US20020040746A1 - Architectural aluminum alloy material and process for manufacturing the same - Google Patents

Architectural aluminum alloy material and process for manufacturing the same Download PDF

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Publication number
US20020040746A1
US20020040746A1 US09/928,134 US92813401A US2002040746A1 US 20020040746 A1 US20020040746 A1 US 20020040746A1 US 92813401 A US92813401 A US 92813401A US 2002040746 A1 US2002040746 A1 US 2002040746A1
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Prior art keywords
treatment
baking finish
rolling
temperature
alloy material
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US09/928,134
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English (en)
Inventor
Kiyohiro Kawai
Yoshiro Togami
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Assigned to FURUKAWA ELECTRIC CO., LTD., THE reassignment FURUKAWA ELECTRIC CO., LTD., THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAWAI, KIYOHIRO, TOGAMI, YOSHIRO
Publication of US20020040746A1 publication Critical patent/US20020040746A1/en
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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
    • 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

Definitions

  • the present invention relates to an architectural aluminum (Al) alloy material and a process for manufacturing the same. More specifically, the present invention relates to an architectural Al alloy material, which is to be put into practical uses as a building material with the premise that it is subjected to a baking finish treatment in a high temperature region of 260 to 280° C. and which undergoes minor loss of proof stress and retains sufficient elongation even after the baking finish treatment to show excellent bendability, as well as, to a process for manufacturing the same.
  • Al alloy materials are light, they are used as exterior wall materials and interior finishing materials for high-rise buildings or as curtain wall materials.
  • an Al alloy plate 1 is subjected to 90-degree bending, for example, as shown in FIG. 1.
  • acute-angle bending is on the increase to bend Al alloy plates by beyond 90° ( ⁇ >90°), as shown in FIG. 2.
  • FIG. 3 An example of bending treatment is shown in FIG. 3, in which a notch 3 is formed on an Al alloy material 1 , and the alloy material 1 is bent along this notch 3 .
  • the Al alloy material 1 Before the Al alloy material 1 is bent as described above, it is subjected to a baking finish treatment using a coating material such as a fluorine coat, an acrylic resin coating and a urethane resin coating at a predetermined temperature so as to enhance decorative design and corrosion resistance of the material 1 .
  • a coating material such as a fluorine coat, an acrylic resin coating and a urethane resin coating
  • A3004-H24 (3004 defined by B209 of ASTM) and A3004-H32 (3004 defined by B209 of ASTM) materials have conventionally been used, primarily in view of their strength properties.
  • an Al alloy material of predetermined specifications is melted first to form an ingot thereof.
  • the ingot is then subjected to a soaking treatment at a predetermined temperature for a predetermined time, followed by a hot rolling treatment at a predetermined processing rate.
  • the solidification structure of the ingot is converted into a fiber structure as it is rolled out in the rolling direction.
  • the resulting rolled alloy material is subjected to cold rolling to effect finely dividing of the crystal grains and thickness adjustment, and after the alloy material is annealed to remove processing strain, it is subjected again to cold rolling and heat treatment for removing the strain occurred in the cold rolling.
  • the thus treated Al alloy material is used in practical applications.
  • the A3004-H24 material and the like described above are those which are all subjected finally to the cold rolling treatment, so that they have finely divided grains of recrystallized structure.
  • fiber structures remain in these materials, so that they can be subjected to sharp 90-degree bending.
  • the present invention provides an architectural Al alloy material, which is a hot rolled material defined by JIS A3003 (3003 defined by B209 of ASTM); the material containing, in terms of a structure after a baking finish treatment at a temperature of not higher than 300° C., a fiber structure and a recrystallized grain structure having an area ratio of 20% or less; wherein the material undergoes a proof stress loss of 10% or less after the baking finish treatment.
  • the present invention also provides a process for manufacturing an architectural Al alloy material including the steps of subjecting an ingot of JIS A3003 (3003 defined by B209 of ASTM) to a soaking treatment; and subjecting the resulting ingot to hot rolling to be carried out in such a way that it has a temperature of 290 to 340° C. at the end of rolling; wherein the thus treated ingot is as such applied to a practical use.
  • FIG. 1 is a schematic drawing showing 90-degree bending of a plate material
  • FIG. 2 is a schematic drawing showing acute-angle bending of a plate material
  • FIG. 3 is a schematic drawing showing 90-degree bending of a notched plate material
  • FIG. 4 shows a photomicrographic structure of a plate material in Example 9
  • FIG. 5 shows a photomicrographic structure of a plate material in Comparative Example 8.
