KR20110043221A - Aluminum alloy with high corrosion resistance for heat exchanger tube and method for manufactured of heat exchanger tube using thereof - Google Patents

Aluminum alloy with high corrosion resistance for heat exchanger tube and method for manufactured of heat exchanger tube using thereof Download PDF

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KR20110043221A
KR20110043221A KR1020090100246A KR20090100246A KR20110043221A KR 20110043221 A KR20110043221 A KR 20110043221A KR 1020090100246 A KR1020090100246 A KR 1020090100246A KR 20090100246 A KR20090100246 A KR 20090100246A KR 20110043221 A KR20110043221 A KR 20110043221A
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heat exchanger
exchanger tube
aluminum alloy
corrosion resistance
aluminum
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KR101594625B1 (en
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박재성
윤종서
최웅철
남태흠
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엘에스전선 주식회사
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/08Making wire, bars, tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/003Aluminium alloys
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04Casting aluminium or magnesium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C4/00Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06Metallic material
    • C23C4/08Metallic material containing only metal elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081Heat exchange elements made from metals or metal alloys
    • F28F21/084Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C2202/00Physical properties

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Extrusion Of Metal (AREA)

Abstract

PURPOSE: Aluminum alloy with high corrosion resistance for a heat exchange tube and a method of manufacturing the heat exchange tube using the same are provided to enable the heat exchange tube to be used for a long time without pitting under various corrosive conditions since extrusion and corrosion resistance performances are enhanced. CONSTITUTION: Aluminum alloy with high corrosion resistance for a heat exchange tube consists of Fe(Iron) of 0.05~0.5wt.%, Si(Silicon) of 0.05~0.2wt.%, Mn(Manganese) of 0.6~1.2wt.%, Cu(Copper) of 0.15~0.45wt.%, aluminum, and inevitable impurities. A method of manufacturing the heat exchange tube comprises a continuous casting step(S101) and an extruding step(S201).

Description

열교환기 튜브용 고내식성 알루미늄 합금 및 이를 이용한 열교환기 튜브의 제조방법{Aluminum alloy with high corrosion resistance for heat exchanger tube and Method for manufactured of heat exchanger tube using thereof}Aluminum alloy with high corrosion resistance for heat exchanger tube and Method for manufactured of heat exchanger tube using

본 발명은 열교환기 튜브용 고내식성 알루미늄 합금 및 제조방법에 관한 것으로서, 보다 상세하게는 알루미늄 합금의 조성을 개선하여 열교환기 튜브 제조에 적합한 내식성이 우수한 알루미늄 합금 및 이를 이용한 열교환기 튜브의 제조방법에 관한 것이다.The present invention relates to a highly corrosion-resistant aluminum alloy for a heat exchanger tube and a manufacturing method, and more particularly to an aluminum alloy excellent in corrosion resistance suitable for manufacturing a heat exchanger tube by improving the composition of the aluminum alloy and a method for producing a heat exchanger tube using the same. will be.

열교환기용 튜브는 자동차의 열교환기에 사용되는 부품으로서, 경량성, 고강도 및 열전도 특성이 고려된 알루미늄 합금 재질로 제작된다. 이러한 알루미늄 합금으로 이루어진 열교환기용 튜브는 자동차를 포함하는 수송 기기의 열교환기에 장착되어 고효율의 열교환이 가능하도록 하여 수송 기기의 연비 절감을 꾀할 수 있도록 한다.Heat exchanger tube is a component used in heat exchangers of automobiles, and is made of aluminum alloy material in consideration of light weight, high strength and thermal conductivity. The heat exchanger tube made of such an aluminum alloy is mounted on the heat exchanger of a transport device including a vehicle to enable high efficiency heat exchange, thereby reducing fuel economy of the transport device.

열교환기용 튜브는 용도에 따라 냉각수를 냉매로 사용하는 자동차의 라디에이터(Radiator), 히터 코어(Heater core), 오일 쿨러(Oil-cooler) 및 R134a를 냉매로 사용하는 응축기(Condensor), 증발기(Evaporator) 등에 사용된다. 이러한 열교 환기용 튜브는 냉매와 직접적인 접촉이 이루어지기 때문에 강도나 압출성은 물론이고 내식성이 우수한 알루미늄 합금이 필요하다.The heat exchanger tube is a radiator, heater core, oil cooler, and condenser and evaporator using R134a as a refrigerant in automobiles, depending on the application. Used for Since the heat exchanger tube is in direct contact with the refrigerant, an aluminum alloy having excellent corrosion resistance as well as strength and extrusion property is required.

