A53GrB VS A106GrB

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.

Chemical Composition between ASTM A53GrB steel and ASTM A106GrB steel

Grade	C	Mn	P	S	Cu	Ni	Cr
A53GrB	≤0.30	≤1.20	≤0.05	≤0.045	≤0.40	≤0.40	≤0.40
A106GrB	≤0.30	0.29-1.06	≤0.035	≤0.035	≤0.40	≤0.40	≤0.40

Application between ASTM A53GrB and ASTM A106GrB
A53GrB steel 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.

A106GrB steel is a similar pipe in chemical composition but is intened for high temperature service (up to 750 Degs F). It is a seamless pipe.