Free ASTM Standards ASTM A53/A53M-20 pdf free download ASTM A53/A53M-20 pdf free download.Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. 1 This specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS ¼ to NPS 26 IDN 6... 07-13-2021 Get More