ALUMINUM ALLOY EXTRUSION MATERIAL HAVING EXCELLENT INTERGRANULAR CORROSION RESISTANCE, APPARATUS AND THERMOSTATIC REFRIGERANT EXPANSION VALVE COMPOSING REFRIGERATION CYCLE USING THE EXTRUSION MATERIAL

摘要

PROBLEM TO BE SOLVED: To obtain an aluminum alloy extrusion material which has excellent intergranular corrosion resistance, and to prevent the leakage of a refrigerant, e.g. in a solenoid valve and a thermostatic refrigerant expansion valve composing a refrigeration cycle.;SOLUTION: The aluminum alloy extrusion material has a composition containing, by mass, 0.2 to 1.5% Si, 0.2 to 1.5% Mg and 0.001 to 0.2% Ti, and further containing 0.1 to 1.0% Mn or 0.1 to 0.5% Zr or Mn and Zr by 0.1 to 1.5% in total (wherein, the Mn content is ≤1.0%, and the Zr content is ≤0.5%), and the balance Al with inevitable impurities, and has a fibrous microstructure with an aspect ratio of ≥10.;COPYRIGHT: (C)2002,JPO