A106 and A53 steel pipe
A53 is usually for defining welded pipe, while A106 for seamless. If you ask for A53, suppliers will also quote A106 or API 5L as an alternate. To speak with a piping expert, please email [email protected]. A106 and A53 steel pipe Scope ASTM A53 is Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.