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Developments of Extra-High Purity Stainless Steels for Nuclear Corrosive Environments

机译：用于核腐蚀环境的超高纯不锈钢的发展

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The austenitic stainless steels so-called, the EHP steels with the extra high purity, are developed for improving the reliability of nuclear equipments materials used in the heavily corrosive irradiation environments. By considering the impurities segregation mechanism, the major impurities included in the EHP steels is controlled less than 100ppm by the new melting technology. It is a two-step refining process composed of CCIM and EB for effectively removing both non-volatile and volatile harmful elements. The risk to cracking on melting and welding processes is also effectively minimized by enhancing both the eutectic point and the metallic bonding at grain-boundaries. In the EHP steels, it is possible to select the appropriate composition of Ni and Cr for stabilizing austenitic phase and enhancing corrosion resistance. The characteristics of the welding joints are as good as those of the base metal because the same filler metal is used without the formation of residual delta ferrite. The resistance to IGC and SCC of the EHP steels is markedly improved by minimizing the refining effects, except for type 316 steels with Mo. The welding technique and the chemical composition range are selected for standardizing the EHP.
机译：开发奥氏体不锈钢，即所谓的具有极高纯度的EHP钢，是为了提高在强腐蚀性辐射环境中使用的核设备材料的可靠性。考虑到杂质的偏析机理，通过新的熔融技术将EHP钢中的主要杂质控制在100ppm以下。这是由CCIM和EB组成的两步​​精制过程，可有效去除非挥发性和挥发性有害元素。通过提高共晶点和晶界处的金属结合力，还可以有效地降低熔化和焊接过程中产生裂纹的风险。在EHP钢中，可以选择合适的Ni和Cr成分来稳定奥氏体相并提高耐蚀性。焊接接头的特性与母材的特性一样好，因为使用相同的填充金属而不会形成残留的δ铁素体。通过最小化精炼效果，EHP钢对IGC和SCC的耐受性得到了显着提高，除了316 Mo型钢外，还选择了焊接技术和化学成分范围来标准化EHP。

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