There are provided an aluminum-alloy clad sheet and a clad sheet subjected to heating equivalent to brazing, which each have a high strength and an excellent erosion resistance and thus allow a reduction in thickness of a clad sheet subjected to heating equivalent to brazing such as an aluminum allo
There are provided an aluminum-alloy clad sheet and a clad sheet subjected to heating equivalent to brazing, which each have a high strength and an excellent erosion resistance and thus allow a reduction in thickness of a clad sheet subjected to heating equivalent to brazing such as an aluminum alloy radiator tube, and/or of a clad sheet such as an aluminum-alloy brazing sheet. An aluminum-alloy clad sheet or a clad sheet subjected to heating equivalent to brazing includes at least a core aluminum alloy sheet and an aluminum-alloy sacrificial anti-corrosive material cladded with each other, and is to be formed into a heat exchanger by brazing. The core aluminum alloy sheet includes a specified 3000 series composition. Furthermore, the strength and the erosion resistance of the core aluminum alloy sheet are improved through control of grain size distribution of precipitates having a size in a specified level in the core aluminum alloy sheet, or control of the average number density and the composition of dispersed particles therein.
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1. An aluminum-alloy clad sheet to be formed into a heat exchanger by brazing, the aluminum-alloy clad sheet including at least a core aluminum alloy sheet and an aluminum-alloy sacrificial anti-corrosive material cladded with each other, wherein the aluminum-alloy clad sheet has an aluminum alloy c
1. An aluminum-alloy clad sheet to be formed into a heat exchanger by brazing, the aluminum-alloy clad sheet including at least a core aluminum alloy sheet and an aluminum-alloy sacrificial anti-corrosive material cladded with each other, wherein the aluminum-alloy clad sheet has an aluminum alloy composition containing, in percent by mass, 0.5 to 1.8% Mn, 0.2 to 1.5% Si, 0.05 to 1.2% Cu, and 0.03 to 0.3% Ti, containing Fe controlled to be 1.0% or less (including 0%), and containing one or more of 0.02 to 0.4% Cr, 0.02 to 0.4% Zr, and 0.02 to 0.4% Ni, with the remainder including Al and inevitable impurities, andprecipitates each having a circle-equivalent diameter of 100 nm or less, the precipitates being observed by a transmission electron microscope (TEM) at 10,000 power on a rolling plane in the central part in the thickness of the core aluminum alloy sheet, have a grain size distribution wherein average number density of the precipitates within a range of the circle-equivalent diameter of 10 to 100 nm is 30 per cubic micrometer or more,average number density of the precipitates within a range of the circle-equivalent diameter of 10 to 60 nm is 15 per cubic micrometer or more, andaverage number density of the precipitates within a range of the circle-equivalent diameter of 10 to 40 nm is 1.5 per cubic micrometer or more. 2. The core aluminum alloy sheet according to claim 1, wherein the core aluminum alloy sheet of the clad sheet is further controlled in Mg content to be 0.5% or less. 3. The core aluminum alloy sheet according to claim 1 or 2, wherein the core aluminum alloy sheet of the clad sheet has a structure subjected to the heating equivalent to brazing, wherein the core aluminum alloy sheet has an average crystal grain size of 100 to 200 μm in a rolling direction in a longitudinal section along the rolling direction, andprecipitates each having a circle-equivalent diameter of 100 nm or less, the precipitates being observed by TEM at 10,000 power on a rolling plane in the central part in the thickness of the core aluminum alloy sheet, have a grain size distribution whereinaverage number density of the precipitates within a range of the circle-equivalent diameter of 10 to 100 nm is 25 per cubic micrometer or more,average number density of the precipitates within a range of the circle-equivalent diameter of 10 to 60 nm is 10 per cubic micrometer or more, andaverage number density of the precipitates within a range of the circle-equivalent diameter of 10 to 40 nm is 1.2 per cubic micrometer or more. 4. An aluminum-alloy clad sheet to be formed into a heat exchanger by brazing, the aluminum-alloy clad sheet including at least a core aluminum alloy sheet and an aluminum-alloy sacrificial anti-corrosive material cladded with each other, wherein the aluminum-alloy clad sheet has an aluminum alloy composition containing, in percent by mass, 0.5 to 1.8% Mn, 0.4 to 1.5% Si, 0.05 to 1.2% Cu, and 0.03 to 0.3% Ti, containing Fe controlled to be 1.0% or less (including 0%), and containing one or more of 0.02 to 0.4% Cr, 0.02 to 0.4% Zr, and 0.02 to 0.4% Ni, with the remainder including Al and inevitable impurities, andthe average number density of dispersed particles each having a circle-equivalent diameter of 0.5 μm or less is 10 to 25 per cubic micrometer, the dispersed particles being observed on a rolling plane in the central part in the thickness of the core aluminum alloy sheet, andamong the dispersed particles each having the circle-equivalent diameter of 0.5 μm or less, Al—Mn—Si based dispersed particles have an average Mn/Si compositional ratio (in terms of percent by mass) of 2.50 or more, andamong the Al—Mn—Si based dispersed particles each having the circle-equivalent diameter of 0.5 μm or less, Al—Mn—Si based dispersed particles each having a Mn/Si compositional ratio (in terms of percent by mass) of 2.50 or more have a volume fraction a, and Al—Mn—Si based dispersed particles each having a Mn/Si ratio (in terms of percent by mass) of less than 2.50 have a volume fraction b, and a ratio a/b is 0.50 or more. 5. The aluminum-alloy clad sheet according to claim 4, wherein the core aluminum alloy sheet of the clad sheet is further controlled in Mg content to be 0.8% or less (including 0%). 6. The aluminum-alloy clad sheet according to claim 4 or 5, wherein the aluminum-alloy clad sheet preferably has a structure in each of the case where the aluminum-alloy clad sheet is subjected to heating corresponding to brazing, and the case where the aluminum-alloy clad sheet is formed into a heat exchanger by brazing, wherein dispersed particles each having a circle-equivalent diameter of 0.5 μm or less, the dispersed particles being observed in the central part in the thickness of the core aluminum alloy sheet, has an average number density of 5 to 20 per cubic micrometer, andamong the dispersed particles each having the circle-equivalent diameter of 0.5 μm or less, Al—Mn—Si based dispersed particles have an average Mn/Si compositional ratio (in terms of percent by mass) of 2.50 or more, andamong the Al—Mn—Si based dispersed particles each having the circle-equivalent diameter of 0.5 μm or less, Al—Mn—Si based dispersed particles each having a Mn/Si compositional ratio (in terms of percent by mass) of 2.50 or more have a volume fraction a, and Al—Mn—Si based dispersed particles each having a Mn/Si ratio (in terms of percent by mass) of less than 2.50 have a volume fraction b, and a ratio a/b is 0.50 or more. 7. The aluminum-alloy clad sheet according to claim 1 or 4, wherein the core aluminum alloy sheet of the clad sheet further contains 0.2 to 1.0% Zn. 8. The aluminum-alloy clad sheet according to claim 1 or 4, wherein the core aluminum alloy sheet of the clad sheet has a thickness of less than 0.17 mm. 9. The aluminum-alloy clad sheet according to claim 1 or 4, wherein the clad sheet has a thickness of less than 0.2 mm.
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이 특허에 인용된 특허 (4)
Koshigoe, Fumihiro; Ueda, Toshiki; Kimura, Shimpei; Kinefuchi, Masao; Matsumoto, Katsushi; Tamura, Eiichi, Aluminum alloy clad sheet for a heat exchanger and its production method.
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