Evaluation of the Influence of Structural Parameters on the Long-Term Strength Characteristics of High-Nickel Steel for the Vessels of Promising VVER-Type Reactors

This article presents the results of comparative structural studies of steel with increased nickel content intended for the reactor pressure vessel with supercritical coolant parameters (T ≥ 400°C, pressure ≥25 MPa) after long-term strength tests. Structural factors in samples from various melts that affect their long-term strength characteristics are identified. Recommendations are formulated to improve the stress rupture characteristics of high-nickel pressure vessel steel.