Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Table 1

Chemical analysis of the base metal (BM) and the weld metal (WM) API X52 carbon steel.

Material	Components (wt%)
	C	Si	Mn	P	S	Cr	Ni	Mo	V	Cu
BM	0.28	0.33	1.11	0.03	0.02	0.05	0.02	0.01	0.001	0.02
WM	0.16	0.20	0.47	0.03	0.03	0.03	0.02	0.15	0.002	0.02