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

Table 3

Chemical composition specification of API 5L PSL1 and PSL2 (wt%).

API 5L	Pipelines	C	Mn	P	S
PSL1-X52	Seamless	0.280	1.400	0.030	0.030
	Welded	0.260	1.400	0.030	0.030
PSL2-X52N	Seamless	0.240	1.400	0.025	0.015
	Welded	0.220	1.400	0.025	0.015