This work addresses an overview of the recent progress, associated risks and development plans of structural materials for in-vessel components (IVCs) in DEMO plants. Reduced Activation Ferritic Martensitic Steels form the primary structural materials for most DEMOs IVCs and will be the focus of the paper.

An overview of EU- and J-DEMO programs RAFM steels developments is presented. We highlight the present status in their development for use in DEMO plants, with a focus on the structural materials’ operational, and project-oriented, requirements. The development of materials property handbooks from high-quality data is illustrated. A process to validate these steels for operation in DEMO IVCs is summarised, revealing the pragmatic procedures ongoing, and limitations of this approach due to the synergistic operational effects on IVC materials; the use of in-situ or surveillance monitoring is outlined as a method to accommodate this limitation in synergistic effects and allow confidence in future DEMO operations.

The development of advanced modifications to F82H and EUROFER are highlighted, with minor modifications leading to improved low and high-temperature operational design space being open for DEMO reactors.

这项工作概述了DEMO工厂中船用部件（IVC）的结构材料的最新进展，相关风险和开发计划。降低活化作用铁素体马氏体钢是大多数DEMO IVC的主要结构材料，将成为本文的重点。

介绍了欧盟和J-DEMO计划RAFM钢的发展概况。我们重点介绍了其在DEMO工厂中使用的开发现状，重点关注结构材料的操作要求和面向项目的要求。说明了从高质量数据中开发材料特性手册的过程。总结了验证这些钢是否可在DEMO IVC中运行的过程，揭示了实际的程序，以及由于对IVC材料的协同运行影响，这种方法的局限性；概述了使用现场监视或监视监视的一种方法，以适应协同效应中的这一限制并允许对将来的DEMO操作充满信心。

着重介绍了对F82H和EUROFER进行高级改进的过程，并进行了较小的改进，从而为DEMO反应堆提供了改进的低温和高温运行设计空间。