Alloy material for nuclear reactor equipment and flow path member using said alloy material

The Cr-Ni alloy material, with its specific composition and microstructure, addresses the wear and corrosion challenges of Co-based alloys in nuclear reactor equipment, providing equivalent corrosion resistance, improved high-temperature performance, and reduced costs while eliminating radiation risks.

JP7648553B2Active Publication Date: 2025-03-18HITACHI LTD
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Patent Information

Application Number
JP2022014107
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-02-01
Publication Date
2025-03-18
Estimated Expiration
2042-02-01

AI Technical Summary

Technical Problem

Conventional Co-based alloy materials used in nuclear reactor equipment suffer from wear issues, leading to Co component contamination in fluids, activation into Co-60, and radiation exposure risks. Additionally, these materials exhibit significant deterioration in wear and corrosion resistance at high temperatures, and are costly.

Method used

A Cr-Ni alloy material with a chromium content of 40% to 65% by mass, nickel content of 15% to 40% by mass, and vanadium content of 1% to 8% by mass, which forms a two-phase structure of ferrite and austenite phases with dispersed V-carbide phases. This alloy is used to create a wear-resistant alloy coating layer for flow path members, reducing material costs and avoiding Co component issues.

Benefits of technology

The Cr-Ni alloy material provides corrosion resistance equivalent to or greater than conventional Co-based alloys, maintains wear resistance at high temperatures, and offers significant cost reductions, while eliminating the risk of Co-60 activation and radiation exposure.

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Abstract

To provide a wear-resistant alloy material that is free of Co component but has corrosion resistance equal to or better than that of the conventional Co-based alloy material, and also can be produced at lower cost than the conventional Co-based alloy material, and a channel member including the alloy material.SOLUTION: An alloy material for nuclear reactor equipment according to the present invention has an alloy composition consisting of, in mass%, more than 40% to 65% or less of Cr, more than 15% to 40% or less of Ni, more than 0% to 30% or less of Fe, 1% or more and 8% or less of V, 0.25% or more and 2% or less of C, with the balance being unavoidable impurities. Its matrix has a duplex structure consisting of a ferrite phase and an austenite phase. In the region of the austenite phase, a V carbide phase is dispersed and deposited.SELECTED DRAWING: Figure 1
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