Abstract
Creep strength property of a full-annealed 0.1C-15Cr-1Mo-3W 0.2V-0.05Nb-0.07N-0.003B steel and the effects of tungsten and cobalt on that have been investigated. Contrary to a tempered martensite microstructure of the conventional ferritic creep resistant steels, microstructure of full-annealed 15Cr steel is mainly ferrite. Increases in creep strength at 923K with increase in tungsten content and addition of cobalt have been obviously observed, especially with a combination of increase in tungsten content and addition of cobalt. Higher Cr content of full-annealed 15Cr steel than those of the conventional ferritic creep resistant steels is desirable for better oxidation resistance. It has been concluded that full-annealed 15Cr ferritic creep resistant steel should be one of the candidate materials for a low emission power plant.
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