temperature as necessary. Final annealing (softening) at 300-400 ° C shall be applied.
- This plate material is slit to a predetermined width, then corrugated, and alternately laminated with a flat tube made of a cladding plate made of a working fluid passage material, for example, 3003 alloy coated with a brazing material, and brazed.
- a working fluid passage material for example, 3003 alloy coated with a brazing material
- the (Fe'Mn) -Si compound is uniformly and finely crystallized, and Mn and Si, which are dissolved in supersaturation in the mother phase A1, are submicron-level A1— ( It precipitates at high density as the Fe-Mn) _Si phase.
- the amount of solute Mn in the matrices which significantly reduces the thermal conductivity, is reduced, so that the electrical conductivity after brazing is increased, and excellent thermal conductivity is exhibited.
- the finely crystallized A1— (Fe′Mn) _Si-based compound and the densely precipitated submicron-level A1— (Fe′Mn) _Si phase have a high degree of dislocation during plastic deformation.
- the tensile strength of the final plate after brazing is high.
- the submicron-level Al_ (Fe'Mn) _Si phase precipitated during brazing has a strong recrystallization inhibiting action, the recrystallized grain size after brazing becomes 500 ⁇ m or more, so that sag resistance is reduced. It becomes good, and for the same reason, shows excellent erosion resistance even after brazing.
- the content of Mn is limited to 1.5 wt% or more in the present invention, the tensile strength does not decrease even if the average grain size of the recrystallized grains after brazing exceeds 3000 ⁇ m.
- the A1- (F e 'Mn) _Si-based compound crystallized in a thin slab in which the solidification speed of the molten metal is high becomes uniform and fine.
- the second phase particles having an equivalent circle diameter of 5 ⁇ or more due to coarse crystals do not exist, and excellent self-corrosion resistance is developed.
- the A1- (Fe'Mn) -Si compound in the slab mass is made uniform and fine, and the submicron level after brazing is obtained.
- A1— (Fe'Mn) High density of the Si phase precipitates and coarsening of the crystal grain size after brazing to 500 zm or more, resulting in strength, thermal conductivity, and sag resistance after brazing In addition, it enhances erosion resistance and self-corrosion, and at the same time, contains Zn to make the potential of the material low, thereby improving the sacrificial anode effect, and providing a durable aluminum alloy fin material for heat exchangers. be able to.
- Example 1 As an example of the present invention and a comparative example, a molten alloy having a composition of alloy numbers 1 to 13 shown in Table 1 was melted, passed through a ceramic filter, poured into a twin-belt forming mold, and formed at a forming speed of 8 m / m. A slab 7 mm thick was obtained in minutes. The cooling rate during solidification of the melt was 50 ° C / sec. The slab was cold-rolled to the sheet thickness shown in Table 2 to obtain a plate, and the temperature was raised at a rate of 50 ° CZ for 2 hours at each temperature shown in Table 2, and the cooling rate was 50 ° C / hour (100 ° C). Intermediate annealing (up to ° C) was performed. Next, this plate was cold-rolled to a fin material having a thickness of 50 ⁇ m.
- a molten alloy having the composition of alloy numbers 14 and 15 shown in Table 1 was melted and subjected to a conventional DC casting (thickness 500 mm, solidification cooling rate of about 1 ° C / sec), Fins with a thickness of 50 ⁇ m were produced by facing, soaking, hot rolling, cold rolling (84 zm thickness), intermediate annealing (400 ° CX for 2 hours), and cold rolling.
- the corrugated fin material is placed on a 0.25 mm thick brazing sheet (brazing material 4045 alloy cladding rate 8%) coated with a non-corrosive fluoride flux. (Load load: 324 g), heated to 605 ° C at a heating rate of 50 ° C / min, and held for 5 minutes. After cooling, the brazing cross section was observed, and those with small erosion at the crystal grain boundaries of the fin material were evaluated as good (marked with ⁇ ), and those with severe erosion and marked melting of the fin material were evaluated as defective (marked with X).
- the corrugated shape was as follows.
