WO2015021383A1 - High strength aluminum alloy fin stock for heat exchanger - Google Patents

High strength aluminum alloy fin stock for heat exchanger Download PDF

Info

Publication number
WO2015021383A1
WO2015021383A1 PCT/US2014/050346 US2014050346W WO2015021383A1 WO 2015021383 A1 WO2015021383 A1 WO 2015021383A1 US 2014050346 W US2014050346 W US 2014050346W WO 2015021383 A1 WO2015021383 A1 WO 2015021383A1
Authority
WO
WIPO (PCT)
Prior art keywords
aluminum alloy
fin stock
ingot
heat exchanger
stock material
Prior art date
Application number
PCT/US2014/050346
Other languages
French (fr)
Inventor
Andrew D. Howells
Kevin Michael Gatenby
Original Assignee
Novelis Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novelis Inc. filed Critical Novelis Inc.
Priority to CN201480044210.9A priority Critical patent/CN105452499A/en
Priority to BR112016002234A priority patent/BR112016002234A2/en
Priority to US14/909,798 priority patent/US20160195346A1/en
Priority to KR1020167006163A priority patent/KR20160042056A/en
Priority to MX2016001557A priority patent/MX2016001557A/en
Priority to KR1020187015733A priority patent/KR20180063380A/en
Priority to JP2016533468A priority patent/JP2016534223A/en
Priority to EP14755495.0A priority patent/EP3030684A1/en
Priority to CA2919193A priority patent/CA2919193A1/en
Publication of WO2015021383A1 publication Critical patent/WO2015021383A1/en

Links

Classifications

    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • 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
    • B22D21/002Castings of light metals
    • B22D21/007Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00Casting ingots, e.g. from ferrous metals
    • B22D7/005Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04Modified aluminium-silicon alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/10Alloys based on aluminium with zinc as the next major constituent
    • 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
    • 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
    • C22F1/043Changing 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
    • 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
    • C22F1/053Changing 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/10Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/124Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and being formed of pins
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00Fins
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00Fastening; Joining
    • F28F2275/04Fastening; Joining by brazing

