ALUMINUM-ALLOY BRAZING SHEET FIN MATERIAL FOR HEAT EXCHANGER, AND PRODUCTION PROCESS THEREFOR

• Main Authors: NAKAGAWA, Wataru, TERAYAMA, Kazuko, TANAKA, Satoshi
• Format: Patent
• Language: English; French; German
• Published: 04.04.2018
• Subjects: ALLOYS; BLASTING; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; FERROUS OR NON-FERROUS ALLOYS; HEAT EXCHANGE IN GENERAL; HEATING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WELDING; WORKING BY LASER BEAM

The present invention provides: an aluminum-alloy brazing sheet fi material for heat exchangers which has high strength after heating for brazing and further has satisfactory resistance to high-temperature bucking, brazeability, and resistance to self-corrosion; and a process for producing the brazing sheet fin material. The aluminum-alloy brazing sheet fin material according to the present invention is a fin material that comprises a core material, both surfaces of which have been clad with a brazing material, wherein the core material and the brazing material each have a given aluminum alloy composition. Before heating for brazing, the fin material has an average degree of cladding of 6 to 16% for each surface, a thickness of 40 to 120 µm and an electrical conductivity of 48 to 54% IACS and the core material has a metallographic structure having a distribution in which a Mn-based compound having an equivalent circular diameter of 0.05 to 0.50 µm is present at an average distance between particles of 0.05 to 0.35 µm. After heating for brazing, the fin material has an electrical conductivity of 40 to 44% IACS and the core material has a metallographic structure having a distribution in which a Mn-based compound having an equivalent circular diameter of 0.50 µm or less is present at an average distance between particles of 0.45 µm or less.