WO2016024696A1 - 열교환기 배관용 고강도 고내식성 알루미늄 합금, 이로부터 제조된 열교환기 배관 및 열교환기 배관의 제조방법 - Google Patents
열교환기 배관용 고강도 고내식성 알루미늄 합금, 이로부터 제조된 열교환기 배관 및 열교환기 배관의 제조방법 Download PDFInfo
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- WO2016024696A1 WO2016024696A1 PCT/KR2015/004256 KR2015004256W WO2016024696A1 WO 2016024696 A1 WO2016024696 A1 WO 2016024696A1 KR 2015004256 W KR2015004256 W KR 2015004256W WO 2016024696 A1 WO2016024696 A1 WO 2016024696A1
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- heat exchanger
- aluminum alloy
- intermetallic compound
- aluminum
- precipitates
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Classifications
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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
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- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- 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
Definitions
- the present invention relates to a high strength, high corrosion resistance aluminum alloy for heat exchanger piping, heat exchanger piping and heat exchanger piping produced therefrom. Specifically, not only satisfies all of the strength, corrosion resistance, and extrudability that is in conflict with the strength required for the heat exchanger pipe alloy, but also deformation of the alloy structure before and after high temperature heat treatment can be minimized or avoided, and manufacturing cost is reduced. It relates to an aluminum alloy, a heat exchanger pipe produced therefrom and a method for producing a heat exchanger pipe.
- the heat exchanger pipe is a component used in heat exchangers such as automobiles and home appliances, and is made of aluminum alloy in consideration of light weight, high strength, and thermal conductivity.
- the heat exchanger pipe made of the aluminum alloy is mounted on heat exchangers such as automobiles and other transportation equipments to enable high-efficiency heat exchange, thereby reducing fuel consumption or power consumption of household appliances.
- Pipes for heat exchangers are radiators, heater cores, oil coolers, and condensers and evaporators that use R134a as a vehicle, depending on the application.
- an aluminum alloy having excellent corrosion resistance as well as strength and extrusion property is required.
- 3000 series aluminum alloys such as conventionally used as a material of the heat exchanger pipe A13003 is excellent resist: has been known to exhibit characteristics.
- the 3000 : series aluminum alloy is actually manufactured as a heat exchanger pipe, in particular, after processing such as brazing at a high temperature of 450 ° C. or higher, the structure becomes considerably deformed as compared to the initial state.
- the minimum tensile strength of 90 MPa and the minimum yield strength of 30 MPa may not be satisfied, and the decrease in tensile strength and yield strength is more pronounced when manufactured with a thin heat exchanger pipe having a thickness of 0.5 mm or less.
- Japanese Patent Laid-Open No. 11-21649 discloses a method for producing an aluminum alloy and heat exchanger extruded pipe for stably producing an extruded molding material for heat exchanger having excellent corrosion resistance.
- the aluminum alloy is added in a somewhat excessive amount of various alloying elements, including copper (Cu) to improve the strength, thereby reducing the extrusion and corrosion resistance, hot cracking during casting, stress corrosion cracking (etc.) It may cause a problem of heat exchanger extruded pipe quality may be degraded.
- Korean Laid-Open Patent Publication No. 10-2011-0043221 discloses an aluminum alloy in which deformation of the alloy structure before and after heat treatment at high temperature can be minimized or avoided.
- the aluminum alloy frequently causes extrusion defects, which may significantly reduce productivity.
- the strength, corrosion resistance, and the extrudeability in the upper layer relationship can be simultaneously stratified. Especially, even when manufactured with a thin heat exchanger pipe having a thickness of 0.5 mm or less, the strength and corrosion resistance are excellent.
- an aluminum alloy for heat exchanger piping in which deformation of the alloy structure may be minimized or avoided before and after heat treatment at a high temperature to be manufactured to maintain its physical properties.
- An object of the present invention is to provide an aluminum alloy for heat exchanger piping and a heat exchanger piping manufactured therefrom which can simultaneously stratify extrudeability in conflict with strength, corrosion resistance and strength.