  • FIG. 6 is a schematic view of a plate material bent at right angles to the rolling direction.
  • FIG. 7 is a schematic view of a plate material bent parallel to the rolling direction.
  • the Al alloy material according to the present invention is prepared merely by subjecting an A3003 material having excellent strength properties to a hot rolling treatment under the conditions to be described later and is put into practical uses directly after the treatment.
  • the alloy material of the present invention is not manufactured by going through the hot rolling, followed by cold rolling, process annealing, cold rolling and heat treatment.
  • Al alloy material of the present invention is manufactured typically as follows:
  • an A3003 material having a predetermined composition is melted to form an ingot thereof.
  • the ingot is then subjected to soaking and then to hot rolling.
  • the soaking treatment is preferably carried out in a temperature range of 500 to 630° C. for about 1 to 15 hours. If the soaking treatment is carried out at a temperature of lower than 500° C., intermetallic compounds containing substantially, for example, AlMn decreases in quantity, and grains of recrystallized structure growing from the solidification structure are coarsened, to be likely to cause drop in bendability of the material and to mar appearance thereof. Further, if the soaking treatment is carried out at a temperature of higher than 630° C., deformation, blisters and the like occur in the ingot, which are causative of structural defects in the subsequent step (hot rolling). Therefore, the soaking treatment is carried out preferably at a temperature of 600 to 630° C.
  • the soaking treatment is carried out for less than one hour, the ingot cannot be soaked entirely, making it difficult to carry out homogeneous hot rolling. On the other hand, even if the soaking treatment is carried out for more than 15 hours, the soaking effect is saturated, and it is nothing but waste of thermal energy, uneconomically.
  • the soaking treatment is desirably carried out for 2 to 6 hours.
  • the ingot having undergone the soaking treatment as described above is then subjected immediately to hot rolling, where the solidification structure of the ingot is converted to a fiber structure and also finely divided secondary structure (subgrains) is caused to grow.
  • the A3003 material according to the present invention can be put into practical uses as a building material directly after completion of the hot rolling treatment. Therefore, at the point when the material is put into a practical use, the thus hot-rolled A3003 material assumes substantially the fiber structure formed by the rolling treatment and has a predetermined amount of finely divided secondary structure dispersed therein.
  • This A3003 material having the structure as described above exhibits the following effects:
  • the material in carrying out acute-angle bending, if the material has the fiber structure only, cracking or the like can occur at the bend along the grain boundary of the fiber structure.
  • the A3003 material of the present invention contains the finely divided secondary structure, so that such cracking can be prevented from occurring. In other words, the material ensures acute-angle bending.
  • the A3003 material according to the present invention it is controlled so that it contains the recrystallized grain structure in an amount of not more than 20% of the entire structure in terms of area ratio even after the baking finish treatment, and that the rest remains as the fiber structure.
  • loss of proof stress to be caused by the baking finish treatment can be held within 10%.
  • Such attribute can be realized by controlling the hot rolling treatment such that the temperature of the workpiece be in the range of 290 to 340° C. at the end of the treatment.
  • the workpiece comes to have an elongation of about 35%. However, it is substantially of the recrystallized grain structure, which causes rough surface at the bend.
  • the temperature at the beginning of rolling is set to be in the range of 350 to 450° C.
  • a temperature at the beginning of rolling of lower than 350° C. cannot secure a temperature of 290° C. or higher at the end of rolling. This can increase the strength but reduces elongation, causing cracking and the like in bending.
  • Al alloy materials were melted to form ingots thereof respectively (thickness: 500 mm).
  • the materials had the following compositions respectively:
  • Si 0.58 mass %; Fe: 0.68 mass %; Cu: 0.18 mass %; Mn: 1.48 mass %; Mg: 0.02 mass %; Zn: 0.09 mass %; Al and unavoidable impurities: q.s.
  • Si 0.58 mass %; Fe: 0.68 mass %; Cu: 0.20 mass %; Mn: 1.48 mass %; Mg: 1.01 mass %; Zn: 0.23 mass %; Al and unavoidable impurities: q.s.
  • Each ingot was subjected to a soaking treatment at 600° C. for 6 hours in a holding furnace, followed by hot rolling at a temperature at the beginning of rolling of 550° C. and under temperature control such that the temperature at the end of rolling is as shown in Table 1.
  • the resulting product was used as such as a plate material.
  • Each ingot was subjected to a soaking treatment at 600° C. for 6 hours in a holding furnace, followed successively by hot rolling at a temperature at the beginning of rolling of 550° C. and under temperature control such that the temperature at the end of rolling is 310° C. and cold rolling at 80° C.
