ASTM A53 is Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.
ASTM A106 is Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service.
Application between ASTM A53 and ASTM A106
A 53 can be welded seam or seamless depending on how it is specificed for purchase. It is a general steel pipe spec and covers galvanized pipe as well as black pipe.
A106 is a similar pipe in chemical composition but is intened for high temperature service (up to 750 Degs F). It is a seamless pipe.
Chemical Composition between ASTM A53 and ASTM A106
|ASTM A53 B||max 1.2%||max 0.05%||max 0.045%|
|ASTM A106 B||0.29-1.06%||max 0.035%||