Definitions

  • the present invention relates to the fields of material science, material chemistry, metallurgy, aluminum alloys, aluminum fabrication, and related fields.
  • the present invention provides novel aluminum alloys for use in the production of heat exchanger fins, which are, in turn, employed in various heat exchanger devices, for example, motor vehicle radiators, condensers, evaporators and related devices.
  • the present invention provides an aluminum alloy fin stock alloy material with higher strength, and improved sag resistance for use in heat exchangers.
  • This aluminum alloy fin stock alloy material was made by direct chill (DC) casting.
  • a DC fin stock material was developed with desirable pre-braze (HI 4 temper) and post-braze mechanical properties, sag resistance, corrosion resistance and conductivity.
  • the aluminum alloy fin stock alloy displays larger grain and improved strength before brazing.
  • the aluminum alloy fin stock alloy can be used in various applications, for example heat exchangers.
  • the fmstock is particularly useful for high performance light weight, automotive heat exchangers but could be used for other brazed applications including but not limited to HVAC.
  • the aluminum alloy fin stock alloy can be used in automotive heat exchangers such as radiators, condensers and evaporators.
  • the present invention provides an aluminum alloy fin stock alloy material with higher strength, improved corrosion resistance and improved sag resistance for use in heat exchangers, such as automotive heat exchangers.
  • This aluminum alloy fin stock alloy material was made by direct chill casting.
  • This DC fin stock material exhibits desirable pre -braze (HI 4 temper) and post- braze mechanical properties, sag resistance, corrosion resistance and conductivity.
  • the aluminum alloy fin stock alloy displays larger grain and improved strength before brazing.
  • the aluminum alloy fin stock alloy can be used in various applications, for example heat exchangers.
  • the aluminum alloy fin stock alloy can be used in automotive heat exchangers such as radiators, condensers and evaporators.
  • the DC fin stock material comprises about 0.8-1.4% Si, 0.4- 0.8% Fe, 0.05-0.4% Cu, 1.2-1.7% Mn and 1.2-2.3% Zn, remainder aluminum. All % values are in weight (wt)%.
  • the DC fin stock material comprises about 0.9-1.3% Si, 0.45-0.75% Fe, 0.10-0.30% Cu, 1.3-1.7% Mn and 1.30-2.2% Zn, remainder aluminum.
  • the DC fin stock material comprises about 0.9-1.2% Si, 0.50-0.75% Fe, 0.15-0.30% Cu, 1.4-1.6% Mn and 1.4-2.1% Zn, remainder aluminum.
  • Cr and/or Zr or other grain size controlling elements may be present in these alloy compositions up to 0.2 % each, up to 0.15% %, up to 0.1 %, up to 0.05 %, or up to 0.03 %. All % values are in weight (wt)%.
  • alloy compositions described herein may contain other minor elements sometimes referred to as unintentional elements, below 0.05%.
  • the ingots described herein are made with a Direct Chill (DC) process, which is commonly used throughout the aluminum sheet industry, whereby a large ingot -1.5 m x 0.6 m x 4 m is cast from a large holding furnace which supplies metal to a shallow mold or molds supplied with cooling water.
  • the solidifying ingot is continuously cooled by the direct impingement of the cooling water and is withdrawn slowly from the base of the mold until the full ingot or ingots are completed.
  • the ingot rolling surfaces are machined to remove surface segregation and irregularities.
  • the machined ingot is preheated for hot rolling.
  • the preheating temperature and duration are controlled to low levels to preserve a large grain size and high strength after the finished fin stock is brazed.
  • the ingot is hot rolled to form a coil which is then cold rolled.
  • the cold rolling process takes place in several steps and an interanneal in the range of about 300-450°C is applied to recrystallize the material prior to the final cold rolling step.
  • the material is cold rolled to obtain the desired final gauge and slit in narrow strips suitable for the manufacture of radiators and other automotive heat exchangers.
  • a pre-heat of the ingots prior to hot rolling is conducted in such a way that the final metal temperature achieved is about 480°C and is held there for an average of about 4 hours (typically a minimum of about 2 hours and a maximum of about 12 hours).
  • ingots (about 8 to 30) are charged to a furnace and preheated with gas or electricity to the rolling temperature.
  • Aluminum alloys are typically rolled in the range of about 450°C to about 560°C. If the temperature is too cold, the roll loads are too high, and if the temperature is too hot, the metal may be too soft and break up in the mill. In this case the preheat temperature is low relative to other aluminum products and the hold time is relatively short, to limit the growth of dispersoids that would decrease the final post braze grain size.
  • a hot mill is scheduled to roll many different ingots and alloys and cannot always roll the ingots at minimum soak time. In one embodiment, the minimum soak time at about 480°C is about 2 hours.
  • the inter-anneal temperature applied was about 400°C for an average of about 3 hours followed by applying % cold work (CW) of about 29% to final gauge.
  • the % CW is the degree of cold rolling applied to get the material in the final required strength range.
  • the % cold work is defined as: (initial gauge - final gauge)* 100/ initial gauge. As cold work increases, the H 14 strength increases, but final post braze grain size and sag resistance is decreased. 29 % is relatively low for most aluminum rolling applications.
  • a pre heat practice at about 480°C for an average of 4 hours is employed with an interanneal temperature of about 300-400°C and % CW of about 25-35% to final gauge.
  • a DC case alloy composition was made.
  • the composition range of the alloy was within the following specification: 1.1 ⁇ 0.1% Si, 0.6 ⁇ 0.1% Fe, 0.2 ⁇ 0.05% Cu, 1.4 ⁇ 0.1% Mn and 1.50 ⁇ 0.1% Zn with the remainder aluminum.
  • the alloy material had a minimum ultimate tensile strength of ⁇ T30MPa.
  • the alloy material had an average conductivity after brazing of -43 IACS (International Annealed Copper Standard (i.e., pure copper is 100% conductivity)) and an open circuit potential corrosion value (vs. Standard Calomel Electrode (SCE)) of -741 mV.
  • IACS International Annealed Copper Standard (i.e., pure copper is 100% conductivity)
  • SCE Standard Calomel Electrode
  • the alloy material produced exhibited a sag value between 28 mm where the final gauge was 49 ⁇ , and 43 mm where the final gauge was 83 ⁇ , which was within the required specifications at these gauges. These values were measured after applying a simulated brazing cycle whereby the sample was heated to a temperature of 605°C and cooled to room temperature in a period of about 20 minutes to simulate the temperature time profile of a commercial brazing process.
  • the alloy material produced varied in gauge between 49 and 83 ⁇ .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Metal Rolling (AREA)
  • Laminated Bodies (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The present invention provides an aluminum alloy fin stock alloy material with higher strength, and improved sag resistance for use in heat exchangers. This aluminum alloy fin stock alloy material was made by direct chill (DC) casting.