일본특개평 11-21649 호는 철을 0.15 내지 0.35wt.%, 규소를 0.15wt.% 이하, 아연을 0.03wt.% 미만, 구리를 0.55wt.%, 지르코늄을 0.02 내지 0.05wt.% 미만, 티타늄을 0.003 내지 0.010wt.% 함유하고, 철/규소≥2.5 이고, 나머지가 알루미늄과 불가피하게 첨가되는 불순물로 이루어지는 알루미늄 합금을 제안한다.Japanese Patent Laid-Open No. 11-21649 discloses 0.15 to 0.35 wt.% Iron, 0.15 wt.% Or less silicon, less than 0.03 wt.% Zinc, 0.55 wt.% Copper, and 0.02 to 0.05 wt.% Zirconium, An aluminum alloy containing 0.003 to 0.010 wt.% Titanium, iron / silicon ≧ 2.5, and the remainder of which is inevitably added with aluminum is proposed.

그러나, 상기 '21649호의 특허에 따른 알루미늄 합금은 합금의 내식 특성을 확보하기 위한 첨가원소로 구리와 아연을 첨가하였으나, 구리의 첨가량이 많아 Al-Cu계 금속간 화합물이 다수 형성되어 압출 특성이 저하되고, 모재의 부식전위를 낮추게 되어 내식 특성이 열화되는 문제점이 있다. 또한, 아연의 경우 주조시 고온균열(hot cracking)을 발생시키고, 응력부식균열(stress corrosion cracking)을 유발시켜 제품의 제조특성 및 품질이 열화되는 문제점이 있다.However, in the aluminum alloy according to the '21649 patent, copper and zinc were added as an additive element to secure corrosion resistance of the alloy, but a large amount of copper was added, resulting in the formation of a large number of Al-Cu-based intermetallic compounds, which reduced extrusion characteristics. In addition, the corrosion potential of the base material is lowered, and there is a problem that the corrosion resistance is deteriorated. In addition, in the case of zinc, there is a problem in that hot cracking occurs during casting and stress corrosion cracking causes deterioration of manufacturing characteristics and quality of the product.

본 발명은 상술한 바와 같은 종래기술의 문제점을 해결하기 위하여 창안된 것으로서, 알루미늄 합금의 조성을 개선하여 압출성이 우수하면서도 여러 부식환경 하에서 우수한 내식성을 갖는 열교환기 튜브용 알루미늄 합금 및 이를 이용한 열교환기 튜브의 제조방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the problems of the prior art as described above, by improving the composition of the aluminum alloy aluminum alloy for heat exchanger tube having excellent extrusion resistance and excellent corrosion resistance under various corrosion environments and heat exchanger tube using the same Its purpose is to provide a method of manufacturing.

상기 기술적 과제를 달성하기 위한 본 발명에 따른 열교환기 튜브용 고내식성 알루미늄 합금은, 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 것을 특징으로 한다.Highly corrosion-resistant aluminum alloy for heat exchanger tube according to the present invention for achieving the above technical problem, 0.05 to 0.5wt.% Of iron, 0.05 to 0.2wt.% Of silicon, 0.6 to 1.2wt.% Of manganese and , 0.15 to 0.45 wt.% Copper, and the balance is made of aluminum and inevitable impurities.

상기 기술적 과제를 달성하기 위한 본 발명의 일 측면에 따른 열교환기 튜브의 제조방법은, 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 알루미늄 합금을, (a) 합금 용탕의 상태로 주입하고, 연속주조(continuous casting)를 통해 빌렛(billet)을 형성하는 단계; (b) 상기 빌렛을 300 내지 500℃의 온도 범위에서 예열 후, 압출 온도 300 내지 500℃에서 압출하여 열교환기 튜브를 형성하는 단계;를 포함하는 것을 특징으로 한다.Method for producing a heat exchanger tube according to an aspect of the present invention for achieving the above technical problem, 0.05 to 0.5wt.% Of iron, 0.05 to 0.2wt.% Of silicon, 0.6 to 1.2wt.% Of manganese And an aluminum alloy containing 0.15 to 0.45 wt.% Of copper, the balance being aluminum and unavoidable impurities in the state of (a) molten alloy, and billeting through continuous casting. Forming; (b) after preheating the billet at a temperature in the range of 300 to 500 ° C., extruding at an extrusion temperature of 300 to 500 ° C. to form a heat exchanger tube.

