What is the difference between A53 pipeline and A106 pipeline?

　　A53 Pipe vs A106 Pipe - (1) Scope

　　ASTM A53 is standard specification for pipe, steel, black and hot-dipped, galvanized-coated, welded and seamless.

　　ASTM A106 is standard specification for seamless carbon steel tube for high temperature service.

　　A53 Pipe vs A106 Pipe - (2) Type of pipe applied

　　A 53 can be welded seam or seamless, depending on how it is specified for purchase. It is a general steel tube specification and covers galvanized pipe as well as black pipe.

　　A106 is a similar tube in the chemical composition, but is intended for high temperature service (up to 750 Degs F). It is a seamless tube.

　　At least in the US, there is usually A53 for the welded tube while A106 is seamless. If you request A53 in the US, you will cite A106 as a substitute.

　　A53 Pipe vs A106 Pipe - (3) Chemical composition

　　For example, when we compare between A106-B and A53-B without problems from the point of view of chemical composition, we find that:

　　1. A106-B contains silicon, min. 0.10% where A53-B has zero%, and silicon is the important element to improve heat resistance criteria.

　　2. A106-B contains 0.29-1.06% manganese, where A53-B 1.2%.

　　3. A106-B contains low sulfur and phosphorus content, max. 0.035% where A53-B contains 0.05 and 0.045%, respectively.

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