The action mechanism and application of alloying elements in the pressure vessel steel

The research progress of the influence of alloying elements on the microstructure and mechanical properties of pressure vessel steel was summarized. The effects of different alloying elements on the composite mechanical properties of the pressure vessel, such as the strength and toughness and the low temperature fracture resistance, were analysed. The action mechanism of alloying elements in pressure vessel steel was generalized. Combined with the actual production, the adding alloying elements, the research progress and the development prospect of the nuclear power pressure vessel steel were mainly analysed and discussed. The future research should focus on the mechanism of each component element, clarify the interaction relationship between the alloying elements, and develop a complete set of alloy adding scheme. So that the pressure vessel steel, which not only conforms to the actual situation, but also meet the specific requirements should be produced. (paper)