- the present invention provides an aluminum alloy for heat exchanger piping having a tensile strength of 100 MPa or more and corrosion resistance in a Sea Water Acetic Acid Test (SWAAT) of 1,000 hours or more even when manufactured by a thin heat exchanger pipe having a thickness of 0.5 mm or less. It aims to do it.
- SWAAT Sea Water Acetic Acid Test
- the present invention is a heat exchanger aluminum alloy for heat exchanger pipes and the like which can be minimized or avoided deformation of the alloy structure before and after heat treatment at a high temperature for producing a finished product such as: It is an object to provide heat exchanger piping. ;
- an object of this invention is to provide the manufacturing method of an exchanger piping which can manufacture the said heat exchanger piping easily, and can reduce manufacturing cost.
- iron 0.05 to 0.5 weight percent iron (Fe), 0.01 to 0.2 weight 93 ⁇ 4 silicon (Si), 0.6 to 1.2 weight manganese (Mn) and 0.15 to 0.45 weight 3 ⁇ 4 of copper (Cu), further comprising titanium (Ti), 0.01 to 0.1% by weight of one or more alloying elements selected from the group consisting of strontium (Sr), chromium (Cr), zirconium (Zr), and yttrium (Y), with the remainder being aluminum (A1) and unavoidable impurities Consisting of, aluminum alloy for heat exchanger piping.
- alloying elements selected from the group consisting of strontium (Sr), chromium (Cr), zirconium (Zr), and yttrium (Y), with the remainder being aluminum (A1) and unavoidable impurities Consisting of, aluminum alloy for heat exchanger piping.
- the precipitates having a deposit increase area of 2.0 2 or more, which are located at 24 or less per unit area of a circle having a diameter of 100, and adjacent to this based on any precipitate having an area of 2.0 2 or more, and having an area of 2.0 ⁇ M 2 or more.
- an aluminum alloy for heat exchanger piping characterized in that the average distance between the precipitates, which is the average of the distances from the ten precipitates, in the order of close proximity to the precipitates, is 21 to 40. .
- the precipitate includes an Al-Fe intermetallic compound, Al-Cu intermetallic compound or Al-Fe-Mn intermetallic compound, Al-Ti intermetallic compound, Al-Sr intermetallic compound, A ⁇ Cr intermetallic
- an aluminum alloy for heat exchanger piping further comprising at least one intermetallic compound selected from the group consisting of a compound, an A Zr intermetallic compound and an AY intermetallic compound.
- the aluminum alloy for heat exchanger piping provided with the grain average particle diameter of 50 im or less is provided.
- a heat exchanger pipe made of an aluminum alloy the precipitate of the aluminum alloy has an area of 2.0 pm 2 or more, the presence of 24 or less per unit area of a circle of 100 diameter, the area of the precipitate of the aluminum alloy is 2.0 2
- Heat exchanger having an average distance of 21 to 40, which is the average of the distances from the 10 precipitates, in the order of the closest distances to the precipitates, among other precipitates adjacent to the child and having an area of 2.0 urn 2 or more based on the above-mentioned arbitrary precipitates.
- the precipitate includes an AHFe intermetallic compound, Al-Cu intermetallic compound or A1-Fe-Mn intermetallic compound, Al-Ti intermetallic compound, Al-Sr intermetallic compound, Al-Cr intermetallic compound,
- a heat exchanger piping further comprising at least one intermetallic compound selected from the group consisting of A 'Zr intermetallic compound and A1-Y intermetallic compound.
- the average grain size of the aluminum alloy is 50 or less, brazing; In the case of heat treatment, the grain size average grain size of the aluminum alloy is controlled to be 70 im or less.
- the tensile strength is not less than 100 MPa, characterized in that the corrosion resistance in the SWAAT test according to ASTM G85 is more than 1,000 hours, to provide a heat exchanger pipe. Furthermore, it provides a heat exchanger pipe, characterized in that the thickness is 0.1 to 0.5 mm. :
- the present invention also provides a heat exchanger pipe, characterized in that the surface is treated with a thermal arc spray (TAS). :
- a short aluminum wire rod that manufactures wire rods or aluminum billets is heat treated at 450 ° to 650 ° C. for 10-25 hours or the aluminum billet is 20 ° at 520 to 620 ° C.