- Corrugated shape height 2.3 mm x width 21 mm x pitch 3.4 mm, 10 peaks
- the fin material according to the present invention has good tensile strength after brazing, erosion resistance, sag resistance, sacrificial anode effect, and self-corrosion resistance.
- Fin material No. 8 of the comparative example has a low Mn content and a low tensile strength after brazing.
- Fin material No. 9 of the comparative example a giant crystallized product was produced during the production with a large Mn content, and cracks occurred during cold rolling, so that a fin material could not be obtained.
- Fin material No. 10 of the comparative example has a low Si content and a low tensile strength after brazing.
- the fin material No. 11 of the comparative example had a large Si content and was inferior in erosion resistance.
- a giant crystallized product was formed during the production with a large Fe content, and cracks occurred during cold rolling, so that a fin material could not be obtained.
- Fin material No. 13 of the comparative example the Zn content was low, the spontaneous potential was noble, and the sacrificial anode effect was poor.
- Fin material No. 14 of the comparative example had a high Zn content, a high corrosion current density, and a poor self-corrosion resistance.
- the final Red was high and the tensile strength before brazing was high, so that fin molding was difficult.
- Fin material number 17 of the comparative example is intermediate The annealing temperature was low, the tensile strength before brazing was high, the sag amount was large, and the sag resistance was poor.
- the melted twin belt slabs having the compositions of alloy numbers 1 and 2 shown in Table 1 and obtained in Example 1 were divided, and the thickness of the intermediate annealed sheet was changed under the respective plate making conditions shown in Table 4.
- the steel sheet After cold rolling to a temperature of 100 ° C./sec in a continuous annealing furnace, the steel sheet was softened by intermediate annealing by water cooling without holding at 450 ° C. Next, the sheet was cold-rolled at a final cold rolling reduction shown in Table 4 to a thickness of 50 / m.
- the heating rate was 50 ° C./hour
- the temperature was maintained at each temperature shown in Table 4 for 2 hours
- the cooling rate was 50 ° C. / Hour (up to 100 ° C) for soft fining to obtain fin material.
- the tensile strength before brazing, tensile strength after brazing, crystal grain size after brazing, erosion resistance, sag resistance, sacrificial anode effect, and self-corrosion resistance were evaluated by the method shown in Example 1. Table 4 shows the results.
- the fin materials Nos. 21, 22, and 23 produced by the method of the present invention exhibited tensile strength after brazing, erosion resistance, sag resistance, sacrificial anode effect, and self-corrosion resistance. All are good.
- the fin materials 24, 25, and 26, in which the final cold rolling rate is high and the final annealing is not performed, of the comparative example have high tensile strength before brazing and are difficult to form, and the sag amount is large and the sag resistance is large. Inferior. Fin materials Nos.
- a heat exchange having an appropriate strength before brazing for easy fin molding, a high strength after brazing, and excellent sag resistance, erosion resistance, self-corrosion resistance, and sacrificial anode effect.
- a fin aluminum alloy fin material and a method for producing the same are provided.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CA2553910A CA2553910C (en) | 2004-02-03 | 2005-01-28 | High strength aluminum alloy fin material for heat exchanger and method for production thereof |
KR1020067017777A KR101162250B1 (ko) | 2004-02-03 | 2005-01-28 | 열교환기용 고강도 알루미늄 합금 핀재 및 그 제조방법 |
EP05704245.9A EP1717327B1 (en) | 2004-02-03 | 2005-01-28 | Method for producing a high strength aluminum alloy fin material for heat exchanger |
