Preparation of fin material or brazing sheet for heat exchanger

Abstract

Abstract PURPOSE:To prepare a fin material or a brazing sheet for a heat exchanger without generating high temp. deformation during brazing, by applying three times of cold rolling processings containing two times of annealings under a specific condition to a combined material comprising a core material and a skin material both of which are made of Al-alloys having specific compositions. CONSTITUTION:An Al-alloy containing 0.5-2.0% Mn, 0.1-1.0% Si and, if necessary, 0.01-0.2% Zr or an Al-alloy further contaning one or more of 0.2-2.0% Zn, 0.002-0.1% Sn and 0.002-0.1% In is used as a core material and an Al-Si alloy or an Al-Si-Mg alloy is used as a skin material to prepare a combined plate. This combined plate is subjected to hot rolling, cold rolling and intermediate annealing at a temp. from 200 deg.C to a perfect re-crystallizing temp. In the next step, the formed plate is cold rolled under a draft of 5-65% and, thereafter, again annealed at a temp. from a recrystallizing stemp. to 450 deg.C and succeedingly subjected to third cold rolling under a draft of 25-65% to prepare a fin material or a brazing sheet for a heat exchanger.

Inventors

• 👤 Shinji Takeno
• 👤 竹野　親二
• 👤 Kohei Ono
• 👤 耕平 大野

Bibliographic Details