상기 기술적 과제를 달성하기 위한 본 발명의 다른 측면에 따른 열교환기 튜브의 제조방법은, 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내 지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 알루미늄 합금을, (a) 합금 용탕의 상태로 주입하고, 연속주조압연(properzi)을 통해 와이어 로드를 형성하는 단계; (b) 상기 와이어 로드를 450 내지 650℃의 온도 범위에서 10 내지 25 시간 동안 열처리하는 단계; 및 (c) 상기 열처리된 와이어 로드를 컨펌 압출을 통해 열교환기 튜브를 형성하는 단계;를 포함하는 것을 특징으로 한다.Method for producing a heat exchanger tube according to another aspect of the present invention for achieving the above technical problem, 0.05 to 0.5wt.% Of iron, 0.05 to 0.2wt.% Of silicon, 0.6 to 1.2wt.% Of An aluminum alloy containing manganese and 0.15 to 0.45 wt.% Copper, the balance being made of aluminum and unavoidable impurities, is injected (a) in the form of molten alloy, and the wire rod is formed through continuous casting rolling. Making; (b) heat treating the wire rod for 10 to 25 hours in a temperature range of 450 to 650 ° C .; And (c) forming a heat exchanger tube through conformal extrusion of the heat treated wire rod.

본 발명에 있어서, 상기 합금 용탕의 주입 온도는 750 내지 900℃의 온도 범위이다.In the present invention, the injection temperature of the molten alloy is a temperature range of 750 to 900 ℃.

본 발명에 있어서, 상기 제조된 열교환기 튜브 표면을 아연 용사(TAS, thermal arc spray) 처리하는 단계;를 더 포함할 수 있다.In the present invention, the heat exchanger tube surface prepared by thermal spraying (TAS, thermal arc spray) treatment; may further include a.

본 발명에 따르면, 열교환기 튜브에 사용되는 알루미늄 합금의 조성을 개선함으로써, 다른 물리적 특성에 영향을 미치지 않으면서도 내식성을 향상시킬 수 있고, 아연 용사 공정을 생략하더라도 충분한 내식성을 확보할 수 있어 공정의 단순화로 제품의 제조 효율과 생산성을 높일 수 있다.According to the present invention, by improving the composition of the aluminum alloy used in the heat exchanger tube, the corrosion resistance can be improved without affecting other physical properties, and even if the zinc spraying step is omitted, sufficient corrosion resistance can be secured, thereby simplifying the process. This can increase the manufacturing efficiency and productivity of the product.

이하 첨부된 도면을 참조로 본 발명의 바람직한 실시예를 상세히 설명하기로 한다. 이에 앞서, 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙 에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일 실시예에 불과할 뿐이고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

본 발명에 따른 열교환기 튜브용 고내식성 알루미늄 합금은 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진다.The highly corrosion-resistant aluminum alloy for heat exchanger tubes according to the invention comprises 0.05 to 0.5 wt.% Of iron, 0.05 to 0.2 wt.% Of silicon, 0.6 to 1.2 wt.% Of manganese, and 0.15 to 0.45 wt.% Of It contains copper and the balance consists of aluminum and inevitable impurities.

상기 철은 전이 원소로서 기호 Fe, 원자번호 26, 원자량 55.847, 비중 7.86, 융점 1540℃ 및 비점 2750℃의 특성이 있으며, 알루미늄 합금의 전체 중량 대비로 0.05 내지 0.5wt.%의 함량으로 포함되는 것이 바람직하다. The iron has a characteristic of the symbol Fe, atomic number 26, atomic weight 55.847, specific gravity 7.86, melting point 1540 ℃ and boiling point 2750 ℃ as a transition element, it is contained in an amount of 0.05 to 0.5wt.% Relative to the total weight of the aluminum alloy. desirable.

상기 철은 기지(Matrix) 내에 Al-Fe 금속간 화합물로서 존재한다. 또한, 망간 또는 망간, 규소가 공존하는 경우 Al-Mn-Fe 금속간 화합물 또는 Al-Mn-Fe-Si 금속간 화합물로서 정출 또는 석출하여 브레이징(brazing) 후의 강도를 향상시키며, 이 금속간 화합물은 결정립 조대화를 억제하는 작용을 한다.The iron is present as an Al-Fe intermetallic compound in the matrix. In addition, when manganese, manganese, or silicon coexist, crystallization or precipitation as Al-Mn-Fe intermetallic compound or Al-Mn-Fe-Si intermetallic compound improves the strength after brazing. It acts to suppress grain coarsening.

