| This research studied the hydrogen behavior of three grades of pipeline steel, focusing on a new X100 grade. First the microstructure was investigated, and then various mechanical and environmental tests were performed to determine how the various grades would react when in contact with hydrogen. From the appearance of the microstructure, it was proposed that the X100 would be most susceptible to hydrogen embrittlement. In all cases, the X100 steel had higher hydrogen content, both diffusible and trapped, than the lower grades that were tested. In addition, the X100 had the lowest diffusivity for hydrogen, as would be expected. The hydrogen behavior of the X100 was primarily dependant on the microstructure. Its microstructure had more interfacial area than the other grades, and therefore more locations for hydrogen to migrate during the various testing regimes. |