Description

HIGH STRENGTH ALUMINUM ALLOY FIN STOCK FOR HEAT EXCHANGER
CROSS REFERENCE TO RELATED APPLICATIONS
The present application claims the benefit of U.S. provisional patent application Serial No. 61/863,568 filed August 8, 2013, which is incorporated herein by reference in its entirety.
FIELD OF THE INVENTION
[0001] The present invention relates to the fields of material science, material chemistry, metallurgy, aluminum alloys, aluminum fabrication, and related fields. The present invention provides novel aluminum alloys for use in the production of heat exchanger fins, which are, in turn, employed in various heat exchanger devices, for example, motor vehicle radiators, condensers, evaporators and related devices.
BACKGROUND
[0002] There is a need for aluminum alloy fin stock with high strength and improved sag resistance high strength for use in various heat exchanger applications including radiators for automobiles. There is a need to obtain aluminum alloy fin stock with strong pre-braze mechanical properties, good behavior during brazing, i.e., enhanced brazed material sag resistance and reduced fin erosion, and good strength and conductivity characteristics after braze for high performance heat exchanger applications.
SUMMARY
[0003] The present invention provides an aluminum alloy fin stock alloy material with higher strength, and improved sag resistance for use in heat exchangers. This aluminum alloy fin stock alloy material was made by direct chill (DC) casting.
[0004] A DC fin stock material was developed with desirable pre-braze (HI 4 temper) and post-braze mechanical properties, sag resistance, corrosion resistance and conductivity. The aluminum alloy fin stock alloy displays larger grain and improved strength before brazing.
[0005] The aluminum alloy fin stock alloy can be used in various applications, for example heat exchangers. The fmstock is particularly useful for high performance light weight, automotive heat exchangers but could be used for other brazed applications including but not limited to HVAC. In one embodiment, the aluminum alloy fin stock alloy can be used in automotive heat exchangers such as radiators, condensers and evaporators. Other objects and advantages of the invention will be apparent from the following detailed description of embodiments of the invention.
DESCRIPTION
[0006] The present invention provides an aluminum alloy fin stock alloy material with higher strength, improved corrosion resistance and improved sag resistance for use in heat exchangers, such as automotive heat exchangers. This aluminum alloy fin stock alloy material was made by direct chill casting.
[0007] This DC fin stock material exhibits desirable pre -braze (HI 4 temper) and post- braze mechanical properties, sag resistance, corrosion resistance and conductivity. The aluminum alloy fin stock alloy displays larger grain and improved strength before brazing.
[0008] The aluminum alloy fin stock alloy can be used in various applications, for example heat exchangers. In one embodiment, the aluminum alloy fin stock alloy can be used in automotive heat exchangers such as radiators, condensers and evaporators.
[0009] In one embodiment, the DC fin stock material comprises about 0.8-1.4% Si, 0.4- 0.8% Fe, 0.05-0.4% Cu, 1.2-1.7% Mn and 1.2-2.3% Zn, remainder aluminum. All % values are in weight (wt)%.
[0010] In another embodiment, the DC fin stock material comprises about 0.9-1.3% Si, 0.45-0.75% Fe, 0.10-0.30% Cu, 1.3-1.7% Mn and 1.30-2.2% Zn, remainder aluminum.
[0011] In yet another embodiment, the DC fin stock material comprises about 0.9-1.2% Si, 0.50-0.75% Fe, 0.15-0.30% Cu, 1.4-1.6% Mn and 1.4-2.1% Zn, remainder aluminum.
[0012] Optionally, Cr and/or Zr or other grain size controlling elements may be present in these alloy compositions up to 0.2 % each, up to 0.15% %, up to 0.1 %, up to 0.05 %, or up to 0.03 %. All % values are in weight (wt)%.
[0013] It is to be understood that the alloy compositions described herein may contain other minor elements sometimes referred to as unintentional elements, below 0.05%.
Method of Making the Ingots
