本规范涵盖标称直径或平行边之间最小距离为4.000英寸（101.60 mm）的棒材、线材、锻件、闪光焊环以及锻造或闪光焊环的库存形式的一级商用纯钛。

This specification covers one grade of commercially pure titanium in the form of bars, wire, forgings, flash welded rings, up to 4.000 inches (101.60 mm), inclusive, in nominal diameter or least distance between parallel sides, and stock for forging or flash welded rings.