EFFECT OF HYDROGEN ON MECHANICAL BEHAVIOR FOR 21/4Cr1Mo STEEL GRADES (STANDARD AND VANADIUM ADDED)

摘要

Standard and Vanadium enhanced 2.25Cr1Mo plate steels (ASTM A387 gr. 22 and A542 type D) are generally used in high-temperature and high-pressure hydrogen environments. In such environments, significant quantities of hydrogen are soluble in the steel. The influence of hydrogen on mechanical properties during a shut-down operation and on creep properties has been considered.Mechanical property testing of steels exposed to the above stated environments was conducted in order to determine the effect of hydrogen. Tensile, Charpy V-Notch CVN, and fracture toughness values were determined after exposure to high pressure hydrogen at high temperatures, for base metal, heat-affected zone (HAZ), and weld metal specimens.