Aluminum alloy brazing sheet having high-strength and production method therefor

An aluminum alloy brazing sheet having high strength comprising:

• a core alloy;
• an Al—Si-based filler alloy cladded on one side of the core alloy;
• and a sacrificial anode material cladded on the other side of the core alloy,
• wherein the core alloy is composed of an aluminum alloy containing 0.3-1.2% (mass %, the same applies the below) Si, 0.05-0.4% Fe, 0.3-1.2% Cu, 0.3-1.8% Mn, 0.05-0.6% Mg, and containing one or more elements selected from the group consisting of 0.02-0.3% Ti, 0.02-0.3% Zr, 0.02-0.3% Cr and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• wherein the sacrificial anode material is composed of an aluminum alloy containing 2.0-6.0% Zn, the balance Al and unavoidable impurities;
• and
• wherein, after the aluminum alloy brazing sheet is subjected to brazing, the core alloy features a metallic structure in which a density of intermetallic compounds having a grain diameter of at least 0.1 μm is at most ten grains per μm2.

An aluminum alloy brazing sheet having high strength comprising:

• a core alloy;
• an Al—Si-based filler alloy cladded on one side of the core alloy;
• and a sacrificial anode material cladded on the other side of the core alloy,
• wherein the core alloy is composed of an aluminum alloy containing 0.3-1.2% (mass %, the same applies the below) Si, 0.05-0.4% Fe, 0.3-1.2% Cu, 0.3-1.8% Mn, 0.05-0.6% Mg, and containing one or more elements selected from the group consisting of 0.02-0.3% Ti, 0.02-0.3% Zr, 0.02-0.3% Cr and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• wherein the sacrificial anode material is composed of an aluminum alloy containing 2.0-6.0% Zn, and containing one or more elements selected from the group consisting of 0.05-1.0% Si, 0.05-1.8% Mn, 0.02-0.3% Ti and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• and
• wherein, after the aluminum alloy brazing sheet is subjected to brazing, the core alloy features a metallic structure in which a density of intermetallic compounds having a grain diameter of at least 0.1 μm is at most ten grains per μm2.

A method for producing an aluminum alloy brazing sheet having high strength, which method comprises the steps of:

• preparing a core alloy having one side and the other side, the core alloy is composed of an aluminum alloy containing 0.3-1.2% (mass %, the same applies the below) Si, 0.05-0.4% Fe, 0.3-1.2% Cu, 0.3-1.8% Mn, 0.05-0.6% Mg, and containing one or more elements selected from the group consisting of 0.02-0.3% Ti, 0.02-0.3% Zr, 0.02-0.3% Cr and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• cladding an Al—Si-based filler alloy on one side or both sides of the core alloy;
• and
• subjecting the resultant cladded alloy materials to hot rolling such that a beginning temperature of hot rolling ranges from 380 to 480° C., and such that a finishing temperature of hot rolling ranges from 200 to 280° C.,
• wherein, after the aluminum alloy brazing sheet is subjected to brazing, the core alloy features a metallic structure in which a density of intermetallic compounds having a grain diameter of at least 0.1 μm is at most ten grains per μm2.

A method for producing an aluminum alloy brazing sheet having high strength, which method comprises the steps of:

• preparing a core alloy having one side and the other side, the core alloy is composed of an aluminum alloy containing 0.3-1.2% (mass %, the same applies the below) Si, 0.05-0.4% Fe, 0.3-1.2% Cu, 0.3-1.8% Mn, 0.05-0.6% Mg, and containing one or more elements selected from the group consisting of 0.02-0.3% Ti, 0.02-0.3% Zr, 0.02-0.3% Cr and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• cladding an Al—Si-based filler alloy on one side of the core alloy;
• cladding a sacrificial anode material on the other side of the core alloy, the sacrificial anode material is composed of an aluminum alloy containing 2.0-6.0% Zn, the balance Al and unavoidable impurities;
• and
• subjecting the resultant cladded materials to hot rolling such that a beginning temperature of hot rolling ranges from 380 to 480° C., and such that a finishing temperature of hot rolling ranges from 200 to 280° C.,
• wherein, after the aluminum alloy brazing sheet is subjected to brazing, the core alloy features a metallic structure in which a density of intermetallic compounds having a grain diameter of at least 0.1 μm is at most ten grains per μm2.

A method for producing an aluminum alloy brazing sheet having high strength, which method comprises the steps of:

• preparing a core alloy having one side and the other side, the core alloy is composed of an aluminum alloy containing 0.3-1.2% (mass %, the same applies the below) Si, 0.05-0.4% Fe, 0.3-1.2% Cu, 0.3-1.8% Mn, 0.05-0.6% Mg, and containing one or more elements selected from the group consisting of 0.02-0.3% Ti, 0.02-0.3% Zr, 0.02-0.3% Cr and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• cladding an Al—Si-based filler alloy on one side of the core alloy;
• cladding a sacrificial anode material on the other side of the core alloy, the sacrificial anode material is composed of an aluminum alloy containing 2.0-6.0% Zn, and containing one or more elements selected from the group consisting of 0.05-1.0% Si, 0;05-1.8% Mn, 0.02-0.3% Ti and 0.02-0.3% V, the balance of Al and unavoidable impurities;
• and
• subjecting the resultant cladded materials to hot rolling such that a beginning temperature of hot rolling ranges from 380 to 480° C., and such that a finishing temperature of hot rolling ranges from 200 to 280° C.,
• wherein, after the aluminum alloy brazing sheet is subjected to brazing, the core alloy features a metallic structure in which a density of intermetallic compounds having a grain diameter of at least 0.1 μm is at most ten grains per μm2.