High-thermal-stability nitride-reinforced high-hydrogen-permeation-resistance low-activation steel and production method thereof

By introducing nano-nitride reinforcing phases VN and TaN into low-activation steel, the problems of high hydrogen permeability and TiN inclusion hazards in RAFM steel are solved, achieving material stability and safety at high temperatures and meeting the long-term service requirements of nuclear fusion reactors.

CN122256806APending Publication Date: 2026-06-23HEBEI DAHE MATERIAL TECH CO LTD +2
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Patent Information

Application Number
CN202610317345.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-16
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing low-activation ferritic/martensitic steel (RAFM steel) has a high hydrogen isotope permeability in nuclear fusion reactors, which leads to tritium loss and material performance degradation. Furthermore, traditional strengthening methods such as carbide thermal stability or TiN inclusions cause serious damage and are difficult to meet the requirements for long-term service.

Method used

By precisely controlling the N/V/Ta ratio and strengthening it through nano-nitride dispersion, high thermal stability VN and TaN nitrides are formed, avoiding TiN inclusions and forming a fine dispersed phase, thereby improving hydrogen permeation resistance and high-temperature creep resistance.

Benefits of technology

It achieves excellent hydrogen permeation resistance and high-temperature mechanical properties at high temperatures, reduces hydrogen permeation flux, and meets the requirements of nuclear fusion reactors in terms of yield strength and elongation, ensuring the stability and safety of the material.

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Abstract

The invention discloses high-thermal-stability nitride-reinforced high-hydrogen-permeation-resistance low-activation steel and a production method thereof, and belongs to the technical field of nuclear fusion reactor structural materials. The high-thermal-stability nitride-strengthened high-hydrogen-permeation-resistance low-activation steel comprises the following chemical elements in percentage by mass: 0.09 to 0.12 percent of C, 0.2 to 0.3 percent of Si, 0.4 to 0.6 percent of Mn, 8.0 to 8.7 percent of Cr, 0.2 to 0.4 percent of V, 1.0 to 1.5 percent of W, 0.1 to 0.15 percent of Ta, 0.02 to 0.05 percent of N, 0.01 to 0.03 percent of Y, less than or equal to 0.005 percent of Ti and the balance of Fe and inevitable impurities. The production method comprises the working procedures of vacuum induction melting, protective atmosphere electroslag remelting, forging, rolling and heat treatment. According to the invention, excellent high-temperature endurance strength and hydrogen resistance of the low-activation steel are realized, and harsh service environment requirements of the nuclear fusion reactor can be met.
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