Spheroidal Graphite Cast Iron (Report Ⅱ)

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Other Title
  • 球狀黑鉛鑄鉄の研究（第Ⅱ報）
  • 球状黒鉛鋳鉄の研究(2)-化学成分(燐)の影響-
  • キュウジョウ コクエン チュウテツ ノ ケンキュウ 2 カガク セイブン リン ノ エイキョウ
  • —The influence of phosphorus contents —
  • —化学成分（燐）の影響—

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  The influence of phosphorus contents on the structure of spheroidal graphite cast iron shall be announced in this report.</br>  Synthesizing the influence, the followings can be said :</br> 1) Up to 2 per cent of the phosphorus content, phosphorus is nothing to do with presipitation of spheroidal graphite.</br>  When the phosphorus content is over this value, the form of graphite becomes almost spheroidal lump with uneven externals.</br>  But it gives no harm when the content is in the limit of practical usage.</br> 2) When phosphorus is added to high carbon and high silicon cast iron with over 2 per cent, lump graphite appears in the structure with no magnesium addition.</br> 3) There are a little difference between ordinary grey cast iron and spheroidal graphite cast iron in the amount and the distribution of steadite under the same pouring temperature and the cooling rate.</br> 4) When spheroidal graphite cast iron contains more than 0.4 per cent phosphorus, carbide-like band structure appears in steadite.</br>  The cast iron with this structure seems to have considerably good wear-resistance-property.</br> 5) With pearlite spheroidal graphite cast iron containing up to 1 per cent phosphorus content, hardness increase can not be observed as the increasing percentages of phosphorus.

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