ASTM A53 could be a steel alloy, used as steel or for non aggressive plumbing. The alloy specifications are set by ASTM International, in specification ASTM A53/A53M.
ASTM A53 customary could be a customary set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services. A53 pipe comes in 3 varieties and 2 grades, A53 Type F, that is longwise chamber butt welded or continuous welded (Grade A only), A53 Type E, that is longwise resistance welded (Grades A and B), and A53 sort S, that is seamless pipe, made by hot operating, and probably cold finishing, the steel (Grades A and B). This customary refers to seamless and welded black and hot-dipped galvanized steel pipe.
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