[0014] The ingots described herein are made with a Direct Chill (DC) process, which is commonly used throughout the aluminum sheet industry, whereby a large ingot -1.5 m x 0.6 m x 4 m is cast from a large holding furnace which supplies metal to a shallow mold or molds supplied with cooling water. The solidifying ingot is continuously cooled by the direct impingement of the cooling water and is withdrawn slowly from the base of the mold until the full ingot or ingots are completed. Once cooled from the casting process, the ingot rolling surfaces are machined to remove surface segregation and irregularities. The machined ingot is preheated for hot rolling. The preheating temperature and duration are controlled to low levels to preserve a large grain size and high strength after the finished fin stock is brazed. The ingot is hot rolled to form a coil which is then cold rolled. The cold rolling process takes place in several steps and an interanneal in the range of about 300-450°C is applied to recrystallize the material prior to the final cold rolling step. Next the material is cold rolled to obtain the desired final gauge and slit in narrow strips suitable for the manufacture of radiators and other automotive heat exchangers. A pre-heat of the ingots prior to hot rolling is conducted in such a way that the final metal temperature achieved is about 480°C and is held there for an average of about 4 hours (typically a minimum of about 2 hours and a maximum of about 12 hours). Several ingots (about 8 to 30) are charged to a furnace and preheated with gas or electricity to the rolling temperature. Aluminum alloys are typically rolled in the range of about 450°C to about 560°C. If the temperature is too cold, the roll loads are too high, and if the temperature is too hot, the metal may be too soft and break up in the mill. In this case the preheat temperature is low relative to other aluminum products and the hold time is relatively short, to limit the growth of dispersoids that would decrease the final post braze grain size. In practice a hot mill is scheduled to roll many different ingots and alloys and cannot always roll the ingots at minimum soak time. In one embodiment, the minimum soak time at about 480°C is about 2 hours. During production, the inter-anneal temperature applied was about 400°C for an average of about 3 hours followed by applying % cold work (CW) of about 29% to final gauge. The % CW is the degree of cold rolling applied to get the material in the final required strength range. The % cold work is defined as: (initial gauge - final gauge)* 100/ initial gauge. As cold work increases, the H 14 strength increases, but final post braze grain size and sag resistance is decreased. 29 % is relatively low for most aluminum rolling applications.
[0015] In one embodiment a pre heat practice at about 480°C for an average of 4 hours is employed with an interanneal temperature of about 300-400°C and % CW of about 25-35% to final gauge.
[0016] The finished cold rolled coil is then slit into many narrow strips of the width required by the heat exchanger manufacturer for forming, assembly and brazing into the finished heat exchanger. [0017] The following example will serve to further illustrate the present invention without, at the same time, however, constituting any limitation thereof. On the contrary, it is to be clearly understood that resort may be had to various embodiments, modifications and equivalents thereof which, after reading the description herein, may suggest themselves to those skilled in the art without departing from the spirit of the invention.
Example
[0018] A DC case alloy composition was made. The composition range of the alloy was within the following specification: 1.1±0.1% Si, 0.6±0.1% Fe, 0.2±0.05% Cu, 1.4±0.1% Mn and 1.50±0.1% Zn with the remainder aluminum. The alloy material had a minimum ultimate tensile strength of ~T30MPa. The alloy material had an average conductivity after brazing of -43 IACS (International Annealed Copper Standard (i.e., pure copper is 100% conductivity)) and an open circuit potential corrosion value (vs. Standard Calomel Electrode (SCE)) of -741 mV. The alloy material produced exhibited a sag value between 28 mm where the final gauge was 49 μιη, and 43 mm where the final gauge was 83 μιη, which was within the required specifications at these gauges. These values were measured after applying a simulated brazing cycle whereby the sample was heated to a temperature of 605°C and cooled to room temperature in a period of about 20 minutes to simulate the temperature time profile of a commercial brazing process. The alloy material produced varied in gauge between 49 and 83 μιη.
[0019] All patents, patent applications, publications, and abstracts cited above are incorporated herein by reference in their entirety. Various embodiments of the invention have been described in fulfillment of the various objectives of the invention. It should be recognized that these embodiments are merely illustrative of the principles of the present invention. Numerous modifications and adaptations thereof will be readily apparent to those of skill in the art without departing from the spirit and scope of the invention as defined in the following claims.

