本规范涵盖标称直径或平行边之间最小距离小于等于4.000英寸（101.60 mm）的棒材形式的钛合金、厚度小于等于4.0000英寸（101.60mm）的锻件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), inclusive, in nominal diameter or least distance between parallel sides, forgings of thickness up through 4.000 inches (101.60 mm), inclusive, and stock for forging of any size (see 8.6).