Abstract: A process for making aluminum alloy finstock having improved combinations of post-braze tensile strength, electrical conductivity and self-corrosion resistance. The process includes continuously casting into sheet an alloy composition. The composition includes about 0.35-0.50 wt. % Si, about 1.8-2.6 wt. % Fe, about 0.02-0.30 wt. % Cu, about 0.40-0.70 wt. % Mn, up to about 3.0 wt. % Zn, up to about 0.05 wt. % In; up to about 0.05 wt. % Ti and up to about 0.2 wt. % Zr, the balance aluminum, incidental elements and impurities. The casting including a solidification rate of greater than about 200° C./sec. The sheet is then rolled to an intermediate anneal gauge and then annealed. The sheet is then cold rolled to a desired final gauge.

Abstract: A high-conductivity finstock alloy is for brazed aluminum heat exchangers. The finstock comprises an aluminum alloy comprised of between about 0.7-1.2% Si, about 1.9-2.4% Fe, about 0.6-1.0% Mn, up to about 0.5% Mg, up to about 2.5% Zn, up to about 0.10% Ti, and up to about 0.05% In, with the remainder comprising Al and tolerable impurities. A method of manufacturing finstock from the foregoing aluminum alloy comprises continuously casting the alloy as a strip with a thickness of about 2-10 mm at an average cooling rate above about 300° C./sec. and then multiple pass cold rolling the strip using one or more intermediate partial anneals at a temperature of about 300-450° C. A fin made from the foregoing finstock is also disclosed. A brazed aluminum heat exchanger having cooling fins made from the foregoing finstock is also disclosed.

Abstract: A high-strength aluminum alloy tubestock is for heat exchangers. The tubestock includes a core with low to moderate Si content to promote strengthening without excessively compromising corrosion resistance. A braze liner on the core exterior employs a Zn+Mg+Si water-side liner that will not experience undesirable melting during brazing. The water-side liner preferably comprises between about 0.2-0.5% Si, between about 2.5-5.0% Zn, between about 1.3-2.5% Mg, less than about 0.1% Cu, less than about 0.35% Fe and less than about 0.25% Mn, with the remainder comprising Al and tolerable impurities. The core preferably comprises between about 0.5-1.3% Mn, between about 0.1-0.3 Mg, between about 0.4-0.7% Cu, between about 0.15-0.5% Si, between about 0.01-0.25% Ti and less than about 0.5% Fe, with the remainder comprising Al and tolerable impurities. The braze liner preferably comprises an Al—Si-base alloy. A tubular member made from the foregoing tubestock is also disclosed.