- a method of manufacturing a heat exchanger pipe Provided, a method of manufacturing a heat exchanger pipe.
- the confirm extrusion or direct extrusion step further comprising the step of thermal spray spray (TAS, thermal arc spray) on the surface of the heat exchanger pipe, it provides a method for producing a heat exchanger pipe.
- TAS thermal spray spray
- the aluminum alloy molten metal is characterized in that the temperature of 750 to 900 ° C, provides a method for producing a heat exchanger pipe.
- the aluminum alloy for heat exchanger piping according to the present invention can simultaneously stratify the extruded property which is in conflict with the strength, corrosion resistance and strength with an optimal combination of alloying elements and precisely controlled mixing ratio, and has a thickness of 0.5 mm or less. Even when the heat exchanger tube is manufactured, the tensile strength of 100 MPa or more and the SWAAT (Sea Water Acetic Acid Test) and the corrosion resistance: 1,000 hours or more are excellent.
- the heat exchanger pipe manufactured from the aluminum alloy for heat exchanger pipe according to the present invention further improves the corrosion resistance through precise homogeneity control of the size and distribution of precipitates such as grain refinement and intermetallic compounds, and heat exchange. It is an excellent effect that the deformation of the alloy structure is minimized or avoided before and after the heat treatment at high temperature for the production of finished products such as steel.
- the manufacturing method of the heat exchanger pipe according to the present invention can be produced simply and simply as compared to the conventional method, thereby exhibiting an excellent effect of lowering the manufacturing cost of the heat exchanger pipe.
- FIG. 1 schematically illustrates an embodiment of a heat exchanger pipe manufactured by a manufacturing process according to an embodiment of the present invention.
- FIG. 2 is a flowchart of a process of manufacturing a heat exchanger pipe from an aluminum alloy according to an embodiment of the present invention.
- Figure 5 shows the distribution of precipitates before and after heat treatment of each of the heat exchanger pipe of Example 12 and Comparative Example 11 according to the present invention.
- the present invention relates to a high strength and high corrosion resistance aluminum alloy for heat exchanger piping.
- the aluminum alloy comprises iron (Fe), silicon (Si), manganese (Mn) and alloying elements of copper (Cu) and titanium (Ti), with the remainder being made of aluminum (A1) and other unavoidable impurities.
- the alloy element iron (Fe) is present as an Al—Fe intermetallic compound in the matrix.
- alloying elements such as manganese (Mn) and silicon (Si) ⁇ copper (Cu)
- Mn manganese
- Si silicon
- Cu copper
- Al-Mn-Fe, Al-Mn-Fe-Si, Al-Fe-Cu do.
- the A ⁇ Fe-based intermetallic compound is mostly precipitated during the heat treatment during the manufacturing of the heat exchanger pipe from the aluminum alloy to suppress grain growth, that is, through refinement of the grain, thereby improving mechanical strength such as tensile strength of the heat exchanger pipe. In addition, it prevents or minimizes the decrease in mechanical strength such as tensile strength when brazing the aluminum pipe for the manufacture of heat exchanger.
- the content of the iron (Fe), which is a straight chain, may preferably be 0.05 wt% to 0.5 wt%, and more preferably 0.15 wt% to 0.35 wt%.
- the effect of improving mechanical strength such as grain refinement and tensile strength may be insignificant, whereas when the content of the iron (Fe) is more than 0.5J% by weight, the intermetallic compound is coarse to form the aluminum alloy. Corrosion resistance and extrusion resistance can be greatly reduced at the same time.
- Silicon (Si) in the alloying element forms a compound such as aluminum (A1), iron (Fe), manganese (Mn) and the like by extrusion: by refining various recrystallization i formed in the process, consequently at the extrusion processing temperature of the aluminum alloy By reducing the resistance of the aluminum alloy serves to improve the extrudability.
- the Al-Fe-Si-based metal complexes may be used for brazing joints of aluminum pipes for the manufacture of heat exchangers; It inhibits grain coarsening by interfering with grain boundary movement, thereby preventing or minimizing mechanical strength such as tensile strength of aluminum pipe.
