Comparison of hydrogen embrittlement in three pipeline steels in high pressure gaseous hydrogen environments

The tensile properties of X52, X65, and X100 pipeline steels have been measured in a high-pressure (13.8 MPa) hydrogen gas environment. Significant decreases in elongation at failure and reduction of area were observed when testing in hydrogen as compared with air, and those changes were accompanied by noticeable changes in fracture morphology. In addition to baseline characterization of the effects of strength and microstructure on the X52, X65, and X100 alloys, the influence of strain rate and hydrogen gas pressure was studied for only the X100 alloy. Published by Elsevier Ltd.