25 Hydrogen Effect on Microalloyed Steel Mechanical Properties After Several Tempering Schedules

The principal aim of this work is to present results about the hydrogen effects on a high strength martensitic microalloyed steel plate developed for pipeline construction. The microalloyed steel was subjected to three tempering schedules that impairs their original mechanical properties with apparent no change in their martensitic structure. Then was subjected to hydrogen charging and evaluated by tensile test. The mechanical properties show lowering values in both tensile and yield strength but toughness seems to be only slightly changed possibly due to co-precipitation of complex nanoprecipitates during the tempering schedules with dislocation-hydrogen interactions in the tensile tests.