- the content of silicon (Si) may be preferably 0.01 to 0.2% by weight.
- the high capacity of manganese (Mn) or the like may be reduced, thereby greatly reducing the economic efficiency of the aluminum ingot made from the aluminum alloy, while exceeding 0.2% by weight>. In the case of corrosion resistance and extrusion resistance of the aluminum alloy can be greatly reduced at the same time.
- Manganese (Mn) among the alloying elements is an alloying element that contributes to the corrosion resistance of the aluminum alloy, it is distributed in the form of a fine intermetallic compound of Al 6 Mn in the aluminum state to increase the corrosion potential of aluminum as well as a certain level of strength Positive impact on improvement.
- the content of manganese (Mn) may be preferably 0.6 to 1.2% by weight.
- the degree of improvement of the corrosion resistance of the aluminum alloy may be unevenly divided, whereas when the content of more than 1.2% by weight does not change significantly the degree of improvement of the aluminum alloy and the corrosion resistance.
- the productivity with the aluminum alloy can be significantly lowered.
- the content of copper (Cu) may be preferably 0.15 to 0.45% by weight.
- the copper (Cu) content is 0.15% by weight, the tensile strength and the corrosion resistance of the aluminum alloy may be unsatisfactory, whereas when the content of the copper (Cu) is more than 0.45% by weight, the extrudability and the corrosion resistance may be due to coarsening of the intermetallic compound. At the same time, it can be greatly reduced.
- Titanium (Ti) as the alloying element has a melting point to 1,800 ° C melting point of the other alloying elements of iron (Fe): due to 1,540 ° C, the melting point of copper (Cu) is high compared to 1,084.5 ° C aluminum-titanium diborane fluoride (AlTiB 2 It is added in the form of a rod, etc., and is uniformly present in the aluminum alloy as fine precipitates in the form of Al—Ti intermetallic compounds such as Al—Al 3 Ti—TiB 2 . ⁇
- the Al—Ti intermetallic compound further reduces the distance between precipitates that determine the size of the grains of the aluminum alloy, and consequently further improves mechanical strength such as tensile strength of the aluminum alloy by miniaturization of grains. To act. By reducing the distance between these precipitates, the average diameter of the grains can be controlled to about 10 to 40;
- Titanium (Ti) -added aluminum alloys can refine the grains by Al-Ti precipitates as described above, so that even when heat treatment is performed at a higher temperature or for a longer time to improve the elongation of the aluminum alloy
- the degree of decrease in tensile strength is higher than that of aluminum alloy without titanium (Ti). Since it is very low, the elongation can be greatly improved compared to the elongation of aluminum alloy without adding titanium (Ti) and showing the same tensile strength. This makes it possible to suppress preferential corrosion of the machining portion.
- the titanium (TO content is preferably 0.01 to 0.3% by weight, more preferably 0.01 to 0.1% by weight.
- the content of the titanium (Ti) is less than 0.01% by weight, the effect of grain refining and thereby While the degree of improvement in mechanical strength, such as tensile strength, of the aluminum alloy is insufficient,
- Extrusion property of the aluminum alloy may be greatly lowered by the two-conversation of the intermetallic compound when it is greater than 0: 3% by weight.
- the titanium (Ti) may be replaced with strontium (Sr), chromium (Cr), zirconium (Zr), yttrium (Y) and the like.
- the aluminum alloy according to the present invention can simultaneously satisfy the tensile strength, the corrosion resistance, and the extrudeability in the upper layer relationship with the tensile strength. .
- the present invention relates to heat exchanger piping of high strength and high corrosion resistance.
- FIG. 1 schematically illustrates an embodiment of a heat exchanger pipe according to the present invention.
- the heat exchanger pipe 40 may have a structure in which one or more flow paths 41 through which a refrigerant moves are merged.
- the heat exchanger pipe 40 has an average grain size of about 50 or less of the aluminum alloy constituting the heat exchanger pipe 40, and may be controlled to have a grain average particle size of about 70 or less even when brazing heat treatment is performed to manufacture the heat exchanger.