상기 철의 함량 한정에 있어서, 그 함량이 0.05wt.% 미만일 경우에는 강도 향상 등 철을 첨가한 효과가 나타나기 어려워 바람직하지 않으며, 그 함량이 0.5wt.%를 초과할 경우에는 압출성과 내식성이 동시에 저하되기 때문에 바람직하지 않다.In the iron content limitation, when the content is less than 0.05wt.%, It is not preferable because the effect of adding iron, such as improving the strength is not preferable, and when the content is more than 0.5wt.%, Extrudability and corrosion resistance at the same time It is not preferable because it is lowered.

상기 규소는 비금속 원소로서 기호 Si, 원자번호 14, 원자량 28.086, 비중 2.32, 융점 1410℃ 및 비점 2335℃의 특성이 있으며, 알루미늄 합금의 전체 중량 대비로 0.05 내지 0.2wt.%의 함량으로 포함되는 것이 바람직하다. The silicon has a characteristic of the symbol Si, atomic number 14, atomic weight 28.086, specific gravity 2.32, melting point 1410 ° C and boiling point 2335 ° C as a nonmetallic element, and it is included in an amount of 0.05 to 0.2wt.% Based on the total weight of the aluminum alloy. desirable.

상기 규소는 압출 가공 온도에서의 변형 저항을 작게 하여 압출성을 향상시키는 작용이 있으며, Al-Fe-Si 금속간 화합물로서 정출 또는 석출하여 브레이징 시의 입계 이동을 방해하여 결정립 성장을 억제하게 된다.The silicon has a function of improving the extrudability by reducing the deformation resistance at the extrusion processing temperature, and crystallized or precipitated as an Al-Fe-Si intermetallic compound to inhibit grain boundary movement during brazing to suppress grain growth.

상기 규소의 함량 한정에 있어서, 그 함량이 0.05wt.% 미만일 경우에는 주조 시 모재인 잉곳(ingot)의 품위가 높아야 하기 때문에 제조비용이 상승하게 되어 바람직하지 않으며, 그 함량이 0.2wt.%를 초과할 경우에는 합금의 강도를 높이게 되어 압출성이 저하되기 때문에 바람직하지 않다.In the silicon content limitation, if the content is less than 0.05wt.%, The manufacturing cost is increased because the quality of the ingot (ingot), the base material during casting, is not preferable, the content is 0.2wt.% When exceeding, since the intensity | strength of an alloy increases and extrusion property falls, it is unpreferable.

상기 망간은 전이 원소로서 기호 Mn, 원자번호 25, 원자량 54.9381, 비중 7.2 내지 7.45, 융점 1244℃ 및 비점 1962℃의 특성이 있으며, 알루미늄 합금의 전체 중량 대비로 0.6 내지 1.2wt.%의 함량으로 포함되는 것이 바람직하다. The manganese has a characteristic of a symbol Mn, atomic number 25, atomic weight 54.9381, specific gravity 7.2 to 7.45, melting point 1244 ° C, and boiling point 1962 ° C as a transition element, and is contained in an amount of 0.6 to 1.2 wt.% Based on the total weight of the aluminum alloy. It is preferable to be.

상기 망간은 Al6Mn의 미세한 금속간 화합물로 석출하여 합금의 부식 전위를 귀(noble)하게 하여 브레이징 후의 강도를 향상시키며, 규소가 공존하는 경우에는 Al-Mn-Si 금속간 화합물로서 정출 또는 석출하여 브레이징 후의 강도를 향상시킨다. 이는 열교환기 튜브로 제조되었을 때, 열교환기 튜브의 부식 전위를 귀하게 조절하면 핀(fin)과의 전위차를 크게 할 수 있어 핀의 방식 효과를 보다 유효하게 하여 외부 내식성을 향상시키는 작용을 한다.The manganese is precipitated with a fine intermetallic compound of Al 6 Mn to make the corrosion potential of the alloy noble to improve the strength after brazing, and when silicon coexists, it is crystallized or precipitated as an Al-Mn-Si intermetallic compound. To improve the strength after brazing. When the heat exchanger tube is made of a heat exchanger tube, the corrosion potential of the heat exchanger tube can be adjusted to increase the potential difference with the fin (fin), thereby making the anticorrosive effect of the fin more effective, thereby improving external corrosion resistance.