Claims

Claims
1. An aluminum alloy comprising about 0.8-1.4 wt% Si, 0.4-0.8 wt% Fe, 0.05-0.4 wt% Cu, 1.2-1.7 wt% Mn and 1.20-2.3 wt% Zn with the remainder as Al.
2. The aluminum alloy of claim 1, comprising about 0.9-1.3 wt% Si, 0.45-0.75 wt% Fe, 0.10-0.3 wt% Cu, 1.3-1.7 wt% Mn and 1.30-2.2 wt% Zn, with the remainder as Al.
3. The aluminum alloy of claim 1, comprising about 0.9-1.2 wt% Si, 0.5-0.75 wt% Fe, 0.15-0.3 wt% Cu, 1.4-1.6 wt% Mn and 1.4-2.1 wt% Zn, with the remainder as Al.
4. The aluminum alloy of any one of claims 1 to 3, further comprising up to 0.2 wt% of one or both of Cr or Zr.
5. An aluminum alloy fin stock material produced from the aluminum alloy of any one of claims 1 to 4 by a process, comprising:
direct chill casting the aluminum alloy into an ingot;
preheating the ingot to 450 to 560°C for 2 to 16 hours;
hot rolling the preheated ingot;
cold rolling the ingot;
inter-annealing at a temperature of 300-450°C; and,
after inter-annealing, performing a final cold rolling step to achieve % cold work (%CW) of 25-35%.
6. The aluminum alloy fin stock material of claim 5, wherein the ingot is preheated at 480°C for 2-12 hours.
7. The aluminum alloy fin stock material of claim 5 or 6, wherein the inter-annealing temperature is 300-400°C.
8. The aluminum alloy fin stock material of any one of claims 5 to 7, having a minimum ultimate tensile strength of ~130MPa, measured after brazing.
9. The aluminum alloy fin stock material of any one of claims 5 to 7, having a corrosion potential of -700 mV or less, measured after brazing.
10. A heat exchanger comprising the aluminum alloy of any one of claims 1 to 4 or the aluminum alloy fin stock material of any one of claims 5 to 9.
11. The heat exchanger of claim 10, wherein the heat exchanger is an automotive heat exchanger.
12. The heat exchanger of claim 10, wherein the heat exchanger is a radiator, a condenser or an evaporator.
13. Use of the aluminum alloy of any one of claims 1 to 4 or the aluminum alloy fin stock material of any one of claims 5 to 9 for fabrication of heat exchanger fins.
14. A process for making an aluminum alloy fin stock material, comprising:
direct chill casting the aluminum alloy of any one of claims 1 to 4 into an ingot;
preheating the ingot to 450 to 560°C for 2 to 16 hours;
hot rolling the preheated ingot;
cold rolling the ingot;
inter-annealing at a temperature of 300-450°C; and,
after inter-annealing, performing a final cold rolling step to achieve % cold work (%CW) of 25-35%.
15. The process of claim 14, wherein the ingot is preheated at 480°C for 2-12 hours.
16. The process of claim 14 or 15, wherein the inter-annealing temperature is 300-400°C.
PCT/US2014/050346 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger WO2015021383A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CN201480044210.9A CN105452499A (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger
BR112016002234A BR112016002234A2 (en) 2013-08-08 2014-08-08 aluminum alloy, aluminum alloy fin stock material, heat exchanger, use of an aluminum alloy or aluminum alloy fin stock material, and process for making an alloy fin stock material aluminum
US14/909,798 US20160195346A1 (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger
KR1020167006163A KR20160042056A (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger
MX2016001557A MX2016001557A (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger.
KR1020187015733A KR20180063380A (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger
JP2016533468A JP2016534223A (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin material for heat exchanger
EP14755495.0A EP3030684A1 (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger
CA2919193A CA2919193A1 (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361863568P 2013-08-08 2013-08-08
US61/863,568 2013-08-08

