本标准规定了铝合金AL-P7009-中的挤压棒和截面的要求，用于航空应用的T74511，a或D <= 125 mm，具有外围粗粒度控制。如果买方在订单上指定了此条件，本标准也可用于提供T74510条件下的材料。在这种情况下，不应使用第97行的指定

This standard specifies the requirements relating to extruded bars and sections in aluminium alloy AL-P7009-, for use in the T74511, a or D <= 125 mm, with peripheral coarse grain conrol, for aerospace applications. This standard may also be used to supply material in the T74510 condition, if the purchaser specifies this condition on the order. In this case the designation of line 97 shall not be used.