상기 망간의 함량 한정에 있어서, 그 함량이 0.6wt.% 미만일 경우 내식성 등 망간을 첨가한 효과가 나타나기 어려워 바람직하지 않으며, 그 함량이 1.2wt.%를 초과할 경우에는 압출성이 저하되기 때문에 바람직하지 않다.In the content limitation of manganese, when the content is less than 0.6wt.%, It is not preferable because the effect of adding manganese, such as corrosion resistance is not preferable, and when the content exceeds 1.2wt.% Is preferable because the extrudability is lowered Not.

상기 구리는 전이 원소로서 기호 Cu, 원자번호 29, 원자량 63.546, 비중 8.92, 융점 1084.5℃ 및 비점 2595℃의 특성이 있으며, 알루미늄 합금의 전체 중량 대비로 0.15 내지 0.45wt.%의 함량으로 포함되는 것이 바람직하다. The copper has a characteristic of symbol Cu, atomic number 29, atomic weight 63.546, specific gravity 8.92, melting point 1084.5 ° C and boiling point 2595 ° C as a transition element, and is contained in an amount of 0.15 to 0.45 wt.% Based on the total weight of the aluminum alloy. desirable.

상기 구리는 기지(Matrix)에 고용하여 브레이징 후의 강도를 향상시키며, 열교환기 튜브로 제조되었을 때, 열교환기 튜브의 부식 전위를 귀하게 하여 내식성을 향상시키는 작용을 한다.The copper is dissolved in the matrix (Matrix) to improve the strength after brazing, and when made of a heat exchanger tube, it serves to improve the corrosion resistance by making the corrosion potential of the heat exchanger tube precious.

상기 구리의 함량 한정에 있어서, 그 함량이 0.12wt.% 미만일 경우 내식성 등 구리를 첨가한 효과가 나타나기 어려워 바람직하지 않으며, 그 함량이 0.45wt.%를 초과할 경우에는 압출성과 내식성이 동시에 저하되기 때문에 바람직하지 않다.In the limited amount of copper, when the content is less than 0.12wt.%, It is not preferable that the effect of adding copper, such as corrosion resistance, is not preferable, and when the content is more than 0.45wt.%, The extrudability and the corrosion resistance are simultaneously reduced. Because it is not desirable.

상기와 같은 알루미늄 합금으로 제조되는 본 발명의 바람직한 실시예에 따른 열교환기 튜브의 제조방법에 대하여 도 1 및 2를 참조하여 설명하기로 한다.A method of manufacturing a heat exchanger tube according to a preferred embodiment of the present invention made of the aluminum alloy as described above will be described with reference to FIGS. 1 and 2.

도 1은 본 발명의 제1실시예에 따른 열교환기 튜브의 제조방법을 설명하기 위해 도시한 흐름도이고, 도 2는 본 발명의 제2실시예에 따른 열교환기 튜브의 제조방법을 설명하기 위해 도시한 흐름도이다.1 is a flowchart illustrating a method of manufacturing a heat exchanger tube according to a first embodiment of the present invention, Figure 2 is a view for explaining a method of manufacturing a heat exchanger tube according to a second embodiment of the present invention. One flow chart.

본 발명의 제1실시예에 따른 열교환기 튜브의 제조방법은, 먼저, 도 1을 참조하면, 단계(S101)에서, 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 알루미늄 합금을, 750 내지 900℃의 온도 범 위에서 용탕의 상태로 주입하고, 연속주조(continuous casting)를 통해 빌렛(billet)을 형성한다.In the manufacturing method of the heat exchanger tube according to the first embodiment of the present invention, first, referring to FIG. 1, in step S101, 0.05 to 0.5 wt.% Of iron, and 0.05 to 0.2 wt.% Of silicon and , An aluminum alloy containing 0.6 to 1.2 wt.% Manganese and 0.15 to 0.45 wt.% Copper, the balance being aluminum and inevitable impurities, in a molten state at a temperature range of 750 to 900 ° C., The billet is formed through continuous casting.