- the heat exchanger pipe 40 has excellent tensile strength and corrosion resistance through grain refinement of the aluminum alloy constituting the same, and in particular, even when made of a thin heat exchanger tube having a thickness of 0.5 mm or less, the tensile strength is 100 MPa. Above, preferably 110 MPa or more, the corrosion resistance in SWAAT (Sea Water Acetic Acid Test) according to ASTM G85 can exhibit a very excellent effect of 1,000 hours or more.
- SWAAT Sea Water Acetic Acid Test
- the heat exchanger pipe 40 may be damaged by the pressure of the heat inductor operation evaporator when the thickness is less than 0.1 mm, while the heat exchanger efficiency may decrease or the weight of the heat exchanger may increase when the thickness exceeds 0.5 mm. It may be difficult to finish post-expansion such as expansion pipe, shaft pipe and bending.
- the heat exchanger pipe 40 is made of a thin pipe having a thickness of 0.5 mm or less due to the miniaturization of the grains of the aluminum alloy forming it, the decrease in elongation is avoided or minimized, so that expansion, bending of the tube, and post-processing are easy, After post-processing, it is possible to suppress preferential corrosion of the machining site.
- the heat exchanger pipe 40 is any precipitate having an area of 2.0 ⁇ 2 or more of precipitates of the aluminum alloy constituting the same is present in 24 or less per unit area of a circle having a diameter of 100, and any area of 2.0 2 or more after heat treatment
- the average distance between the precipitates which is the average of the distances from the 10 precipitates, in the order of close proximity to any of the other precipitates adjacent thereto and having an area of 2.0 urn 2 or more, may be 21 to 40 / ⁇ .
- more than 24 precipitates with an area of 2.0! M 2 or more per unit area of a circle having a diameter of 100 mm2 and more than 24 and the average distance between the precipitates are less than 21 ⁇ , and a plurality of precipitates having an area of 2.0! M 2 or more are adjacently distributed.
- the disappearance part due to the corrosion reaction proceeding from each of the precipitates and the disappearance part due to the corrosion reaction proceeding from other adjacent precipitates may be connected to each other, so that the entire disappearance portion due to the corrosion may increase rapidly.
- a phenomenon in which even a portion that does not need to be lost due to corrosion may occur due to the above-described coupling action, and thus the total loss area may be greatly enlarged.
- the precipitate may include A ⁇ Fe intermetallic compound, A1 ⁇ Cu intermetallic compound, Al-Fe-Mn intermetallic compound, Al-Ti intermetallic compound, Al-Sr intermetallic compound, A Cr It may further include an intermetallic compound, an Al-Zr intermetallic compound, an A1-Y intermetallic compound, and the like.
- the heat exchanger pipe 40 according to the present invention further improves the corrosion resistance through precise control of the size and distribution of the precipitates of the aluminum alloy constituting the same, and the brazing for manufacturing the finished heat exchanger ( Brazing) Before and after the heat treatment, deformation of the alloy structure is minimized or avoided, which shows an excellent effect of maintaining its physical properties.
- Figure 2 is a flow diagram of a process for producing a heat exchanger pipe from a blue aluminum alloy in one embodiment of the present invention.
- the manufacturing process of the aluminum alloy and aluminum pipe may include the following steps a) to e):
- the method of manufacturing a heat exchanger pipe according to an embodiment of the present invention may further include a step of degassing the aluminum alloy melt and filtering foreign matter after step a).
- the degasification and foreign matter filtration step is preferably performed between step a) and step b). This is because the Al-Ti intermetallic compound may be degassed together with the gas when the degassing and the foreign matter filtration step are performed after step b).
- step b) the Al-Ti precipitates from the added Al-Ti-B alloy are uniformly distributed in the matrix, thereby reducing the distance between the precipitates that determine the grain size, resulting in As a result, the mechanical strength such as tensile strength of the aluminum alloy may be improved by grain refinement. As a result, in the method of manufacturing the heat exchanger pipe according to the present invention, a separate grain refining process is unnecessary, so that the weeding process is simple and thus the manufacturing cost can be reduced.
- the temperature of the aluminum alloy molten metal applied to the continuous casting rolling in step c) is 750 to 900 ° C.