US10/587,568 US8142575B2 (en) | 2004-02-03 | 2005-01-28 | High strength aluminum alloy fin material for heat exchanger and method for production thereof |
US12/488,032 US8110051B2 (en) | 2004-02-03 | 2009-06-19 | High strength aluminum alloy fin material for heat exchanger and method for production thereof |
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JP2004026749A JP4725019B2 (ja) | 2004-02-03 | 2004-02-03 | 熱交換器用アルミニウム合金フィン材およびその製造方法並びにアルミニウム合金フィン材を備える熱交換器 |
JP2004-026749 | 2004-02-03 |
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US10/587,568 A-371-Of-International US8142575B2 (en) | 2004-02-03 | 2005-01-28 | High strength aluminum alloy fin material for heat exchanger and method for production thereof |
US12/488,032 Division US8110051B2 (en) | 2004-02-03 | 2009-06-19 | High strength aluminum alloy fin material for heat exchanger and method for production thereof |
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WO2005075691A1 true WO2005075691A1 (ja) | 2005-08-18 |
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PCT/JP2005/001195 WO2005075691A1 (ja) | 2004-02-03 | 2005-01-28 | 熱交換器用高強度アルミニウム合金フィン材およびその製造方法 |
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US (2) | US8142575B2 (ja) |
EP (1) | EP1717327B1 (ja) |
JP (1) | JP4725019B2 (ja) |
KR (1) | KR101162250B1 (ja) |
CN (1) | CN100436621C (ja) |
CA (1) | CA2553910C (ja) |
WO (1) | WO2005075691A1 (ja) |
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- 2005-01-28 CA CA2553910A patent/CA2553910C/en not_active Expired - Fee Related
- 2005-01-28 KR KR1020067017777A patent/KR101162250B1/ko active IP Right Grant
- 2005-01-28 EP EP05704245.9A patent/EP1717327B1/en not_active Ceased
- 2005-01-28 WO PCT/JP2005/001195 patent/WO2005075691A1/ja active Application Filing
- 2005-01-28 US US10/587,568 patent/US8142575B2/en not_active Expired - Fee Related
- 2005-01-28 CN CNB2005800038582A patent/CN100436621C/zh active Active
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2007013380A1 (en) * | 2005-07-27 | 2007-02-01 | Nippon Light Metal Company, Ltd. | High strength aluminum alloy fin material and method of production of same |
US7998288B2 (en) | 2005-07-27 | 2011-08-16 | Nippon Light Metal Company, Ltd. | High strength aluminum alloy fin material and method of production of same |
US8226781B2 (en) | 2005-07-27 | 2012-07-24 | Nippon Light Metal Company, Ltd. | High strength aluminum alloy fin material and method of production of same |
US8784582B2 (en) | 2005-07-27 | 2014-07-22 | Nippon Light Metal Company, Ltd. | High strength aluminum alloy fin material and method of production of same |
EP2551364B1 (en) | 2006-10-13 | 2016-05-04 | Gränges Sweden AB | High strength and sagging resistant fin material |
EP1918394B1 (en) | 2006-10-13 | 2016-12-28 | Gränges Sweden AB | High strength and sagging resistant fin material |
US10131970B2 (en) | 2006-10-13 | 2018-11-20 | Gränges Sweden Ab | High strength and sagging resistant fin material |
EP1918394B2 (en) † | 2006-10-13 | 2022-07-27 | Gränges Sweden AB | High strength and sagging resistant fin material |
EP2551364B2 (en) † | 2006-10-13 | 2022-08-24 | Gränges Sweden AB | High strength and sagging resistant fin material |
JP2019218617A (ja) * | 2018-06-21 | 2019-12-26 | 日本軽金属株式会社 | 耐座屈性に優れた熱交換器用アルミニウム合金フィン材及びその製造方法 |
WO2019244411A1 (ja) * | 2018-06-21 | 2019-12-26 | 日本軽金属株式会社 | 耐座屈性に優れた熱交換器用アルミニウム合金フィン材及びその製造方法 |
Also Published As
Publication number | Publication date |
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KR20060123608A (ko) | 2006-12-01 |
CA2553910C (en) | 2014-03-04 |
EP1717327A4 (en) | 2015-08-19 |
KR101162250B1 (ko) | 2012-07-05 |
EP1717327A1 (en) | 2006-11-02 |
JP2005220375A (ja) | 2005-08-18 |
US20070113936A1 (en) | 2007-05-24 |
EP1717327B1 (en) | 2019-05-01 |
CN100436621C (zh) | 2008-11-26 |
CN1914340A (zh) | 2007-02-14 |
CA2553910A1 (en) | 2005-08-18 |
US8110051B2 (en) | 2012-02-07 |
US8142575B2 (en) | 2012-03-27 |
US20090260726A1 (en) | 2009-10-22 |
JP4725019B2 (ja) | 2011-07-13 |
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