Austenitic stainless steel plates for fuel cladding in sodium-cooled fast reactors, manufacturing methods and welding techniques

By combining medium-carbon + manganese-nitrogen alloying with pulsed magnetostrictive oscillation (PMO) technology, the distribution of vanadium nitride particles and oxides in steel is optimized, solving the problems of intergranular corrosion resistance and welding performance of austenitic stainless steel plates used for fuel cladding in sodium-cooled fast reactors under high temperature and high radiation, and achieving high-strength and high-stability welded joints.

CN121737578BActive Publication Date: 2026-07-17ANGANG STEEL CO LTD
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANGANG STEEL CO LTD
Filing Date
2026-03-02
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies struggle to produce austenitic stainless steel plates for sodium-cooled fast reactor fuel cladding that exhibit excellent resistance to intergranular corrosion and comprehensive mechanical properties under high-temperature and high-radiation environments, and their weldability is also poor.

Method used

The chemical composition design adopts medium carbon + manganese nitrogen alloying, combined with pulsed magnetostrictive oscillation (PMO) technology, and controls the size and quantity of vanadium nitride particles in the steel through multi-pass rolling, post-rolling water cooling and solution heat treatment, optimizes the distribution of oxide particles, and adopts TIG welding technology to improve welding performance.

Benefits of technology

The produced austenitic stainless steel plates exhibit excellent resistance to intergranular corrosion and comprehensive mechanical properties at high temperatures. The strength of the welded joints is close to that of the base material, significantly improving the high-temperature stability and safety of the material.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121737578B_ABST
    Figure CN121737578B_ABST
Patent Text Reader

Abstract

This invention proposes an austenitic stainless steel plate for cladding of sodium-cooled fast reactor fuel, its manufacturing process, and its welding method. The steel plate's composition by weight percentage is as follows: C: 0.07%~0.08%, Si: 0.20%~0.30%, Mn: 5.0%~6.0%, P≤0.015%, S≤0.002%, Cr: 12.5%~13.5%, Ni: 12.5%~13.5%, Mo: 2.0%~3.0%, N: 0.15%~0.25%, V: 0.15%~0.25%, Nb: 0.10%~0.15%, B: 0.0015%~0.0025%, with the remainder being Fe and unavoidable impurities. The steel plate's production method includes smelting, heating, rolling, and heat treatment.
Need to check novelty before this filing date? Find Prior Art