단계(S201)에서, 상기 빌렛을 300 내지 500℃의 온도 범위에서 예열 후, 압출 온도 300 내지 500℃에서 압출하여 열교환기 튜브를 형성한다.In step S201, the billet is preheated in a temperature range of 300 to 500 ° C, and then extruded at an extrusion temperature of 300 to 500 ° C to form a heat exchanger tube.

본 발명의 제2실시예에 따른 열교환기 튜브의 제조방법은, 먼저, 도 2를 참조하면, 단계(S102)에서, 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 알루미늄 합금을, 750 내지 900℃의 온도 범위에서 용탕의 상태로 주입하고, 연속주조압연(properzi)을 통해 와이어 로드를 형성한다. 이 때, 와이어 로드는 8.0 내지 15mmΦ의 직경을 갖는다.In the manufacturing method of the heat exchanger tube according to the second embodiment of the present invention, first, referring to FIG. 2, in step S102, 0.05 to 0.5 wt.% Of iron, and 0.05 to 0.2 wt.% Of silicon; , An aluminum alloy containing 0.6 to 1.2 wt.% Manganese and 0.15 to 0.45 wt.% Copper, the balance being aluminum and inevitable impurities, in a molten state at a temperature range of 750 to 900 ° C., The wire rod is formed by continuous casting (properzi). At this time, the wire rod has a diameter of 8.0 to 15 mmΦ.

단계(S202)에서, 상기 와이어 로드를 450 내지 650℃의 온도 범위에서 10 내지 25시간 동안 열처리한다.In step S202, the wire rod is heat-treated for 10 to 25 hours in the temperature range of 450 to 650 ℃.

단계(S302)에서, 열처리된 와이어 로드를 컨펌 압출을 통해 열교환기 튜브를 형성한다.In step S302, the heat-treated wire rod is formed through conform extrusion to form a heat exchanger tube.

상술된 제1 및 제2실시예에서 상기 용탕의 주입 온도 범위는 금속간 화합물인 고용체 즉, 치밀한 미세조직을 갖는 주물을 얻기 위함이며, 상기 용탕의 주입 온도가 900℃를 초과시에는 주물의 미세조직이 조대해지는 문제가 있으며, 750℃ 미만에서는 상기 용탕의 유동성이 부족하여 주형 공간을 치밀하게 채우지 못하는 미스런(Miss Run) 현상이 발생하게 되므로 750 내지 900℃의 온도 범위가 최적이다.In the above-described first and second embodiments, the injection temperature range of the molten metal is to obtain a solid solution that is an intermetallic compound, that is, a casting having a dense microstructure. There is a problem of coarsening, and the temperature range of 750 to 900 ° C. is optimal because a miss run phenomenon occurs in which the fluidity of the molten metal is insufficient to fill the mold space densely below 750 ° C.

한편, 제조된 열교환기 튜브는 극한의 내식성이 요구되는 경우, 희생양극 효과를 부여하기 위한 아연 용사(TAS, thermal arc spray) 처리를 열교환기 튜브 표면에 실시할 수도 있다.On the other hand, the manufactured heat exchanger tube may be subjected to thermal arc spray (TAS) treatment on the surface of the heat exchanger tube in order to provide a sacrificial anode effect when extreme corrosion resistance is required.

이하, 본 발명의 이해를 돕기 위하여 바람직한 실시예(1~2)와 이에 대비되는 비교예(1~3)를 통하여 보다 구체적으로 설명하기로 한다. 그러나, 실시예는 본 발명의 예시에 불과할 뿐, 본 발명의 범위가 이에 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to preferred examples (1 to 2) and comparative examples (1 to 3) in contrast thereto. However, the embodiments are only illustrative of the present invention, and the scope of the present invention is not limited thereto.

본 발명에 따른 알루미늄 합금(실시예 1~2)과 이에 대비되는 알루미늄 합금(비교예 1~3)을 마련하였다. 이들 합금의 조성을 알 수 있는 성분분석 결과를 표 1에 나타내었다. 표 1에서, 이들 합금의 조성은 중량%로 나타내었으며, 각 합금에는 불가피한 불순물을 함유할 수 있다는 점을 고려하였다.An aluminum alloy according to the present invention (Examples 1 to 2) and an aluminum alloy (Comparative Examples 1 to 3) were prepared. Table 1 shows the results of the component analysis, which shows the composition of these alloys. In Table 1, the compositions of these alloys are expressed in weight percent, taking into account that each alloy may contain unavoidable impurities.


