Abstract
Carburization and decarburization behavior in sodium have been examined for Fe-9Cr-Mo ferritic steels exposure to flowing sodium with containing 0.0049, 0.016 and 0.16 wppm carbon at temperatures between 723 and 873 K. The Fe-9Cr-Mo ferritic steels were more resistant to carbon transfer than 2 ¼ Cr-lMo steel. The carbon transfer and its gradient in Fe-9Cr-Mo ferritic steels was closely related with carbon concentration in sodium, and carburization and decarburization behavior depended on the sodium conditions. In the case of the application of Mod. 9Cr-lMo steel to heat transfer tubes of steam generator of LMFBR, carburization behavior was observed on the conditions that sodium inlet temperature was 778 K and carbon concentration in sodium was 0.01~0.10 wppm. The mean carbon contents of heat transfer tubes after the operation of the steam generator for 200,000 h were estimated to be about 0.103~0.148 wt% comparing with initial carbon contents of 0.10 wt%. Consequently it is expected that high-temperature strength of Mod. 9Cr-lMo steel would retain sufficient strength and ductility for such operating conditions.
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