HSLA steels are increasingly used in the construction of pipelines due to its excellent mechanical properties, resulting in adjustments to higher line pressures, weight reduction of the tube, and mainly risk decrease of structural failure. However, such pipes, when in offshore operation, can be embrittled by the presence of H2S in the transported fluid. So that, this research aimed to study the influence of hydrogen on the fracture behavior of API 5L X65 steel with and without hydrogen at –30 Celsius Degree, which enabled a comparative analysis of the two conditions. Based on the CTOD and J Integral parameters, it was found that there was no reduction in the toughness of the X65 steel, since the CTOD and J related to the most severe hydrogenation conditions were similar to those found in the reference condition. The degrading effect caused by hydrogen was associated with a higher crack propagation during the toughness tests. This indicates that hydrogen can cause contradictory effects on the fracture behavior of the material. The discrepant effects are related to the type of research undertaken to analyze the mechanical behavior of the material (macroscopic or microscopic), microstructure and experimental variables adopted during the tests, such as strain rate, hydrogen concentration, stress levels.