조성(wt.%)Composition (wt.%)
FeFe CuCu MnMn SiSi ZrZr TiTi AlAl 실시예1Example 1 0.450.45 0.400.40 1.01.0 0.10.1 -- -- Bal.Honey. 실시예2Example 2 0.450.45 0.400.40 0.750.75 0.10.1 -- -- Bal.Honey. 비교예1Comparative Example 1 0.100.10 0.020.02 0.050.05 0.060.06 -- -- Bal.Honey. 비교예2Comparative Example 2 0.150.15 0.070.07 1.031.03 0.080.08 -- -- Bal.Honey. 비교예3Comparative Example 3 0.220.22 0.400.40 -- 0.070.07 0.040.04 0.0080.008 Bal.Honey.

전술한 알루미늄 합금(실시예 1~2 및 비교예 1~3)들은 합금의 주조시 합금 용탕의 온도를 750 내지 900℃의 온도 범위에서 제어하고 연속주조압연(properzi)을 통하여 와이어 로드 형태로 제조한 후 열처리하였다. 이 후 컨펌 압출을 통해 열교환기 튜브를 제조하였다.The above-described aluminum alloys (Examples 1 to 2 and Comparative Examples 1 to 3) are manufactured in the form of wire rods by controlling the temperature of the molten alloy at a temperature range of 750 to 900 ° C. during casting of the alloy and through continuous casting rolling (properzi). After heat treatment. Thereafter, heat exchanger tubes were manufactured through conform extrusion.

이렇게 제조된 열교환기 튜브의 내식 특성을 평가하기 위해 ASTM 규격을 기준으로 한 SWAAT 평가를 실시하였으며 그 결과를 표 2에 나타내었다. 이 때, 사용된 열교환기 튜브는 모두 브레이징(brazing) 모사 처리(600℃×10min)를 행한 후 SWAAT 평가를 실시하였다.In order to evaluate the corrosion resistance characteristics of the heat exchanger tube thus manufactured, SWAAT evaluation based on ASTM standard was performed and the results are shown in Table 2. At this time, all the heat exchanger tubes used were subjected to SWAAT evaluation after performing a brazing simulation process (600 ° C. × 10 min).

압출성Extrudability 아연 용사 여부Whether zinc is sprayed SWAAT Leak Time(hr)SWAAT Leak Time (hr) 실시예1Example 1 ×× 850850 실시예2Example 2 ×× 810810 비교예1Comparative Example 1 420420 비교예2Comparative Example 2 380380 비교예3Comparative Example 3 450450

상기 SWAAT 평가는 ASTM 표준 G85에 따른 시험으로 4.2wt.%의 NaCl 용액에 Glacial Acetic acid를 첨가하여 pH 2.8 내지 3.0이 유지되도록 하여 49℃의 온도 분위기 하에서 0.07MPa 압력으로 분사하는 실험을 수행하였다. 이 때, 분무량은 1 내지 2㎖/hr를 유지하였다.The SWAAT evaluation was performed in accordance with ASTM standard G85 to add a glacial Acetic acid to 4.2wt.% NaCl solution to maintain a pH of 2.8 to 3.0 to spray at 0.07MPa pressure at 49 ℃ temperature atmosphere. At this time, the spray amount was maintained at 1 to 2 ml / hr.

상기 표 2를 통해 확인할 수 있는 바와 같이, 실시예 1 및 2는 비교예 1 내지 3에 비하여 압출성은 우수하고 희생양극 효과를 나타내는 아연 용사 처리 없이도 내식 특성이 비교예 1 내지 3 보다 매우 우수한 성능을 나타내고 있음을 알 수 있다. 따라서, 본 발명에 따른 알루미늄 합금을 이용한 열교환기 튜브는 다양한 부식 환경 하에서도 공식(pitting) 없이 장기간 사용할 수 있다.As can be seen through Table 2, Examples 1 and 2 have superior performance compared to Comparative Examples 1 to 3 and excellent corrosion resistance characteristics compared to Comparative Examples 1 to 3 without the zinc spray treatment showing excellent extrudability and sacrificial anode effect. It can be seen that. Therefore, the heat exchanger tube using the aluminum alloy according to the present invention can be used for a long time without pitting even under various corrosion environments.

