A554 Standard Specification for Welded Stainless
The grades covered are listed in Table 1. 1.2 This specification covers as-welded or cold-reduced mechanical tubing in sizes to 16 in. (406.4 mm) outside dimension, and in wall thicknesses 0.020 in. (0.51 mm) and over. 1.3 Tubes shall be furnished in one of the following shapes as specified by the purchaser: round, square, rectangular, or special.