CORE MATERIAL FOR ALUMINUM CLAD THIN SHEET OF HEAT EXCHANGER

摘要

PURPOSE: A core material for an aluminum clad thin sheet of a heat exchanger is provided to effectively increase the formability and adhesion characteristics of the aluminum clad thin sheet. CONSTITUTION: A core material for an aluminum clad thin sheet of a heat exchanger is manufactured by adding one of Ti, Zr, V, and Cr to an Al-Mn based 3xxx alloy. An amount of added elements is added more than a liquidus at a pertitectic temperature of the elements and less than the liquidus at a molten metal maintaining temperature after injection. In case Ti, the added amount is more than 0.1-0.15% and less than 0.4% at the pertitectic temperature. [Reference numerals] (AA) Surface integral rate (%); (BB) Crystal grain size (μm)