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Manufacturing and Properties of Closure Head Forging Integrated With Flange for PWR Reactor Pressure Vessel

[+] Author Affiliations
Komei Suzuki, Yasuhiko Tanaka, Iku Kurihara, Tomoharu Sasaki, Yoichi Koyama

Japan Steel Works, Ltd.

Etsuo Murai

Japan Steel Work, Ltd.

Paper No. PVP2004-3056, pp. 43-50; 8 pages
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Storage Tank Integrity and Materials Evaluation
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4685-7
  • Copyright © 2004 by ASME


Closure head forging (SA508, Gr.3 Cl.1) integrated with flange for PWR reactor pressure vessel has been developed. This is intended to enhance structural integrity of closure head resulted in elimination of ISI, by eliminating weld joint between closure head and flange in the conventional design. Manufacturing procedures have been established so that homogeneity and isotropy of the material properties can be assured in the closure head forging integrated with flange. Acceptance tensile and impact test specimens are taken and tested regarding the closure head forging integrated with flange as very thick and complex forgings. This paper describes the manufacturing technologies and material properties of the closure head forging integrated with flange.

Copyright © 2004 by ASME



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