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Scope between ASTM A53 and ASTM A106
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
| Standard | Mn | S | P |
| ASTM A53 B | max 1.2% | max 0.05% | max 0.045% |
| ASTM A106 B | 0.29-1.06% | max 0.035% | max 0.035% |