ASTM(American Society for Testing Material) defines and sets standards for A53 and A106 pipe. According to ASTM instructions, ASTM A53 Standard Specification is suitable for pipe, steel, black and hot-dipped, zinc-coated, welded and seamless, and ASTM A106 Standard Specification is suitable for seamless carbon steel pipe for high temperature service.

Obviously, A53 and A106 are applied for different scopes.

Here are two tables about chemical and mechanical properties of A53 pipe & A106 pipe:

Table 1 – ASTM A53

ASTM A53 seamless pipe specification

ASTM A53 seamless pipe specification

Table 2 – ASTM A106

astm a106 seamless pipe