| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.2 ( March 1981 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Manufacture of Forgings for Nuclear Pressure Vessel
Hiroshige Wanaka, Kazuo Asoh, Katsuhiko Miyata, Tatsuhiko Kato, Toru Saito, Akira Horiuchi, Susumu Matsui, Shingo Sato, Michihiro Tanaka |
| Synopsis : Experimental manufacture has been performed of a top head flange and a monoblock bottom head dome for the BWR 800-MWe class nuclear pressure vessel. The top head flange was forged from a 165 t ingot made from a two-heat-mixture of BOG-LRF and BOF-EF-LRF melts. The bottom head dome was forged from a 115 t ingot by the BOF-LRF process and was press-formed using a spherical upper mold and a ring-shaped lower mold. Deformation of the bottom head dome was performed very uniformly and no scale defects occurred during forming. In spite of the largeness of the ingot used, both products showed uniform distributions of chemical composition and mechanical properties, thus suggesting their suitable application for a nuclear pressure vessel. Examinations have revealed the high quality of these forgings in relation to internal qualities, tensile properties, fracture toughness, fatigue properties and others. |
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