Abstract
In this paper, the influence of smelting processes on precipitation behaviors and mechanical properties of CLF-1 (China low activation ferrite) steel was investigated. Mechanical properties of CLF-1 steels melted by vacuum induction melting (VIM, CS25 steel) and vacuum induction melting followed by consumable electrode remelting (VIM + ESR, CS350 steel) had been studied. The results indicated that the steels showed similar values of hardness and tensile strength, however, creep properties of CLF-1 steel were obviously improved by VIM + ESR process. M 23C 6 and M 7C 3 Carbides were precipitated in the CS25 steel, and M 23C 6 carbides were precipitated in CS350 steel after high-temperature tempering at 1013 K for 90 min. Creep properties of CS25 steel were shown to be dramatically deteriorated by the existence of rod M 7C 3 precipitates, which was due to W macrosegregation in the CS25 steel melted by VIM. M 7C 3 was replaced by M 23C 6 after ageing at 823 K for 5000 h.
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