  • the resulting workpiece was subjected successively to process annealing at a temperature of 360° C. for 3 hours, cold rolling at a temperature of 80° C., and a heat treatment at 230° C. for 3 hours. Then, the thus treated workpiece was used as a plate material.
  • Loss of proof stress (%) after the baking finish treatment was calculated according to the following equation: 100 ⁇ ( ⁇ 0 - ⁇ )/ ⁇ 0 .
  • each plate material was ground to expose the surface of the plate material, and the thus exposed surface was subjected to electropolishing.
  • the polished surface was etched using an HBF 4 solution, followed by polariscopic image data processing to integrate the surface area of the grains of the recrystallized structure. Then, rate (percentage) of the integrated value within a scope (5 mm ⁇ 5 mm) was determined. The results are shown in Table 1.
  • each plate material was bent in two modes, i.e. orthogonal to the rolling direction 4 (in the longitudinal direction of the plate material) as shown in FIG. 6 and parallel to the rolling direction (in the width direction of the plate material) as shown in FIG. 7, to determine bending angles when occurrence of rough surface was observed.
  • each plate material was bent by 90° and 180° parallel to the rolling direction (in the width direction of the plate material) to observe whether or not there occurred cracking.
  • Example 1 A3003 A 290 1.5 146 26.2 180 146 27.1
  • Example 2 A3003 A 290 1.5 146 26.2 260 141 27.6
  • Example 3 A3003 A 290 5.0 142 26.5 260 138 27.4
  • Example 4 A3003 A 300 1.0 137 26.5 260 136 27.2
  • Example 5 A3003 A 310 1.5 125 28.5 200 125 28.9
  • Example 6 A3003 A 310 3.0 124 28.6 200 123 29.1
  • Example 7 A3003 A 310 5.0 123 28.8 200 122 29.1
  • Example 8 A3003 A 310 1.5 125 28.5 260 124 29.0
  • Example 9 A3003 A 310 3.0 124 28.6 260 122 29.5
  • Example 10 A3003 A 310 5.0 123 28.8 260 121 29.8
  • Example 11 A3003 A 310 3.0 124 28.6 300 120 30.0
  • Example 12 A3003 A 330 1.5 114
  • Comparative Example 6 obtained through hot rolling, followed by cold rolling, process annealing, etc., came to have a proof stress lower than 95 N/mm2 after the baking finish treatment, which is lower than that of Example 9 in spite of the same baking finish temperature of 260° C.
  • Comparative Example 6 was more likely to have rough surface than Example 9. This is because the structure of Comparative Example 6 was converted into recrystallized grain structure through a series of steps after the hot rolling and further during the baking finish treatment.
  • Example 9 A fiber structure and a finely divided secondary structure (subgrains) coexist in Example 9 after the baking finish treatment as shown in FIG. 4, and Example 9 showed a high proof stress of 122 N/mm 2 and a high elongation of 29.5% after the baking finish treatment but a very low proof stress loss of 1.6%, thus showing excellent results in the bending test.
  • Comparative Example 8 showed a high proof stress of 160 N/mm 2 after the baking finish treatment, it showed a small elongation of 15.2% and an extremely great % loss of proof stress. As a result, there were obtained significantly bad results in the bending test in terms of rough surface and cracking.
  • the hot rolled A3003 material obtained under control such that the temperature at the end of rolling be in the range of 290 to 340° C. maintained the state that it contains substantially the fiber structure with no growth of recrystallized grain structure even after the baking finish treatment, and it also showed a proof stress loss of 10% or less and also secured an absolute proof stress value of 95 N/mm 2 or more and an elongation of 27% or more. Therefore, the Al alloy material according to the present invention enjoys high industrial value as a building material having excellent bendability and undergoing no loss of proof stress.
  • the architectural Al alloy material according to the present invention can be employed suitably whether the temperature of the baking finish treatment is 260° C. or lower or in the range of 280 to 300° C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Finishing Walls (AREA)
US09/928,134 2000-08-09 2001-08-08 Architectural aluminum alloy material and process for manufacturing the same Abandoned US20020040746A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000-241031 2000-08-09
JP2000241031 2000-08-09
JP2001-224329 2001-07-25
JP2001224329 2001-07-25

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KR (1) KR100490760B1 (zh)
CN (1) CN1197987C (zh)
TW (1) TWI238201B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110135533A1 (en) * 2009-12-03 2011-06-09 Alcan International Limited High strength aluminium alloy extrusion

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6176393B2 (ja) * 2014-04-09 2017-08-09 日本軽金属株式会社 曲げ加工性と形状凍結性に優れた高強度アルミニウム合金板

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JPH06172945A (ja) * 1992-12-07 1994-06-21 Kobe Steel Ltd 高温焼付塗装性に優れた建築用アルミニウム板の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110135533A1 (en) * 2009-12-03 2011-06-09 Alcan International Limited High strength aluminium alloy extrusion
US8313590B2 (en) 2009-12-03 2012-11-20 Rio Tinto Alcan International Limited High strength aluminium alloy extrusion

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CN1197987C (zh) 2005-04-20
KR20020013409A (ko) 2002-02-20
TWI238201B (en) 2005-08-21
KR100490760B1 (ko) 2005-05-19

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Owner name: FURUKAWA ELECTRIC CO., LTD., THE, JAPAN

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