AASHTO M 218-03 (2020) covers steel sheet used in the manufacture of corrugated steel pipe (CSP) for storm sewers, culverts, drains, and similar uses. The sheet is zinc-coated (galvanized) by the hot-dip process, and is produced in two coating weights, 610 g/m 2 and 1220 g/m 2 . Material for this use is furnished in coils, flat in cut lengths, and corrugated in cut lengths.