- the reason for limiting the injection temperature of the molten metal applied to the continuous casting rolling as described above is to obtain a solid solution which is an intermetallic compound, that is, a casting having a dense microstructure.
- Run phenomenon may occur.
- the diameter of the aluminum wire rod manufactured by the continuous casting rolling in step c) may be different according to the specification of the heat exchanger pipe manufactured therefrom, for example, may be 8 to 15mm.
- the conform extrusion can be replaced by direct extrusion.
- the aluminum wire rod instead of manufacturing the aluminum wire rod from the aluminum alloy molten metal by the continuous casting rolling method, it is in the form of an aluminum billet by the continuous casting method or the like. It can be prepared as.
- the aluminum billet may be hollowed out after homogenization heat treatment for 20 hours to 40 hours at: 520 to 620 ° C., and the heat extruded by direct extrusion after preheating the blanked aluminum billet at 350 ° C. to 550 ° C. after heat treatment. Can be manufactured.
- the aluminum billets made from the aluminum alloy are discontinuously introduced into the extruder to produce the heat exchanger pipe.
- the heat energy applied to the aluminum billet during the direct extrusion and the shear energy due to the extrusion are determined in the form of a solid solution of manganese (Mn), Alloying elements such as copper (Cu) and intermetallic compounds are diffused to a certain amount of grain boundaries to precipitate.
- the step d) is to achieve the uniformity of the alloying elements forming the aluminum alloy or removal of non-uniform structure such as segregation through heat treatment of the aluminum wire rod, as a result of the uniformity and partial corrosion of the physical properties of the aluminum alloy and The grain boundary corrosion can be suppressed.
- the extrusion speed during the conform extrusion of step e) may be preferably about 100 mpm.
- the conform extrusion is an extrusion method that uses shear stress, and requires a certain level of extrusion speed, and when the extrusion speed is low, surface defects or deterioration of physical properties of the manufactured pipe may be caused.
- the manufacturing process of the heat exchanger pipe according to an embodiment of the present invention has extreme corrosion resistance to the heat exchanger pipe ; If necessary, after performing step e), the method may further include performing a thermal arc spray (TAS) treatment on the surface of the heat exchanger pipe.
- the zinc thermal spray (TAS) treatment may impart a regenerative anode effect to further improve the corrosion resistance of the heat exchanger pipe.
- An aluminum wire rod was produced by continuous casting rolling from each aluminum alloy (750-900 ° C.) containing alloy elements of the contents as shown in Table 1 below, and the remaining amount is composed of aluminum and other unavoidable impurities. Wound in the form of bobbins.
- Examples 1 to 11 and Comparative Examples 1 to 6, 8, and 9 are obtained by adding an A1-T B alloy to an aluminum alloy molten metal immediately before continuous casting rolling.
- Comparative Example 10 A1-Ti-B alloy was added simultaneously with other alloying elements.
- the heat treatment was performed in order of air cooling after maintaining for 18 hours at a temperature range of 52CTC for homogenization treatment of the respective ⁇ aluminum wire rod. Thereafter, the heat-treated wire rod was subjected to extrusion extrusion at 100 mpm using conform extrusion.
- Aluminum pipes with an outer diameter of 7 mm and a thickness of 0.5 mm were produced, respectively. Here, each aluminum pipe was blazed for 20 minutes at 6KTC for corrosion resistance evaluation.
- a heat exchanger tube made of aluminum alloy having a size and distribution of precipitates as shown in Table 2 was prepared as a heat exchanger tube blazed for 20 minutes at 61 CTC.
- the corrosion resistance was evaluated by the SWAAT test according to ASTM G85. Specifically, glacial acetic acid was added to 4.2 wt% NaCl solution to maintain pH 2.8 to 3.0 and sprayed onto the pipe specimens at 49 ° C at a pressure of 0.07 MPa and a spraying amount of 1-2 m ⁇ / hr. The maximum time to endure was measured. The evaluation results are shown in Tables 1 and 2 below.
