AECMA PREN 2637-1986 航空航天系列7075-T73对粗晶粒边缘区有控制的挤压棒材和型材a或1,2mm小于或等于直径D小于或等于100 mm
Aerospace Series Aluminium Alloy 7075-T73 Extruded Bar and Section 1,2 Less Than or Equal to (a or D) Less Than or Equal to 100 mm with Coarse Peripheral Grain Control Issue P 1