Publications (1)

Publication Number Publication Date
WO2015021383A1 true WO2015021383A1 (en) 2015-02-12

Family

ID=51398901

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/050346 WO2015021383A1 (en) 2013-08-08 2014-08-08 High strength aluminum alloy fin stock for heat exchanger

Country Status (9)

Country Link
US (1) US20160195346A1 (en)
EP (1) EP3030684A1 (en)
JP (1) JP2016534223A (en)
KR (2) KR20160042056A (en)
CN (1) CN105452499A (en)
BR (1) BR112016002234A2 (en)
CA (1) CA2919193A1 (en)
MX (1) MX2016001557A (en)
WO (1) WO2015021383A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9719156B2 (en) 2011-12-16 2017-08-01 Novelis Inc. Aluminum fin alloy and method of making the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2016001558A (en) * 2013-08-08 2016-05-02 Novelis Inc High strength aluminum alloy fin stock for heat exchanger.
JP6751713B2 (en) 2014-08-06 2020-09-09 ノベリス・インコーポレイテッドNovelis Inc. Aluminum alloy for heat exchanger fins
CN105734368B (en) * 2014-12-24 2020-03-17 三菱铝株式会社 Aluminum alloy fin material, method for producing same, and heat exchanger provided with same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1088265A (en) * 1996-09-06 1998-04-07 Sumitomo Light Metal Ind Ltd Aluminum alloy fin material for heat exchanger, excellent in sacrificial anode effect as well as in strength after brazing
JP2002161324A (en) * 2000-11-17 2002-06-04 Sumitomo Light Metal Ind Ltd Aluminum alloy fin-material for heat exchanger superior in formability and brazability
US20040028940A1 (en) * 2002-06-24 2004-02-12 Taketoshi Toyama Aluminum alloy fin material for heat exchangers and heat exchanger including the fin material
EP1717327A1 (en) * 2004-02-03 2006-11-02 Nippon Light Metal Company Ltd. High strength aluminum alloy fin material for heat exchanger and method for production thereof
EP1753885A1 (en) * 2004-05-26 2007-02-21 Corus Aluminium Walzprodukte GmbH Process for producing an aluminium alloy brazing sheet, aluminium alloy brazing sheet
EP1918394A2 (en) * 2006-10-13 2008-05-07 Sapa Heat Transfer AB High strength and sagging resistant fin material
JP2012126950A (en) * 2010-12-14 2012-07-05 Mitsubishi Alum Co Ltd Aluminum alloy fin material for heat exchanger and heat exchanger using the fin material
WO2013111884A1 (en) * 2012-01-27 2013-08-01 古河スカイ株式会社 Aluminum alloy for heat exchanger fin and manufacturing method therefor, as well as heat exchanger using said aluminum alloy

