Beijing University of Technology

Kunyuan Gao

Hui Huang

Zuoren Nie

Shengping Wen

Rui Shao

Wenxia Ru

A kind of aluminum alloy and corresponding heat treatment process applied to manufacturing aluminum/steel cladding plates which are resistant to high temperature brazing belong to alloy materials technology field. In the aluminum/steel cladding plates, the aluminum part was alloyed with 0.76%&#x2dc;0.78% Si and 0.055&#x2dc;0.10% Er in weight percent and the rest was Al and some unavoidable impurity. The Steel part was 08Al steel. After cladding cold rolling with deformation of 55%&#xb1;2%, the aluminum/steel cladding plates were annealed at 510&#x2dc;535&#xb0; C. for different times. Then simulated brazing process was performed to optimize the range of annealing time and temperature. The so produced Al/St cladding plates could not only effectively solve the low interface strength in Al/St cladding plates, but also meet the mechanical properties which were necessary for further processing of Al/St cladding plates. It was provided a kind of aluminum alloy and corresponding heat treatment process which could effectively solve the low bonding strength under the condition of high temperature brazing because of the existence of brittle Fe&#x2014;Al phases.

Aluminum alloy and corresponding heat treatment process applied to manufacture aluminum/steel cladding plates resistant to high temperature brazing

A heat treatment process of high-Mg Er-containing aluminum alloy cold-rolled plates resistant to intergranular corrosion is disclosed, which belongs to the field of non-ferrous metals. The mass percentage of each component of high-Mg Er-containing aluminum alloy heat-rolled plates is, respectively, 5.8%-6.8% of Mg, 0.4%-0.8% of Mn, 0.15%-0.25% of Er, 0.15%-0.25% of Zr, the unavoidable impurities content being less than 4%, the balance being Al. The alloy hot-rolled plates are cold-rolled until the final cold deformation being 75%-90% after the intermediate annealing; the aluminum alloy cold-rolled plates undergo a stabilization annealing at the annealing temperature of 235&#xb0; C. to 245&#xb0; C. for 3.5-4 hours, and then is cooled in air to room temperature. This process significantly improves the resistance to intergranular corrosion while it does not reduce the strength of the alloy significantly.

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Kunyuan Gao