이상에서 본 발명은 비록 한정된 실시예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술사상과 아래에 기재될 특허청구범위의 균등범위 내에서 다양한 수정 및 변형이 가능함은 물론이다.Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

본 명세서에 첨부되는 다음의 도면들은 본 발명의 바람직한 실시예를 예시하는 것이며, 전술된 발명의 상세한 설명과 함께 본 발명의 기술 사상을 더욱 이해시키는 역할을 하는 것이므로, 본 발명은 그러한 도면에 기재된 사항에만 한정되어 해석되어서는 아니된다.The following drawings, which are attached to this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical idea of the present invention, the present invention includes the matters described in such drawings. It should not be construed as limited to.

도 1은 본 발명의 제1실시예에 따른 열교환기 튜브의 제조방법을 설명하기 위해 도시한 흐름도이다.1 is a flowchart illustrating a method of manufacturing a heat exchanger tube according to a first embodiment of the present invention.

도 2는 본 발명의 제2실시예에 따른 열교환기 튜브의 제조방법을 설명하기 위해 도시한 흐름도이다.2 is a flowchart illustrating a method of manufacturing a heat exchanger tube according to a second embodiment of the present invention.

Claims (5)

0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 것을 특징으로 하는 열교환기 튜브용 고내식성 알루미늄 합금.0.05 to 0.5 wt.% Of iron, 0.05 to 0.2 wt.% Of silicon, 0.6 to 1.2 wt.% Of manganese, and 0.15 to 0.45 wt.% Of copper, with the balance being aluminum and inevitable impurities. High corrosion resistance aluminum alloy for heat exchanger tube, characterized in that. 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 알루미늄 합금을,0.05 to 0.5 wt.% Of iron, 0.05 to 0.2 wt.% Of silicon, 0.6 to 1.2 wt.% Of manganese, and 0.15 to 0.45 wt.% Of copper, with the balance being aluminum and inevitable impurities. Aluminum alloy, (a) 합금 용탕의 상태로 주입하고, 연속주조(continuous casting)를 통해 빌렛(billet)을 형성하는 단계;(a) injecting the molten alloy into a molten state and forming a billet through continuous casting; (b) 상기 빌렛을 300 내지 500℃의 온도 범위에서 예열 후, 압출 온도 300 내지 500℃에서 압출하여 열교환기 튜브를 형성하는 단계;를 포함하는 것을 특징으로 하는 열교환기 튜브의 제조방법.(b) preheating the billet at a temperature in the range of 300 to 500 ° C. and extruding at an extrusion temperature of 300 to 500 ° C. to form a heat exchanger tube. 0.05 내지 0.5wt.%의 철과, 0.05 내지 0.2wt.%의 규소와, 0.6 내지 1.2wt.%의 망간과, 0.15 내지 0.45wt.%의 구리를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어진 알루미늄 합금을,0.05 to 0.5 wt.% Of iron, 0.05 to 0.2 wt.% Of silicon, 0.6 to 1.2 wt.% Of manganese, and 0.15 to 0.45 wt.% Of copper, with the balance being aluminum and inevitable impurities. Aluminum alloy, (a) 합금 용탕의 상태로 주입하고, 연속주조압연(properzi)을 통해 와이어 로드를 형성하는 단계; (a) injecting the molten alloy into a molten state and forming a wire rod through continuous casting rolling; (b) 상기 와이어 로드를 450 내지 650℃의 온도 범위에서 10 내지 25 시간 동안 열처리하는 단계; 및(b) heat treating the wire rod for 10 to 25 hours in a temperature range of 450 to 650 ° C .; And (c) 상기 열처리된 와이어 로드를 컨펌 압출을 통해 열교환기 튜브를 형성하는 단계;를 포함하는 것을 특징으로 하는 열교환기 튜브의 제조방법.(c) forming a heat exchanger tube through conformal extrusion of the heat treated wire rod. 제2항 또는 제3항에 있어서,The method according to claim 2 or 3, 상기 합금 용탕의 주입 온도는 750 내지 900℃의 온도 범위인 것을 특징으로 하는 열교환기 튜브의 제조방법.Injection temperature of the molten alloy is a method for producing a heat exchanger tube, characterized in that the temperature range of 750 to 900 ℃. 제2항 또는 제3항에 있어서,The method according to claim 2 or 3, 상기 제조된 열교환기 튜브 표면을 아연 용사(TAS, thermal arc spray) 처리하는 단계;를 더 포함하는 것을 특징으로 하는 열교환기 튜브의 제조방법.Thermal arc spray (TAS) treatment on the surface of the manufactured heat exchanger tube;
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