- Example 1 0.30 0.30 0.90 0.10 0.1----121 1200 Good
- Example 2 0.50 0.30 0.90 0.10 0.1 ⁇ ---126 1020 Good
- Example 3 0.30 0.45 0.90 0.10 0.1----124 1140 Good
- Example 4 0.05 0.30 0.90 0.10 0.1 ⁇ ⁇ -111 1080 Good
- Example 5 0.30 0.15 0.90 0.10 0.1 ' - ⁇ ---115 1020 Good
- Example 6 0.30 0.30 1.2 0.10 0.1. ----124 1200
- Example 7 0.30 0.30 0.60 0.10 0.1 ⁇ -- ⁇ 114 1080 Good
- Example 8 0.30 0.30 0.90 0.10-0.1-- ⁇ 125 1080 Good
- Example 9 0.30 0.30 0.90 0.1 0--0.1-124 1048 Good
- Example 10 0.30 0.30 0.90 0.10- ⁇ ⁇ 0.1-124 1124 Good
- Bargyo Example 1 which contains a very small amount of iron (Fe) in the alloying elements, has a negligible grain refinement effect, resulting in inadequate tensile strength, whereas Comparative Example 2, in which the content of iron (Fe) is excessive, is relatively low. It was confirmed that the extrusion property and the corrosion resistance were greatly reduced at the same time.
- Comparative Example 3 having a very small amount of copper (Cu) in the alloying elements was inadequate in tensile strength and corrosion resistance, whereas Comparative Example 4 in which the copper (Cu) content was excessively confirmed was significantly reduced in corrosion resistance. It became.
- Comparative Example 5 having an extremely small content of alloy element-manganese manganese (Mn) was significantly inferior in corrosion resistance, whereas Comparative Example 9 having an excessively high content of manganese (Mn) was found to have greatly reduced extrudability.
- Comparative Example 10 in which titanium (TO is added in an appropriate amount: Al-Ti-B alloy is added at the same time as addition of other alloying elements other than immediately before casting, as shown in FIGS. 3 and 4, the grains are excessive after the heat treatment. It was confirmed that the corrosion resistance was greatly reduced by the expansion.
- the aluminum pipes of Examples 12 and 13 according to the present invention can simultaneously achieve high tensile strength of 100 MPa or more and excellent corrosion resistance of 1,000 hours or more upon SWAAT evaluation even after heat treatment.
- the aluminum alloy constituting the heat exchanger pipe of Example 12 has 24 or less precipitates having a size of 20 m 2 or more after thermal treatment. On average, they are spaced apart from each other by 21 to 40 kPa, further improving corrosion resistance.
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KR20140105212 | 2014-08-13 | ||
KR10-2014-0105212 | 2014-08-13 | ||
KR1020150056349A KR101594729B1 (ko) | 2014-08-13 | 2015-04-22 | 열교환기 배관용 고강도 고내식성 알루미늄 합금 및 이로부터 제조된 열교환기 배관 |
KR10-2015-0056352 | 2015-04-22 | ||
KR10-2015-0056349 | 2015-04-22 | ||
KR1020150056352A KR101650653B1 (ko) | 2014-08-13 | 2015-04-22 | 고강도 및 고내식성의 열교환기 배관 및 이의 제조방법 |
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JP2001207231A (ja) * | 2000-01-21 | 2001-07-31 | Mitsubishi Alum Co Ltd | 高温強度に優れた熱交換器用Al合金押出材 |
JP2004232003A (ja) * | 2003-01-29 | 2004-08-19 | Furukawa Sky Kk | 耐食性に優れたアルミニウム合金ブレージングシート |
JP2009174052A (ja) * | 2007-12-26 | 2009-08-06 | Aisin Keikinzoku Co Ltd | 熱交換器用アルミニウム合金 |
KR20110043221A (ko) * | 2009-10-21 | 2011-04-27 | 엘에스전선 주식회사 | 열교환기 튜브용 고내식성 알루미늄 합금 및 이를 이용한 열교환기 튜브의 제조방법 |
KR20110072237A (ko) * | 2009-12-22 | 2011-06-29 | 엘에스전선 주식회사 | 열교환기 튜브용 고내식성 알루미늄 합금 및 이를 이용한 열교환기 튜브의 제조방법 |
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