Research Article

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

Table 2

Terminology and heat treatment conditions of API X52 carbon steel the samples.

TerminologyHeat treatment conditions

Base metal (BM)As received of the industry
Annealed base metal (ABM)Heated at 900°C, cold in the oven
Quenching base metal (QBM)Heated at 900°C, cold in water, ice, and salt
Weld metal (WM)Removed from the welded joint of the pipeline as received