Effect of Pipe Forming on Hydrogen Permeation Behavior of Linepipe Steel in Sour Environment

摘要

The effect of the pipe forming on the hydrogen permeation of thelinepipe steel was investigated in aqueous sour environment withrespect to the steel thickness and the circumferential position of thesteel pipe. The hydrogen permeation data shows well the effects of thestrain level and of the inclusion distribution. The HIC susceptibilityincreases as the ratio of the thickness (t) and pipe diameter (D) isincreased since the level of strain is increased. The thickness of steelpipe affects not only the t/D ratio but also the size and distribution ofthe inclusion in the steel. Between the 12 mm and 18 mm thick steelpipes, the HIC susceptibility is the highest at 180° position of the steelpipe manufactured from the thicker one.