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62196348A (en) * 1986-02-20 1987-08-29 Sumitomo Light Metal Ind Ltd Fin material for heat exchanger made of aluminum alloy
JP3847077B2 (en) * 2000-11-17 2006-11-15 住友軽金属工業株式会社 Aluminum alloy fin material for heat exchangers with excellent formability and brazing
US7898385B2 (en) * 2002-06-26 2011-03-01 Robert William Kocher Personnel and vehicle identification system using three factors of authentication
JP5195837B2 (en) * 2010-07-16 2013-05-15 日本軽金属株式会社 Aluminum alloy fin material for heat exchanger
JP5836695B2 (en) * 2011-08-12 2015-12-24 株式会社Uacj Aluminum alloy fin material for heat exchangers with excellent strength and corrosion resistance after brazing
JP2014052366A (en) * 2012-08-06 2014-03-20 Ricoh Co Ltd Optical measurement instrument and vehicle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1088265A (en) * 1996-09-06 1998-04-07 Sumitomo Light Metal Ind Ltd Aluminum alloy fin material for heat exchanger, excellent in sacrificial anode effect as well as in strength after brazing
JP2002161324A (en) * 2000-11-17 2002-06-04 Sumitomo Light Metal Ind Ltd Aluminum alloy fin-material for heat exchanger superior in formability and brazability
US20040028940A1 (en) * 2002-06-24 2004-02-12 Taketoshi Toyama Aluminum alloy fin material for heat exchangers and heat exchanger including the fin material
EP1717327A1 (en) * 2004-02-03 2006-11-02 Nippon Light Metal Company Ltd. High strength aluminum alloy fin material for heat exchanger and method for production thereof
EP1753885A1 (en) * 2004-05-26 2007-02-21 Corus Aluminium Walzprodukte GmbH Process for producing an aluminium alloy brazing sheet, aluminium alloy brazing sheet
EP1918394A2 (en) * 2006-10-13 2008-05-07 Sapa Heat Transfer AB High strength and sagging resistant fin material
JP2012126950A (en) * 2010-12-14 2012-07-05 Mitsubishi Alum Co Ltd Aluminum alloy fin material for heat exchanger and heat exchanger using the fin material
WO2013111884A1 (en) * 2012-01-27 2013-08-01 古河スカイ株式会社 Aluminum alloy for heat exchanger fin and manufacturing method therefor, as well as heat exchanger using said aluminum alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9719156B2 (en) 2011-12-16 2017-08-01 Novelis Inc. Aluminum fin alloy and method of making the same

Also Published As

Publication number Publication date
EP3030684A1 (en) 2016-06-15
CN105452499A (en) 2016-03-30
US20160195346A1 (en) 2016-07-07
BR112016002234A2 (en) 2017-08-01
KR20180063380A (en) 2018-06-11
MX2016001557A (en) 2016-05-02
KR20160042056A (en) 2016-04-18
JP2016534223A (en) 2016-11-04
CA2919193A1 (en) 2015-02-12

Similar Documents

Publication Publication Date Title
US11933553B2 (en) Aluminum alloy for heat exchanger fins
CA2919662C (en) High strength aluminum alloy fin stock for heat exchanger
JP5186185B2 (en) High-strength aluminum alloy material for automobile heat exchanger fins excellent in formability and erosion resistance used for fin material for high-strength automobile heat exchangers manufactured by brazing, and method for producing the same
JP4408567B2 (en) Method of manufacturing aluminum alloy fin material
WO2015141698A1 (en) Aluminum alloy fin material for heat exchanger, method for manufacturing same, and heat exchanger
JP2008308761A (en) Method for producing high strength aluminum alloy material for automobile heat exchanger having excellent erosion resistance and used for high strength automobile heat exchanger member produced by brazing
JP4911657B2 (en) High conductivity aluminum fin alloy
WO2015021383A1 (en) High strength aluminum alloy fin stock for heat exchanger
JP2003138356A (en) Method for manufacturing high-strength aluminum-alloy brazing sheet for heat exchanger, having excellent brazability, formability and erosion resistance
JP2009293059A (en) High strength aluminum alloy fin material having excellent erosion resistance, method for producing the same, and automobile heat exchanger
JP6154224B2 (en) Aluminum alloy fin material for heat exchanger and manufacturing method thereof
JP3735700B2 (en) Aluminum alloy fin material for heat exchanger and method for producing the same
JP6154225B2 (en) Aluminum alloy fin material for heat exchanger and manufacturing method thereof
JPH0747802B2 (en) Method for manufacturing vacuum brazed structure

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201480044210.9

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14755495

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2919193

Country of ref document: CA

ENP Entry into the national phase

Ref document number: 2016533468

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: MX/A/2016/001557

Country of ref document: MX

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112016002234

Country of ref document: BR

WWE Wipo information: entry into national phase

Ref document number: 2014755495

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 20167006163

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 112016002234

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20160201