A53 grade B steel is also known as A53 Gr B or A53B steel. ASTM A53 grade B steel pipe covers 2 types: Type E - Electric-resistance welded pipe, which is also known as A53B ERW steel pipe; Type S - seamless pipe, also known as A53B SMLS pipe. ASTM A53 grade B steel pipe can be seamless and welded black and hot-dipped galvanized steel pipe. ASTM A53 grade B steel pipe A53B type S seamless pipes shall be made by one or more of the processes: open-hearth, electric-furace, or basic-oxygen.

ASTM A53 grade B steel pipe A53B type S seamless pipes chemical composition:

ASTM A53 grade B steel pipe A53B type S seamless pipes mechanical properties:

The A53 grade B steel pipe is much more popular than A53 grade A steel pipe. However, when A53 type S pipe is required for close coiling or cold bending, A53 grade A seamless pipe does better than A53 grade B steel pipe.

ASTM A53 grade B steel pipe is intended for mechanical and pressure applications. ASTM A53 grade B steel pipe A53B type S seamless pipes are also acceptable for ordinary uses in steam, water, gas, and air lines.