Three-stage blazed plate fin core model of ultra fine off-set fin,- (thickness x height X pitch X off-set pitch = 0.2 mm X 1.2 mm X 1.6 mm X 5 mm) blazed by Ni blazing material of the recuperator for 600 MW High Temperature Gas Cooled Reactor Gas Turbine (GTHTR300) system was fabricated and tested on its high temperature mechanical properties. The following results were derived. (1) High temperature static, fatigue and creep mode of fracture mainly occurred at ultra fine off-set fin made of SUS304. (2) Tested model showed almost the same high temperature strength, fatigue and creep behaviors of SUS304 as a main structural material at elevated temperatures up to 873 K, (3) Recuperator designed for the GTHTR300 could be testified on the database of SUS304 base material and (4) The recuperator with the same fin plate structure could be practically applied to the GTHTR300.
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