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In Europe, low activation austenitic stainless steels have been investigated and developed in 2 laboratories, AEA Culham and JRC Ispra. In the JRC the starting points were commercial high manganese steels, which have been developed independently from fusion. These alloys have been produced on a semi-industrial scale in order to test to what extent impurities can be reduced with the existing procedures. In the Culham laboratories, the work started with the substitution of Ni in existing alloys by Mn, Ta, Ti and W. Later, a series of optimised steels called OPSTAB was produced. It is concluded that austenitic stainless steels containing manganese have structural properties equal or superior to AISI 316 in the unirradiated as well as in the irradiated condition. Their activation behaviour is substantially better in the long term. However, they develop higher after-heats immediately after shut-down. Like 316, they swell after an incubation dose at temperatures higher than 420 C. They are certainly usable in low fluence regions of fusion reactors, for example, in the shield.

Additional information

Authors: SCHILLER P, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Workshop on Low Activation Materials, Culham (GB), April 8-12, 1991
Availability: Available from (1) as Paper EN 36218 ORA
Record Number: 199110833 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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