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This specification covers sheet steel for corrugated steel pipe, which is coated with a 55 percent aluminum-zinc alloy on continuous lines by the hot-dip process. The material is furnished in coils, flat cut lengths, and corrugated cut lengths. The standard corrugations available in cut lengths (pitch by depth) are 68 by 13 mm, 75 by 25 mm, and 125 by 25 mm. Aluminum-zinc alloy coated steel sheet for corrugated pipe is produced in one coating mass only, designated as 210 g/m2 .