Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
THE EFFECTS OF CALUCIUM HYDRIDE ADDITION TO GREY CAST IRON
Takaji KusakawaAtsuhiro Kobayashi
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1956 Volume 42 Issue 4 Pages 338-343

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Abstract

The authors studied the effects of calcium hydride addition to grey cast iron and the following results were obtained:
1) Spheroidal graphite cast iron could be obtained by addition of calucium hydride (CaH2) in excess of 4% to a suitable molten iron (Swedish charcoal pig iron) covered with the flux of fluorspar.
2) When CaH2 and fluspar were added without any other additions, it was difficul to give all spheroidal graphite structure, and always quasi-flake graphite was distributed in it.
3) More spongy blow holes occurred with higher addition of CaH2 and fluospar, but when the spheroidal graphite structures occurred, most of the blow holes disappeared.
4) For suitable iron (Swedish charcoal pig iron), the addition of both 2% CaH2 and Mgalloy was not so effective to decrease the amount of Mg which was necessary to make spheroidal graphite.
5) For the pig iron seemed to be oxidized, when blow holes appeared by addition of CaH2, spheroidalization of graphite might occur by the same amount of additional Mg as to Swedish charcoal pig iron.
6) The effect of desulphurization was observed by addition of the CaH2 spread over the molten iron.

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© The Iron and Steel Institute of Japan
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