Provided is a multi-layered sheet which has undergone heating corresponding to brazing, such as an aluminum-alloy radiator tube, or a multi-layered sheet such as an aluminum-alloy brazing sheet. The multi-layered sheet can have a reduced thickness and has excellent fatigue properties. The multi-laye
Provided is a multi-layered sheet which has undergone heating corresponding to brazing, such as an aluminum-alloy radiator tube, or a multi-layered sheet such as an aluminum-alloy brazing sheet. The multi-layered sheet can have a reduced thickness and has excellent fatigue properties. The multi-layered sheet of aluminum alloys comprises a core layer (2) which has been clad at least with a sacrificial layer (3). This multi-layered sheet is a multi-layered sheet to be subjected to brazing or welding to produce a heat exchanger or is a multi-layered sheet which has undergone heating corresponding to brazing. The core layer (2) comprises a specific 3000-series composition. In this core layer (2), the average density in number of dispersed particles having a specific size has been regulated. As a result, fatigue properties, which govern cracking, can be highly improved.
대표청구항▼
1. A multi-layered sheet of aluminum alloys, comprising: at least a core layer and a sacrificial layer, being clad, to be utilized for a heat exchanger by brazing, the core layer having an aluminum alloy composition comprising:Si: 0.2 to 1.5 mass %;Cu: 0.2 to 1.2 mass %;Mn: 0.2 to 1.4 mass %;Ti: 0.0
1. A multi-layered sheet of aluminum alloys, comprising: at least a core layer and a sacrificial layer, being clad, to be utilized for a heat exchanger by brazing, the core layer having an aluminum alloy composition comprising:Si: 0.2 to 1.5 mass %;Cu: 0.2 to 1.2 mass %;Mn: 0.2 to 1.4 mass %;Ti: 0.03 to 0.3 mass %;Fe: 1.0 mass % or less; anda balance being Al and inevitable impurities, andhaving a microstructure wherein a mean number density of dispersed particles, in which a mean value of centroid diameters observed by a 500-times SEM on a rolling plane of the core layer is 1 μm or more, is 7000 particles/mm2 or less. 2. The multi-layered sheet of aluminum alloys according to claim 1, wherein the core layer further comprises at least one of Cr: 0.03 to 0.3 mass %;Zn: 0.2 to 1.0 mass %; andZr: 0.03 to 0.3 mass %. 3. The multi-layered sheet of aluminum alloys according to claim 1, wherein the core layer further comprises Mg: 0.5 mass % or less. 4. The multi-layered sheet of aluminum alloys according to claim 1, wherein a gage of the core layer is less than 0.25 mm thick. 5. The multi-layered sheet of aluminum alloys according to claim 1, wherein a gage of the multi-layered sheet is less than 0.3 mm thick. 6. A multi-layered sheet of aluminum alloys, comprising: at least a core layer and a sacrificial layer, being clad, to be formed into a heat exchanger by brazing, the core layer having an aluminum alloy composition comprising:Si: 0.2 to 1.5 mass %;Cu: 0.05 to 1.2 mass %;Mn: 0.3 to 1.8 mass %;Ti: 0.03 to 0.3 mass %Fe: 1.0 mass % or less; anda balance being Al and inevitable impurities, andhaving a microstructure wherein a mean number density of precipitates, in which a mean value of centroid diameters observed by a 50000-times TEM on a rolling plane in a central part in thickness of the core layer is within a range of 0.1 to 0.5 μm, is 150 precipitates/μm3 or less. 7. The multi-layered sheet of aluminum alloys according to claim 6, wherein the core layer further comprises at least one of Cr: 0.03 to 0.3 mass %;Zn: 0.2 to 1.0 mass %; andZr: 0.03 to 0.3 mass %. 8. The multi-layered sheet of aluminum alloys according to claim 6, wherein the core layer further comprises Mg: 0.5 mass % or less. 9. The multi-layered sheet of aluminum alloys according to claim 6, wherein a gage of the core layer is less than 0.25 mm thick. 10. The multi-layered sheet of aluminum alloys according to claim 6, wherein a gage of the multi-layered sheet is less than 0.3 mm thick. 11. A multi-layered sheet of aluminum alloys, comprising: at least a core layer and a sacrificial layer, being clad, the core layer having an aluminum alloy composition comprising:Si: 0.2 to 1.5 mass %;Cu: 0.2 to 1.2 mass %;Mn: 0.2 to 1.4 mass %;Ti: 0.03 to 0.3 mass %;Fe: 1.0 mass % or less; anda balance being Al and inevitable impurities,having, as a microstructure after brazing process, a microstructure wherein a mean grain size of a rolling direction in a vertical section parallel with the rolling direction of the core layer is 200 μm or less, and a mean number density of dispersed particles, in which a mean value of centroid diameters observed by a 500-times SEM on a rolling plane of the core layer is 1 μm or more, is 6000 particles/mm2 or less. 12. The multi-layered sheet of aluminum alloys according to claim 11, wherein the core layer further comprises at least one of Cr: 0.03 to 0.3 mass %;Zn: 0.2 to 1.0 mass %; andZr: 0.03 to 0.3 mass %. 13. The multi-layered sheet of aluminum alloys according to claim 11, wherein the core layer further comprises Mg: 0.5 mass % or less. 14. The multi-layered sheet of aluminum alloys according to claim 11, wherein a gage of the core layer is less than 0.25 mm thick. 15. The multi-layered sheet of aluminum alloys according to claim 11, wherein a gage of the multi-layered sheet is less than 0.3 mm thick. 16. A multi-layered sheet of aluminum alloys, comprising: at least a core layer and a sacrificial layer, being clad, the core layer having an aluminum alloy composition comprising:Si: 0.2 to 1.5 mass %;Cu: 0.05 to 1.2 mass %;Mn: 0.3 to 1.8 mass %;Ti: 0.03 to 0.3 mass %;Fe: 1.0 mass % or less; anda balance being Al and inevitable impurities,having, as a microstructure after brazing process, a structure wherein a mean grain size of a rolling direction in a vertical section parallel with the rolling direction of the core layer is 200 μm or less, and a mean number density of precipitates, in which a mean value of centroid diameters observed by a 50000-times TEM on a rolling plane in a central part in thickness of the core layer is within a range of 0.1 to 0.5 μm, is 80 precipitates/μm3 or less. 17. The multi-layered sheet of aluminum alloys according to claim 16, wherein the core layer further comprises at least one of Cr: 0.03 to 0.3 mass %;Zn: 0.2 to 1.0 mass %; andZr: 0.03 to 0.3 mass %. 18. The multi-layered sheet of aluminum alloys according to claim 16, wherein the core layer further comprises Mg: 0.5 mass % or less. 19. The multi-layered sheet of aluminum alloys according to claim 16, wherein a gage of the core layer is less than 0.25 mm thick. 20. The multi-layered sheet of aluminum alloys according to claim 16, wherein a gage of the multi-layered sheet is less than 0.3 mm thick.
Setzer William C. (Creve Coeur MO) Sperry Philip R. (North Haven CT) Winter Joseph (New Haven CT) Graham Douglas L. (Ballwin MO), Composite aluminum brazing sheet.
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