高強度高靱性non-Co12%Cr耐熱鋼の諸性質

概要

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Advanced utility gas turbines are mounted with discs and rotors in Jessop H 53, Fe-0.07C-10.5Cr-6Co-MoWVNbB, whose higher Co costs fabricators dear. In order to develop an economical alternate free from Co, the alloy contents of Ni, Mo and N have been optimized for H 46+B, Fe-0.2C-11.5Cr-0.9Mo-VNbB. The final candidate is BS 809, Fe-0.2C-1Ni-11Cr-1.3Mo-0.2V-0.2Nb-0.02B-0.03N.The less expensive BS 809 than H 53 possesses high strength and ductility equivalent to those of H 53 as follows.1. BS 809 forgings heat-treated to HRC 32 retain 87kgf/mm2 for 0.2% proof stress and 5.3kgf·m/cm2 for Charpy impact value respectively at room temperature.2. The creep rupture life for BS 809 forgings extends to 853h under 40kgf/mm2 at 550°C.
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