American standard steel pipe, 160size, ASTM A179Seamless pipe

A53 Pipe vs A106 Pipe – (1)Scope 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. A53 Pipe vs A106 Pipe – (2)Applied Type of Pipe 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. At least in the US, there is usually A53 for welded pipe while A106 is seamless. If you ask for A53 in the US they will quote A106 as an alternate. A53 Pipe vs A106 Pipe – (3)Chemical Composition For example when we compare between A106-B and A53-B seamless from chemical composition point of view, we find that : 1. A106-B contains silicon, min. 0.10% where A53-B has zero%, and silicon is the important element for improving the heat resistance criteria. 2. A106-B contains manganese 0.29-1.06%, where A53-B 1.2%. 3. A106-B contains low sulfur and phosphorus, max. 0.035% where A53-B contains 0.05 and 0.045% respectively.