Mechanical Properties of an As-Cast Heavy-Sectioned Ferritic Spheroidal Graphite Cast Iron

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  • 鋳放し厚肉フェライト球状黒鉛鋳鉄の機械的性質
  • イバナシ アツニク フェライト キュウジョウ コクエン チュウテツ ノ キカイ

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Abstract

  In the production of heavy-sectioned ferritic spheroidal graphite iron castings for such parts as spent fuel shipping container (cask), undesirable structures like abnormal graphite lamella, pearlite or so-called chinese script type of inclusions tend to appear, deteriorating the mechanical properties at the central part of the section where molten iron freezes last. 500mm thick cylindrical vessels with bottom, weighing 18tons and 33tons, were poured as trial products of casks. Solidification structure and mechanical properties were examined at many portions of the castings. By controlling chemical composition, solidification time and inoculation process the structure and the mechanical properties in the last portion of the section to solidify were improved. Sufficiently homogeneous heavy-sectioned ferritic spheroidal graphite iron castings were successfully produced in the as-cast state. In addition, quality assurance process by using test pieces taken from the casting was proposed to establish the quality reliability of such heavy castings.

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