INTERPHASE-PRECIPITATION-ENHANCED LOW-ACTIVATION FERRITIC STEEL AND PREPARATION METHOD THEREFOR

摘要

Disclosed are a low-activation ferritic steel and a preparation method therefor. The low-activation ferritic steel comprises, by mass percentage: 0.04% to 0.07% of C, 8.5% to 9.5% of Cr, 0.5% to 1.5% of W, 0.15% to 0.25% of V, 0.1% to 0.2% of Si, 0.3% to 0.6% of Mn, and 0.16% to 0.28% of Ti, with the balance being Fe. The method comprises: preparing an alloy material containing the defined mass percentages of C, Cr, W, V, Si, Mn, Ti and Fe; austenitizing the alloy material; subjecting the austenitized alloy material to isothermal ferrite phase transformation; and after the isothermal ferrite phase transformation is completed, cooling same. The low-activation ferritic steel has a good structure stability and high-temperature creep resistance, and is expected to meet requirements of structural materials for the design of a next-generation fusion experimental reactor serving at a high temperature and a high radiation intensity. The preparation method therefor is simple in terms of process and high in operability.