AECMA PREN 2640-1985 航空航天系列2017A-T4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150 mm
Aerospace Series Aluminium Alloy 2017A-T4 Extruded Bar and Section 1,2 Less Than or Equal to (a or D) Less Than or Equal to 150 mm with Peripheral Coarse Grain Control Edition 1