Research of High Grade HIC-Resistant Pipeline Steel
Carry out research on the processes, structures and properties of the X70 corrosion-resistant pipeline steel and analyze the mechanism of the hydrogen induced cracking. The results show that: the developed steel not only has excellent mechanical properties, but also has good resistance to H2S corrosion. Microstructure of the X70 corrosion-resistant pipeline is mainly the acicular ferrite and granular bainite, with well-closed formation and fine grains. Hydrogen Induced Cracking (HIC) begins with the appearance of the hydrogen blistering on the specimen surface, and cracks generated by the hydrogen blistering gradually extend inward from the surface along the grain boundary, diffuse inside the specimen gradually, and finally form hydrogen induced cracking.
Seung-Bok Choi and Yun-Hae Kim
X. H. Gao et al., "Research of High Grade HIC-Resistant Pipeline Steel", Advanced Materials Research, Vol. 900, pp. 730-733, 2014