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

Published online by Cambridge University Press:  15 March 2011

Junpei Nakayama  and
Kiyoshi Kiuchi
Junpei Nakayama
Affiliation:
Kobe Steel Limited, Kobe-shi, 657-0845, Japan
Kiyoshi Kiuchi
Affiliation:
Japan Atomic Energy Agency, Tokai-mura, 319-1106, Japan
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Abstract

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 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 sed 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.

Keywords

corrosionweldingchemical composition
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1298: Symposium Q/R/T – Advanced Materials for Applications in Extreme Environments , 2011 , mrsf10-1298-q04-01
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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