本规范涵盖标称直径小于等于4.000英寸（101.60 mm）或平行边之间最小距离的棒材形式的钛合金，厚度小于等于4.0000英寸（101.60%）的锻件，棒材和锻件的最大横截面积为32平方英寸（206.5 cm2），以及任何尺寸的锻件坯料（见8.6）。

This specification covers a titanium alloy in the form of bars up through 4.000 inches (101.60 mm) in nominal diameter or least distance between parallel sides, inclusive, forgings of thickness up through 4.000 inches (101.60 mm), inclusive, with bars and forgings having a maximum cross-sectional area of 32 square inches (206.5 cm2), and stock for forging of any size (see8.6).