| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.15 ( October 1986 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Manufacture of Forged Shell Rings for PWR Nuclear Reactor Vessels Kazuo Aso, Naoyuki Abe, Kenji Saito, Kyoji Nakanishi, Akihiko Namba, Minoru Yao |
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Synopsis : A 250 ton hollow ingot was made for an experimental purposes of which internal properties can be simulated to those of large-sized hollow ingots. The investigation results indicated that this ingot had less C segregation and good cleanliness. Forged shell ring, a component of the 1300 MWe PWR type nuclear reactor vessel, was manufactured from large hollow ingot by using 6000 and 4400 t forging presses, large heat treating furnace and large turn miller. Mechanical properties obtained after heat treatment showed good results. Forged shell ring turned out free of defects as the results of UT and MT which were performed by automatic UT and MT equipments. Furthermore, by using solidification simulation techniques, Kawasaki Steel is manufacturing large hollow ingots up to 320 t for forged shell rings. |
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